Touchscreen Device Events

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Университет имени Сулеймана Демиреля

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[НЕСОРТИРОВАННОЕ]

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143023864X_HT5.pdf

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 Foreword...............................................................................................................	xv
 About the Authors................................................................................................	xvi
 About the Technical Reviewer ............................................................................	xvii
 Acknowledgments .............................................................................................	xviii
 Introduction .........................................................................................................	xix
 Chapter 1: Overview of HTML5................................................................................	1
The Story So Far—The History of HTML5..........................................................................	1
The Myth of 2022 and Why It Doesn’t Matter ....................................................................	2
Who Is Developing HTML5? ...............................................................................................	3
A New Vision......................................................................................................................	3
Compatibility and Paving the Cow Paths ..................................................................................................	3
Utility and the Priority of Constituencies ..................................................................................................	3
Interoperability Simplification ..................................................................................................................	4
Universal Access ......................................................................................................................................	5
A Plugin–Free Paradigm ....................................................................................................	5
What’s In and What’s Out? .......................................................................................................................	6
What’s New in HTML5?......................................................................................................	8
New DOCTYPE and Character Set.............................................................................................................	8
New and Deprecated Elements ................................................................................................................	9
Semantic Markup ...................................................................................................................................	10
Simplifying Selection Using the Selectors API........................................................................................	17
JavaScript Logging and Debugging........................................................................................................	19

 CONTENTS

window.JSON .........................................................................................................................................	20
DOM Level 3 ...........................................................................................................................................	21
Monkeys, Squirrelfish, and Other Speedy Oddities ................................................................................	21
Summary .........................................................................................................................	22
 Chapter 2: Using the Canvas API ..........................................................................	23
Overview of HTML5 Canvas .............................................................................................	23
History ....................................................................................................................................................	23
What Is a Canvas? ..................................................................................................................................	24
Canvas Coordinates................................................................................................................................	24
When Not to Use Canvas ........................................................................................................................	25
Fallback Content.....................................................................................................................................	25
CSS and Canvas......................................................................................................................................	26
Browser Support for HTML5 Canvas.......................................................................................................	26
Using the HTML5 Canvas APIs .........................................................................................	26
Checking for Browser Support ...............................................................................................................	27
Adding a Canvas to a Page .....................................................................................................................	27
Applying Transformations to Drawings ..................................................................................................	30
Working with Paths ................................................................................................................................	32
Working with Stroke Styles ....................................................................................................................	34
Working with Fill Styles ..........................................................................................................................	35
Filling Rectangular Content ....................................................................................................................	36
Drawing Curves ......................................................................................................................................	37
Inserting Images into a Canvas ..............................................................................................................	39
Using Gradients ......................................................................................................................................	41
Using Background Patterns ....................................................................................................................	43
Scaling Canvas Objects ..........................................................................................................................	44
Using Canvas Transforms.......................................................................................................................	46
Using Canvas Text ..................................................................................................................................	48

 CONTENTS

Applying Shadows . ................................................................................................................................	50
Working with Pixel Data . .......................................................................................................................	52
Implementing Canvas Security. .............................................................................................................	54
Building an Application with HTML5 Canvas ...................................................................	55
Practical Extra: Full Page Glass Pane . ...................................................................................................	58
Practical Extra: Timing Your Canvas Animation. ....................................................................................	58
Summary .........................................................................................................................	61
 Chapter 3: Working with Scalable Vector Graphics..............................................	63
Overview of SVG ..............................................................................................................	63
History . ..................................................................................................................................................	63
Understanding SVG. ...............................................................................................................................	64
Scalable Graphics. .................................................................................................................................	66
Creating 2D Graphics with SVG . ............................................................................................................	66
Adding SVG to a Page . ...........................................................................................................................	67
Simple Shapes. ......................................................................................................................................	67
Transforming SVG Elements . .................................................................................................................	68
Reusing Content . ...................................................................................................................................	69
Patterns and Gradients . .........................................................................................................................	70
SVG Paths . .............................................................................................................................................	71
Using SVG Text . .....................................................................................................................................	72
Putting the Scene Together . ..................................................................................................................	73
Building an Interactive Application with SVG...................................................................	74
Adding Trees. .........................................................................................................................................	75
Adding the updateTrees Function. .........................................................................................................	75
Adding the removeTree Function . .........................................................................................................	76
Adding the CSS Styles . ..........................................................................................................................	76
The Final Code. ......................................................................................................................................	77
Summary .........................................................................................................................	81

