$(“[href$='.jpg']“) All elements with an href attribute that ends with “.jpg”
$(“div#intro .head”) All elements with class=”head” inside a element with id=”intro”

jQuery Name Conflicts
jQuery uses the $ sign as a shortcut for jQuery.
Some other JavaScript libraries also use the dollar sign for their functions.
The jQuery noConflict() method specifies a custom name (like jq), instead of using the dollar sign.

jQuery Events
Here are some examples of event methods in jQuery:
Event Method Description
$(document).ready(function) Binds a function to the ready event of a document
(when the document is finished loading)
$(selector).click(function) Triggers, or binds a function to the click event of selected elements
$(selector).dblclick(function) Triggers, or binds a function to the double click event of selected elements
$(selector).focus(function) Triggers, or binds a function to the focus event of selected elements
$(selector).mouseover(function) Triggers, or binds a function to the mouseover event of selected elements

jQuery Effects
Here are some examples of effect functions in jQuery:
Function Description
$(selector).hide() Hide selected elements
$(selector).show() Show selected elements
$(selector).toggle() Toggle (between hide and show) selected elements
$(selector).slideDown() Slide-down (show) selected elements
$(selector).slideUp() Slide-up (hide) selected elements
$(selector).slideToggle() Toggle slide-up and slide-down of selected elements
$(selector).fadeIn() Fade in selected elements
$(selector).fadeOut() Fade out selected elements
$(selector).fadeTo() Fade out selected elements to a given opacity
$(selector).animate() Run a custom animation on selected elements

jQuery HTML Manipulation

jQuery contains powerful methods (functions) for changing and manipulating HTML elements and attributes.
________________________________________
Changing HTML Content
$(selector).html(content)
The html() method changes the contents (innerHTML) of matching HTML elements.
Example
$(“p”).html(“W3Schools”);

jQuery HTML Manipulation Methods From This Page:
Function Description
$(selector).html(content) Changes the (inner) HTML of selected elements
$(selector).append(content) Appends content to the (inner) HTML of selected elements
$(selector).after(content) Adds HTML after selected elements

jQuery CSS Methods From this Page:
CSS Properties Description
$(selector).css(name) Get the style property value of the first matched element
$(selector).css(name,value) Set the value of one style property for matched elements
$(selector).css({properties}) Set multiple style properties for matched elements
$(selector).height(value) Set the height of matched elements
$(selector).width(value) Set the width of matched elements

jQuery Selectors
Use our excellent jQuery Selector Tester to experiment with the different selectors.
Selector Example Selects
*
$(“*”) All elements
#id
$(“#lastname”) The element with id=lastname
.class
$(“.intro”) All elements with class=”intro”
element
$(“p”) All p elements
.class.class $(“.intro.demo”) All elements with the classes “intro” and “demo”

:first
$(“p:first”) The first p element
:last
$(“p:last”) The last p element
:even
$(“tr:even”) All even tr elements
dd
$(“tr:odd”) All odd tr elements

:eq(index)
$(“ul li:eq(3)”) The fourth element in a list (index starts at 0)
:gt(no)
$(“ul li:gt(3)”) List elements with an index greater than 3
:lt(no)
$(“ul li:lt(3)”) List elements with an index less than 3
:not(selector)
$(“input:not(:empty)”) All input elements that are not empty

:header
$(“:header”) All header elements h1, h2 …
:animated
$(“:animated”) All animated elements

:contains(text)
$(“:contains(‘W3Schools’)”) All elements which contains the text
:empty
$(“:empty”) All elements with no child (elements) nodes
:hidden $(“p:hidden”) All hidden p elements
:visible
$(“table:visible”) All visible tables

s1,s2,s3 $(“th,td,.intro”) All elements with matching selectors

[attribute]
$(“[href]“) All elements with a href attribute
[attribute=value]
$(“[href='default.htm']“) All elements with a href attribute value equal to “default.htm”
[attribute!=value]
$(“[href!='default.htm']“) All elements with a href attribute value not equal to “default.htm”
[attribute$=value]
$(“[href$='.jpg']“) All elements with a href attribute value ending with “.jpg”

:input
$(“:input”) All input elements
:text
$(“:text”) All input elements with type=”text”
:password
$(“:password”) All input elements with type=”password”
:radio
$(“:radio”) All input elements with type=”radio”
:checkbox
$(“:checkbox”) All input elements with type=”checkbox”
:submit
$(“:submit”) All input elements with type=”submit”
:reset
$(“:reset”) All input elements with type=”reset”
:button
$(“:button”) All input elements with type=”button”
:image
$(“:image”) All input elements with type=”image”
:file
$(“:file”) All input elements with type=”file”

