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jQuery UI 1.7: The User Interface Library for jQuery
jQuery UI 1.7: The User Interface Library for jQuery

jQuery UI 1.7: The User Interface Library for jQuery: Build highly interactive web applications with ready-to-use widgets from the jQuery User Interface library

By jQuery Foundation , Dan Wellman
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Book Nov 2009 392 pages 1st Edition
$28.99 $19.99
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jQuery UI 1.7: The User Interface Library for jQuery

Chapter 1. Introducing jQuery UI

Welcome to jQuery UI 1.7: The User Interface Library for jQuery. This resource aims to take you from your first steps to an advanced usage of the JavaScript library of UI widgets and interaction helpers built on top of the hugely popular and easy-to-use jQuery.

jQuery UI extends the underlying jQuery library to provide a suite of rich and interactive widgets along with code-saving interaction helpers, built to enhance the user interfaces of your websites and web applications. It's the official UI library for jQuery and although it is not the only library built on top of jQuery, in my opinion it is without a doubt the best.

jQuery has quickly become one of the most popular JavaScript libraries in use today and jQuery UI will definitely become the extension library of choice, thanks to its ever-growing range of common UI widgets, high levels of configurability, and its exceptional ease of implementation.

jQuery UI runs on top of jQuery and hence the syntax used to initialize, configure, and manipulate the different components is in the same comfortable, easy-to-use style as jQuery. We automatically get all of the great jQuery functionality at our disposal as well. The library is also supported by a range of incredibly useful tools, such as the CSS framework that provides a range of helper CSS classes, and the excellent ThemeRoller application that allows us to visually create our own custom themes for the widgets.

Over the course of this book we'll look at each of the existing components that make up the library. We will also be looking at their configuration options and trying out their methods in order to fully understand how they work and what they are capable of. By the end of the book, you'll be an expert in its implementation.

We already have a basic working knowledge of the components when we add a new component because of the consistency in how we implement the different components that make up the library. Therefore, we only need to learn any widget-specific functionality.

This chapter will cover the following topics:

  • How to obtain a copy of the library

  • How to set up a development environment

  • The structure of the library

  • ThemeRoller

  • The format of the API

  • Browser support

  • How the library is licensed

Downloading the library

To obtain a copy of the library, we should visit the download builder at, which gives us a range of different options for building a download package that is tailored for our particular implementational requirements. The following screenshot shows the download builder:

We can either download the complete current release of the library, or a complete package of the legacy 1.6 version, or we can select the components that we want and download a custom package.


This book is specifically tailored towards version 1.7 of jQuery UI (at the time of writing the current stable release is 1.7.2) and is not compatible with legacy versions of the library. jQuery UI 1.7 requires jQuery 1.3.

The page is laid out in a really friendly and easy-to-use way. It lists all of the different components in their respective groupings (core, interaction helpers, and widgets) and allows us to choose from one of 25 different predesigned themes along with providing information about the package (including both its compressed and uncompressed size).

We'll look at the different files found within the library in just a moment, but for now we should download the complete library. It will contain everything we need, including the JavaScript and CSS files, as well as any images from the current theme that different components rely on. It even contains the latest version of jQuery itself, so we don't need to worry about downloading this separately.

For now, just use the Current (stable) link at the top of the page. This will give us the default theme that is called smoothness. We'll look at downloading and using other themes in the next chapter.


Hosted Files

In reality, we don't even need to download the library in order to implement it in a production web application. Both jQuery and jQuery UI are hosted on Google's content delivery network (CDN), so we can include <script> elements that link to these files instead of using local versions. Only the complete library (not individual components) is available, although there are a range of different releases.

On a live site that receives a lot of international traffic, using a CDN will help ensure that the library files are downloaded to a visitor's computer from a server that is geographically close to them. This helps in making the response quicker for them and saving our own bandwidth. This is not recommended for local development however.

Setting up a development environment

We'll need a location to unpack the jQuery UI library in order to easily access the different parts of it within our own files. We should first create a project folder, into which all of our example files, as well as all of the library and other associated resources can be saved.

Create a new directory on your C: drive, or in your home directory, and call it jqueryui. This will be the root folder of our project and will be the location where we store all of the example files from the code download.

To unpack the library, open it in a compression program, such as the open source 7zip, and choose the extract or unzip command. When prompted for a location to unpack the archive to, choose the jqueryui folder that we just created.

The code examples that we'll be looking at use other resources, mostly images, but occasionally some PHP files too. The accompanying code download available on Packt's website contains all of the images that we'll be using. You should download this now if you can, visit: You'll need to create a new folder within the jqueryui project folder and call it img, then unpack all of the subdirectories within the img folder in the archive to this new folder.