vii

 CONTENTS

 Chapter 4: Working with Audio and Video	............................................................83
Overview of Audio and Video ...........................................................................................	83
Video Containers.....................................................................................................................................	83
Audio and Video Codecs .........................................................................................................................	84
Audio and Video Restrictions..................................................................................................................	85
Browser Support for Audio and Video ....................................................................................................	86
Using the Audio and Video API.........................................................................................	86
Checking for Browser Support ...............................................................................................................	87
Accessibility............................................................................................................................................	88
Understanding Media Elements..............................................................................................................	89
Working with Audio ................................................................................................................................	94
Working with Video.................................................................................................................................	95
Practical Extras.....................................................................................................................................	103
Summary .......................................................................................................................	106
 Chapter 5: Using the Geolocation API .................................................................	107
About Location Information ...........................................................................................	107
Latitude and Longitude Coordinates.....................................................................................................	107
Where Does Location Information Come From? ...................................................................................	108
IP Address Geolocation Data ................................................................................................................	109
GPS Geolocation Data ...........................................................................................................................	109
Wi-Fi Geolocation Data .........................................................................................................................	110
Cell Phone Geolocation Data.................................................................................................................	110
User–Defined Geolocation Data............................................................................................................	111
Browser Support for Geolocation...................................................................................	111
Privacy ...........................................................................................................................	112
Triggering the Privacy Protection Mechanism......................................................................................	113
Dealing with Location Information........................................................................................................	114

viii

 CONTENTS

Using the Geolocation API..............................................................................................	114
Checking for Browser Support .............................................................................................................	114
Position Requests .................................................................................................................................	115
Building an Application with Geolocation ......................................................................	120
Writing the HTML Display .....................................................................................................................	122
Processing the Geolocation Data..........................................................................................................	123
The Final Code......................................................................................................................................	126
Practical Extras..............................................................................................................	129
What’s My Status?................................................................................................................................	130
Show Me on a Google Map...................................................................................................................	131
Summary .......................................................................................................................	133
 Chapter 6: Using the Communication APIs .........................................................	135
Cross Document Messaging ..........................................................................................	135
Understanding Origin Security..............................................................................................................	138
Browser Support for Cross Document Messaging................................................................................	139
Using the postMessage API ..................................................................................................................	139
Building an Application Using the postMessage API ............................................................................	140
XMLHttpRequest Level 2................................................................................................	146
Cross-Origin XMLHttpRequest ..............................................................................................................	147
Progress Events....................................................................................................................................	149
Browser Support for HTML5 XMLHttpRequest Level 2 .........................................................................	150
Using the XMLHttpRequest API.............................................................................................................	150
Building an Application Using XMLHttpRequest ...................................................................................	152
Practical Extras..............................................................................................................	156
Structured Data ....................................................................................................................................	156
Framebusting .......................................................................................................................................	157
Summary .......................................................................................................................	157

 CONTENTS

 Chapter 7: Using the WebSocket API ..................................................................	159
Overview of WebSocket.................................................................................................	159
Real-Time and HTTP .............................................................................................................................	159
Understanding WebSocket ...................................................................................................................	161
Writing a Simple Echo WebSocket Server .....................................................................	167
Using the WebSocket API ..............................................................................................	176
Checking for Browser Support .............................................................................................................	176
Basic API Usage....................................................................................................................................	177
Building a WebSocket Application.................................................................................	182
Coding the HTML File............................................................................................................................	183
Adding the WebSocket Code ................................................................................................................	185
Adding the Geolocation Code................................................................................................................	185
Putting It All Together...........................................................................................................................	186
The Final Code......................................................................................................................................	188
Summary .......................................................................................................................	191
 Chapter 8: Using the Forms API..........................................................................	193
Overview of HTML5 Forms.............................................................................................	193
HTML Forms Versus XForms ................................................................................................................	194
Functional Forms..................................................................................................................................	194
Browser Support for HTML5 Forms ......................................................................................................	194
An Input Catalog ...................................................................................................................................	195
Using the HTML5 Forms APIs.........................................................................................	200
New Form Attributes and Functions .....................................................................................................	200
Checking Forms with Validation ...........................................................................................................	204
Validation Feedback .............................................................................................................................	207
Building an Application with HTML5 Forms...................................................................	209
Practical Extras.....................................................................................................................................	213

