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. $(Element) $(Element<Array>) An expression to search with (optional) A DOM Element, or Document, representing the base context. This finds all p elements that are children of a div element. one <div>two</div> three $("div > p") [ two ] 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) This function accepts a string of raw HTML. The HTML string is different from the traditional selectors in that it creates the DOM elements representing that HTML string, on the fly, to be (assumedly) inserted into the document later. A string of HTML to create on the fly. 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>Hello</div>").appendTo("#body") Wrap jQuery functionality around a specific DOM Element. This function also accepts XML Documents and Window objects as valid arguments (even though they are not DOM Elements). A DOM element to be encapsulated by a jQuery object. $(document).find("div > p") [ two ] one <div>two</div> three Sets the background color of the page to black. $(document.body).background( "black" ); Wrap jQuery functionality around a set of DOM Elements. An array of DOM elements to be encapsulated by a jQuery object. 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. The function to execute when the DOM is ready. 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. The jQuery object to be cloned. 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. The number of elements currently matched. $("img").length; 2 <img src="test1.jpg"/> <img src="test2.jpg"/> The number of elements currently matched. $("img").size(); 2 <img src="test1.jpg"/> <img src="test2.jpg"/> 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). $("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. Access the element in the Nth position. $("img").get(1); [ <img src="test1.jpg"/> ] <img src="test1.jpg"/> <img src="test2.jpg"/> Set the jQuery object to an array of elements. An array of elements $("img").set([ document.body ]); $("img").set() == [ 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. A function to execute Iterates over two images and sets their src property <img/> <img/>

$("img").each(function(i){
  this.src = "test" + i + ".jpg";
});