The code download also contains all the examples files as well as the library itself. It would be incredibly easy to unpack the entire code download to a local directory and run each of the examples as they are.

These files are provided in the hope that they will be used for reference purposes only! I'd urge you to follow the examples in the book on the fly, manually creating each file as it is shown instead of just referring to the files in the code download. The best way to learn code is to code.

This is all we need to do, no additional platforms or applications need to be installed and nothing needs to be configured or set up. As long as you have a browser and some kind of code or text editor then everything is in place to begin developing with the library.

The structure of the library

Let's take a moment to look at the structure of the unpacked library. This will give us a feel for its composition and structure. Open up the jqueryui folder where we unpacked the library. The contents of this folder should be as follows:

  • A css directory

  • A development-bundle directory

  • A js directory

  • An index file

The css folder is used to store the complete CSS framework that comes with the library. Within this folder will be a directory that has the name of the theme we chose when building the download package. Inside this is single file that contains all of the CSS, and a folder that holds all the images used by the theme. We can also store the CSS files we'll be creating in the css directory.

The js folder contains minified versions of jQuery and the complete jQuery UI library, with all components rolled into this one file. In a live project, it is the js and css folders that we'd want to drop into our site.

The index is an HTML file that gives a brief introduction to the library and displays all of the widgets along with some of the CSS classes. If this is the first time you've ever used the library, you can take a look to see some of the things that we'll be working with throughout the course of this book.

The development-bundle directory contains a series of resources to help us develop with the library and contains the following subdirectories:

  • A demos folder

  • A docs folder

  • An external folder

  • A themes folder

  • A ui folder

Also present in the directory are the license files, documents showing the version of the library and its main contributors. An uncompressed version of jQuery is also present.

The demos folder contains a series of basic examples showing all of the different components in action. The docs folder contains API documents for each of the different components.

The external folder contains a set of tools that may be of use to developers. They are as follows:

  • The bgiframe plugin

  • The cookie plugin

  • A JavaScript implementation of the diff algorithm jsDiff

  • The unit testing suite qunit

  • The simulate plugin

The bgiframe plugin is used to fix the issue in IE6 where <select> elements appear above other content, regardless of z-index. This plugin is due to be removed in release 1.8 of jQuery UI and replaced with the stackfix utility. The cookie plugin makes it easy to use browser cookies. jsDiff is the JavaScript implementation of an algorithm that can be used to compare two strings and show the differences between them.

qunit is jQuery's unit testing suite and can be used to run unit tests on widgets and plugins that we may create. For more information on QUnit visit: The simulate plugin simulates mouse and keyboard events and allows the functionality of widgets or plugins to be tested automatically.

Other than the cookie plugin (which we use in Chapter 12), we won't be using any of these tools in the examples we'll look at.

The themes folder contains two different themes—the first is the base theme that is a neutral, minimal theme of grey tones. The second is the smoothness theme, which we chose when building our download. It is very similar to the base theme.

The ui folder contains the individual, uncompressed source files of each of the different components of the library.


ThemeRoller is a custom tool written with jQuery and PHP. It allows us to visually produce our own custom jQuery UI theme and package it up in a convenient, downloadable archive, which we can drop into our project with no further coding (other than using the stylesheet in a HTML <link> element of course).

ThemeRoller was created by Filament Group, Inc. and makes use of a number of jQuery plugins released into the open source community. It can be found at

ThemeRoller is certainly the most comprehensive tool available for creating your own jQuery UI themes. We can very quickly and easily create an entire theme comprised of all of the styles needed for targeting elements, including the images we'll need.

If you looked at the index.html file a little earlier on then the ThemeRoller landing page will instantly be familiar as it shows all of the UI widgets on the page, skinned with the default smoothness theme.

The page features an interactive menu on the left that is used to work with the application. Each item within the menu expands to give you access to the available style settings for each part of the widget, such as the content and the clickable elements.

Here we can create our custom theme with ease and see the changes instantly as they are applied to the different visible parts of each widget on the page:

When you're not feeling particularly inspired while creating a theme, there is also a gallery of preconfigured themes that you can instantly use to generate a fully configured theme. Aside from this convenience, the best thing about these preselected themes is that when you select one, it is loaded into the left menu. Therefore, you can easily make little tweaks as required:

Without a doubt, this is the best way to create a visually appealing custom theme that matches the UI widgets to your existing site, and is the recommended method of creating custom skins.

Installing and using the new theme is as easy as selecting or creating it. The Download theme button in the above screenshot takes us back to the download builder, which has the CSS and images for the new theme integrated into the download package.

