c# thoughtworks qrcode Lesson 1: Creating AJAX-Enabled Web Forms in Visual C#

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Lesson 1: Creating AJAX-Enabled Web Forms
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ChAPTER 9
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</asp:GridView> <asp:SqlDataSource ID="SqlDataSourceNwd" runat="server" ConnectionString="<%$ ConnectionStrings:NwdConnectionString %>" SelectCommand="SELECT [SupplierID], [CompanyName], [City], [Phone], [ContactName] FROM [Suppliers]"> </asp:SqlDataSource> </ContentTemplate> </asp:UpdatePanel>
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CONTROLLING PARTIAL-PAGE UPDATES
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You can combine multiple UpdatePanel controls on the same page. Each can update portions of the page independently or in a coordinated fashion. You might also have controls that cause standard postbacks on the same page as those that cause asynchronous postbacks. In each of these cases, you need to be able to control how and when the page elements update. The UpdatePanel exposes the UpdateMode and ChildrenAsTriggers properties for controlling when a postback should occur to trigger an update of content contained in an UpdatePanel. The first property, UpdateMode, has two possible settings: Always and Conditional. The Always value is used to indicate that the content of an UpdatePanel should be updated on every postback that originates from the page. This includes other asynchronous updates that are the result of another UpdatePanel on the page as well as those that are simply standard postbacks on the page. The Conditional value of the UpdatePanel.UpdateMode property is more complex. It indicates that an update to the UpdatePanel is conditional on something else on the page. For example, consider the case of nested UpdatePanels. If you set the nested UpdatePanel control s UpdateMode property to Conditional, it will only be updated when the parent UpdatePanel causes a postback. Another way to trigger an update to an UpdatePanel with an UpdateMode set to Conditional is to explicitly call its Update method from server-side code. This might be done as the result of another asynchronous update on the page. If you set the UpdateMode to the Conditional value, by default nested UpdatePanel controls will not cause an update to their parent. You can change this behavior by setting the outer UpdatePanel control s ChildrenAsTriggers property to true. When you do so, any updates triggered by the nested UpdatePanel will also trigger an update to the parent UpdatePanel. You can also explicitly define the controls that you want to use to trigger an update to an UpdatePanel. These controls can be inside or outside the UpdatePanel, and the update will be triggered for both Conditional mode and Always mode. When you add a trigger to an UpdatePanel, when a user triggers a postback from the trigger control, the UpdatePanel content will also post back and be refreshed. As an example, consider the GridView control discussed previously. This control is inside an UpdatePanel, as shown in Figure 9-2. It updates itself when a user pages through the data. Now, notice that the page also supports a search function. The search is triggered by a button named ButtonSearch (also displayed in Figure 9-2).
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Working with Client-Side Scripting, AJAX, and jQuery
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FigURE 9-2 An ASPX page with a search button and a GridView control.
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You might want the search to also result in a partial-page update to GridView. To make this happen, you can add a trigger to the UpdatePanel that contains the GridView control. A trigger can be defined directly in markup (or through the Property window in Design view or in your code). The following markup shows an example.
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<asp:UpdatePanel ID="UpdatePanel1" runat="server"> <Triggers> <asp:AsyncPostBackTrigger ControlID="ButtonSearch" EventName="Click" /> </Triggers> <ContentTemplate> ... Grid View markup ... </ContentTemplate> </asp:UpdatePanel>
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Notice that the trigger is of type AsyncPostBackTrigger. It contains both the ID of the control that causes the postback and the name of the trigger control s event that causes the postback. You can add more than one trigger to the UpdatePanel as well. In this example, clicking the search button will update the GridView as a partial-page update.
Lesson 1: Creating AJAX-Enabled Web Forms
ChAPTER 9
PARTIAL-PAGE UPDATES AND ERROR HANDLING
You can handle errors that occur during a partial-page update by writing a handler for the AsyncPostBackError event of the ScriptManager control. This event is raised on the server when an asynchronous postback throws an error. You can also set the AsyncPostBackErrrorMessage of the ScriptManager control to an error message to be displayed to the user when a partial-page update error occurs.
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