:enabled
$(“:enabled”) All enabled input elements
:disabled
$(“:disabled”) All disabled input elements
:selected
$(“:selected”) All selected input elements
:checked
$(“:checked”) All checked input elements

jQuery Event Methods
Event methods trigger, or bind a function to an event for all matching elements.
Trigger example:
$(“button”).click() – triggers the click event for a button element.
Binding example:
$(“button”).click(function(){$(“img”).hide()}) – binds a function to the click event.
The following table lists all the methods used to handle events.
Method Description
bind()
Add one or more event handlers to matching elements
blur()
Triggers, or binds a function to the blur event of selected elements
change()
Triggers, or binds a function to the change event of selected elements
click()
Triggers, or binds a function to the click event of selected elements
dblclick()
Triggers, or binds a function to the dblclick event of selected elements
delegate()
Add one or more event handlers to current, or future, specified child elements of the matching elements
die()
Remove all event handlers added with the live() function
error()
Triggers, or binds a function to the error event of selected elements
event.currentTarget The current DOM element within the event bubbling phase
event.data Contains the optional data passed to jQuery.fn.bind when the current executing handler was bound
event.isDefaultPrevented()
Returns whether event.preventDefault() was called for the event object
event.isImmediatePropagationStopped() Returns whether event.stopImmediatePropagation() was called for the event object
event.isPropagationStopped() Returns whether event.stopPropagation() was called for the event object
event.pageX
The mouse position relative to the left edge of the document
event.pageY
The mouse position relative to the top edge of the document
event.preventDefault()
Prevents the default action of the event
event.relatedTarget The other DOM element involved in the event, if any
event.result
This attribute contains the last value returned by an event handler that was triggered by this event, unless the value was undefined
event.stopImmediatePropagation() Prevents other event handlers from being called
event.stopPropagation() Prevents the event from bubbling up the DOM tree, preventing any parent handlers from being notified of the event
event.target
The DOM element that initiated the event
event.timeStamp
This attribute returns the number of milliseconds since January 1, 1970, when the event is triggered
event.type
Describes the nature of the event
event.which
Which key or button was pressed for a key or button event
focus()
Triggers, or binds a function to the focus event of selected elements
focusin()
Binds a function to the focusin event of selected elements
focusout()
Binds a function to the focusout event of selected elements
hover()
Binds one or two functions to the hover event of selected elements
keydown()
Triggers, or binds a function to the keydown event of selected elements
keypress()
Triggers, or binds a function to the keypress event of selected elements
keyup()
Triggers, or binds a function to the keyup event of selected elements
live()
Add one or more event handlers to current, or future, matching elements
load()
Triggers, or binds a function to the load event of selected elements
mousedown()
Triggers, or binds a function to the mouse down event of selected elements
mouseenter()
Triggers, or binds a function to the mouse enter event of selected elements
mouseleave()
Triggers, or binds a function to the mouse leave event of selected elements
mousemove()
Triggers, or binds a function to the mouse move event of selected elements
mouseout()
Triggers, or binds a function to the mouse out event of selected elements
mouseover()
Triggers, or binds a function to the mouse over event of selected elements
mouseup()
Triggers, or binds a function to the mouse up event of selected elements
one()
Add one or more event handlers to matching elements. This handler can only be triggered once per element
ready()
Binds a function to the ready event of a document
(when an HTML document is ready to use)
resize()
Triggers, or binds a function to the resize event of selected elements
scroll()
Triggers, or binds a function to the scroll event of selected elements
select()
Triggers, or binds a function to the select event of selected elements
submit()
Triggers, or binds a function to the submit event of selected elements
toggle()
Binds two or more functions to the toggle between for the click event for selected elements
trigger()
Triggers all events bound to the selected elements
triggerHandler()
Triggers all functions bound to a specified event for the selected elements
unbind()
Remove an added event handler from selected elements
undelegate()
Remove an event handler to selected elements, now or in the future
unload()
Triggers, or binds a function to the unload event of selected elements

jQuery Effect Methods
The following table lists all the methods used to create animation effects.
Method Description
animate()
Performs a custom animation (of a set of CSS properties) for selected elements
clearQueue()
Removes all queued functions for the selected element
delay() Sets a delay for all queued functions for the selected element
dequeue() Runs the next queued functions for the selected element
fadeIn()
Gradually changes the opacity, for selected elements, from hidden to visible
fadeOut()
Gradually changes the opacity, for selected elements, from visible to hidden
fadeTo()
Gradually changes the opacity, for selected elements, to a specified opacity
fadeToggle()
hide()
Hides selected elements
queue() Shows the queued functions for the selected element
show()
Shows hidden selected elements
slideDown()
Gradually changes the height, for selected elements, from hidden to visible
slideToggle()
Toggles between slideUp() and slideDown() for selected elements
slideUp()
Gradually changes the height, for selected elements, from visible to hidden
stop()
Stops a running animation on selected elements
toggle()
Toggles between hide() and show(), or custom functions, for selected elements