If it's just the new theme we want, we can deselect the actual components and just download the theme. Once downloaded the css folder within the downloaded archive will contain a folder that has the name of the theme. We can simply drag this folder into our own local css folder, and then link to the stylesheet from our own pages.

We won't be looking at this tool in much detail throughout the book. We'll be focusing instead on the style rules that we need to manually override in our own stylesheet to generate the desired look of the examples.

Component categories

There are two types of components found within the jQuery UI library—low-level interaction helpers that are designed to work primarily with mouse events, and there are the widgets that produce visible objects on the page, which are designed to perform a specific function.

The interaction helpers category includes the following components:

  • Draggable

  • Droppable

  • Resizable

  • Selectable

  • Sortable

The higher-level widgets included (at the time of writing) are as follows:

  • Accordion

  • Datepicker

  • Dialog

  • Progressbar

  • Slider

  • Tabs

The ui.core.js file that is required by all other library components, comes under neither category, but could nevertheless be seen as the core component of the library. This file sets up the construct that all widgets use to function and adds some core functionality which is shared by all of the library components. This file isn't designed to be used standalone, and exposes no functionality that can be used outside of another component.

Apart from these components, there is also a series of UI effects that produce different animations or transitions on targeted elements on the page. These are excellent for adding flair and style to our pages, in addition to the strong functionality of the components. We'll be looking at these effects in the final chapter of the book.

I'd like to add here that the jQuery UI library is currently undergoing a rapid period of expansion and development. It is also constantly growing and evolving with bug fixes and feature enhancements continually being added. It would be impossible to keep entirely up-to-date with this aggressive expansion and cover components that are literally about to be released.

The great thing about jQuery UI's simplified API is that once you have learned to use all of the existing components (as this book will show you), you'll be able to pick up any new components very quickly. As this book is being written, there are already a number of new components nearing release, with many more in the pipeline and all of these components will automatically be ThemeRoller-ready.

Browser support

Like jQuery itself, jQuery UI supports all of the major browsers in use today including the following:

  • IE6, IE7, and IE8

  • Firefox 2 and Firefox 3

  • Opera 9 and Opera 10

  • Safari 3 and Safari 4

  • Chrome 1, Chrome 2, and Chrome 3

This is by no means a comprehensive list, but I think that it includes the most common browsers currently in use, making jQuery UI very well supported.

The widgets are built from semantically correct HTML elements generated as needed by the components. Therefore, we won't see excessive or unnecessary elements being created or used.

Book examples

The library is as flexible as standard JavaScript, and by this I mean that there is often more than one way of doing the same thing, or achieving the same end. For example, the callback properties used in the configuration objects for different components, can usually take either references to functions or inline anonymous functions, and use them with equal ease and efficiency.

In practice, it is advisable to keep your code as minimal as possible (which jQuery really helps with anyway). But to make the examples more readable and understandable, we'll be separating as much of the code as possible into discrete modules. Therefore, callback functions and configuration objects will be defined separately from the code that calls or uses them.

To reduce the number of files that we have to create and work with, all of the JavaScript will go into the host HTML page on which it runs, as opposed to in separate files. Please keep in mind that this is not advisable for production websites. I'd also just like to make it clear that the main aim throughout the course of this book is to learn how to use the different components that make up jQuery UI. If an example seems a little convoluted, it may simply be that this is the easiest way to expose the functionality of a particular method or property, as opposed to a situation that we would find ourselves coding for in regular implementations.

Library licensing

Like jQuery, the jQuery UI library is dual licensed under the MIT and GPL open source licenses. These are both very unrestrictive licenses that allow the creators of the library to take credit for its production and retain intellectual rights over it, without preventing us as developers from using the library in any way that we like.

The MIT license explicitly states that users of the software (jQuery UI in this case) are free to use, copy, merge, modify, publish, distribute, sublicense, and sell. This lets us do pretty much whatever we want with the library.

The only requirement imposed by this license is that we must keep the original copyright and warranty statements intact.

This is an important point to make. You can take the library and do whatever you like with it. Build applications on top of the library and then sell those applications, or give them away for free. Put the library in embedded systems like cell phone OSs and sell those. But whatever you do, leave the original text file with John Resig's name in it present. You may also duplicate it word for word in the help files or documentation of your application.

The MIT license is very lenient, but because it is not copyrighted itself, we are free to change it. We could therefore demand that users of our software give attribution to us instead of the jQuery team, or pass off the code as our own.

