jquery Cookbook jquery Community Experts O'REILLY8 Tokyo Taipei Sebastopol Beijing Cambridge Farnham Koln

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1 jquery Cookbook jquery Community Experts O'REILLY8 Beijing Cambridge Farnham Koln Sebastopol Taipei Tokyo

2 Foreword xi Contributors xiii Preface xvii 1. jquery Basics Including the jquery Library Code in an HTML Page Executing jquery/javascript Coded After the DOM Has Loaded but Before Complete Page Load Selecting DOM Elements Using Selectors and the jquery Function Selecting DOM Elements Within a Specified Context 15 Set of DOM Elements Filtering a Wrapper 1.6 Finding Descendant Elements Within the Currently Selected Wrapper Set Returning to the Prior Selection Before a Destructive Change Including the Previous Selection with the Current Selection Traversing the DOM Based on Your Current Context to Acquire a New Set of DOM Elements Creating, Operating on, and Inserting DOM Elements Removing DOM Elements Replacing DOM Elements Cloning DOM Elements Getting, Setting, and Removing DOM Element Attributes Getting and Setting HTML Content Getting and Setting Text Content Using the $ Alias Without Creating Global Conflicts Selecting Elements with jquery Selecting Child Elements Only Selecting Specific Siblings 37 v

3 2.3 Selecting Elements by Index Order Selecting Elements That Are Currently Animating Selecting Elements Based on What They Contain Selecting Elements by What They Don't Match Selecting Elements Based on Their Visibility Selecting Elements Based on Attributes Selecting Form Elements by Type Selecting an Element with Specific Characteristics 47 the Context Parameter Using 2.12 Creating a Custom Filter Selector Beyond the Basics Looping Through a Set of Selected Results Reducing the Selection Set to a Specified Item Convert a Selected jquery Object into a Raw DOM Object Getting the Index of an Item in a Selection Making a Unique Array of Values from an Existing Array Performing an Action on a Subset of the Selected Set Configuring jquery Not to Conflict with Other Libraries Adding Functionality with Plugins Determining the Exact Query That Was Used jquery Utilities Detecting Features with jquery.support Iterating Over Arrays and Objects with jquery.each Filtering Arrays with jquery.grep Iterating and Modifying Array Entries with jquery.map Combining Two Arrays with jquery.merge Filtering Out Duplicate Array Entries with jquery.unique Testing Callback Functions with jquery.isfunction Removing Whitespace from or Strings Form Values with jquery. trim Attaching Objects and Data to DOM with jquery.data Extending Objects with jquery.extend Faster, Simpler, More Fun That's Not jquery, It's JavaScript! What's Wrong with $ (this)? Removing Redundant Repetition Formatting Your jquery Chains Borrowing Code from Other Libraries Writing a Custom Iterator Toggling an Attribute 99 vi

4 5.8 Finding the Bottlenecks Caching Your jquery Objects Writing Faster Selectors Loading Tables Faster Coding Bare-Metal Loops Reducing Name Lookups Updating the DOM Faster with.innerhtml Debugging? Break Those Chains Is It a jquery Bug? Tracing into jquery Making Fewer Server Requests Writing Unobtrusive JavaScript Using jquery for Progressive Enhancement Making Your Pages Accessible Dimensions Finding the Dimensions of the Window and Document Finding the Dimensions of an Element Finding the Offset of an Element Scrolling an Element into View Determining Whether an Element Is Within the Viewport Centering an Element Within the Viewport Absolutely Positioning an Element at Its Current Position Positioning an Element Relative to Another Element Switching Stylesheets Based on Browser Width Effects Sliding and Fading Elements in and out of View Making Elements Visible by Sliding Them Up Creating a Horizontal Accordion Simultaneously Sliding and Fading Elements Applying Sequential Effects Determining Whether Elements Are Currently Being Animated Stopping and Resetting Animations Using Custom Easing Methods for Effects Disabling All Effects Using jquery UI for Advanced Effects Events Attaching Handler a to Many Events Reusing a Handler Function with Different Data Removing a Whole Set of Event Handlers Triggering Specific Event Handlers 176 vii