<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. Object to search for $("*").index(document.getElementById('foobar')) 0 <div id="foobar"></div> $("*").index(document.getElementById('foo')) 2 <div id="foobar"></div> $("*").index(document.getElementById('bar')) -1 <div id="foobar"></div> Access a property on the first matched element. This method makes it easy to retrieve a property value from the first matched element. The name of the property to access. $("img").attr("src"); test.jpg <img src="test.jpg"/> Set a hash of key/value object properties to all matched elements. This serves as the best way to set a large number of properties on all matched elements. A set of key/value pairs to set as object properties. $("img").attr({ src: "test.jpg", alt: "Test Image" }); <img src="test.jpg" alt="Test Image"/> <img/> Set a single property to a value, on all matched elements. 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. The name of the property to set. The value to set the property to. $("img").attr("src","test.jpg"); <img src="test.jpg"/> <img/> 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. The name of the property to access. Retrieves the color style of the first paragraph Test Paragraph. $("p").css("color"); red Retrieves the font-weight style of the first paragraph. Note that for all style properties with a dash (like 'font-weight'), you have to write it in camelCase. In other words: Every time you have a '-' in a property, remove it and replace the next character with an uppercase representation of itself. Eg. fontWeight, fontSize, fontFamily, borderWidth, borderStyle, borderBottomWidth etc. Test Paragraph. $("p").css("fontWeight"); bold Set a hash of key/value style properties to all matched elements. This serves as the best way to set a large number of style properties on all matched elements. A set of key/value pairs to set as style properties. $("p").css({ color: "red", background: "blue" }); Test Paragraph. Test Paragraph. Set a single style property to a value, on all matched elements. The name of the property to set. The value to set the property to. Changes the color of all paragraphs to red Test Paragraph. $("p").css("color","red"); Test Paragraph. Retrieve 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. $("p").text(); Test Paragraph. Test Paragraph. 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. A string of HTML, that will be created on the fly and wrapped around the target. $("p").wrap("<div class='wrap'></div>"); <div class='wrap'>Test Paragraph.</div> Test Paragraph. 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. A DOM element that will be wrapped. $("p").wrap( document.getElementById('content') ); <div id="content">Test Paragraph.</div> Test Paragraph.<div id="content"></div> Append any number of elements to the inside of every matched elements, generated from the provided HTML. This operation is similar to doing an appendChild to all the specified elements, adding them into the document. A string of HTML, that will be created on the fly and appended to the target. $("p").append("Hello"); I would like to say: Hello I would like to say: Append an element to the inside of all matched elements. This operation is similar to doing an appendChild to all the specified elements, adding them into the document. A DOM element that will be appended. $("p").append( $("#foo")[0] ); I would like to say: Hello I would like to say: Hello Append any number of elements to the inside of all matched elements. This operation is similar to doing an appendChild to all the specified elements, adding them into the document. An array of elements, all of which will be appended. $("p").append( $("b") ); I would like to say: Hello I would like to say: Hello Prepend any number of elements to the inside of every matched elements, generated from the provided HTML. This operation is the best way to insert dynamically created elements inside, at the beginning, of all the matched element. A string of HTML, that will be created on the fly and appended to the target. $("p").prepend("Hello"); HelloI would like to say: I would like to say: Prepend an element to the inside of all matched elements. This operation is the best way to insert an element inside, at the beginning, of all the matched element. A DOM element that will be appended. $("p").prepend( $("#foo")[0] ); HelloI would like to say: I would like to say: Hello Prepend any number of elements to the inside of all matched elements. This operation is the best way to insert a set of elements inside, at the beginning, of all the matched element. An array of elements, all of which will be appended. $("p").prepend( $("b") ); HelloI would like to say: I would like to say: Hello Insert any