jQuery HTML Methods
The following table lists all the methods used to manipulate the DOM.
The methods below work for both HTML and XML documents. Exception: the html() method.
Method Description
addClass()
Adds one or more classes (for CSS) to selected elements
after()
Inserts content after selected elements
append()
Inserts content at the end of (but still inside) selected elements
appendTo()
Inserts content at the end of (but still inside) selected elements
attr()
Sets or returns an attribute and value of selected elements
before()
Inserts content before selected elements
clone()
Makes a copy of selected elements
detach()
Removes (but keeps a copy of) selected elements
empty()
Removes all child elements and content from selected elements
hasClass()
Checks if any of the selected elements have a specified class (for CSS)
html()
Sets or returns the content of selected elements
insertAfter()
Inserts HTML markup or elements after selected elements
insertBefore()
Inserts HTML markup or elements before selected elements
prepend()
Inserts content at the beginning of (but still inside) selected elements
prependTo()
Inserts content at the beginning of (but still inside) selected elements
remove()
Removes selected elements
removeAttr()
Removes an attribute from selected elements
removeClass()
Removes one or more classes (for CSS) from selected elements
replaceAll()
Replaces selected elements with new content
replaceWith()
Replaces selected elements with new content
text()
Sets or returns the text content of selected elements
toggleClass()
Toggles between adding/removing one or more classes (for CSS) from selected elements
unwrap()
Removes the parent element of the selected elements
val()
Sets or returns the value attribute of the selected elements (form elements)
wrap()
Wraps specified HTML element(s) around each selected element
wrapAll()
Wraps specified HTML element(s) around all selected elements
wrapInner()
Wraps specified HTML element(s) around the content of each selected element

jQuery CSS Methods
The following table lists all the methods used to manipulate CSS properties.
Method Description
addClass()
Adds one or more classes to selected elements
css()
Sets or returns one or more style properties for selected elements
hasClass()
Checks if any of the selected elements have a specified class
height()
Sets or returns the height of selected elements
offset()
Sets or returns the position (relative to the document) for selected elements
offsetParent()
Returns the first parent element that is positioned
position()
Returns the position (relative to the parent element) of the first selected element
removeClass()
Removes one or more classes from selected elements
scrollLeft()
Sets or returns the horizontal position of the scrollbar for the selected elements
scrollTop()
Sets or returns the vertical position of the scrollbar for the selected elements
toggleClass()
Toggles between adding/removing one or more classes from selected elements
width()
Sets or returns the width of selected elements

jQuery AJAX Methods
AJAX is the art of exchanging data with a server, and update parts of a web page – without reloading the whole page.
The following table lists all the jQuery AJAX methods:
Method Description
$.ajax()
Performs an AJAX request
ajaxComplete()
Specifies a function to run when the AJAX request completes
ajaxError()
Specifies a function to run when the AJAX request completes with an error
ajaxSend()
Specifies a function to run before the AJAX request is sent
$.ajaxSetup()
Sets the default values for future AJAX requests
ajaxStart()
Specifies a function to run when the first AJAX request begins
ajaxStop()
Specifies a function to run when all AJAX requests have completed
ajaxSuccess()
Specifies a function to run an AJAX request completes successfully
$.get()
Loads data from a server using an AJAX HTTP GET request
$.getJSON()
Loads JSON-encoded data from a server using a HTTP GET request
$.getScript()
Loads (and executes) a JavaScript from the a server using an AJAX HTTP GET request
load()
Loads data from a server and puts the returned HTML into the selected element
$.param()
Creates a serialized representation of an array or object (can be used as URL query string for AJAX requests)
$.post()
Loads data from a server using an AJAX HTTP POST request
serialize()
Encodes a set of form elements as a string for submission
serializeArray()
Encodes a set of form elements as an array of names and values

jQuery Misc Methods
Method Description
data() : Attaches data to, or gets data from, selected elements
each() : Run a function for each element matched by the jQuery selector
get() : Get the DOM elements matched by the selector
index() : Search for a given element from among the matched elements
$.noConflict() : Release jQuery’s control of the $ variable
$.param() : Creates a serialized representation of an array or object (can be used as URL query string for AJAX requests)
removeData() : Removes a previously-stored piece of data
size() :Return the number of DOM elements matched by the jQuery selector
toArray() : Retrieve all the DOM elements contained in the jQuery set, as an array