The GPL license is copyrighted, and offers an additional layer of protection for the library's creators and the users of our software. jQuery is provided free and open source and the GPL license ensures that it will always remain free and open source, regardless of the environment it may end up in, and that the original creators of the library are given the credit they deserve. Again, the original GPL license file must be available within your application.

The licenses are not there to restrict us in any way and are not the same as the kind of license that comes with software you might install on your computer. In most cases, how the library is licensed will not be a consideration when using it.

API introduction

The version 1.5 release of jQuery UI was a milestone in the library's history. This was the release in which the API for each component was significantly simplified, making the library both easier to use and more powerful.

Once you've worked with one of the components from the library, you'll instantly feel at home when working with any of the other components since the methods of each component are called in exactly the same way.

The API for each component consists of a series of different methods. While these are all technically methods, it may be useful to categorize them based on their particular function.

The plugin method

This method is used to initialize the component and is simply the name of the component followed by parentheses. I will refer to this throughout the book as the plugin method or widget method.

Common methods

The destroy method can be used with any of the components to completely disable the widget being used and in most cases returns the underlying HTML to its original state. The option method is used by all components to get or set any configuration option after initialization. The enable and disable methods are used by most library components.

Specialized methods

Each component has one or more methods unique to that particular component that performs specialized functions.

Methods are consistently called throughout each of the different components by passing the method that we'd like to call as a simple string to the component's plugin method, with any arguments that the method accepts passed as strings after the method name.

For example, to call the destroy method of the accordion component, we would simply do as follows:


See how easy that was? Every single method exposed by all of the different components is called in this same simple way.

Some methods, like standard JavaScript functions, accept arguments that trigger different behavior in the component. If we wanted to call the disable method on a tab in the tabs widget for example, we would do the following:

$("#someElement").tabs("disable", 1);

The disable method, when used in conjunction with the tabs widget, accepts an integer which refers to the index of the individual tab within the widget.

Similarly, to enable the tab again we would use the enable method:

$("#someElement").tabs("enable", 1);

Again we supply an argument to modify how the method is used. Sometimes the arguments that are passed to the method vary between components. The accordion widget for example does not enable or disable individual accordion panels, only the whole widget, so no additional arguments following the method name are required.

The option method is slightly more complex than the other common methods, but it's also more powerful and is just as easy to use. The method is used to either get or set any configurable option after the component has been initialized.

To use the option method in getter mode to retrieve the current value of an option, we could use the following code:

$("#someElement").accordion("option", "navigation");

This code would return the current value of the navigation option of the accordion widget. So to trigger getter mode we just supply the option name that we'd like to retrieve.

In order to use the option method in setter mode instead, we can supply the option name and the new value as arguments:

$("#someElement").accordion("option", "navigation", "true");

This code would set the value of the navigation option to true. As you can see, although the option method gives us the power to both get and set configuration options, it still retains the same easy to use format of the other methods.

Using jQuery UI feels just like using jQuery and having built up confidence coding with jQuery, moving on to jQuery UI is the next logical step to take.

Events and callbacks

The API for each component also contains a rich event model that allows us to easily react to different interactions. Each component exposes its own set of unique custom events, yet the way in which these events are used is the same, regardless of which event is used.

We have two ways of working with events in jQuery UI. Each component allows us to add callback functions that are executed when the specified event is fired, as values for configuration options. For example, to use the select event of the tabs widget that is fired any time a tab is selected, we could use the following code:

var config = {
  select: function() {

The name of the event is used as the option name and an anonymous function is used as the option value. We'll look at all of the individual events that are used with each component in later chapters.

The other way of working with events is to use jQuery's bind() method. To use events in this way, we simply specify the name of the component followed by the name of the event.

$("#someElement").bind("tabsselect", function() {

Usually, but not always, callback functions used with the bind() method are executed after the event has been fired, while callbacks specified using configuration options are executed directly before the event is fired.

The callback functions are called in the context of the DOMElement that triggers the event. For example, in a tabs widget with several tabs, the select event will be fired from the actual tab that is clicked, not the tabs widget as a whole. This is extremely useful to us as developers, because it allows us to associate the event with a particular tab.

Some of the custom events fired by jQuery UI components are cancellable and if stopped can be used to prevent certain actions taking place. The best example of this (which we'll look at later in the book) is preventing a dialog widget from closing by returning false in the callback function of the beforeclose event.

beforeclose: function() {
  if (readyToClose === false) {
    return false

If the arbitrary condition in this example was not met, false would be returned by the callback function and the dialog would remain open. This is an excellent and powerful feature that can give us fine-grained control over the widget's behavior.

