Beginning Web Development, Silverlight, and ASP.NET AJAX

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258 CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE Figure 11-2. Creating an ASP.NET number multiplier The associated markup for this page is shown in Listing 11-2. Listing 11-2. Markup for ASP.NET Multiplier Untitled Page 0 0
CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE 259 Text="Answer" Width="201px"> Finally, add a click event handler to the button, and add this code to it: } protected void btnMult_Click(object sender, EventArgs e) { int nX = Convert.ToInt16(TextBox1.Text); int nY = Convert.ToInt16(TextBox2.Text); int nAns = nX * nY; lblAnswer.Text = nAns.ToString(); The ideal user experience for a program like this would be a dynamic one, whereby when you type the numbers, the answer displays while you are typing. For example, if the second field has 5 in it and you type 4 in the first, the answer would immediately show 20. If you then type a 0 in the first field so that it displays 40, the answer should update to 200. The problem with this approach is that TextChanged events on ASP.NET controls do not fire until a postback, so this isn’t possible in a web application. Of course, for a simple calculation like multiplication, you could always use JavaScript to do it on the client side—but consider a more complex mathematical scenario, such as calculating a moving average or Bollinger band on a time series of data for a stock, and you’ll see that this rapidly becomes infeasible. So, for a server-side calculation, you have to perform a postback, and then you cannot do it on the changed text, so the desired user experience hits a technical constraint. In this case, you add the button and get it to trigger the postback, and you can then perform the calculation on the button’s click event. Now when you run the application, you can type numbers in the two text boxes and click the button. You’ll get a page refresh, and then you’ll see the answer to your calculation. Improving the UI Using Ajax Now consider the same scenario using Ajax. Thanks to the asynchronous updates that don’t use a postback, you can give more dynamic feedback to your users—as they type numbers in the text boxes, they’ll get immediate feedback of the results of the calculation.
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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 13 Ajax Scripts and Service
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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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Beginning Web Development, Silverlight, and ASP.NET AJAX

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