This function accepts a string containing a CSS or basic XPath selector which is then used to match a set of elements. The core functionality of jQuery centers around this function. Everything in jQuery is based upon this, or uses this in some way. The most basic use of this function is to pass in an expression (usually consisting of CSS or XPath), which then finds all matching elements. By default, $() looks for DOM elements within the context of the current HTML document.
expr: String: An expression to search with
context: Element|jQuery: (optional) A DOM Element, Document or jQuery to use as context
jQuery
Finds all p elements that are children of a div element.
$("div > p")
<p>one</p> <div><p>two</p></div> <p>three</p>
[ <p>two</p> ]
Searches for all inputs of type radio within the first form in the document
$("input:radio", document.forms[0])
This finds all div elements within the specified XML document.
$("div", xml.responseXML)
$(Element)
$(Element<Array>)
Create DOM elements on-the-fly from the provided String of raw HTML.
html: String: A string of HTML to create on the fly.
jQuery
Creates a div element (and all of its contents) dynamically, and appends it to the element with the ID of body. Internally, an element is created and it's innerHTML property set to the given markup. It is therefore both quite flexible and limited.
$("<div><p>Hello</p></div>").appendTo("#body")
Wrap jQuery functionality around a single or multiple DOM Element(s). This function also accepts XML Documents and Window objects as valid arguments (even though they are not DOM Elements).
elems: Element|Array<Element>: DOM element(s) to be encapsulated by a jQuery object.
jQuery
Same as $("div > p") because the document
$(document).find("div > p")
<p>one</p> <div><p>two</p></div> <p>three</p>
[ <p>two</p> ]
Sets the background color of the page to black.
$(document.body).background( "black" );
Hides all the input elements within a form
$( myForm.elements ).hide()
A shorthand for $(document).ready(), allowing you to bind a function to be executed when the DOM document has finished loading. This function behaves just like $(document).ready(), in that it should be used to wrap all of the other $() operations on your page. While this function is, technically, chainable - there really isn't much use for chaining against it. You can have as many $(document).ready events on your page as you like. See ready(Function) for details about the ready event.
fn: Function: The function to execute when the DOM is ready.
jQuery
Executes the function when the DOM is ready to be used.
$(function(){ // Document is ready });
A means of creating a cloned copy of a jQuery object. This function copies the set of matched elements from one jQuery object and creates another, new, jQuery object containing the same elements.
obj: jQuery: The jQuery object to be cloned.
jQuery
Locates all p elements with all div elements, without disrupting the original jQuery object contained in 'div' (as would normally be the case if a simple div.find("p") was done).
var div = $("div"); $( div ).find("p");
The current version of jQuery.
String
The number of elements currently matched.
Number
$("img").length;
<img src="test1.jpg"/> <img src="test2.jpg"/>
2
The number of elements currently matched.
Number
$("img").size();
<img src="test1.jpg"/> <img src="test2.jpg"/>
2
Access all matched elements. This serves as a backwards-compatible way of accessing all matched elements (other than the jQuery object itself, which is, in fact, an array of elements).
Array<Element>
Selects all images in the document and returns the DOM Elements as an Array
$("img").get();
<img src="test1.jpg"/> <img src="test2.jpg"/>
[ <img src="test1.jpg"/> <img src="test2.jpg"/> ]
Access a single matched element. num is used to access the Nth element matched.
num: Number: Access the element in the Nth position.
Element
Selects all images in the document and returns the first one
$("img").get(0);
<img src="test1.jpg"/> <img src="test2.jpg"/>
[ <img src="test1.jpg"/> ]
Set the jQuery object to an array of elements, while maintaining the stack.
elems: Elements: An array of elements
jQuery
$("img").set([ document.body ]);
$("img").set() == [ document.body ]
Set the jQuery object to an array of elements. This operation is completely destructive - be sure to use .set() if you wish to maintain the jQuery stack.
elems: Elements: An array of elements
jQuery
$("img").setArray([ document.body ]);
$("img").setArray() == [ document.body ]
Execute a function within the context of every matched element. This means that every time the passed-in function is executed (which is once for every element matched) the 'this' keyword points to the specific element. Additionally, the function, when executed, is passed a single argument representing the position of the element in the matched set.
fn: Function: A function to execute
jQuery
Iterates over two images and sets their src property
$("img").each(function(i){ this.src = "test" + i + ".jpg"; });
<img/><img/>
<img src="test0.jpg"/><img src="test1.jpg"/>
Searches every matched element for the object and returns the index of the element, if found, starting with zero. Returns -1 if the object wasn't found.
subject: Element: Object to search for
Number
Returns the index for the element with ID foobar
$("*").index( $('#foobar')[0] )
<div id="foobar"></div><b></b><span id="foo"></span>
0
Returns the index for the element with ID foo
$("*").index( $('#foo'))
<div id="foobar"></div><b></b><span id="foo"></span>
2
Returns -1, as there is no element with ID bar
$("*").index( $('#bar'))
<div id="foobar"></div><b></b><span id="foo"></span>
-1
args: Array:
table: Boolean: Insert TBODY in TABLEs if one is not found.
dir: Number: If dir<0, process args in reverse order.
fn: Function: The function doing the DOM manipulation.
jQuery
Extends the jQuery object itself. Can be used to add functions into the jQuery namespace and to add plugin methods (plugins).
prop: Object: The object that will be merged into the jQuery object
Object
Adds two plugin methods.
jQuery.fn.extend({ check: function() { return this.each(function() { this.checked = true; }); }, uncheck: function() { return this.each(function() { this.checked = false; }); } }); $("input[@type=checkbox]").check(); $("input[@type=radio]").uncheck();
Adds two functions into the jQuery namespace
jQuery.extend({ min: function(a, b) { return a < b ? a : b; }, max: function(a, b) { return a > b ? a : b; } });
Run this function to give control of the $ variable back to whichever library first implemented it. This helps to make sure that jQuery doesn't conflict with the $ object of other libraries. By using this function, you will only be able to access jQuery using the 'jQuery' variable. For example, where you used to do $("div p"), you now must do jQuery("div p").
undefined
Maps the original object that was referenced by $ back to $
jQuery.noConflict(); // Do something with jQuery jQuery("div p").hide(); // Do something with another library's $() $("content").style.display = 'none';
Reverts the $ alias and then creates and executes a function to provide the $ as a jQuery alias inside the functions scope. Inside the function the original $ object is not available. This works well for most plugins that don't rely on any other library.
jQuery.noConflict(); (function($) { $(function() { // more code using $ as alias to jQuery }); })(jQuery); // other code using $ as an alias to the other library
Reduce the set of matched elements to a single element. The position of the element in the set of matched elements starts at 0 and goes to length - 1.
pos: Number: The index of the element that you wish to limit to.
jQuery
$("p").eq(1)
<p>This is just a test.</p><p>So is this</p>
[ <p>So is this</p> ]
Reduce the set of matched elements to all elements before a given position. The position of the element in the set of matched elements starts at 0 and goes to length - 1.
pos: Number: Reduce the set to all elements below this position.
jQuery
$("p").lt(1)
<p>This is just a test.</p><p>So is this</p>
[ <p>This is just a test.</p> ]
Reduce the set of matched elements to all elements after a given position. The position of the element in the set of matched elements starts at 0 and goes to length - 1.
pos: Number: Reduce the set to all elements after this position.
jQuery
$("p").gt(0)
<p>This is just a test.</p><p>So is this</p>
[ <p>So is this</p> ]
Array<Element>
Access a property on the first matched element. This method makes it easy to retrieve a property value from the first matched element.
name: String: The name of the property to access.
Object
Returns the src attribute from the first image in the document.
$("img").attr("src");
<img src="test.jpg"/>
test.jpg
Set a key/value object as properties to all matched elements. This serves as the best way to set a large number of properties on all matched elements.
properties: Map: Key/value pairs to set as object properties.
jQuery
Sets src and alt attributes to all images.