number of dynamically generated elements before each of the matched elements. A string of HTML, that will be created on the fly and appended to the target. $("p").before("Hello"); HelloI would like to say: I would like to say: Insert an element before each of the matched elements. A DOM element that will be appended. $("p").before( $("#foo")[0] ); HelloI would like to say: I would like to say: Hello Insert any number of elements before each of the matched elements. An array of elements, all of which will be appended. $("p").before( $("b") ); HelloI would like to say: I would like to say: Hello Insert any number of dynamically generated elements after each of the matched elements. A string of HTML, that will be created on the fly and appended to the target. $("p").after("Hello"); I would like to say: Hello I would like to say: Insert an element after each of the matched elements. A DOM element that will be appended. $("p").after( $("#foo")[0] ); I would like to say: Hello HelloI would like to say: Insert any number of elements after each of the matched elements. An array of elements, all of which will be appended. $("p").after( $("b") ); I would like to say: Hello HelloI would like to say: 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. $("p").find("span").end(); $("p").find("span").end() == [ ... ] Hello, how are you? Searches for all elements that match the specified expression. This method is the optimal way of finding 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. An expression to search with. $("p").find("span"); $("p").find("span") == [ Hello ] Hello, how are you? Create cloned copies of all matched DOM Elements. This does not create a cloned copy of this particular jQuery object, instead it creates duplicate copies of all DOM Elements. This is useful for moving copies of the elements to another location in the DOM. $("b").clone().prependTo("p"); HelloHello, how are you? Hello, how are you? Removes all elements from the set of matched elements that do not match the specified expression. This method is used to narrow down the results of a search. All searching is done using a jQuery expression. The expression can be written using CSS 1-3 Selector syntax, or basic XPath. An expression to search with. $("p").filter(".selected") $("p").filter(".selected") == [ Hello ] HelloHow are you? Removes all elements from the set of matched elements that do not match at least one of the expressions passed to the function. This method is used when you want to filter the set of matched elements through more than one expression. Elements will be retained in the jQuery object if they match at least one of the expressions passed. A set of expressions to evaluate against $("p").filter([".selected", ":first"]) $("p").filter([".selected", ":first"]) == [ Hello, And Again ] HelloHello AgainAnd Again Removes the specified Element from the set of matched elements. This method is used to remove a single Element from a jQuery object. An element to remove from the set $("p").not( document.getElementById("selected") ) [ Hello ] HelloHello Again 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. An expression with which to remove matching elements $("p").not("#selected") [ Hello ] HelloHello Again Adds the elements matched by the expression to the jQuery object. This can be used to concatenate the result sets of two expressions. An expression whose matched elements are added $("p").add("span") [ Hello, Hello Again ] HelloHello Again Adds each of the Elements in the array to the set of matched elements. This is used to add a set of Elements to a jQuery object. An array of Elements to add $("p").add([document.getElementById("a"), document.getElementById("b")]) [ Hello, Hello Again, And Again ] HelloHello AgainAnd Again Adds a single Element to the set of matched elements. This is used to add a single Element to a jQuery object. An Element to add $("p").add( document.getElementById("a") ) [ Hello, Hello Again ] HelloHello Again 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. The expression with which to filter Returns true, because the parent of the input is a form element <form><input type="checkbox" /></form> $("input[@type='checkbox']").parent().is("form") true Returns false, because the parent of the input is a p element <form><input type="checkbox" /></form> $("input[@type='checkbox']").parent().is("form") false An invalid expression always returns false. <form></form> $("form").is(null) false The function doing the DOM manipulation. Extends the jQuery object itself. Can be used to add functions into the jQuery namespace and to add plugin methods (plugins). The object that will be merged into the jQuery 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; }
});

