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Quick Reference - jQuery

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Modified on Fri, Jan 17, 2014, 1:10 PM by Administrator Categorized as (Favorites), JavaScript, jQuery, and Angular, Quick Reference

Table of Contents [Hide/Show]

   Online Repositories
      jQuery
      jQuery UI
   Field Values
      Text, Hidden, and Password Fields
      DropDownList
      CheckBox
      Radio Button
   Page Element Properties
      Enable/Disable
      Visiblility
   Selectors
      General
      Children
      Attributes
      Form Selectors
      Special Selectors
   Common Functions

Online Repositories¶

jQuery¶

//ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js
//ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.2.min.js
//ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js

jQuery UI¶

//ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js
//ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/jquery-ui.min.js

Field Values¶

Text, Hidden, and Password Fields¶

Get Value	`$(selector).val()`
Set Value	`$(selector).val('newValue')`

DropDownList¶

Get Underlying Value	`$('select#id option:selected').val()`
Get Displayed Text	`$('select#id option:selected').html()`
Set Value	`$(selector).val('newValue')`
Clear Value	Not applicable. An HTML dropdown always has a value selected.

NOTE: When setting the value of a drop down list, and the value doesn't exist, the behavior is browser-dependent.

IE simply leaves the dropdown selection unchanged.
FF and Chrome revert to the first item in the list.

CheckBox¶

Get Value	`$(selector).is(':checked')`
Set Value	`$(selector).attr('checked', 'checked')`
Clear Value	`$(selector).removeAttr('checked')`

Radio Button¶

Get Value	`$('input:checked[name=MyName]).val()` OR `$(selector).is(':checked')`
Set Value	`$('input[name=MyName]').filter('[value=MyValue]').attr('checked', 'checked');`
Clear Value	`$('input[name=MyName]').removeAttr('checked');`

Page Element Properties¶

Enable/Disable¶

Get Value	`var enabled = !$(selector).attr('disabled');`
Set Enabled	`$(selector).removeAttr('disabled')`
Set Disabled	`$(selector).attr('disabled','disabled')`

Visiblility¶

Get Visibility	`$(selector).is(":visible")`
Set Visible	`$(selector).show()`
Set Invisible	`$(selector).hide()`

Selectors¶

General¶

Description	Example	Notes
By tag name	`$('div')`	Selects all `div` tags in the document
By ID	`$('#myId')`	Selects the unique element with `id='myId'`
By Class	`$('.MyClass')`	Selects all elements with the class `MyClass`
Adjacent Sibling	`$('selectorE + selectorF')`	Selects all elements matching `selectorF` that immediately follow an element matching `selectorE` and have the same parent
Adjacent Sibling	`$(selectorE).next('selectorF')`
General Sibling	`$('selectorE ~ selectorF')`	Selects all elements matching `selectorF` that follow an element matching `selectorE` and have the same parent
Multiple Expressions	`$('selectorE, selectorF')`	Selects all elements matching `selectorE` or `selectorF`
Boolean NOT	`$(':not(selectorE)')`	Selects all elements not matching `selectorE`
Empty	`$(':empty')`	Selects all elements that have no children, including text nodes

Children¶

Description	Example	Notes
Descendant	`$('selectorE selectorF')`	Selects all elements matching `selectorF` that are descendants (to all levels) of an element matching `selectorE`
Children	`$('selectorE > selectorF')`	Selects all elements matching `selectorF` that are immediate children (to one level) of an element matching `selectorE`
Numbered child (Nth)	`$('li:nth-child(2)')`	Selects all `li` elements that are the second child of their parent
Numbered child (even/odd)	`$('tr:nth-child(odd)')`	Selects all `tr` elements that are the odd-numbered child of their parent
Numbered child (expression)	`$('.myclass:nth-child(3n+2)')`	Selects all elements with the class `myclass` that are the (3n+2)th child of their parent (i.e., 2nd, 5th, 8th, etc.)
First Child	`$('li:first-child')`	Selects all `li` elements that are the first child of their parent; the same as `$('li:nth-child(1)')`
Last Child	`$('li:last-child')`	Selects all `li` elements that are the last child of their parent
Only child	`$('li:only-child')`	Selects all `li` elements that are the only child of their parent