$("img").attr({ src: "test.jpg", alt: "Test Image" });
<img/>
<img src="test.jpg" alt="Test Image"/>
Set a single property to a value, on all matched elements. Can compute values provided as ${formula}, see second example. Note that you can't set the name property of input elements in IE. Use $(html) or .append(html) or .html(html) to create elements on the fly including the name property.
key: String: The name of the property to set.
value: Object: The value to set the property to.
jQuery
Sets src attribute to all images.
$("img").attr("src","test.jpg");
<img/>
<img src="test.jpg"/>
Sets title attribute from src attribute, a shortcut for attr(String,Function)
$("img").attr("title", "${this.src}");
<img src="test.jpg" />
<img src="test.jpg" title="test.jpg" />
Set a single property to a computed value, on all matched elements. Instead of a value, a function is provided, that computes the value.
key: String: The name of the property to set.
value: Function: A function returning the value to set.
jQuery
Sets title attribute from src attribute.
$("img").attr("title", function() { return this.src });
<img src="test.jpg" />
<img src="test.jpg" title="test.jpg" />
Get the text contents of all matched elements. The result is a string that contains the combined text contents of all matched elements. This method works on both HTML and XML documents.
String
Gets the concatenated text of all paragraphs
$("p").text();
<p><b>Test</b> Paragraph.</p><p>Paraparagraph</p>
Test Paragraph.Paraparagraph
Set the text contents of all matched elements. This has the same effect as html().
val: String: The text value to set the contents of the element to.
String
Sets the text of all paragraphs.
$("p").text("Some new text.");
<p>Test Paragraph.</p>
<p>Some new text.</p>
Get the current value of the first matched element.
String
$("input").val();
<input type="text" value="some text"/>
"some text"
Set the value of every matched element.
val: String: Set the property to the specified value.
jQuery
$("input").val("test");
<input type="text" value="some text"/>
<input type="text" value="test"/>
Get the html contents of the first matched element. This property is not available on XML documents.
String
$("div").html();
<div><input/></div>
<input/>
Set the html contents of every matched element. This property is not available on XML documents.
val: String: Set the html contents to the specified value.
jQuery
$("div").html("<b>new stuff</b>");
<div><input/></div>
<div><b>new stuff</b></div>
Remove an attribute from each of the matched elements.
name: String: The name of the attribute to remove.
jQuery
$("input").removeAttr("disabled")
<input disabled="disabled"/>
<input/>
Adds the specified class to each of the set of matched elements.
class: String: A CSS class to add to the elements
jQuery
$("p").addClass("selected")
<p>Hello</p>
[ <p class="selected">Hello</p> ]
Removes all or the specified class from the set of matched elements.
class: String: (optional) A CSS class to remove from the elements
jQuery
$("p").removeClass()
<p class="selected">Hello</p>
[ <p>Hello</p> ]
$("p").removeClass("selected")
<p class="selected first">Hello</p>
[ <p class="first">Hello</p> ]
Adds the specified class if it is not present, removes it if it is present.
class: String: A CSS class with which to toggle the elements
jQuery
$("p").toggleClass("selected")
<p>Hello</p><p class="selected">Hello Again</p>
[ <p class="selected">Hello</p>, <p>Hello Again</p> ]
Wrap all matched elements with a structure of other elements. This wrapping process is most useful for injecting additional stucture into a document, without ruining the original semantic qualities of a document. This works by going through the first element provided (which is generated, on the fly, from the provided HTML) and finds the deepest ancestor element within its structure - it is that element that will en-wrap everything else. This does not work with elements that contain text. Any necessary text must be added after the wrapping is done.
html: String: A string of HTML, that will be created on the fly and wrapped around the target.
jQuery
$("p").wrap("<div class='wrap'></div>");
<p>Test Paragraph.</p>
<div class='wrap'><p>Test Paragraph.</p></div>
Wrap all matched elements with a structure of other elements. This wrapping process is most useful for injecting additional stucture into a document, without ruining the original semantic qualities of a document. This works by going through the first element provided and finding the deepest ancestor element within its structure - it is that element that will en-wrap everything else. This does not work with elements that contain text. Any necessary text must be added after the wrapping is done.
elem: Element: A DOM element that will be wrapped around the target.
jQuery
$("p").wrap( document.getElementById('content') );
<p>Test Paragraph.</p><div id="content"></div>
<div id="content"><p>Test Paragraph.</p></div>
Append content to the inside of every matched element. This operation is similar to doing an appendChild to all the specified elements, adding them into the document.
content: <Content>: Content to append to the target
jQuery
Appends some HTML to all paragraphs.
$("p").append("<b>Hello</b>");
<p>I would like to say: </p>
<p>I would like to say: <b>Hello</b></p>
Appends an Element to all paragraphs.
$("p").append( $("#foo")[0] );
<p>I would like to say: </p><b id="foo">Hello</b>
<p>I would like to say: <b id="foo">Hello</b></p>
Appends a jQuery object (similar to an Array of DOM Elements) to all paragraphs.
$("p").append( $("b") );
<p>I would like to say: </p><b>Hello</b>
<p>I would like to say: <b>Hello</b></p>
prepend(<Content>)
before(<Content>)
after(<Content>)
Prepend content to the inside of every matched element. This operation is the best way to insert elements inside, at the beginning, of all matched elements.
content: <Content>: Content to prepend to the target.
jQuery
Prepends some HTML to all paragraphs.
$("p").prepend("<b>Hello</b>");
<p>I would like to say: </p>
<p><b>Hello</b>I would like to say: </p>
Prepends an Element to all paragraphs.
$("p").prepend( $("#foo")[0] );
<p>I would like to say: </p><b id="foo">Hello</b>
<p><b id="foo">Hello</b>I would like to say: </p>
Prepends a jQuery object (similar to an Array of DOM Elements) to all paragraphs.
$("p").prepend( $("b") );
<p>I would like to say: </p><b>Hello</b>
<p><b>Hello</b>I would like to say: </p>
append(<Content>)
before(<Content>)
after(<Content>)
Insert content before each of the matched elements.
content: <Content>: Content to insert before each target.
jQuery
Inserts some HTML before all paragraphs.
$("p").before("<b>Hello</b>");
<p>I would like to say: </p>
<b>Hello</b><p>I would like to say: </p>
Inserts an Element before all paragraphs.
$("p").before( $("#foo")[0] );
<p>I would like to say: </p><b id="foo">Hello</b>
<b id="foo">Hello</b><p>I would like to say: </p>
Inserts a jQuery object (similar to an Array of DOM Elements) before all paragraphs.
$("p").before( $("b") );
<p>I would like to say: </p><b>Hello</b>
<b>Hello</b><p>I would like to say: </p>
append(<Content>)
prepend(<Content>)
after(<Content>)
Insert content after each of the matched elements.
content: <Content>: Content to insert after each target.
jQuery
Inserts some HTML after all paragraphs.
$("p").after("<b>Hello</b>");
<p>I would like to say: </p>
<p>I would like to say: </p><b>Hello</b>
Inserts an Element after all paragraphs.
$("p").after( $("#foo")[0] );
<b id="foo">Hello</b><p>I would like to say: </p>
<p>I would like to say: </p><b id="foo">Hello</b>
Inserts a jQuery object (similar to an Array of DOM Elements) after all paragraphs.
$("p").after( $("b") );
<b>Hello</b><p>I would like to say: </p>
<p>I would like to say: </p><b>Hello</b>
append(<Content>)
prepend(<Content>)
before(<Content>)
Clone matched DOM Elements and select the clones. This is useful for moving copies of the elements to another location in the DOM.
jQuery
Clones all b elements (and selects the clones) and prepends them to all paragraphs.