Extend one object with one or more others, returning the original, modified, object. This is a great utility for simple inheritance. The object to extend The object that will be merged into the first. (optional) More objects to merge into the first 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 object, or array, to iterate over. The function that will be executed on every 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){
  alert( "Item #" + i + ": " + this );
});

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){
  alert( "Name: " + i + ", Value: " + this );
});

Remove the whitespace from the beginning and end of a string. The string to trim. $.trim(" hello, how are you? "); "hello, how are you?" All ancestors of a given element. The element to find the ancestors of. All elements on a specified axis. The element to find all the siblings of (including itself). Merge two arrays together, removing all duplicates. The final order or the new array is: All the results from the first array, followed by the unique results from the second array. The first array to merge. The second array to merge. $.merge( [0,1,2], [2,3,4] ) [0,1,2,3,4] $.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 should return 'true' if you wish to keep the item in the array, false if it should be removed. The Array to find items in. The function to process each item against. Invert the selection - select the opposite of the function.

$.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. The Array to translate. The function to process each item against.

$.map( [0,1,2], function(i){
  return i + 4;
});

[4, 5, 6]

$.map( [0,1,2], function(i){
  return i > 0 ? i + 1 : null;
});

[2, 3]

$.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. 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!"); } ); } 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. A jQuery expression of elements to match. $("p").appendTo("#foo"); <div id="foo">I would like to say: </div> I would like to say: <div id="foo"></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. A jQuery expression of elements to match. $("p").prependTo("#foo"); <div id="foo">I would like to say: Hello</div> I would like to say: <div id="foo">Hello</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. A jQuery expression of elements to match. $("p").insertBefore("#foo"); I would like to say: <div id="foo">Hello</div> <div id="foo">Hello</div>I would like to say: 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. A jQuery expression of elements to match. $("p").insertAfter("#foo"); <div id="foo">Hello</div>I would like to say: I would like to say: <div id="foo">Hello</div> Get the current CSS width of the first matched element. $("p").width(); "300px" This is just a test. Set the CSS width of every matched element. Be sure to include the "px" (or other unit of measurement) after the number that you specify, otherwise you might get strange results. Set the CSS property to the specified value. $("p").width("20px"); This is just a test. This is just a test. Get the current CSS height of the first matched element. $("p").height(); "14px" This is just a test. Set the CSS height of every matched element. Be sure to include the "px" (or other unit of measurement) after the number that you specify, otherwise you might get strange results. Set the CSS property to the specified value. $("p").height("20px"); This is just a test. This is just a test. Get the current CSS top of the first matched element. $("p").top(); "0px" This is just a test. Set the CSS top of every matched element. Be sure to include the "px" (or other unit of measurement) after the number that you specify, otherwise you might get strange results. Set the CSS property to the specified value. $("p").top("20px"); This is just a test. This is just a test. Get the current CSS left of the first matched element. $("p").left(); "0px" This is just a test. Set the CSS left of every matched element. Be sure to include the "px" (or other unit of measurement) after the number that you specify, otherwise you might get strange results. Set the CSS property to the specified value. $("p").left("20px"); This is just a test. This is just a test. Get the current CSS position of the first matched element. $("p").position(); "static" This is just a test. Set the CSS position of every matched element. Set the CSS property to the specified value. $("p").position("relative"); This is just a test. This is just a test. Get the current CSS float of the first matched element. $("p").float(); "none" This is just a test. Set the CSS float of every matched element. Set the CSS property to the specified value. $("p").float("left"); This is just a test. This is just a test. Get the current CSS overflow of the first matched element. $("p").overflow(); "none" This is just a test. Set the CSS overflow of every matched element. Set the CSS property to the specified value. $("p").overflow("auto"); This is just a test. This is just a test. Get the current CSS color of the first matched element. $("p").color(); "black" This is just a test. Set the CSS color of every matched element. Set the CSS property to the specified value. $("p").color("blue"); This is just a test. This is just a test. Get the current CSS background of the first matched element. $("p").background(); "blue" This is just a test. Set the CSS background of every matched element. Set the CSS property to the specified value. $("p").background("blue"); This is just a test. This is just a test. 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. The index of the element that you wish to limit to. $("p").eq(1) [ So is this ] This is just a test.So is this 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. Reduce the set to all elements below this position. $("p").lt(1) [ This is just a test. ] This is just a test.So is this 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. Reduce the set to all elements after this position. $("p").gt(0) [ So is this ] This is just a test.So is this Filter the set of elements to those that contain the specified text. The string that will be contained within the text of an element. $("p").contains("test") [ This is just a test. ] This is just a test.So is this Get the current value of the first matched element. $("input").val(); "some text" <input type="text" value="some text"/> Set the value of every matched element. Set the property to the specified value. $("input").val("test"); <input type="text" value="test"/> <input type="text" value="some text"/> Get the html contents of the first matched element. $("div").html(); <input/> <div><input/></div> Set the html contents of every matched element. Set the html contents to the specified value. $("div").html("new stuff"); <div>new stuff</div> <div><input/></div> Get the current id of the first matched element. $("input").id(); "test" <input type="text" id="test" value="some text"/> Set