Attributes¶

Description	Example	Notes
Existence	`$('[rel]')`	Selects all elements that have the `rel` attribute, with any value
Equality	`$('[rel=value]')`	Selects all elements that have the `rel` attribute with the specified `value`
Inequality	`$('[rel!=value]')`	Selects all elements that do not have the `rel` attribute, or have it with a something other than the `value` specified
Starts With	`$('[rel^=value]')`	Selects all elements that have the `rel` attribute with a value starting with `value`
Ends With	`$('[rel$=value]')`	Selects all elements that have the `rel` attribute with a value ending with `value`
Contains	`$('[rel*=value]')`	Selects all elements that have the `rel` attribute with a value containing `value`
Contains Word	`$('[rel~=value]')`	Selects all elements that have the `rel` attribute with a value containing with word `value` (i.e., delimited by spaces)
Contains Prefix	`$('[rel\|=value]')`	Selects all elements that have the `rel` attribute with a value either equal to `value`, or beginning with it and a hyphen

Form Selectors¶

Description	Example	Notes
Form element	`$(':input')`	Select all form elements: `input` (all types), `select`, `textarea`, `button`
Text fields	`$(':text')`	Selects all text fields: `<input type='text'/>`
Password fields	`$(':password')`	Selects all password fields: `<input type='password'/>`
Radio buttons	`$(':radio')`	Selects all radio buttons: `<input type='radio'/>`
Checkboxes	`$(':checkbox')`	Selects all checkboxes: `<input type='checkbox'/>`
Submit button	`$(':submit')`	Selects the submit button: `<input type='submit'/>`
Image button	`$(':image')`	Selects all image buttons: `<input type='image'/>`
Reset button	`$(':reset')`	Selects all reset buttons: `<input type='reset'/>`
Button	`$(':button')`	Selects all standard buttons: `<input type='button'/>`
File Upload	`$(':file')`	Selects all file uploads: `<input type='file'/>`
Enabled elements	`$(':enabled')`	Selects all elements that are enabled (i.e., that don't have a `disabled` attribute)
Disabled elements	`$(':disabled')`	Selects all elements that are disabled (i.e., that have a `disabled` attribute)
Checked Boxes	`$(':checked')`	Selects all elements (radio buttons and checkboxes) that are checked
Selected	`$(':selected')`	Selects all elements (i.e., `option` elements within a dropdown) that are selected

Special Selectors¶

Description	Example	Notes
Index Equality	`$(':eq(N)')`	Selects the element at index N (zero-based) within the matched set
Index Greater Than	`$(':gt(N)')`	Selects the element with an index (zero-based) greater than N within the matched set
Index Less Than	`$(':lt(N)')`	Selects the element with an index (zero-based) less than N within the matched set
First	`$(':first')`	Selects the first element within the matched set
Last	`$(':last')`	Selects the last element within the matched set
Even Elements	`$(':even')`	Selects the even-numbered (zero-based) element within the matched set
Odd Elements	`$(':odd')`	Selects the odd-numbered (zero-based) element within the matched set
Is Parent	`$(':parent')`	Selects all elements that are the parent of another, including text nodes
Contains Text	`$(':contains(value)')`	Selects all elements that contain `value`, either directly or within any descendant, or any combination thereof
Contains Element	`$(':has(selectorE)')`	Selects all elements that contain (at any level) an element matching `selectorE`
Visible	`$(':visible')`	Selects all visible elements
Hidden	`$(':hidden')`	Selects all hidden elements
Header Element	`$(':header')`	Selects all elements that are headers, such as `<h1>` or `<h2>`
Animation	`$(':animated')`	Selects all elements that are in the progress of an animation at the time the selector is run

Common Functions¶

All of these can be performed on a the result of a query, e.g., $(selector).append(content).

Function	Description
`.append(content)`	Inserts content at the end of the interior of the elements matched by the selector
`.children(selector)`	Gets the child nodes matching the (optional) selector
`.closest(selector)`	Gets the nearest ancestor matching the selector. Especially useful with the `'form'` selector.
`.each(function(index, item) { . . . } )`	Iterate — not to be confused with `$.each(collection, function(index, item){ . . . })`
`.eq(index)`	Select by index
`.filter(selector)`	Further drill-down the selection of element(s)
`.find(selector)`	Gets the descendants matching the selector
`.first()`	Get just the first element in the set
`.hasClass(class)`	Determine whether any of the matched elements are assigned the specified class.
`.html()`	Returns all the inner HTML (i.e., not including the HTML for the element itself) within the selected elements
`.last()`	Gets just the last element in the set
`.next(selector)`	Gets the immediately next sibling to each element in the set, optionally filtered by a selector
`.parent(selector)`	Gets the parent to each element in the set, optionally filtered by a selector
`.prepend(content)`	Inserts content at the beginning the interior of the elements matched by the selector
`.prev(selector)`	Gets the immediately previous sibling to each element in the set, optionally filtered by a selector
`.replaceWith(content)`	Replaces the elements matched by the selector with the content
`.toggle()`	Toggles the visibility of elements matched by the selector

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