$("b").clone().prependTo("p");
<b>Hello</b><p>, how are you?</p>
<b>Hello</b><p><b>Hello</b>, how are you?</p>
Append all of the matched elements to another, specified, set of elements. This operation is, essentially, the reverse of doing a regular $(A).append(B), in that instead of appending B to A, you're appending A to B.
expr: String: A jQuery expression of elements to match.
jQuery
Appends all paragraphs to the element with the ID "foo"
$("p").appendTo("#foo");
<p>I would like to say: </p><div id="foo"></div>
<div id="foo"><p>I would like to say: </p></div>
Prepend all of the matched elements to another, specified, set of elements. This operation is, essentially, the reverse of doing a regular $(A).prepend(B), in that instead of prepending B to A, you're prepending A to B.
expr: String: A jQuery expression of elements to match.
jQuery
Prepends all paragraphs to the element with the ID "foo"
$("p").prependTo("#foo");
<p>I would like to say: </p><div id="foo"><b>Hello</b></div>
<div id="foo"><p>I would like to say: </p><b>Hello</b></div>
Insert all of the matched elements before another, specified, set of elements. This operation is, essentially, the reverse of doing a regular $(A).before(B), in that instead of inserting B before A, you're inserting A before B.
expr: String: A jQuery expression of elements to match.
jQuery
Same as $("#foo").before("p")
$("p").insertBefore("#foo");
<div id="foo">Hello</div><p>I would like to say: </p>
<p>I would like to say: </p><div id="foo">Hello</div>
Insert all of the matched elements after another, specified, set of elements. This operation is, essentially, the reverse of doing a regular $(A).after(B), in that instead of inserting B after A, you're inserting A after B.
expr: String: A jQuery expression of elements to match.
jQuery
Same as $("#foo").after("p")
$("p").insertAfter("#foo");
<p>I would like to say: </p><div id="foo">Hello</div>
<div id="foo">Hello</div><p>I would like to say: </p>
Removes all matched elements from the DOM. This does NOT remove them from the jQuery object, allowing you to use the matched elements further. Can be filtered with an optional expressions.
expr: String: (optional) A jQuery expression to filter elements by.
jQuery
$("p").remove();
<p>Hello</p> how are <p>you?</p>
how are
$("p").remove(".hello");
<p class="hello">Hello</p> how are <p>you?</p>
how are <p>you?</p>
Removes all child nodes from the set of matched elements.
jQuery
$("p").empty()
<p>Hello, <span>Person</span> <a href="#">and person</a></p>
[ <p></p> ]
End the most recent 'destructive' operation, reverting the list of matched elements back to its previous state. After an end operation, the list of matched elements will revert to the last state of matched elements. If there was no destructive operation before, an empty set is returned.
jQuery
Selects all paragraphs, finds span elements inside these, and reverts the selection back to the paragraphs.
$("p").find("span").end();
<p><span>Hello</span>, how are you?</p>
[ <p>...</p> ]
Searches for all elements that match the specified expression. This method is a good way to find additional descendant elements with which to process. All searching is done using a jQuery expression. The expression can be written using CSS 1-3 Selector syntax, or basic XPath.
expr: String: An expression to search with.
jQuery
Starts with all paragraphs and searches for descendant span elements, same as $("p span")
$("p").find("span");
<p><span>Hello</span>, how are you?</p>
[ <span>Hello</span> ]
Removes all elements from the set of matched elements that do not match the specified expression(s). This method is used to narrow down the results of a search. Provide a String array of expressions to apply multiple filters at once.
expression: String|Array<String>: Expression(s) to search with.
jQuery
Selects all paragraphs and removes those without a class "selected".
$("p").filter(".selected")
<p class="selected">Hello</p><p>How are you?</p>
[ <p class="selected">Hello</p> ]
Selects all paragraphs and removes those without class "selected" and being the first one.
$("p").filter([".selected", ":first"])
<p>Hello</p><p>Hello Again</p><p class="selected">And Again</p>
[ <p>Hello</p>, <p class="selected">And Again</p> ]
Removes all elements from the set of matched elements that do not pass the specified filter. This method is used to narrow down the results of a search.
filter: Function: A function to use for filtering
jQuery
Remove all elements that have a child ol element
$("p").filter(function(index) { return $("ol", this).length == 0; })
<p><ol><li>Hello</li></ol></p><p>How are you?</p>
[ <p>How are you?</p> ]
Removes the specified Element from the set of matched elements. This method is used to remove a single Element from a jQuery object.
el: Element: An element to remove from the set
jQuery
Removes the element with the ID "selected" from the set of all paragraphs.
$("p").not( $("#selected")[0] )
<p>Hello</p><p id="selected">Hello Again</p>
[ <p>Hello</p> ]
Removes elements matching the specified expression from the set of matched elements. This method is used to remove one or more elements from a jQuery object.
expr: String: An expression with which to remove matching elements
jQuery
Removes the element with the ID "selected" from the set of all paragraphs.
$("p").not("#selected")
<p>Hello</p><p id="selected">Hello Again</p>
[ <p>Hello</p> ]
Adds the elements matched by the expression to the jQuery object. This can be used to concatenate the result sets of two expressions.
expr: String: An expression whose matched elements are added
jQuery
$("p").add("span")
<p>Hello</p><p><span>Hello Again</span></p>
[ <p>Hello</p>, <span>Hello Again</span> ]
Adds one or more Elements to the set of matched elements. This is used to add a set of Elements to a jQuery object.
elements: Element|Array<Element>: One or more Elements to add
jQuery
$("p").add( document.getElementById("a") )
<p>Hello</p><p><span id="a">Hello Again</span></p>
[ <p>Hello</p>, <span id="a">Hello Again</span> ]
$("p").add([document.getElementById("a"), document.getElementById("b")])
<p>Hello</p><p><span id="a">Hello Again</span><span id="b">And Again</span></p>
[ <p>Hello</p>, <span id="a">Hello Again</span>, <span id="b">And Again</span> ]
Checks the current selection against an expression and returns true, if at least one element of the selection fits the given expression. Does return false, if no element fits or the expression is not valid. filter(String) is used internally, therefore all rules that apply there apply here, too.
expr: String: The expression with which to filter
Boolean
Returns true, because the parent of the input is a form element
$("input[@type='checkbox']").parent().is("form")
<form><input type="checkbox" /></form>
true
Returns false, because the parent of the input is a p element
$("input[@type='checkbox']").parent().is("form")
<form><p><input type="checkbox" /></p></form>
false
Get a set of elements containing the unique parents of the matched set of elements. Can be filtered with an optional expressions.
expr: String: (optional) An expression to filter the parents with
jQuery
Find the parent element of each paragraph.
$("p").parent()
<div><p>Hello</p><p>Hello</p></div>
[ <div><p>Hello</p><p>Hello</p></div> ]
Find the parent element of each paragraph with a class "selected".
$("p").parent(".selected")
<div><p>Hello</p></div><div class="selected"><p>Hello Again</p></div>
[ <div class="selected"><p>Hello Again</p></div> ]
Get a set of elements containing the unique ancestors of the matched set of elements (except for the root element). Can be filtered with an optional expressions.
expr: String: (optional) An expression to filter the ancestors with
jQuery
Find all parent elements of each span.
$("span").parents()
<html><body><div><p><span>Hello</span></p><span>Hello Again</span></div></body></html>
[ <body>...</body>, <div>...</div>, <p><span>Hello</span></p> ]
Find all parent elements of each span that is a paragraph.
$("span").parents("p")
<html><body><div><p><span>Hello</span></p><span>Hello Again</span></div></body></html>
[ <p><span>Hello</span></p> ]
Get a set of elements containing the unique next siblings of each of the matched set of elements. It only returns the very next sibling, not all next siblings. Can be filtered with an optional expressions.
expr: String: (optional) An expression to filter the next Elements with
jQuery
Find the very next sibling of each paragraph.
$("p").next()
<p>Hello</p><p>Hello Again</p><div><span>And Again</span></div>
[ <p>Hello Again</p>, <div><span>And Again</span></div> ]
Find the very next sibling of each paragraph that has a class "selected".
$("p").next(".selected")
<p>Hello</p><p class="selected">Hello Again</p><div><span>And Again</span></div>
[ <p class="selected">Hello Again</p> ]
Get a set of elements containing the unique previous siblings of each of the matched set of elements. Can be filtered with an optional expressions. It only returns the immediately previous sibling, not all previous siblings.
expr: String: (optional) An expression to filter the previous Elements with
jQuery
Find the very previous sibling of each paragraph.
$("p").prev()
<p>Hello</p><div><span>Hello Again</span></div><p>And Again</p>
[ <div><span>Hello Again</span></div> ]
Find the very previous sibling of each paragraph that has a class "selected".