the id of every matched element. Set the property to the specified value. $("input").id("newid"); <input type="text" id="newid" value="some text"/> <input type="text" id="test" value="some text"/> Get the current title of the first matched element. $("img").title(); "my image" <img src="test.jpg" title="my image"/> Set the title of every matched element. Set the property to the specified value. $("img").title("new title"); <img src="test.jpg" title="new image"/> <img src="test.jpg" title="my image"/> Get the current name of the first matched element. $("input").name(); "username" <input type="text" name="username"/> Set the name of every matched element. Set the property to the specified value. $("input").name("user"); <input type="text" name="user"/> <input type="text" name="username"/> Get the current href of the first matched element. $("a").href(); "test.html" <a href="test.html">my link</a> Set the href of every matched element. Set the property to the specified value. $("a").href("test2.html"); <a href="test2.html">my link</a> <a href="test.html">my link</a> Get the current src of the first matched element. $("img").src(); "test.jpg" <img src="test.jpg" title="my image"/> Set the src of every matched element. Set the property to the specified value. $("img").src("test2.jpg"); <img src="test2.jpg" title="my image"/> <img src="test.jpg" title="my image"/> Get the current rel of the first matched element. $("a").rel(); "nofollow" <a href="test.html" rel="nofollow">my link</a> Set the rel of every matched element. Set the property to the specified value. $("a").rel("nofollow"); <a href="test.html" rel="nofollow">my link</a> <a href="test.html">my link</a> Get a set of elements containing the unique parents of the matched set of elements. $("p").parent() [ <div>HelloHello</div> ] <div>HelloHello</div> Get a set of elements containing the unique parents of the matched set of elements, and filtered by an expression. An expression to filter the parents with $("p").parent(".selected") [ <div class="selected">Hello Again</div> ] <div>Hello</div><div class="selected">Hello Again</div> Get a set of elements containing the unique ancestors of the matched set of elements (except for the root element). $("span").ancestors() [ <body>...</body>, <div>...</div>, Hello ] <html><body><div>HelloHello Again</div></body></html> Get a set of elements containing the unique ancestors of the matched set of elements, and filtered by an expression. An expression to filter the ancestors with $("span").ancestors("p") [ Hello ] <html><body><div>HelloHello Again</div></body></html> Get a set of elements containing the unique ancestors of the matched set of elements (except for the root element). $("span").ancestors() [ <body>...</body>, <div>...</div>, Hello ] <html><body><div>HelloHello Again</div></body></html> Get a set of elements containing the unique ancestors of the matched set of elements, and filtered by an expression. An expression to filter the ancestors with $("span").ancestors("p") [ Hello ] <html><body><div>HelloHello Again</div></body></html> 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. $("p").next() [ Hello Again, <div>And Again</div> ] HelloHello Again<div>And Again</div> Get a set of elements containing the unique next siblings of each of the matched set of elements, and filtered by an expression. It only returns the very next sibling, not all next siblings. An expression to filter the next Elements with $("p").next(".selected") [ Hello Again ] HelloHello Again<div>And Again</div> Get a set of elements containing the unique previous siblings of each of the matched set of elements. It only returns the immediately previous sibling, not all previous siblings. $("p").prev() [ <div>Hello Again</div> ] Hello<div>Hello Again</div>And Again Get a set of elements containing the unique previous siblings of each of the matched set of elements, and filtered by an expression. It only returns the immediately previous sibling, not all previous siblings. An expression to filter the previous Elements with $("p").prev(".selected") [ <div>Hello</div> ] <div>Hello</div>Hello AgainAnd Again Get a set of elements containing all of the unique siblings of each of the matched set of elements. $("div").siblings() [ Hello, And Again ] Hello<div>Hello Again</div>And Again Get a set of elements containing all of the unique siblings of each of the matched set of elements, and filtered by an expression. An expression to filter the sibling Elements with $("div").siblings(".selected") [ Hello Again ] <div>Hello</div>Hello AgainAnd Again Get a set of elements containing all of the unique children of each of the matched set of elements. $("div").children() [ Hello Again ] Hello<div>Hello Again</div>And Again Get a set of elements containing all of the unique children of each of the matched set of elements, and filtered by an expression. An expression to filter the child Elements with $("div").children(".selected") [ Hello Again ] <div>HelloHello AgainAnd Again</div> Remove an attribute from each of the matched elements. The name of the attribute to remove. $("input").removeAttr("disabled") <input/> <input disabled="disabled"/> Displays each of the set of matched elements if they are hidden. $("p").show() [ Hello ] Hello Hides each of the set of matched elements if they are shown. $("p").hide() [ Hello ] var pass = true, div = $("div"); div.hide().each(function(){ if ( this.style.display != "none" ) pass = false; }); ok( pass, "Hide" ); Hello Toggles each of the set of matched elements. If they are shown, toggle makes them hidden. If they are hidden, toggle makes them shown. $("p").toggle() [ Hello, Hello Again ] HelloHello Again Adds the specified class to each of the set of matched elements. A CSS class to add to the elements $("p").addClass("selected") [ Hello ] Hello Removes the specified class from the set of matched elements. A CSS class to remove from the elements $("p").removeClass("selected") [ Hello ] Hello Adds the specified class if it is not present, removes it if it is present. A CSS class with which to toggle the elements $("p").toggleClass("selected") [ Hello, Hello Again ] HelloHello Again Removes all matched elements from the DOM. This does NOT remove them from the jQuery object, allowing you to use the matched elements further. $("p").remove(); how are Hello how are you? Removes only elements (out of the list of matched elements) that match the specified jQuery expression. This does NOT remove them from the jQuery object, allowing you to use the matched elements further. A jQuery expression to filter elements by. $("p").remove(".hello"); how are you? Hello how are you? Removes all child nodes from the set of matched elements. $("p").empty() [ ] Hello, Person <a href="#">and person</a> 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. An event type A function to bind to the event on each of the set of matched elements

