Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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358 x CHAPTER 10 ASP.NET AJAX Providing Feedback to Users Despite the visual problems that postbacks usually cause, they have one big advantage: the user can see something is happening. The UpdatePanel makes this a little more difficult. Users have no visual cue that something is happening until it has happened. To tell your users to hold on for a few seconds while their request is being processed, you can use the UpdateProgress control. The UpdateProgress Control You connect the UpdateProgress control to an UpdatePanel using the AssociatedUpdatePanelID property. Its contents, defined in the element, are then displayed whenever the associated UpdatePanel is busy refreshing. You usually put text such as “Please wait” or an animated image in this template to let the user know something is happening, although any other markup is acceptable as well. In addition to the AssociatedUpdatePanelID and properties, the UpdateProgress control features the following properties you typically use. PROPERTY DisplayAfter DynamicLayout DESCRIPTION Determines the time in milliseconds that the control waits before it displays its contents. This is useful when the refresh period is so short that a notification message would be overkill. The default is 500 milliseconds, which is half a second. Determines whether the control takes up screen real estate when hidden. This maps directly to the CSS display: none; (when this setting is True/true) or visibility: hidden; (when it’s False/false). In the following exercise, you see how to combine the UpdatePanel, the ScriptManager, and the UpdateProgress controls to make the contact form user control flicker-free. TRY IT OUT Flicker-free Pages—Putting It All Together In this exercise, you modify the user control ContactForm.ascx that you created earlier, wrapping the entire control in an UpdatePanel so the page doesn’t perform a full postback when you enter a message and click the Send button. To help users understand that the page is busy when the message is being sent, you add an UpdateProgress panel to the control. Inside this control you place an animated GIF image that is available in the code download for this book. Alternatively, you can go to www.ajaxload. info and create your own animated image. 1. Open the ContactForm.ascx user control from the Controls folder in Markup View and wrap the entire element and the Label at the bottom of the control in an UpdatePanel with a . You can do this by typing the code directly in Markup View, by using a code snippet, or by dragging the control from the Toolbox. Make sure the ID of the UpdatePanel is set to UpdatePanel1. You should end up with the following code:
Using ASP.NET AJAX in Your Projects x 359 .... 2. Save the changes to the control and then open the Frontend.master file from the MasterPages folder. Between the opening tag and the for the PageWrapper, add a ScriptManager control by dragging it from the Toolbox into the source of the page. You should end up with this code: 3. Save the changes to the master page and close it. 4. Open the UpdatePanel.aspx page you created in an earlier Try It Out and remove the ScriptManager control. Because this control is now declared in the master page, you can no longer redefine it in pages that are based on that master. Save and close the page. 5. Open the Contact.aspx page from the About folder in your browser and then fill in the contact form. Note that as soon as you click the Send button, the form disappears and is replaced with the label stating that the message is sent. Just as with the earlier UpdatePanel example, you’ll notice no page flicker when the page reloads and displays the text Message Sent. 6. To keep the user updated on the progress while the message is delivered to the mail server, you should add an UpdateProgress control to the page. Inside this control, you add an animated image and some text informing the user the message is being sent. To add the image, locate the folder where you extracted the files that come with this book (at C:\BegASPNET\Resources) with File Explorer (Windows Explorer on Windows 7). Open the Chapter 10 folder and then the Monochrome folder. Drag the PleaseWait.gif file from File Explorer into the Images folder of the Monochrome theme under App_Themes. Repeat this process, but now drag PleaseWait.gif from the DarkGrey folder into its respective theme’s Images folder. Figure 10-3 shows how both images should end up. 7. Open the Monochrome.css file, scroll all the way down to the end, and add the following rule: .PleaseWait { height: 32px; width: 500px; background-image: url(Images/PleaseWait.gif); background-repeat: no-repeat; padding-left: 40px; line-height: 32px; } FIGURE 10-3
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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 Single Item Controls 455 P
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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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2 x CHAPTER 1 GETTING STARTED WITH
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34 x CHAPTER 2 BUILDING AN ASP.NET
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66 x CHAPTER 3 DESIGNING YOUR WEB P
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100 x CHAPTER 3 DESIGNING YOUR WEB
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4Working with ASP.NET Server Contro
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Introduction to Server Controls x 1
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Introduction to Server Controls x 1
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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 125 Note that t
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Types of Controls x 127 FIGURE 4-12
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Types of Controls x 129 FinishButto
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Types of Controls x 131 FileUpload
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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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The ASP.NET State Engine x 137 FIGU
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The ASP.NET State Engine x 139 4. A
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Practical Tips on Working with Cont
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Summary x 143 ⊲ WHAT YOU LEARNED
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146 x CHAPTER 5 PROGRAMMING YOUR AS
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6Creating Consistent Looking Websit
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Consistent Page Layout with Master
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Using a Centralized Base Page x 219
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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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Practical Tips on Creating Consiste
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Summary x 251 The imaginary CSS cla