$("p").prev(".selected")
<div><span>Hello</span></div><p class="selected">Hello Again</p><p>And Again</p>
[ <div><span>Hello</span></div> ]
Get a set of elements containing all of the unique siblings of each of the matched set of elements. Can be filtered with an optional expressions.
expr: String: (optional) An expression to filter the sibling Elements with
jQuery
Find all siblings of each div.
$("div").siblings()
<p>Hello</p><div><span>Hello Again</span></div><p>And Again</p>
[ <p>Hello</p>, <p>And Again</p> ]
Find all siblings with a class "selected" of each div.
$("div").siblings(".selected")
<div><span>Hello</span></div><p class="selected">Hello Again</p><p>And Again</p>
[ <p class="selected">Hello Again</p> ]
Get a set of elements containing all of the unique children of each of the matched set of elements. Can be filtered with an optional expressions.
expr: String: (optional) An expression to filter the child Elements with
jQuery
Find all children of each div.
$("div").children()
<p>Hello</p><div><span>Hello Again</span></div><p>And Again</p>
[ <span>Hello Again</span> ]
Find all children with a class "selected" of each div.
$("div").children(".selected")
<div><span>Hello</span><p class="selected">Hello Again</p><p>And Again</p></div>
[ <p class="selected">Hello Again</p> ]
Filter the set of elements to those that contain the specified text.
str: String: The string that will be contained within the text of an element.
jQuery
$("p").contains("test")
<p>This is just a test.</p><p>So is this</p>
[ <p>This is just a test.</p> ]
All ancestors of a given element.
elem: Element: The element to find the ancestors of.
Array<Element>
A handy, and fast, way to traverse in a particular direction and find a specific element.
cur: DOMElement: The element to search from.
num: Number|String: The Nth result to match. Can be a number or a string (like 'even' or 'odd').
dir: String: The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
DOMElement
All elements on a specified axis.
elem: Element: The element to find all the siblings of (including itself).
Array
Access a style property on the first matched element. This method makes it easy to retrieve a style property value from the first matched element.
name: String: The name of the property to access.
String
Retrieves the color style of the first paragraph
$("p").css("color");
<p style="color:red;">Test Paragraph.</p>
"red"
Retrieves the font-weight style of the first paragraph.
$("p").css("font-weight");
<p style="font-weight: bold;">Test Paragraph.</p>
"bold"
Set a key/value object as style properties to all matched elements. This serves as the best way to set a large number of style properties on all matched elements.
properties: Map: Key/value pairs to set as style properties.
jQuery
Sets color and background styles to all p elements.
$("p").css({ color: "red", background: "blue" });
<p>Test Paragraph.</p>
<p style="color:red; background:blue;">Test Paragraph.</p>
Set a single style property to a value, on all matched elements.
key: String: The name of the property to set.
value: Object: The value to set the property to.
jQuery
Changes the color of all paragraphs to red
$("p").css("color","red");
<p>Test Paragraph.</p>
<p style="color:red;">Test Paragraph.</p>
Extend one object with one or more others, returning the original, modified, object. This is a great utility for simple inheritance.
target: Object: The object to extend
prop1: Object: The object that will be merged into the first.
propN: Object: (optional) More objects to merge into the first
Object
Merge settings and options, modifying settings
var settings = { validate: false, limit: 5, name: "foo" }; var options = { validate: true, name: "bar" }; jQuery.extend(settings, options);
settings == { validate: true, limit: 5, name: "bar" }
Merge defaults and options, without modifying the defaults
var defaults = { validate: false, limit: 5, name: "foo" }; var options = { validate: true, name: "bar" }; var settings = jQuery.extend({}, defaults, options);
settings == { validate: true, limit: 5, name: "bar" }
A generic iterator function, which can be used to seemlessly iterate over both objects and arrays. This function is not the same as $().each() - which is used to iterate, exclusively, over a jQuery object. This function can be used to iterate over anything. The callback has two arguments:the key (objects) or index (arrays) as first the first, and the value as the second.
obj: Object: The object, or array, to iterate over.
fn: Function: The function that will be executed on every object.
Object
This is an example of iterating over the items in an array, accessing both the current item and its index.
$.each( [0,1,2], function(i, n){ alert( "Item #" + i + ": " + n ); });
This is an example of iterating over the properties in an Object, accessing both the current item and its key.
$.each( { name: "John", lang: "JS" }, function(i, n){ alert( "Name: " + i + ", Value: " + n ); });
Remove the whitespace from the beginning and end of a string.
str: String: The string to trim.
String
$.trim(" hello, how are you? ");
"hello, how are you?"
Merge two arrays together, removing all duplicates. The new array is: All the results from the first array, followed by the unique results from the second array.
first: Array: The first array to merge.
second: Array: The second array to merge.
Array
Merges two arrays, removing the duplicate 2
$.merge( [0,1,2], [2,3,4] )
[0,1,2,3,4]
Merges two arrays, removing the duplicates 3 and 2
$.merge( [3,2,1], [4,3,2] )
[3,2,1,4]
Filter items out of an array, by using a filter function. The specified function will be passed two arguments: The current array item and the index of the item in the array. The function must return 'true' to keep the item in the array, false to remove it.
array: Array: The Array to find items in.
fn: Function: The function to process each item against.
inv: Boolean: Invert the selection - select the opposite of the function.
Array
$.grep( [0,1,2], function(i){ return i > 0; });
[1, 2]
Translate all items in an array to another array of items. The translation function that is provided to this method is called for each item in the array and is passed one argument: The item to be translated. The function can then return the translated value, 'null' (to remove the item), or an array of values - which will be flattened into the full array.
array: Array: The Array to translate.
fn: Function: The function to process each item against.
Array
Maps the original array to a new one and adds 4 to each value.
$.map( [0,1,2], function(i){ return i + 4; });
[4, 5, 6]
Maps the original array to a new one and adds 1 to each value if it is bigger then zero, otherwise it's removed-
$.map( [0,1,2], function(i){ return i > 0 ? i + 1 : null; });
[2, 3]
Maps the original array to a new one, each element is added with it's original value and the value plus one.
$.map( [0,1,2], function(i){ return [ i, i + 1 ]; });
[0, 1, 1, 2, 2, 3]
Contains flags for the useragent, read from navigator.userAgent. Available flags are: safari, opera, msie, mozilla This property is available before the DOM is ready, therefore you can use it to add ready events only for certain browsers. There are situations where object detections is not reliable enough, in that cases it makes sense to use browser detection. Simply try to avoid both! A combination of browser and object detection yields quite reliable results.
Boolean
Returns true if the current useragent is some version of microsoft's internet explorer
$.browser.msie
Alerts "this is safari!" only for safari browsers
if($.browser.safari) { $( function() { alert("this is safari!"); } ); }
Displays each of the set of matched elements if they are hidden.
jQuery
$("p").show()
<p style="display: none">Hello</p>
[ <p style="display: block">Hello</p> ]
Hides each of the set of matched elements if they are shown.
jQuery
$("p").hide()
<p>Hello</p>
[ <p style="display: none">Hello</p> ] var pass = true, div = $("div"); div.hide().each(function(){ if ( this.style.display != "none" ) pass = false; }); ok( pass, "Hide" );
Toggles each of the set of matched elements. If they are shown, toggle makes them hidden. If they are hidden, toggle makes them shown.
jQuery
$("p").toggle()
<p>Hello</p><p style="display: none">Hello Again</p>
[ <p style="display: none">Hello</p>, <p style="display: block">Hello Again</p> ]
Displays each of the set of matched elements if they are hidden.
jQuery
$("p").show()
<p style="display: none">Hello</p>
[ <p style="display: block">Hello</p> ]
Show all matched elements using a graceful animation and firing an optional callback after completion. The height, width, and opacity of each of the matched elements are changed dynamically according to the specified speed.
speed: String|Number: A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").show("slow");
$("p").show("slow",function(){ alert("Animation Done."); });
Hides each of the set of matched elements if they are shown.
jQuery
$("p").hide()
<p>Hello</p>
[ <p style="display: none">Hello</p> ]
Hide all matched elements using a graceful animation and firing an optional callback after completion. The height, width, and opacity of each of the matched elements are changed dynamically according to the specified speed.