$("p").bind( "click", function() {
  alert( $(this).text() );
} )

alert("Hello") Hello 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();
} )

The opposite of bind, removes a bound event from each of the matched elements. You must pass the identical function that was used in the original bind method. An event type A function to unbind from the event on each of the set of matched elements $("p").unbind( "click", function() { alert("Hello"); } ) [ Hello ] Hello Removes all bound events of a particular type from each of the matched elements. An event type $("p").unbind( "click" ) [ Hello ] Hello Removes all bound events from each of the matched elements. $("p").unbind() [ Hello ] Hello Trigger a type of event on every matched element. An event type to trigger. $("p").trigger("click") alert('hello') 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. The function to execute on every even click. The function to execute on every odd click.

$("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). The function to fire whenever the mouse is moved over a matched element. The function to fire whenever the mouse is moved off of a matched element.

$("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 function to be executed when the DOM is ready. $(document).ready(function(){ Your code here... }); Bind a function to the scroll event of each matched element. A function to bind to the scroll event on each of the matched elements. $("p").scroll( function() { alert("Hello"); } ); Hello Hello Trigger the scroll event of each matched element. This causes all of the functions that have been bound to thet scroll event to be executed. $("p").scroll(); alert('Hello'); Hello Bind a function to the scroll event of each matched element, which will only be executed once. Unlike a call to the normal .scroll() method, calling .onescroll() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the scroll event on each of the matched elements. $("p").onescroll( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first scroll Hello Removes a bound scroll event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the scroll event on each of the matched elements. $("p").unscroll( myFunction ); Hello Hello Removes all bound scroll events from each of the matched elements. $("p").unscroll(); Hello Hello Bind a function to the submit event of each matched element. A function to bind to the submit event on each of the matched elements. 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(); Triggers all submit events registered for forms, but does not submit the form $("form").submit(); Bind a function to the submit event of each matched element, which will only be executed once. Unlike a call to the normal .submit() method, calling .onesubmit() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the submit event on each of the matched elements. $("p").onesubmit( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first submit Hello Removes a bound submit event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the submit event on each of the matched elements. $("p").unsubmit( myFunction ); Hello Hello Removes all bound submit events from each of the matched elements. $("p").unsubmit(); Hello Hello Bind a function to the focus event of each matched element. A function to bind to the focus event on each of the matched elements. $("p").focus( function() { alert("Hello"); } ); Hello Hello 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. $("p").focus(); alert('Hello'); Hello Bind a function to the focus event of each matched element, which will only be executed once. Unlike a call to the normal .focus() method, calling .onefocus() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the focus event on each of the matched elements. $("p").onefocus( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first focus Hello Removes a bound focus event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the focus event on each of the matched elements. $("p").unfocus( myFunction ); Hello Hello Removes all bound focus events from each of the matched elements. $("p").unfocus(); Hello Hello Bind a function to the keydown event of each matched element. A function to bind to the keydown event on each of the matched elements. $("p").keydown( function() { alert("Hello"); } ); Hello Hello Trigger the keydown event of each matched element. This causes all of the functions that have been bound to thet keydown event to be executed. $("p").keydown(); alert('Hello'); Hello Bind a function to the keydown event of each matched element, which will only be executed once. Unlike a call to the normal .keydown() method, calling .onekeydown() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the keydown event on each of the matched elements. $("p").onekeydown( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first keydown Hello Removes a bound keydown event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the keydown event on each of the matched elements. $("p").unkeydown( myFunction ); Hello Hello Removes all bound keydown events from each of the matched elements. $("p").unkeydown(); Hello Hello Bind a function to the dblclick event of each matched element. A function to bind to the dblclick event on each of the matched elements. $("p").dblclick( function() { alert("Hello"); } ); Hello Hello Trigger the dblclick event of each matched element. This causes all of the functions that have been bound to thet dblclick event to be executed. $("p").dblclick(); alert('Hello'); Hello Bind a function to the dblclick event of each matched element, which will only be executed once. Unlike a call to the normal .dblclick() method, calling .onedblclick() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the dblclick event on each of the matched elements. $("p").onedblclick( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first dblclick Hello Removes a bound dblclick event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the dblclick event on each of the matched