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Hi, I’m jQuery++.

I am a MIT licensed collection of extremely useful DOM helpers and special events for jQuery 1.8 and later. I’m not a UI project like jQuery UI or jQuery Tools. Instead, I’m all about providing low-level utilities for things that jQuery doesn’t support. If Underscore is jQuery’s functional-programming tie, I am jQuery’s bald-spot covering toupee.

Select the plugins you want and click “Download” for a customized, unminified JavaScript file:

DOM HELPERS - faster and easier DOM manipulation with:

EVENTS - listen to special events with:

Learn more about how I can be useful to you. If you think I should have other utilities, let me know on the forum. If you like me, check out my sister library CanJS. Finally, my apologies about talking about myself in the third person from this point forward.

Get jQuery++

There are several ways to get and setup jQuery++:

  • using the download builder
  • using individual files
  • using Steal
  • using AMD

Using the download builder

Simply select the files you want and click “Download”. This will create and download a jquerypp.custom.js with all the files you selected and their dependencies. Load this script after jQuery 1.8 like:

<script src="lib/jquery.1.8.2.js"></script>
<script src="lib/jquerypp.custom.js"></script>

Using AMD

The files to load the jQuery++ plugins with an AMD module loader like RequireJS, are located in the amd/ folder of the full download. Place the jquerypp/ folder in your module directory and load a plugin like this:

define(['jquery', 'jquerypp/dimensions', 'jquerypp/event/resize'],
  function($) {

You might have to map the jquery module name to the name of your jQuery AMD module. In RequireJS like this:

  paths: {
    "jquery" : ""

Note: Starting at version 1.7 jQuery will define itself as an AMD module if a loader is available. There is no need to create a wrapper anymore.


animate $(el).animate(properties, [speed], [callback]) -> jQuery

Annotated source

jQuery.animate overwrites $.fn.animate to use CSS 3 animations if possible. It takes the same arguments as the original $.fn.animate and will fall back to jQuery’s JavaScript animation if a CSS animation is not possible.

A fade-in effect can be implemented like this:

  opacity : 0
  opacity : 1
}, 1000, function() {
  console.log('Animation done');

Since CSS transitions are implemented natively in the browser and can make use of hardware acceleration, animations will perform a lot better, especially in Webkit based mobile browsers (iPhone, iPad, Android).

compare $(elA).compare(elB) -> Number

Annotated source adds $ to compare the position of two nodes. It returns a number that represents a bitmask showing how they are positioned relative to each other. The following list shows the bitmask, the number and what it means for a $ call like $('#foo').compare($('#bar')):

  • 000000 -> 0: Elements are identical
  • 000001 -> 1: The nodes are in different documents (or one is outside of a document)
  • 000010 -> 2: #bar precedes #foo
  • 000100 -> 4: #foo precedes #bar
  • 001000 -> 8: #bar contains #foo
  • 010000 -> 16: #foo contains #bar

You can tell if #foo precedes #bar like:

if( $('#foo').compare($('#bar')) & 4 ) {
  console.log("#foo preceds #bar");

This is useful to rapidly compare element positions which is common when widgets can reorder themselves (drag-drop) or with nested widgets (trees). In the following example, select two elements to see how they compare to each other and what bitmask the result represents:

Annotated source

jQuery.cookie packages Klaus Hartl’s jQuery cookie plugin for manipulating cookies. Use it like:

// Set a session cookie
$.cookie('the_cookie', 'the_value');
$.cookie('the_cookie'); // -> 'the_value'
// Set a cookie that expires in 7 days
$.cookie('the_cookie', 'the_value', { expires: 7 });
// delete the cookie
$.cookie('the_cookie', null);

The following options are available:

  • expires - the expiration time in days or an expiry date
  • domain - the domain name
  • path - the value of the path for the cookie
  • secure - if the cookie requires HTTPS

The example uses jQuery.cookie and formParams to persist a form to a cookie. You can save the form or load it from the value stored in the cookie. At the bottom it shows the current cookie value after running it through decodeURIComponent:

formParams $(form).formParams([convert]) -> Object|jQuery

Annotated source

jQuery.formParams adds $.fn.formParams which serializes a form into a JavaScript object. It creates nested objects by using bracket notation in the form element name. If convert is true, values that look like numbers or booleans will be converted and empty strings won’t be added to the object. For a form like this:

  <input type="text" name="first" value="John" />
  <input type="text" name="last" value="Doe" />
  <input type="text" name="phone[mobile]" value="1234567890" />
  <input type="text" name="phone[home]" value="0987654321" />

$.fn.formParams returns:

// -> {
//   first : "John", last : "Doe",
//   phone : { mobile : "1234567890", home : "0987654321" }
// }

It is also possible to set form values by passing an object:

  first : 'Mike',
  last : 'Smith'

Update the form in the following example to see a JSON representation of the object returned by $.fn.formParams:

range $.Range([el]) -> range $(el).range() -> range

Annotated source

Use jQuery.Range to create, move and compare text ranges. Use $.Range.current() to get the currently selected text range. $(el).range() returns a text range on an element.