speed: String|Number: A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").hide("slow");
$("p").hide("slow",function(){ alert("Animation Done."); });
Toggles each of the set of matched elements. If they are shown, toggle makes them hidden. If they are hidden, toggle makes them shown.
jQuery
$("p").toggle()
<p>Hello</p><p style="display: none">Hello Again</p>
[ <p style="display: none">Hello</p>, <p style="display: block">Hello Again</p> ]
Reveal all matched elements by adjusting their height and firing an optional callback after completion. Only the height is adjusted for this animation, causing all matched elements to be revealed in a "sliding" manner.
speed: String|Number: (optional) A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").slideDown("slow");
$("p").slideDown("slow",function(){ alert("Animation Done."); });
slideUp(String|Number,Function)
slideToggle(String|Number,Function)
Hide all matched elements by adjusting their height and firing an optional callback after completion. Only the height is adjusted for this animation, causing all matched elements to be hidden in a "sliding" manner.
speed: String|Number: (optional) A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").slideUp("slow");
$("p").slideUp("slow",function(){ alert("Animation Done."); });
slideDown(String|Number,Function)
slideToggle(String|Number,Function)
Toggle the visibility of all matched elements by adjusting their height and firing an optional callback after completion. Only the height is adjusted for this animation, causing all matched elements to be hidden in a "sliding" manner.
speed: String|Number: (optional) A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").slideToggle("slow");
$("p").slideToggle("slow",function(){ alert("Animation Done."); });
slideDown(String|Number,Function)
slideUp(String|Number,Function)
Fade in all matched elements by adjusting their opacity and firing an optional callback after completion. Only the opacity is adjusted for this animation, meaning that all of the matched elements should already have some form of height and width associated with them.
speed: String|Number: (optional) A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").fadeIn("slow");
$("p").fadeIn("slow",function(){ alert("Animation Done."); });
fadeOut(String|Number,Function)
fadeTo(String|Number,Number,Function)
Fade out all matched elements by adjusting their opacity and firing an optional callback after completion. Only the opacity is adjusted for this animation, meaning that all of the matched elements should already have some form of height and width associated with them.
speed: String|Number: (optional) A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").fadeOut("slow");
$("p").fadeOut("slow",function(){ alert("Animation Done."); });
fadeIn(String|Number,Function)
fadeTo(String|Number,Number,Function)
Fade the opacity of all matched elements to a specified opacity and firing an optional callback after completion. Only the opacity is adjusted for this animation, meaning that all of the matched elements should already have some form of height and width associated with them.
speed: String|Number: A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
opacity: Number: The opacity to fade to (a number from 0 to 1).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").fadeTo("slow", 0.5);
$("p").fadeTo("slow", 0.5, function(){ alert("Animation Done."); });
fadeIn(String|Number,Function)
fadeOut(String|Number,Function)
A function for making your own, custom, animations. The key aspect of this function is the object of style properties that will be animated, and to what end. Each key within the object represents a style property that will also be animated (for example: "height", "top", or "opacity"). The value associated with the key represents to what end the property will be animated. If a number is provided as the value, then the style property will be transitioned from its current state to that new number. Oterwise if the string "hide", "show", or "toggle" is provided, a default animation will be constructed for that property.
params: Hash: A set of style attributes that you wish to animate, and to what end.
speed: String|Number: (optional) A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
easing: String: (optional) The name of the easing effect that you want to use (Plugin Required).
callback: Function: (optional) A function to be executed whenever the animation completes.
jQuery
$("p").animate({ height: 'toggle', opacity: 'toggle' }, "slow");
$("p").animate({ left: 50, opacity: 'show' }, 500);
An example of using an 'easing' function to provide a different style of animation. This will only work if you have a plugin that provides this easing function (Only 'linear' is provided by default, with jQuery).
$("p").animate({ opacity: 'show' }, "slow", "easein");
Binds a handler to a particular event (like click) for each matched element. The event handler is passed an event object that you can use to prevent default behaviour. To stop both default action and event bubbling, your handler has to return false. In most cases, you can define your event handlers as anonymous functions (see first example). In cases where that is not possible, you can pass additional data as the second paramter (and the handler function as the third), see second example.
type: String: An event type
data: Object: (optional) Additional data passed to the event handler as event.data
fn: Function: A function to bind to the event on each of the set of matched elements
jQuery
$("p").bind("click", function(){ alert( $(this).text() ); });
<p>Hello</p>
alert("Hello")
Pass some additional data to the event handler.
function handler(event) { alert(event.data.foo); } $("p").bind("click", {foo: "bar"}, handler)
alert("bar")
Cancel a default action and prevent it from bubbling by returning false from your function.
$("form").bind("submit", function() { return false; })
Cancel only the default action by using the preventDefault method.
$("form").bind("submit", function(event){ event.preventDefault(); });
Stop only an event from bubbling by using the stopPropagation method.
$("form").bind("submit", function(event){ event.stopPropagation(); });
Binds a handler to a particular event (like click) for each matched element. The handler is executed only once for each element. Otherwise, the same rules as described in bind() apply. The event handler is passed an event object that you can use to prevent default behaviour. To stop both default action and event bubbling, your handler has to return false. In most cases, you can define your event handlers as anonymous functions (see first example). In cases where that is not possible, you can pass additional data as the second paramter (and the handler function as the third), see second example.
type: String: An event type
data: Object: (optional) Additional data passed to the event handler as event.data
fn: Function: A function to bind to the event on each of the set of matched elements
jQuery
$("p").one("click", function(){ alert( $(this).text() ); });
<p>Hello</p>
alert("Hello")
The opposite of bind, removes a bound event from each of the matched elements. Without any arguments, all bound events are removed. If the type is provided, all bound events of that type are removed. If the function that was passed to bind is provided as the second argument, only that specific event handler is removed.
type: String: (optional) An event type
fn: Function: (optional) A function to unbind from the event on each of the set of matched elements
jQuery
$("p").unbind()
<p onclick="alert('Hello');">Hello</p>
[ <p>Hello</p> ]
$("p").unbind( "click" )
<p onclick="alert('Hello');">Hello</p>
[ <p>Hello</p> ]
$("p").unbind( "click", function() { alert("Hello"); } )
<p onclick="alert('Hello');">Hello</p>
[ <p>Hello</p> ]
Trigger a type of event on every matched element.
type: String: An event type to trigger.
jQuery
$("p").trigger("click")
<p click="alert('hello')">Hello</p>
alert('hello')
Toggle between two function calls every other click. Whenever a matched element is clicked, the first specified function is fired, when clicked again, the second is fired. All subsequent clicks continue to rotate through the two functions. Use unbind("click") to remove.
even: Function: The function to execute on every even click.
odd: Function: The function to execute on every odd click.
jQuery
$("p").toggle(function(){ $(this).addClass("selected"); },function(){ $(this).removeClass("selected"); });
A method for simulating hovering (moving the mouse on, and off, an object). This is a custom method which provides an 'in' to a frequent task. Whenever the mouse cursor is moved over a matched element, the first specified function is fired. Whenever the mouse moves off of the element, the second specified function fires. Additionally, checks are in place to see if the mouse is still within the specified element itself (for example, an image inside of a div), and if it is, it will continue to 'hover', and not move out (a common error in using a mouseout event handler).
over: Function: The function to fire whenever the mouse is moved over a matched element.
out: Function: The function to fire whenever the mouse is moved off of a matched element.
jQuery
$("p").hover(function(){ $(this).addClass("over"); },function(){ $(this).addClass("out"); });
Bind a function to be executed whenever the DOM is ready to be traversed and manipulated. This is probably the most important function included in the event module, as it can greatly improve the response times of your web applications. In a nutshell, this is a solid replacement for using window.onload, and attaching a function to that. By using this method, your bound Function will be called the instant the DOM is ready to be read and manipulated, which is exactly what 99.99% of all Javascript code needs to run. Please ensure you have no code in your <body> onload event handler, otherwise $(document).ready() may not fire. You can have as many $(document).ready events on your page as you like. The functions are then executed in the order they were added.
fn: Function: The function to be executed when the DOM is ready.
jQuery
$(document).ready(function(){ Your code here... });
Bind a function to the scroll event of each matched element.
fn: Function: A function to bind to the scroll event on each of the matched elements.
jQuery
$("p").scroll( function() { alert("Hello"); } );
<p>Hello</p>
<p onscroll="alert('Hello');">Hello</p>
Bind a function to the submit event of each matched element.
fn: Function: A function to bind to the submit event on each of the matched elements.
jQuery
Prevents the form submission when the input has no value entered.