5 8.5 Passing Dynamic Data to Event Handlers Accessing an Element ASAP (Before document.ready) Stopping the Handler Execution Loop Getting the Correct Element When Using event.target Avoid Multiple hover() Animations in Parallel Making Event Handlers Work for Newly Added Elements Advanced Events Getting jquery to Work When Loaded Dynamically Speeding Up Global Event Triggering Creating Your Own Events Letting Event Handlers Provide Needed Data Creating Event-Driven Plugins Getting Notified When jquery Methods Are Called Using Objects' Methods as Event Listeners HTML Form Enhancements from Scratch Focusing a Text Input on Page Load Disabling and Enabling Form Elements Selecting Radio Buttons Automatically (De)selecting All Checkboxes Using Dedicated Links (De)selecting All Checkboxes Using a Single Toggle Adding and Removing Select Options Autotabbing Based on Character Count Displaying Remaining Character Count Constraining Text Input to Specific Characters Submitting a Form Using Ajax Validating Forms HTML Form Enhancements with Plugins Validating Forms Creating Masked Input Fields Autocompleting Text Fields Selecting a Range of Values Entering a Range-Constrained Value Uploading Files in the Background Limiting the Length of Text Inputs Displaying Labels Above Input Fields Growing an Input with Its Content Choosing a Date jquery Plugins Where Do You Find jquery Plugins? 263 viii

6 12.2 When Should You Write a jquery Plugin? Writing Your First j Query Plugin Passing Options into Your Plugin Using the $ Shortcut in Your Plugin Including Private Functions in Your Plugin Supporting the Metadata Plugin Adding a Static Function to Your Plugin Unit Testing Your Plugin with QUnit Interface Components from Scratch Creating Custom Tool Tips Navigating with a File-Tree Expander Expanding an Accordion Tabbing Through a Document Displaying a Simple Modal Window Building Drop-Down Menus Cross-Fading Rotating Images Sliding Panels User Interfaces with jqueryui Including the Entire jquery Ul Suite Including an Individual jquery UI Plugin or Two Initializing a jquery UI Plugin with Default Options Initializing a jquery UI Plugin with Custom Options Creating Your Very Own jquery UI Plugin Defaults Getting and Setting jquery UI Plugin Options Calling jquery UI Plugin Methods Handling jquery UI Plugin Events Destroying a jquery UI Plugin Creating a jquery UI Music Player jqueryuitheming Styling jquery UI Widgets with ThemeRoller Overriding jquery Ul Layout and Theme Styles Applying a Theme to Non-jQuery UI Components Referencing Multiple Themes on a Single Page Appendix: Additional CSS Resources jquery, Ajax, Data Formats: HTML, XML, JS0N, JS0NP jquery and Ajax Using Ajax on Your Whole Site Using Simple Ajax with User Feedback Using Ajax Shortcuts and Data Types 400 ix

7 16.5 Using HTML Fragments and jquery Converting XML to DOM Creating JSON Parsing JSON Using jquery and JSONP Using jquery in Large Projects Using Client-Side Storage Saving Application State for a Single Session Saving Application State Between Sessions Using a JavaScript Template Engine Queuing Ajax Requests Dealing with Ajax and the Back Button Putting JavaScript at the End of a Page Unit Testing Automating Unit Testing Asserting Results Testing Synchronous Callbacks Testing Asynchronous Callbacks Testing User Actions Keeping Tests Atomic Grouping Tests Selecting Tests to Run 434 Index 437 x

jquery in Action Second Edition !II BEAR BIBEAULT YEHUDA KATZ MANNING Greenwich (74 0 w. lang.)

jquery in Action Second Edition BEAR BIBEAULT YEHUDA KATZ!II MANNING Greenwich (74 0 w. lang.) '. "'~""l" brief contents 1 _ IntroducingjQuery 3 2 _ Selecting the elements upon which to act 18 3 _ Bringing