For example, for an element like <div id="text">This is some text</div>, $.Range can be used like this:

// Get a text range for #text
var range = $('#text').range();
// Move the start 5 characters to the right
// Move the end 5 characters to the left
// Return the range text
range.toString(); // is some
// Select the current range;

A $.Range instance offers the following methods:

The following example uses jQuery.range to

  • Show the start end end offset of the selection
  • Show the selected plain text
  • Add a green border on the left to the start element
  • Add a red border on the right to the end element
  • Put a dotted outline around the parent element

selection $(el).selection([start], [end]) -> Object|jQuery

Annotated source

jQuery.selection adds $.fn.selection to set or retrieve the currently selected text range. It works on all elements:

<div id="text">This is some text</div>
// Make a selection in #text from position eight to 12
$('#text').selection(8, 12);
var selection = $('#text').selection();
// -> { start : 8, end : 12 }
$('#text').text().substring(selection.start, selection.end) // -> some

The following example shows how $.fn.selection can be used. Initially the selection is set from position eight to 12. You can change the selection in the highlighted area and the status text will be updated:

within $(el).within(left, top, [useOffsetCache]) -> jQuery

Annotated source

jQuery.within adds $.fn.within and $.fn.withinBox that return all elements having a given position or area in common. The following example returns all div elements having the point 200px left and 200px from the top in common:

$('div').within(200, 200)

Use $(el).withinBox(left, top, width, height) to get all elements within a certain area:

$('*').withinBox(200, 200, 100, 100)

Move the mouse in the following example and it will show the ids for div elements within the current mouse position:

jQuery.event.drag uses jQuery.within to determine dropable elements at the current position.


removed removed

Annotated source

The destroyed event is triggered by jQuery.event.destroyed when the element is removed from the DOM using one of the jQuery manipulation methods.

$('form').on('destroyed', function() {
  // Clean up when a form element has been removed

Note: The destroyed event does not bubble.

drag dragdown draginit dragmove dragend dragover dragout

Annotated source

jQuery.event.drag adds delegatable drag events to jQuery:

  • dragdown - the mouse cursor is pressed down
  • draginit - the drag motion is started
  • dragmove - the drag is moved
  • dragend - the drag has ended
  • dragover - the drag is over a drop point
  • dragout - the drag moved out of a drop point

An element will become draggable by attaching an event listener for one of these events on it. A simple slider can be implemented like this:

$('#dragger').on('draginit', function(ev, drag) {

Which looks like this in action:

The drag object (passed to the event handler as the second parameter) can be used to modify the drag behavior:

drop dropinit dropover dropout dropmove dropon dropend

Annotated source

jQuery.event.drop complements jQuery.event.drag with delegatable drop events:

  • dropinit - the drag motion is started, drop positions are calculated
  • dropover - a drag moves over a drop element, called once as the drop is dragged over the element
  • dropout - a drag moves out of the drop element
  • dropmove - a drag is moved over a drop element, called repeatedly as the element is moved
  • dropon - a drag is released over a drop element
  • dropend - the drag motion has completed

The following example adds the highlight class when a drag is moved over the element and removes it when it leaves:

  "dropover" : function(ev, drop, drag){
  "dropout" : function(ev, drop, drag){

The drop object offers the following methods:

When adding drop-able elements after dropinit, for example when expanding a folder view after hovering over it with a draggable for a while, $.Drop.compile() needs to be called explicitly to update the list of dropable elements (this happens automatically on dropinit).