$("#myform").submit( function() { return $("input", this).val().length > 0; } );
<form id="myform"><input /></form>
Trigger the submit event of each matched element. This causes all of the functions that have been bound to thet submit event to be executed. Note: This does not execute the submit method of the form element! If you need to submit the form via code, you have to use the DOM method, eg. $("form")[0].submit();
jQuery
Triggers all submit events registered for forms, but does not submit the form
$("form").submit();
Bind a function to the focus event of each matched element.
fn: Function: A function to bind to the focus event on each of the matched elements.
jQuery
$("p").focus( function() { alert("Hello"); } );
<p>Hello</p>
<p onfocus="alert('Hello');">Hello</p>
Trigger the focus event of each matched element. This causes all of the functions that have been bound to thet focus event to be executed. Note: This does not execute the focus method of the underlying elements! If you need to focus an element via code, you have to use the DOM method, eg. $("#myinput")[0].focus();
jQuery
$("p").focus();
<p onfocus="alert('Hello');">Hello</p>
alert('Hello');
Bind a function to the keydown event of each matched element.
fn: Function: A function to bind to the keydown event on each of the matched elements.
jQuery
$("p").keydown( function() { alert("Hello"); } );
<p>Hello</p>
<p onkeydown="alert('Hello');">Hello</p>
Bind a function to the dblclick event of each matched element.
fn: Function: A function to bind to the dblclick event on each of the matched elements.
jQuery
$("p").dblclick( function() { alert("Hello"); } );
<p>Hello</p>
<p ondblclick="alert('Hello');">Hello</p>
Bind a function to the keypress event of each matched element.
fn: Function: A function to bind to the keypress event on each of the matched elements.
jQuery
$("p").keypress( function() { alert("Hello"); } );
<p>Hello</p>
<p onkeypress="alert('Hello');">Hello</p>
Bind a function to the error event of each matched element.
fn: Function: A function to bind to the error event on each of the matched elements.
jQuery
$("p").error( function() { alert("Hello"); } );
<p>Hello</p>
<p onerror="alert('Hello');">Hello</p>
Bind a function to the blur event of each matched element.
fn: Function: A function to bind to the blur event on each of the matched elements.
jQuery
$("p").blur( function() { alert("Hello"); } );
<p>Hello</p>
<p onblur="alert('Hello');">Hello</p>
Trigger the blur event of each matched element. This causes all of the functions that have been bound to thet blur event to be executed. Note: This does not execute the blur method of the underlying elements! If you need to blur an element via code, you have to use the DOM method, eg. $("#myinput")[0].blur();
jQuery
$("p").blur();
<p onblur="alert('Hello');">Hello</p>
alert('Hello');
Bind a function to the load event of each matched element.
fn: Function: A function to bind to the load event on each of the matched elements.
jQuery
$("p").load( function() { alert("Hello"); } );
<p>Hello</p>
<p onload="alert('Hello');">Hello</p>
Bind a function to the select event of each matched element.
fn: Function: A function to bind to the select event on each of the matched elements.
jQuery
$("p").select( function() { alert("Hello"); } );
<p>Hello</p>
<p onselect="alert('Hello');">Hello</p>
Trigger the select event of each matched element. This causes all of the functions that have been bound to thet select event to be executed.
jQuery
$("p").select();
<p onselect="alert('Hello');">Hello</p>
alert('Hello');
Bind a function to the mouseup event of each matched element.
fn: Function: A function to bind to the mouseup event on each of the matched elements.
jQuery
$("p").mouseup( function() { alert("Hello"); } );
<p>Hello</p>
<p onmouseup="alert('Hello');">Hello</p>
Bind a function to the unload event of each matched element.
fn: Function: A function to bind to the unload event on each of the matched elements.
jQuery
$("p").unload( function() { alert("Hello"); } );
<p>Hello</p>
<p onunload="alert('Hello');">Hello</p>
Bind a function to the change event of each matched element.
fn: Function: A function to bind to the change event on each of the matched elements.
jQuery
$("p").change( function() { alert("Hello"); } );
<p>Hello</p>
<p onchange="alert('Hello');">Hello</p>
Bind a function to the mouseout event of each matched element.
fn: Function: A function to bind to the mouseout event on each of the matched elements.
jQuery
$("p").mouseout( function() { alert("Hello"); } );
<p>Hello</p>
<p onmouseout="alert('Hello');">Hello</p>
Bind a function to the keyup event of each matched element.
fn: Function: A function to bind to the keyup event on each of the matched elements.
jQuery
$("p").keyup( function() { alert("Hello"); } );
<p>Hello</p>
<p onkeyup="alert('Hello');">Hello</p>
Bind a function to the click event of each matched element.
fn: Function: A function to bind to the click event on each of the matched elements.
jQuery
$("p").click( function() { alert("Hello"); } );
<p>Hello</p>
<p onclick="alert('Hello');">Hello</p>
Trigger the click event of each matched element. This causes all of the functions that have been bound to thet click event to be executed.
jQuery
$("p").click();
<p onclick="alert('Hello');">Hello</p>
alert('Hello');
Bind a function to the resize event of each matched element.
fn: Function: A function to bind to the resize event on each of the matched elements.
jQuery
$("p").resize( function() { alert("Hello"); } );
<p>Hello</p>
<p onresize="alert('Hello');">Hello</p>
Bind a function to the mousemove event of each matched element.
fn: Function: A function to bind to the mousemove event on each of the matched elements.
jQuery
$("p").mousemove( function() { alert("Hello"); } );
<p>Hello</p>
<p onmousemove="alert('Hello');">Hello</p>
Bind a function to the mousedown event of each matched element.
fn: Function: A function to bind to the mousedown event on each of the matched elements.
jQuery
$("p").mousedown( function() { alert("Hello"); } );
<p>Hello</p>
<p onmousedown="alert('Hello');">Hello</p>
Bind a function to the mouseover event of each matched element.
fn: Function: A function to bind to the mousedown event on each of the matched elements.
jQuery
$("p").mouseover( function() { alert("Hello"); } );
<p>Hello</p>
<p onmouseover="alert('Hello');">Hello</p>
Load HTML from a remote file and inject it into the DOM, only if it's been modified by the server.
url: String: The URL of the HTML file to load.
params: Map: (optional) Key/value pairs that will be sent to the server.
callback: Function: (optional) A function to be executed whenever the data is loaded (parameters: responseText, status and response itself).
jQuery
$("#feeds").loadIfModified("feeds.html");
<div id="feeds"></div>
<div id="feeds"><b>45</b> feeds found.</div>
Load HTML from a remote file and inject it into the DOM. Note: Avoid to use this to load scripts, instead use $.getScript. IE strips script tags when there aren't any other characters in front of it.
url: String: The URL of the HTML file to load.
params: Object: (optional) A set of key/value pairs that will be sent as data to the server.
callback: Function: (optional) A function to be executed whenever the data is loaded (parameters: responseText, status and response itself).
jQuery
$("#feeds").load("feeds.html");
<div id="feeds"></div>
<div id="feeds"><b>45</b> feeds found.</div>
Same as above, but with an additional parameter and a callback that is executed when the data was loaded.
$("#feeds").load("feeds.html", {limit: 25}, function() { alert("The last 25 entries in the feed have been loaded"); } );
Serializes a set of input elements into a string of data. This will serialize all given elements. A serialization similar to the form submit of a browser is provided by the form plugin. It also takes multiple-selects into account, while this method recognizes only a single option.
