Beginning Web Development, Silverlight, and ASP.NET AJAX

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276 CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE } cachedAjaxRequest = new ActiveXObject("Microsoft.XMLHTTP"); } ShowPic(currentPic); function GetPic(thisPic) { } theCachedURL = "GetPicture.aspxpicid=" + thisPic; cachedAjaxRequest.open("GET", theCachedURL); cachedAjaxRequest.send(); function ShowPic(thisPic) { theURL = "GetPicture.aspxpicid=" + thisPic; ajaxRequest.open("GET", theURL); ajaxRequest.onreadystatechange=DisplayPic; ajaxRequest.send(); } function DisplayPic() { var divPic = document.getElementById("pic"); if(ajaxRequest.readyState == 4) { divPic.innerHTML = ""; } GetPic(currentPic+1); GetPic(currentPic+2); GetPic(currentPic-1); GetPic(currentPic-2); } function DoPrev() {
CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE 277 } currentPic--; ShowPic(currentPic); function DoNext() { currentPic++; ShowPic(currentPic); } This technique and methodology will prove very useful when you’re building your applications. It also introduces a whole new way of thinking about the user experience. Forward caching changes the way in which many applications (e.g., maps) can be presented to the user. If you are building an application that could make the most of this, it’s well worth thinking it through and building it into your site. Summary In this chapter, you took a look at Ajax, seeing some examples of applications where Ajax greatly improves the overall user experience, such as MSN MoneyCentral and Google Maps. You looked at the history of dynamic, partial page refresh technologies, leading up to the XMLHttpRequest object, for which the technique of Ajax was coined. You looked into the architecture of Ajax and how you can use the XMLHttpRequest object in code, before delving into a couple of examples. The first example, though very simple, demonstrated straightaway that the instant-feedback nature of Ajax (as opposed to the traditional delayed-via-postback feedback of a web application) can improve your end users’ experience. You then looked into another major technique used by Ajax programmers: forward caching. This technique is used by applications such as mapping applications to allow users to get what seems to be instant access to data. Applications using this technique are smart enough to download and cache data that would likely be requested next. When
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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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CHAPTER 13 ■ AJAX SCRIPTS AND SER
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CHAPTER 13 ■ AJAX SCRIPTS AND SER
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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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Beginning Web Development, Silverlight, and ASP.NET AJAX

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