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7Navigation WHAT YOU WILL LEARN IN
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Different Ways to Move Around Your
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Using the Navigation Controls x 257
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Programmatic Redirection x 277 Redi
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Programmatic Redirection x 279 How
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Practical Tips on Navigation x 281
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286 x CHAPTER 8 USER CONTROLS advan
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294 x CHAPTER 8 USER CONTROLS Note:
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296 x CHAPTER 8 USER CONTROLS ASP.N
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298 x CHAPTER 8 USER CONTROLS The c
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416 x CHAPTER 11 JQUERY 7. Save you
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418 x CHAPTER 11 JQUERY look at jQu
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420 x CHAPTER 11 JQUERY ⊲ WHAT YO
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454 x CHAPTER 13 DISPLAYING AND UPD
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14 LINQ and the ADO.NET Entity Fram
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Introducing LINQ x 499 surprise tha
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Mapping Your Data Model to an Objec
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Introducing Query Syntax x 507 and
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Introducing Query Syntax x 509 Wher
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Introducing Query Syntax x 511 Firs
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Introducing Query Syntax x 513 diff
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Using Server Controls with LINQ Que
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Summary x 551 model. Combined with
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15 Working with Data — Advanced T
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Formatting Your Controls Using Styl
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Handling Events x 563 background-im
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Handling Events x 565 4. Make sure
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Handling Events x 567 The PreRender
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Handling Events x 569 Button1_Click
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Handling Events x 571 Select Case e
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Handling Events x 573 The RowDataBo
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Handling Events x 575 These classes
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Handling Events x 577 8. Save all y
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Hand-Coding Data Access Code x 579
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Caching x 589 In all the database e
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Caching x 591 Output Caching With o
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Caching x 593 Programmatic Caching
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Caching x 595 ‰ SummaryLabel ‰
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Caching x 597 } font-style: italic;
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Caching x 599 expiration date, whic
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Summary x 601 EXERCISES 1. Imagine
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16 Security in Your ASP.NET 4.5 Web
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Introducing the Login Controls x 60
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The Role Manager x 627 such as the
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The Role Manager x 629 1 . From wit
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The Role Manager x 631 FIGURE 16-19
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The Role Manager x 633 2. Save and
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The Role Manager x 635 Management s
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The Role Manager x 637 Alternativel
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The Role Manager x 639 } } case Lis
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Summary x 641 SUMMARY You can imple
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17 Personalizing Websites WHAT YOU
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Understanding Profile x 645 In the
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Understanding Profile x 647 You can
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Understanding Profile x 649 5. To t
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Understanding Profile x 651 To defi
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Understanding Profile x 653 press t
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Understanding Profile x 655 10. Dou
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Understanding Profile x 657 1. In M
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Understanding Profile x 659 e As Ev
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Understanding Profile x 661 That’
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Understanding Profile x 663 By clic
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Understanding Profile x 665 sent to
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Understanding Profile x 667 5. From
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Understanding Profile x 669 10. Ent
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Other Ways of Dealing with Profile
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Summary x 675 How It Works Much of
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680 x CHAPTER 18 EXCEPTION HANDLING
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730 x CHAPTER 19 DEPLOYING YOUR WEB
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BConfiguring SQL Server 2012 So far
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Configuring SQL Server 2012 x 795 C
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allowAnonymous attribute - ASP.NET
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decimal data type - DynamicEnableDe
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input controls - handling input co
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Microsoft Developer Network - New S
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Profile.GetProfile - ReadAllText me
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SQL statement - styling installing,
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text strings - types validation con
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validation controls- ViewState coll
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web services - Where clause flow of
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