 CONTENTS

Summary .......................................................................................................................	215
 Chapter 9: Working with Drag-and-Drop ............................................................	217
Web Drag-and-Drop: The Story So Far ..........................................................................	217
Overview of HTML5 Drag-and-Drop...............................................................................	218
The Big Picture .....................................................................................................................................	218
Events to Remember ............................................................................................................................	221
Drag Participation.................................................................................................................................	224
Transfer and Control.............................................................................................................................	224
Building an Application with Drag-and-Drop .................................................................	225
Getting Into the dropzone .....................................................................................................................	234
Handling Drag-and-Drop for Files..................................................................................	235
Practical Extras..............................................................................................................	239
Customizing the Drag Display...............................................................................................................	239
Summary .......................................................................................................................	240
 Chapter 10: Using the Web Workers API.............................................................	241
Browser Support for Web Workers ................................................................................	242
Using the Web Workers API ...........................................................................................	242
Checking for Browser Support .............................................................................................................	242
Creating Web Workers..........................................................................................................................	243
Loading and Executing Additional JavaScript ......................................................................................	244
Communicating with Web Workers ......................................................................................................	244
Coding the Main Page....................................................................................................	245
Handling Errors.....................................................................................................................................	246
Stopping Web Workers .........................................................................................................................	247
Using Web Workers within Web Workers .............................................................................................	247
Using Timers.........................................................................................................................................	248
Example Code.......................................................................................................................................	248

 CONTENTS

Building an Application with Web Workers....................................................................	250
Coding the blur.js Helper Script............................................................................................................	252
Coding the blur.html Application Page .................................................................................................	253
Coding the blurWorker.js Web Worker Script .......................................................................................	254
Communicating with the Web Workers ................................................................................................	254
The Application in Action......................................................................................................................	256
Example Code.......................................................................................................................................	257
Summary .......................................................................................................................	261
 Chapter 11: Using the Storage APIs....................................................................	263
Overview of Web Storage ..............................................................................................	263
Browser Support for Web Storage.................................................................................	264
Using the Web Storage API ............................................................................................	264
Checking for Browser Support .............................................................................................................	264
Setting and Retrieving Values ..............................................................................................................	266
Plugging Data Leaks.............................................................................................................................	267
Local Versus Session Storage ..............................................................................................................	269
Other Web Storage API Attributes and Functions .................................................................................	269
Communicating Web Storage Updates .................................................................................................	272
Exploring Web Storage .........................................................................................................................	273
Building an Application with Web Storage.....................................................................	275
The Future of Browser Database Storage......................................................................	286
The Web SQL Database ........................................................................................................................	286
The Indexed Database API ....................................................................................................................	289
Practical Extras..............................................................................................................	291
JSON Object Storage ............................................................................................................................	291
A Window into Sharing .........................................................................................................................	292
Summary .......................................................................................................................	293

xii

 CONTENTS

 Chapter 12: Creating Offline Web Applications..................................................	295
Overview of HTML5 Offline Web Applications................................................................	295
Browser Support for HTML5 Offline Web Applications .........................................................................	297
Using the HTML5 Application Cache API........................................................................	297
Checking for Browser Support .............................................................................................................	297
Creating a Simple Offline Application...................................................................................................	298
Going Offline .........................................................................................................................................	298
Manifest Files .......................................................................................................................................	299
The ApplicationCache API.....................................................................................................................	300
Application Cache in Action..................................................................................................................	301
Building an Application with HTML5 Offline Web Applications......................................	303
Creating a Manifest File for the Application Resources........................................................................	306
Creating the HTML Structure and CSS for the UI ..................................................................................	306
Creating the Offline JavaScript.............................................................................................................	307
Check for ApplicationCache Support ....................................................................................................	309
Adding the Update Button Handler .......................................................................................................	309
Add Geolocation Tracking Code............................................................................................................	310
Adding Storage Code ............................................................................................................................	310
Adding Offline Event Handling ..............................................................................................................	311
Summary .......................................................................................................................	311
 Chapter 13: The Future of HTML5 .......................................................................	313
Browser Support for HTML5 ..........................................................................................	313
HTML Evolves ................................................................................................................	313
WebGL ..................................................................................................................................................	314
Devices .................................................................................................................................................	316
Audio Data API ......................................................................................................................................	316
Touchscreen Device Events..................................................................................................................	317
Peer-to-Peer Networking......................................................................................................................	320

xiii

 CONTENTS

Ultimate Direction	................................................................................................................................. 320
Summary .......................................................................................................................	320
 Index ...................................................................................................................	323

xiv

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