The following example shows two draggable elements and a drop area. When a drag starts it will create a copy of the element using drag.ghost(). The drop area will be highlighted when the drag moves over it and update the text when it is dropped:

hover hoverinit hoverenter hovermove hoverleave

Annotated source

jQuery.event.hover provides the following hover events:

  • hoverinit - called on mouseenter
  • hoverenter - an element is being hovered
  • hovermove - the mouse moves on an element that has been hovered
  • hoverleave - the mouse leaves the hovered element
  hoverenter : function(){
  hoverleave : function(){

An element is hovered when the mouse moves less than a certain distance in a specific time over the element. These values can be modified either globally by setting $.Hover.delay and $.Hover.distance or individually during hoverinit:

$(".option").on("hoverinit", function(ev, hover){
  //set the distance to 10px
  //set the delay to 200ms

You can also set hover.leave(time) to set a time that the hover should stay active for after the mouse left. The following example shows jQuery.event.hover with different settings for distance, delay and leave:

key event.keyName()

Annotated source

jQuery.event.key adds a .keyName() method to the event object that returns a string representation of the current key:

$("input").on('keypress', function(ev){
  // Don't allow backspace keys
  if(ev.keyName() == '\b') {
  if(ev.keyName() == 'f1') {
    alert('I could be a tooltip for help');

The following key names are mapped by default:

  • \b - backspace
  • \t - tab
  • \r - enter key
  • shift, ctrl, alt
  • pause-break, caps, escape, num-lock, scroll-loc, print
  • page-up, page-down, end, home, left, up, right, down, insert, delete
  • ' ' - space
  • 0-9 - number key pressed
  • a-z - alpha key pressed
  • num0-9 - number pad key pressed
  • f1-12 - function keys pressed
  • Symbols: /, ;, :, =, ,, -, ., /, [, \, ], ', "

The following example shows the keyname for keydown, keyup and keypress events on the input field:


jQuery.event.pause adds a default event handler, event.pause() and event.resume() for pausing and resuming event propagation and $.fn.triggerAsync for triggering an event asynchronously and executing a callback when propagation is finished.

This is very useful for creating event oriented jQuery widgets that provide default behavior for certain events. A widget user can intercept any of these events, pause it and perform other actions before resuming the default action or prevent it entirely.


The following example implements a tabs widget using CanJS. Each tab panel contains a form to input data. When the form data changes and you go to another tab it will ask you to save these changes before moving on. This will pause the tabs hide event until you either confirmed or declined to save the form. On cancel the event will be prevented and the widget will stay in the current tab:

triggerAsync $(el).triggerAsync(event, [success], [prevented])

Annotated source

jQuery.fn.triggerAsync triggers an event and calls a success handler when it has finished propagating through the DOM and no handler called event.preventDefault() or returned false. The prevented callback will be used otherwise:

$('panel').triggerAsync('show', function(){

default events eventname.default

Annotated source

jQuery.event.default adds default event handlers. A default event runs when all other event handlers have been triggered and none has called event.preventDefault() or returned false. Default events are prefixed with the default namespace. The following example adds a default toggle event:

$('#text').on('toggle.default', function(ev) {

$('#text').on('toggle', function(ev, animation) {
    if(animation) {

pause and resume event.pause() event.resume()

Annotated source

Pausing an event works similar to .stopImmediatePropagation() by calling event.pause(). Calling event.resume() will continue propagation. This is great when doing asynchronous processing in an event handler:

$('#todos').on('show', function(ev){

  $(this).load('todos.html', function(){

resize resize

Annotated source

jQuery.event.resize allows you to listen to resize events on arbitrary elements. Unlike other events that bubble from the target element to the document the resize event will propagate from the outside-in. This means that outside elements will always resize first. Trigger the resize event whenever the dimensions of an element change and inside elements should adjust as well.

The following example will always resize to it’s full parent width and height

$('#foo').on('resize', function() {
  var parent = $(this).parent();


The resize event makes creating application like layouts a lot easier. The following example creates a common layout with top, left, right and center elements within a container. Use the blue square to resize the outside container. The resize event will take care of adjusting the dimensions of the inside elements:

swipe swipeleft swiperight swipeup swipedown swipe

Annotated source

jQuery.event.swipe adds support for swipe motions providing the delegatable swipeleft, swiperight, swipedown, swipeup and swipe events:

  'swipe' : function(ev) {
  'swipeleft' : function(ev) {
    console.log('Swiping left');
  'swiperight' : function(ev) {
    console.log('Swiping right');
  'swipeup' : function(ev) {
    console.log('Swiping up');
  'swipedown' : function(ev) {
    console.log('Swiping down');

Set jQuery.event.swipe.delay to the maximum time the swipe motion is allowed to take (default is 500ms).

Swipe (using the mouse) in the green area in the following example to see the direction of the swipe:

Get Help

This site highlights the most important features of jQuery++. You can find the full API documentation on the DoneJS documentation page.