Callback arguments

Any anonymous functions that we supply as callback functions to the different events are automatically passed two objects, the original event object, and an object containing useful information about the widget. The information contained with the second object varies between components, we'll look at this in greater detail in later chapters.

To use these two objects we just specify them as arguments to the function.

var config = {
  select: function(e, ui) {


Every single component will automatically supply these objects to any callback functions we define.


jQuery UI removes the difficulty of building engaging and effective user interfaces. It provides a range of components that can quickly and easily be used out of the box with little configuration. They each expose a comprehensive set of properties and methods for integration with your pages or applications if a more complex configuration is required.

Each component is designed to be efficient, lightweight, and semantically correct along with making use of the latest object-oriented features of JavaScript. When combined with jQuery, it provides an awesome addition to any web developer's toolkit.

So far, we've seen how the library can be obtained, how your system can be set up to utilize it, and how the library is structured. We've also looked at how the different widgets can be themed or customized, how the API simply and consistently exposes the library's functionality, and the different categories of component.

We've covered some important topics during the course of this chapter, but now, thankfully, we can get on with using the components of jQuery UI and get down to some proper coding!

Left arrow icon Right arrow icon

Key benefits

  • Organize your interfaces with reusable widgets: accordions, date pickers, dialogs, sliders, tabs, and more
  • Enhance the interactivity of your pages by making elements drag-and-droppable, sortable, selectable, and resizable
  • Packed with examples and clear explanations of how to easily design elegant and powerful front-end interfaces for your web applications
  • Revised and targeted at jQuery UI 1.7


Modern web application user interface design requires rapid development and proven results. jQuery UI, a trusted suite of official plug-ins for the jQuery JavaScript library, gives you a solid platform on which to build rich and engaging interfaces with maximum compatibility and stability, and minimum time and effort. jQuery UI has a series of ready-made, great-looking user interface widgets and a comprehensive set of core interaction helpers designed to be implemented in a consistent and developer-friendly way. With all this, the amount of code that you need to write personally to take a project from conception to completion is drastically reduced. Specially revised for version 1.7 of jQuery UI, this book has been written to maximize your experience with the library by breaking down each component and walking you through examples that progressively build upon your knowledge, taking you from beginner to advanced usage in a series of easy-to-follow steps. In this book, you'll learn how each component can be initialized in a basic default implementation and then see how easy it is to customize its appearance and configure its behavior to tailor it to the requirements of your application. You'll look at the configuration options and the methods exposed by each component's API to see how these can be used to bring out the best of the library. Events play a key role in any modern web application if it is to meet the expected minimum requirements of interactivity and responsiveness, and each chapter will show you the custom events fired by the component covered and how these events can be intercepted and acted upon.

What you will learn

How the brand-new CSS framework styles each of the library components Organizing different sections of related content as tabs and accordions to save space on your page while maximizing its content Displaying messages, images, and interactive content like forms using the dialog widget Using sliders for volume and color control of your applications by dynamically scrolling left and right, displaying different ranges Allowing your site visitors to select dates from the calendar using the date picker widget Adding an attractive and effective deterministic progress bar to give visitors essential feedback on how much longer a process has left to complete Providing a drag-and-drop mechanism to let users directly rearrange elements around the page Making a range of elements of a group selectable and taking collective actions on them Creating a page with content boxes that can be sorted into various positions to suit the visitor s personal preference Adding flair to your actions with animation effects

Product Details

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Publication date : Nov 9, 2009
Length 392 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781847199720
Category :
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What do you get with eBook?

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Product feature icon Download this book in EPUB and PDF formats
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Product Details

Publication date : Nov 9, 2009
Length 392 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781847199720
Category :
Concepts :

Table of Contents

19 Chapters
jQuery UI 1.7 Chevron down icon Chevron up icon
Credits Chevron down icon Chevron up icon
About the Author Chevron down icon Chevron up icon
About the Reviewers Chevron down icon Chevron up icon
Preface Chevron down icon Chevron up icon
1. Introducing jQuery UI Chevron down icon Chevron up icon
2. The CSS Framework Chevron down icon Chevron up icon
3. Tabs Chevron down icon Chevron up icon
4. The Accordion Widget Chevron down icon Chevron up icon
5. The Dialog Chevron down icon Chevron up icon
6. Slider Chevron down icon Chevron up icon
7. Datepicker Chevron down icon Chevron up icon
8. Progressbar Chevron down icon Chevron up icon
9. Drag and Drop Chevron down icon Chevron up icon
10. Resizing Chevron down icon Chevron up icon
11. Selecting Chevron down icon Chevron up icon
12. Sorting Chevron down icon Chevron up icon
13. UI Effects Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

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