elements. $("p").undblclick( myFunction ); Hello Hello Removes all bound dblclick events from each of the matched elements. $("p").undblclick(); Hello Hello Bind a function to the keypress event of each matched element. A function to bind to the keypress event on each of the matched elements. $("p").keypress( function() { alert("Hello"); } ); Hello Hello Trigger the keypress event of each matched element. This causes all of the functions that have been bound to thet keypress event to be executed. $("p").keypress(); alert('Hello'); Hello Bind a function to the keypress event of each matched element, which will only be executed once. Unlike a call to the normal .keypress() method, calling .onekeypress() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the keypress event on each of the matched elements. $("p").onekeypress( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first keypress Hello Removes a bound keypress event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the keypress event on each of the matched elements. $("p").unkeypress( myFunction ); Hello Hello Removes all bound keypress events from each of the matched elements. $("p").unkeypress(); Hello Hello Bind a function to the error event of each matched element. A function to bind to the error event on each of the matched elements. $("p").error( function() { alert("Hello"); } ); Hello Hello Trigger the error event of each matched element. This causes all of the functions that have been bound to thet error event to be executed. $("p").error(); alert('Hello'); Hello Bind a function to the error event of each matched element, which will only be executed once. Unlike a call to the normal .error() method, calling .oneerror() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the error event on each of the matched elements. $("p").oneerror( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first error Hello Removes a bound error event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the error event on each of the matched elements. $("p").unerror( myFunction ); Hello Hello Removes all bound error events from each of the matched elements. $("p").unerror(); Hello Hello Bind a function to the blur event of each matched element. A function to bind to the blur event on each of the matched elements. $("p").blur( function() { alert("Hello"); } ); Hello Hello 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. $("p").blur(); alert('Hello'); Hello Bind a function to the blur event of each matched element, which will only be executed once. Unlike a call to the normal .blur() method, calling .oneblur() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the blur event on each of the matched elements. $("p").oneblur( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first blur Hello Removes a bound blur event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the blur event on each of the matched elements. $("p").unblur( myFunction ); Hello Hello Removes all bound blur events from each of the matched elements. $("p").unblur(); Hello Hello Bind a function to the load event of each matched element. A function to bind to the load event on each of the matched elements. $("p").load( function() { alert("Hello"); } ); Hello Hello Trigger the load event of each matched element. This causes all of the functions that have been bound to thet load event to be executed. Marked as private: Calling load() without arguments throws exception because the ajax load does not handle it. $("p").load(); alert('Hello'); Hello Bind a function to the load event of each matched element, which will only be executed once. Unlike a call to the normal .load() method, calling .oneload() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the load event on each of the matched elements. $("p").oneload( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first load Hello Removes a bound load event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the load event on each of the matched elements. $("p").unload( myFunction ); Hello Hello Removes all bound load events from each of the matched elements. $("p").unload(); Hello Hello Bind a function to the select event of each matched element. A function to bind to the select event on each of the matched elements. $("p").select( function() { alert("Hello"); } ); Hello Hello 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. $("p").select(); alert('Hello'); Hello Bind a function to the select event of each matched element, which will only be executed once. Unlike a call to the normal .select() method, calling .oneselect() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the select event on each of the matched elements. $("p").oneselect( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first select Hello Removes a bound select event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the select event on each of the matched elements. $("p").unselect( myFunction ); Hello Hello Removes all bound select events from each of the matched elements. $("p").unselect(); Hello Hello Bind a function to the mouseup event of each matched element. A function to bind to the mouseup event on each of the matched elements. $("p").mouseup( function() { alert("Hello"); } ); Hello Hello Trigger the mouseup event of each matched element. This causes all of the functions that have been bound to thet mouseup event to be executed. $("p").mouseup(); alert('Hello'); Hello Bind a function to the mouseup event of each matched element, which will only be executed once. Unlike a call to the normal .mouseup() method, calling .onemouseup() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the mouseup event on each of the matched elements. $("p").onemouseup( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first mouseup Hello Removes a bound mouseup event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the mouseup event on each of the matched elements. $("p").unmouseup( myFunction ); Hello Hello Removes all bound mouseup events from each of the matched elements. $("p").unmouseup(); Hello