String
Serialize a selection of input elements to a string
$("input[@type=text]").serialize();
<input type='text' name='name' value='John'/> <input type='text' name='location' value='Boston'/>
Evaluate all script tags inside this jQuery. If they have a src attribute, the script is loaded, otherwise it's content is evaluated.
jQuery
Attach a function to be executed whenever an AJAX request begins and there is none already active.
callback: Function: The function to execute.
jQuery
Show a loading message whenever an AJAX request starts (and none is already active).
$("#loading").ajaxStart(function(){ $(this).show(); });
Attach a function to be executed whenever all AJAX requests have ended.
callback: Function: The function to execute.
jQuery
Hide a loading message after all the AJAX requests have stopped.
$("#loading").ajaxStop(function(){ $(this).hide(); });
Attach a function to be executed whenever an AJAX request completes. The XMLHttpRequest and settings used for that request are passed as arguments to the callback.
callback: Function: The function to execute.
jQuery
Show a message when an AJAX request completes.
$("#msg").ajaxComplete(function(request, settings){ $(this).append("<li>Request Complete.</li>"); });
Attach a function to be executed whenever an AJAX request completes successfully. The XMLHttpRequest and settings used for that request are passed as arguments to the callback.
callback: Function: The function to execute.
jQuery
Show a message when an AJAX request completes successfully.
$("#msg").ajaxSuccess(function(request, settings){ $(this).append("<li>Successful Request!</li>"); });
Attach a function to be executed whenever an AJAX request fails. The XMLHttpRequest and settings used for that request are passed as arguments to the callback. A third argument, an exception object, is passed if an exception occured while processing the request.
callback: Function: The function to execute.
jQuery
Show a message when an AJAX request fails.
$("#msg").ajaxError(function(request, settings){ $(this).append("<li>Error requesting page " + settings.url + "</li>"); });
Attach a function to be executed before an AJAX request is send. The XMLHttpRequest and settings used for that request are passed as arguments to the callback.
callback: Function: The function to execute.
jQuery
Show a message before an AJAX request is send.
$("#msg").ajaxSend(function(request, settings){ $(this).append("<li>Starting request at " + settings.url + "</li>"); });
Load a remote page using an HTTP GET request.
url: String: The URL of the page to load.
params: Map: (optional) Key/value pairs that will be sent to the server.
callback: Function: (optional) A function to be executed whenever the data is loaded.
XMLHttpRequest
$.get("test.cgi");
$.get("test.cgi", { name: "John", time: "2pm" } );
$.get("test.cgi", function(data){ alert("Data Loaded: " + data); });
$.get("test.cgi", { name: "John", time: "2pm" }, function(data){ alert("Data Loaded: " + data); } );
Load a remote page using an HTTP GET request, only if it hasn't been modified since it was last retrieved.
url: String: The URL of the page to load.
params: Map: (optional) Key/value pairs that will be sent to the server.
callback: Function: (optional) A function to be executed whenever the data is loaded.
XMLHttpRequest
$.getIfModified("test.html");
$.getIfModified("test.html", { name: "John", time: "2pm" } );
$.getIfModified("test.cgi", function(data){ alert("Data Loaded: " + data); });
$.getifModified("test.cgi", { name: "John", time: "2pm" }, function(data){ alert("Data Loaded: " + data); } );
Loads, and executes, a remote JavaScript file using an HTTP GET request. Warning: Safari <= 2.0.x is unable to evalulate scripts in a global context synchronously. If you load functions via getScript, make sure to call them after a delay.
url: String: The URL of the page to load.
callback: Function: (optional) A function to be executed whenever the data is loaded.
XMLHttpRequest
$.getScript("test.js");
$.getScript("test.js", function(){ alert("Script loaded and executed."); });
Load JSON data using an HTTP GET request.
url: String: The URL of the page to load.
params: Map: (optional) Key/value pairs that will be sent to the server.
callback: Function: A function to be executed whenever the data is loaded.
XMLHttpRequest
$.getJSON("test.js", function(json){ alert("JSON Data: " + json.users[3].name); });
$.getJSON("test.js", { name: "John", time: "2pm" }, function(json){ alert("JSON Data: " + json.users[3].name); } );
Load a remote page using an HTTP POST request.
url: String: The URL of the page to load.
params: Map: (optional) Key/value pairs that will be sent to the server.
callback: Function: (optional) A function to be executed whenever the data is loaded.
XMLHttpRequest
$.post("test.cgi");
$.post("test.cgi", { name: "John", time: "2pm" } );
$.post("test.cgi", function(data){ alert("Data Loaded: " + data); });
$.post("test.cgi", { name: "John", time: "2pm" }, function(data){ alert("Data Loaded: " + data); } );
Set the timeout of all AJAX requests to a specific amount of time. This will make all future AJAX requests timeout after a specified amount of time. Set to null or 0 to disable timeouts (default). You can manually abort requests with the XMLHttpRequest's (returned by all ajax functions) abort() method. Deprecated. Use $.ajaxSetup instead.
time: Number: How long before an AJAX request times out.
undefined
Make all AJAX requests timeout after 5 seconds.
$.ajaxTimeout( 5000 );
Setup global settings for AJAX requests. See $.ajax for a description of all available options.
settings: Map: Key/value pairs to use for all AJAX requests
undefined
Sets the defaults for AJAX requests to the url "/xmlhttp/", disables global handlers and uses POST instead of GET. The following AJAX requests then sends some data without having to set anything else.
$.ajaxSetup( { url: "/xmlhttp/", global: false, type: "POST" } ); $.ajax({ data: myData });
Load a remote page using an HTTP request. This is jQuery's low-level AJAX implementation. See $.get, $.post etc. for higher-level abstractions. $.ajax() returns the XMLHttpRequest that it creates. In most cases you won't need that object to manipulate directly, but it is available if you need to abort the request manually. Note: Make sure the server sends the right mimetype (eg. xml as "text/xml"). Sending the wrong mimetype will get you into serious trouble that jQuery can't solve. Supported datatypes are (see dataType option): "xml": Returns a XML document that can be processed via jQuery. "html": Returns HTML as plain text, included script tags are evaluated. "script": Evaluates the response as Javascript and returns it as plain text. "json": Evaluates the response as JSON and returns a Javascript Object $.ajax() takes one argument, an object of key/value pairs, that are used to initalize and handle the request. These are all the key/values that can be used: (String) url - The URL to request. (String) type - The type of request to make ("POST" or "GET"), default is "GET". (String) dataType - The type of data that you're expecting back from the server. No default: If the server sends xml, the responseXML, otherwise the responseText is passed to the success callback. (Boolean) ifModified - Allow the request to be successful only if the response has changed since the last request. This is done by checking the Last-Modified header. Default value is false, ignoring the header. (Number) timeout - Local timeout to override global timeout, eg. to give a single request a longer timeout while all others timeout after 1 second. See $.ajaxTimeout() for global timeouts. (Boolean) global - Whether to trigger global AJAX event handlers for this request, default is true. Set to false to prevent that global handlers like ajaxStart or ajaxStop are triggered. (Function) error - A function to be called if the request fails. The function gets passed tree arguments: The XMLHttpRequest object, a string describing the type of error that occurred and an optional exception object, if one occured. (Function) success - A function to be called if the request succeeds. The function gets passed one argument: The data returned from the server, formatted according to the 'dataType' parameter. (Function) complete - A function to be called when the request finishes. The function gets passed two arguments: The XMLHttpRequest object and a string describing the type of success of the request. (Object|String) data - Data to be sent to the server. Converted to a query string, if not already a string. Is appended to the url for GET-requests. See processData option to prevent this automatic processing. (String) contentType - When sending data to the server, use this content-type. Default is "application/x-www-form-urlencoded", which is fine for most cases. (Boolean) processData - By default, data passed in to the data option as an object other as string will be processed and transformed into a query string, fitting to the default content-type "application/x-www-form-urlencoded". If you want to send DOMDocuments, set this option to false. (Boolean) async - By default, all requests are send asynchronous (set to true). If you need synchronous requests, set this option to false. (Function) beforeSend - A pre-callback to set custom headers etc., the XMLHttpRequest is passed as the only argument.
properties: Map: Key/value pairs to initialize the request with.
XMLHttpRequest
Load and execute a JavaScript file.