There are also several places you can go to ask questions or get help debugging problems.


Follow @jquerypp for updates, announcements and quick answers to your questions.


Visit the Forums for questions requiring more than 140 characters. DoneJS has a thriving community that’s always eager to help out.


The DoneJS IRC channel (#donejs on is an awesome place to hang out with fellow DoneJS users and get your questions answered quickly.

__Help Us Help You __

Help the community help you by using the jQuery++ jsFiddle template. Just fork it and include the URL when you are asking for help.

Get Help from Bitovi

Bitovi (developers of jQuery++) offers training and consulting for your team. They can also provide private one-on-one support staffed by their JavaScript/Ajax experts. Contact Bitovi if you’re interested.

Why jQuery++

Easy to use

jQuery++ does things the jQuery way, which makes it really easy to learn if you are already familiar with jQuery. Get functionality that was always tricky to implement from one coherent library:


You don’t have to use all of jQuery++. Just chose the plugins you want using the download builder, load them with StealJS or as AMD modules. Each plugin only includes the dependencies it actually needs, so your JavaScript application will stay as small as possible.

Delegatable events also make it easy to integrate with libraries like CanJS and Backbone. No custom APIs to take care of, just the jQuery way of handling events.


Some jQuery++ plugins can help to significantly speed up your applications. Use

  • compare to quickly compare element positions
  • destroyed to avoid memory leaks and keep your references up to date when elements get removed from the DOM


jQuery++ is developed by Bitovi. We’re active on the forums, but should the need arise, can also be hired for paid support, training, and development.

Developing jQuery++

To develop jQuery++, add features, etc, you first must install DoneJS. DoneJS is the parent project of jQuery++ and the 4.0 version of JavaSciptMVC. It has DocumentJS and Steal as submodules that are used to generate the documentation and build the jQuery++ downloads.


  1. Clone DoneJS with:

    git clone git://
  2. Install all submodules by running

    cd donejs
    git submodule update --init --recursive

    Depending on your version of git, you might need to cd into each submodule and run git checkout.

  3. Fork jquerypp on Github

  4. Add your own fork as a remote in the jquery submodule:

    cd jquery
    git checkout master
    git remote add fork [email protected]:<username>/jquerypp.git


After installing jQuery++ and DoneJS, you’ll find the jQuery++ files in the jquery folder. Within jquery, the plugins are located in the dom and event folders. The controller, model, class and view folder are currently kept for backwards compatibility with JavaScriptMVC 3.2/3.3 and shouldn’t be modified. For each plugin (for example jquery/dom/compare) you will find:

  • compare.html - A demo page
  • compare.js - The actual commented and uncompressed source code
  • - The overview page (used in the generated documentation)
  • compare_test.js - The plugin tests
  • qunit.html/funcunit.html - The unit and/or functional tests

To develop jQuery++:

  1. Edit the plugin’s file.
  2. Add tests to the plugin_test.js test file.
  3. Open the plugin test page qunit.html or funcunit.html and make sure everything passes
  4. Open the big test page in jquery/qunit.html and make sure all tests pass
  5. Commit your changes and push to your fork (git push fork <branch>)
  6. Submit a pull request!


To edit, installing jQuery++ and DoneJS is not necessary. Simply fork and edit the github pages’s page online. Don’t forget to submit a pull request.

To edit the documentation at

  1. install jQuery++ and DoneJS.
  2. Edit the markdown and js files in the jquery folder.
  3. In the donejs root folder generate the docs with:

    ./js site/scripts/doc.js

    View them at site/docs.html

  4. Submit a pull request.

Making a build

To make a jQuery++ build, run:

js jquery/build/make.js

It puts the downloads in jquery/dist. To build a specific version check out the git tag you want to build and run the above command.

List of heroes

The following lists everyone who’s contributed something to CanJS. If we’ve forgotten you, please add yourself.

First, thanks to everyone who’s contributed to JavaScriptMVC and jQueryMX, and the people at Bitovi. This page is for contributors after jQuery++’s launch:

callumacrae - Width property for jQuery.selection and documentation fixes. fabianonunes - Fixed several errors in the build process. jbrumwell - Added several useful features for drag/drop events and jeffrose - 1 iamnoah - 1

Change Log

1.0.1 (February 6th 2013)

1.0.0 (November 20th 2012)

1.0 Beta 2

1.0 Beta (June 1st 2012)

  • Released!