Beginning Web Development, Silverlight, and ASP.NET AJAX

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274 CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE Finally, you need to wire up the event handlers for the buttons, allowing navigation through the images. It’s pretty straightforward—you simply increment or decrement the current picture ID and then call ShowPic with the new ID: function DoPrev() { currentPic--; ShowPic(currentPic); } function DoNext() { currentPic++; ShowPic(currentPic); } And that’s it. You now have an Ajax page with forward (and backward) caching of images. You can streamline this page if you like—when you think about it, Ajax isn’t necessary for the ShowPage call—you could simply construct an tag from the current pic, but it is good to understand the technique, as you will use it in more complex apps. You can see the application in action in Figures 11-8 and 11-9. The latter is the result of clicking the >> button shown in Figure 11-8. As you run the application, you’ll see how quickly the pictures update and render. Figure 11-8. Running the forward-caching Ajax application
CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE 275 Figure 11-9. Browsing to the next bicycle The entire code for the page is shown in Listing 11-4. Listing 11-4. Forward-Caching Client AJAX Picture Client var ajaxRequest var cachedAjaxRequest var currentPic = 100; var theURL; var theCachedURL; function initAJAX() { try { ajaxRequest = new XMLHttpRequest(); cachedAjaxRequest = new XMLHttpRequest(); } catch(error) { ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
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The EXPERT’s VOIce ® in .NET Beg
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Beginning Web Development, Silverli
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Contents About the Author . . . . .
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■CONTENTS ix ■CHAPTER 5 ASP.NET
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■CONTENTS xi ■CHAPTER 11 Ajax A
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■CONTENTS xiii ■CHAPTER 15 Enha
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About the Author ■LAURENCE MORONE
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Introduction This book is aimed at
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PART 1 Building Web Applications
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4 CHAPTER 1 ■ INTRODUCTION TO WEB
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10 CHAPTER 2 ■ BASICS OF WEB DEVE
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38 CHAPTER 3 ■ WEB FORMS WITH ASP
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CHAPTER 4 Data Binding with ASP.NET
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CHAPTER 4 ■ DATA BINDING WITH ASP
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106 CHAPTER 5 ■ ASP.NET WEB SERVI
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CHAPTER 6 Deploying Your Web Site I
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CHAPTER 6 ■ DEPLOYING YOUR WEB SI
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CHAPTER 7 .NET 3.0: Windows Communi
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CHAPTER 7 ■ .NET 3.0: WINDOWS COM
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CHAPTER 8 .NET 3.0: Windows Present
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CHAPTER 8 ■ .NET 3.0: WINDOWS PRE
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CHAPTER 9 .NET 3.0: Windows Workflo
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CHAPTER 9 ■ .NET 3.0: WINDOWS WOR
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332 CHAPTER 14 ■ JAVASCRIPT PROGR
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CHAPTER 15 Enhancing the Web Experi
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CHAPTER 15 ■ ENHANCING THE WEB EX
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376 CHAPTER 16 ■ PROGRAMMING SILV
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416 ■INDEX applications. See also
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418 ■INDEX copying web sites, 25
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420 ■INDEX ■H H path language c
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422 ■INDEX object orientation, 16
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424 ■INDEX Sequential Workflow Co
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426 ■INDEX ■V V path language c
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