$.ajax({ type: "GET", url: "test.js", dataType: "script" })
Save some data to the server and notify the user once its complete.
$.ajax({ type: "POST", url: "some.php", data: "name=John&location=Boston", success: function(msg){ alert( "Data Saved: " + msg ); } });
Loads data synchronously. Blocks the browser while the requests is active. It is better to block user interaction with others means when synchronization is necessary, instead to block the complete browser.
var html = $.ajax({ url: "some.php", async: false }).responseText;
Sends an xml document as data to the server. By setting the processData option to false, the automatic conversion of data to strings is prevented.
var xmlDocument = [create xml document]; $.ajax({ url: "page.php", processData: false, data: xmlDocument, success: handleResponse });
Creates a button from an image element. This function attempts to mimic the functionality of the "button" found in modern day GUIs. There are two different buttons you can create using this plugin; Normal buttons, and Toggle buttons.
hash: hOptions: with options, described below. sPath Full path to the images, either relative or with full URL sExt Extension of the used images (jpg|gif|png) sName Name of the button, if not specified, try to fetch from id iWidth Width of the button, if not specified, try to fetch from element.width iHeight Height of the button, if not specified, try to fetch from element.height onAction Function to call when clicked / toggled. In case of a string, the element is wrapped inside an href tag. bToggle Do we need to create a togglebutton? (boolean) bState Initial state of the button? (boolean) sType Type of hover to create (img|css)
jQuery
Takes all matched elements and centers them, absolutely, within the context of their parent element. Great for doing slideshows.
jQuery
$("div img").center();
Create a cookie with the given name and value and other optional parameters.
name: String: The name of the cookie.
value: String: The value of the cookie.
options: Object: An object literal containing key/value pairs to provide optional cookie attributes.
expires: Number|Date: Either an integer specifying the expiration date from now on in days or a Date object. If a negative value is specified (e.g. a date in the past), the cookie will be deleted. If set to null or omitted, the cookie will be a session cookie and will not be retained when the the browser exits.
path: String: The value of the path atribute of the cookie (default: path of page that created the cookie).
domain: String: The value of the domain attribute of the cookie (default: domain of page that created the cookie).
secure: Boolean: If true, the secure attribute of the cookie will be set and the cookie transmission will require a secure protocol (like HTTPS).
undefined
Set the value of a cookie.
$.cookie('the_cookie', 'the_value');
Create a cookie with all available options.
$.cookie('the_cookie', 'the_value', {expires: 7, path: '/', domain: 'jquery.com', secure: true});
Create a session cookie.
$.cookie('the_cookie', 'the_value');
Delete a cookie by setting a date in the past.
$.cookie('the_cookie', '', {expires: -1});
Get the value of a cookie with the given name.
name: String: The name of the cookie.
String
Get the value of a cookie.
$.cookie('the_cookie');
Returns the css height value for the first matched element. If used on document, returns the document's height (innerHeight) If used on window, returns the viewport's (window) height
Object
$("#testdiv").height()
"200px"
$(document).height();
800
$(window).height();
400
Returns the css width value for the first matched element. If used on document, returns the document's width (innerWidth) If used on window, returns the viewport's (window) width
Object
$("#testdiv").width()
"200px"
$(document).width();
800
$(window).width();
400
Returns the inner height value (without border) for the first matched element. If used on document, returns the document's height (innerHeight) If used on window, returns the viewport's (window) height
Number
$("#testdiv").innerHeight()
800
Returns the inner width value (without border) for the first matched element. If used on document, returns the document's Width (innerWidth) If used on window, returns the viewport's (window) width
Number
$("#testdiv").innerWidth()
1000
Returns the outer height value (including border) for the first matched element. Cannot be used on document or window.
Number
$("#testdiv").outerHeight()
1000
Returns the outer width value (including border) for the first matched element. Cannot be used on document or window.
Number
$("#testdiv").outerWidth()
1000
Returns how many pixels the user has scrolled to the right (scrollLeft). Works on containers with overflow: auto and window/document.
Number
$("#testdiv").scrollLeft()
100
Returns how many pixels the user has scrolled to the bottom (scrollTop). Works on containers with overflow: auto and window/document.
Number
$("#testdiv").scrollTop()
100
This returns an object with top, left, width, height, borderLeft, borderTop, marginLeft, marginTop, scrollLeft, scrollTop, pageXOffset, pageYOffset. The top and left values include the scroll offsets but the scrollLeft and scrollTop properties of the returned object are the combined scroll offets of the parent elements (not including the window scroll offsets). This is not the same as the element's scrollTop and scrollLeft. For accurate readings make sure to use pixel values.
Object
This returns an object with top, left, width, height, borderLeft, borderTop, marginLeft, marginTop, scrollLeft, scrollTop, pageXOffset, pageYOffset. The top and left values include the scroll offsets but the scrollLeft and scrollTop properties of the returned object are the combined scroll offets of the parent elements (not including the window scroll offsets). This is not the same as the element's scrollTop and scrollLeft. For accurate readings make sure to use pixel values.
refElement: String: This is an expression. The offset returned will be relative to the first matched element.
Object
This returns an object with top, left, width, height, borderLeft, borderTop, marginLeft, marginTop, scrollLeft, scrollTop, pageXOffset, pageYOffset. The top and left values include the scroll offsets but the scrollLeft and scrollTop properties of the returned object are the combined scroll offets of the parent elements (not including the window scroll offsets). This is not the same as the element's scrollTop and scrollLeft. For accurate readings make sure to use pixel values.
refElement: jQuery: The offset returned will be relative to the first matched element.
Object
This returns an object with top, left, width, height, borderLeft, borderTop, marginLeft, marginTop, scrollLeft, scrollTop, pageXOffset, pageYOffset. The top and left values include the scroll offsets but the scrollLeft and scrollTop properties of the returned object are the combined scroll offets of the parent elements (not including the window scroll offsets). This is not the same as the element's scrollTop and scrollLeft. For accurate readings make sure to use pixel values.
refElement: HTMLElement: The offset returned will be relative to this element.
Object
Sets the type of metadata to use. Metadata is encoded in JSON, and each property in the JSON will become a property of the element itself. There are three supported types of metadata storage: attr: Inside an attribute. The name parameter indicates *which* attribute. class: Inside the class attribute, wrapped in curly braces: { } elem: Inside a child element (e.g. a script tag). The name parameter indicates *which* element. The metadata for an element is loaded the first time the element is accessed via jQuery. As a result, you can define the metadata type, use $(expr) to load the metadata into the elements matched by expr, then redefine the metadata type and run another $(expr) for other elements.
type: String: The encoding type
name: String: The name of the attribute to be used to get metadata (optional)
undefined
Reads metadata from the class attribute
<p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
$.meta.setType("class")
Reads metadata from a "data" attribute
<p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
$.meta.setType("attr", "data")
Reads metadata from a nested script element
<p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
$.meta.setType("elem", "script")
Returns the metadata object for the first member of the jQuery object.
jQuery
ajaxSubmit() provides a mechanism for submitting an HTML form using AJAX. ajaxSubmit accepts a single argument which can be either a success callback function or an options Object. If a function is provided it will be invoked upon successful completion of the submit and will be passed the response from the server. If an options Object is provided, the following attributes are supported: target: Identifies the element(s) in the page to be updated with the server response. This value may be specified as a jQuery selection string, a jQuery object, or a DOM element. default value: null url: URL to which the form data will be submitted. default value: value of form's 'action' attribute method:
object: options: literal containing options which control the form submission process
jQuery
Submit form and alert server response
$('#myForm').ajaxSubmit(function(data) { alert('Form submit succeeded! Server returned: ' + data); });
Submit form and update page element with server response
var options = { target: '#myTargetDiv' }; $('#myForm').ajaxSubmit(options);
Submit form and alert the server response
var options = { success: function(responseText) { alert(responseText); } }; $('#myForm').ajaxSubmit(options);
Pre-submit validation which aborts the submit operation if form data is empty
var options = { beforeSubmit: function(formArray, jqForm) { if (formArray.length == 0) { alert('Please enter data.'); return false; } } }; $('#myForm').ajaxSubmit(options);
json dat