Hello Bind a function to the unload event of each matched element. A function to bind to the unload event on each of the matched elements. $("p").unload( function() { alert("Hello"); } ); Hello Hello Trigger the unload event of each matched element. This causes all of the functions that have been bound to thet unload event to be executed. $("p").unload(); alert('Hello'); Hello Bind a function to the unload event of each matched element, which will only be executed once. Unlike a call to the normal .unload() method, calling .oneunload() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the unload event on each of the matched elements. $("p").oneunload( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first unload Hello Removes a bound unload event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the unload event on each of the matched elements. $("p").ununload( myFunction ); Hello Hello Removes all bound unload events from each of the matched elements. $("p").ununload(); Hello Hello Bind a function to the change event of each matched element. A function to bind to the change event on each of the matched elements. $("p").change( function() { alert("Hello"); } ); Hello Hello Trigger the change event of each matched element. This causes all of the functions that have been bound to thet change event to be executed. $("p").change(); alert('Hello'); Hello Bind a function to the change event of each matched element, which will only be executed once. Unlike a call to the normal .change() method, calling .onechange() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the change event on each of the matched elements. $("p").onechange( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first change Hello Removes a bound change event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the change event on each of the matched elements. $("p").unchange( myFunction ); Hello Hello Removes all bound change events from each of the matched elements. $("p").unchange(); Hello Hello Bind a function to the mouseout event of each matched element. A function to bind to the mouseout event on each of the matched elements. $("p").mouseout( function() { alert("Hello"); } ); Hello Hello Trigger the mouseout event of each matched element. This causes all of the functions that have been bound to thet mouseout event to be executed. $("p").mouseout(); alert('Hello'); Hello Bind a function to the mouseout event of each matched element, which will only be executed once. Unlike a call to the normal .mouseout() method, calling .onemouseout() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the mouseout event on each of the matched elements. $("p").onemouseout( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first mouseout Hello Removes a bound mouseout event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the mouseout event on each of the matched elements. $("p").unmouseout( myFunction ); Hello Hello Removes all bound mouseout events from each of the matched elements. $("p").unmouseout(); Hello Hello Bind a function to the keyup event of each matched element. A function to bind to the keyup event on each of the matched elements. $("p").keyup( function() { alert("Hello"); } ); Hello Hello Trigger the keyup event of each matched element. This causes all of the functions that have been bound to thet keyup event to be executed. $("p").keyup(); alert('Hello'); Hello Bind a function to the keyup event of each matched element, which will only be executed once. Unlike a call to the normal .keyup() method, calling .onekeyup() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the keyup event on each of the matched elements. $("p").onekeyup( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first keyup Hello Removes a bound keyup event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the keyup event on each of the matched elements. $("p").unkeyup( myFunction ); Hello Hello Removes all bound keyup events from each of the matched elements. $("p").unkeyup(); Hello Hello Bind a function to the click event of each matched element. A function to bind to the click event on each of the matched elements. $("p").click( function() { alert("Hello"); } ); Hello Hello 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. $("p").click(); alert('Hello'); Hello Bind a function to the click event of each matched element, which will only be executed once. Unlike a call to the normal .click() method, calling .oneclick() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the click event on each of the matched elements. $("p").oneclick( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first click Hello Removes a bound click event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the click event on each of the matched elements. $("p").unclick( myFunction ); Hello Hello Removes all bound click events from each of the matched elements. $("p").unclick(); Hello Hello Bind a function to the resize event of each matched element. A function to bind to the resize event on each of the matched elements. $("p").resize( function() { alert("Hello"); } ); Hello Hello Trigger the resize event of each matched element. This causes all of the functions that have been bound to thet resize event to be executed. $("p").resize(); alert('Hello'); Hello Bind a function to the resize event of each matched element, which will only be executed once. Unlike a call to the normal .resize() method, calling .oneresize() causes the bound function to be only executed the first time it is triggered, and never again (unless it is re-bound). A function to bind to the resize event on each of the matched elements. $("p").oneresize( function() { alert("Hello"); } ); alert('Hello'); // Only executed for the first resize Hello Removes a bound resize event from each of the matched elements. You must pass the identical function that was used in the original bind method. A function to unbind from the resize event on each of the matched elements. $("p").unresize( myFunction ); Hello <p onresize="myFuncti