Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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354 x CHAPTER 10 ASP.NET AJAX added by clicking the button are not a part of the HTML source because they have been added dynamically by the ASP.NET AJAX Framework to the browser’s internal HTML. How It Works By wrapping the content in an UpdatePanel you define a region in your page that you want to refresh without affecting the entire page. In the example, the Button control inside the UpdatePanel caused a postback and thus a refresh of just the region in which the control is defined. Rather than replacing the entire page, only the part of the page that is wrapped in the UpdatePanel is refreshed, causing a flickerfree reload of the page. If you analyze the data that gets sent from the server to the browser (using a network analysis tool like Fiddler, which you can download from www.fiddler2.com/fiddler2/), you would see that only a limited amount of data gets sent to the client. Rather than the full page (weighing around 12KB), only the following data is sent: 1|#||4|232|updatePanel|cpMainContent_ctl00| 4/9/2012 11:56:09 AM |0|hiddenField|__EVENTTARGET||0|hiddenField|__EVENTARGUMENT||0|hiddenField|__ LASTFOCUS||1624|hiddenField|__VIEWSTATE|1Atsytn51usXShfT92FZnRfhkyw76l6TfovQaG ... Demo|184|scriptBlock|ScriptPath|/ScriptResource.axd?d=zvkqIRNUspAvS1yKeFhMb_LRgBPQ LrZDpLmd71civkClsZ5csFf1SkTk1NurvxrEjhFFVa7dJqUQpcX9l3wMJNiJeY5DJdOF5sqxTU0JGDbsEuI_njxenny6ggiBtc 4vOKR16h2V2npds3RA8dURw2&t=57d51992| Note that I cut out a big piece of content including much of the View State of the page from the middle (represented by the three dots) to save some space in this book. If you look at this response, you’ll recognize the HTML for the updated Label and the Button; the two controls that have been defined within the of the UpdatePanel control. The remaining text is used by the ASP .NET AJAX Framework to maintain page state (using the __VIEWSTATE field) and to understand where to place the response in the page. Even though a lot of data still gets sent down the wire, it’s far less than the original full page of around 12KB. This results in a faster response and a better user experience. When you looked at the source of the page in the browser in step 10 you may have noticed that the page still contained the original source, not the updated source modified by the ASP.NET AJAX Framework. This sometimes makes it difficult to build, test, and debug Ajax applications because you cannot really see what data gets sent to the browser. Fortunately, many tools are available that help with this. Besides the aforementioned Fiddler tool, you’re advised to take a look at the Microsoft Internet Explorer Developer Toolbar. It ships with Internet Explorer 8 and later and is accessible through the Tools Í Developer Tools menu option. Another great tool for debugging is Firebug, which integrates nicely with the Firefox browser. You can get the tool at http://getfirebug.com. Google’s Chrome has a similar tool that you can open by clicking the Wrench icon and then choosing Tools Í Developer tools.
Using ASP.NET AJAX in Your Projects x 355 In this exercise, you used two important AJAX Extensions controls. The ScriptManager—that you placed in UpdatePanel.aspx directly in this exercise—is a requirement for most Ajax functionality in an ASPX page to operate correctly. It serves as the bridge between the client page and the Microsoft ASP.NET AJAX Framework and takes care of things like registering the correct JavaScript files that are used in the browser. The UpdatePanel is then used to define regions you want to update without reloading the entire page. You see both controls in more detail in the following sections. A Closer Look at the UpdatePanel The UpdatePanel and its content is the only part of the page that is updated when you click a button (as discussed in the previous exercise). This is the default behavior of an UpdatePanel, where only its inner contents are refreshed by other server controls defined within the element. However, the UpdatePanel can do more than this, as you see in the next section. Common UpdatePanel Properties The following table lists some of the important properties of the UpdatePanel that enable you to influence its behavior. PROPERTY ChildrenAsTriggers Triggers RenderMode UpdateMode ContentTemplate DESCRIPTION This property determines whether controls located within the UpdatePanel can cause a refresh of the UpdatePanel. The default value is True, as you saw in the previous exercise. When you set this value to False, you have to set the UpdateMode to Conditional. Note that controls defined within the UpdatePanel still cause a postback to the server with this property set to False; they just don’t update the panel automatically anymore. The Triggers collection contains PostBackTrigger and AsyncPostBackTrigger elements. The first is useful if you want to force a complete page refresh, whereas the latter is useful if you want to update an UpdatePanel with a control that is defined outside the panel. You can set this property to Block (the default) or Inline to indicate whether the UpdatePanel renders itself as a or element. This property determines whether the control is always refreshed (the UpdateMode is set to Always) or only under certain conditions, for example, when one of the controls defined in the element is causing a postback (the UpdateMode is set to Conditional). The default for this setting is Always. Although not visible in the Properties Grid for the UpdatePanel, the is an important property of the UpdatePanel. It’s the container in which you place controls as children of the UpdatePanel. If you forget this required ContentTemplate, VS gives you a warning.
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BEGINNING ASP.NET 4.5 FOREWORD . .
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BEGINNING ASP.NET 4.5 IN C# AND VB
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—To Niek
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CREDITS Acquisitions Editor Mary Ja
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CONTENTS FOREWORD INTRODUCTION xxxi
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CONTENTS Working with Files in Your
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CONTENTS Not All Controls Rely on V
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CONTENTS Skins 245 Creating a Skin
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CONTENTS Providing Feedback to User
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CONTENTS Authentication: How Can Yo
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CONTENTS Introducing Bundling and M
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INTRODUCTION TO BUILD EFFECTIVE AND
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INTRODUCTION ‰ Chapter 4, “Work
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INTRODUCTION HOW THIS BOOK IS STRUC
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INTRODUCTION ‰ Code shown for the
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INTRODUCTION FIGURE I-2 The Site fo
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BEGINNING ASP.NET 4.5
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4Working with ASP.NET Server Contro
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A Closer Look at ASP.NET Server Con
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A Closer Look at ASP.NET Server Con
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Types of Controls x 117 FIGURE 4-4
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Types of Controls x 119 The Smart T
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Types of Controls x 121 } DropDownL
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Types of Controls x 123 Container C
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Types of Controls x 133 Validation
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The ASP.NET State Engine x 135 serv
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Practical Tips on Working with Cont
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Themes x 229 With this exported tem
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Themes x 231 Replace Theme with Sty
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Themes x 233 type="text/css" rel=
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Themes x 235 ASP.NET themes are not
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Themes x 237 FIGURE 6-19 How It Wor
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Themes x 239 VB.NET Dim myCookie As
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Themes x 241 FIGURE 6-21 Within the
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Themes x 243 C# preferredTheme.Valu
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Skins x 245 a cookie called Preferr
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Skins x 247 3. In the Extension box
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Formatting Your Controls Using Styl
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Handling Events x 563 background-im
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Caching x 593 Programmatic Caching
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The Role Manager x 631 FIGURE 16-19
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17 Personalizing Websites WHAT YOU
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Understanding Profile x 645 In the
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BConfiguring SQL Server 2012 So far
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allowAnonymous attribute - ASP.NET
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text strings - types validation con
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