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Dynamic interfaces in Web Parts
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ASP.NET developers to enhance their web applications with dynamic interfaces. They use the same techniques and methods that they use in Visual Studio. To use the extensions in a website, you must install the client and server framework and configure web.config accordingly. In previous versions of SharePoint this process had to be done manually or by using SharePoint Features that modified the web.config file and installed the components on all servers. SharePoint 2010 is based on ASP.NET 3.5, which includes the server and client ASP.NET AJAX framework. The web.config configuration elements are created by default, which makes it easier for you to use the Microsoft ASP.NET AJAX Extensions in any Web Part solution. The most popular ASP.NET AJAX control is UpdatePanel. This control is similar to the standard Panel control but can be updated asynchronously. The UpdatePanel control has a set of asynchronous triggers that make the update panel reload. To illustrate, let s continue to enhance the RSS Web Part that you ve been building in the last few chapters. Add the button shown in figure 10.1. You ll use the button to refresh the RSS feed without reloading the entire page.
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Although I could show you how to do this in a Visual Web Part and use a declarative approach, I recommend using the programmatic approach. Even though you aren t using a Visual Web Part, this code won t work as a sandboxed Web Part. The UpdatePanel object requires the ScriptManager, which isn t accessible from the sandboxed worker process.
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The first thing that you need to do is declare an UpdatePanel object and a Button in your Web Part class:
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protected UpdatePanel updatePanel; protected Button refreshButton;
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These controls are declared in the class as protected so that they can be used in new Web Parts inheriting from this Web Part. The CreateChildControls method is implemented in listing 10.1; the method creates the update panel and the button. The feed isn t retrieved by this method (as in previous implementations of the RSS Web Part), but instead the feed retrieval is moved to the OnPreRender method.
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Figure 10.1 The RSS Web Part has a button that makes a partial update of the page, refreshing only the contents of the specific Web Part.
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Using Ajax and JavaScript in Web Parts Listing 10.1 Adding an UpdatePanel to the RSS Web Part
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protected override void CreateChildControls() { if (string.IsNullOrEmpty(this.RssFeedUrl)) { HyperLink hl = new HyperLink { NavigateUrl = string.Format( "javascript:ShowToolPane2Wrapper('Edit','129','{0}');" , this.ID), ID = string.Format("MsoFrameworkToolpartDefmsg_{0}", this.ID), Text = "Click here to configure the Web Part..." }; this.Controls.Add(hl); return; } Creates
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updatePanel = new UpdatePanel(); updatePanel.ID = "updatePanel"; refreshButton = new Button() { Text = "Refresh", ID = "refreshButton", CssClass = "ms-NarrowButtonHeightWidth" }; this.Controls.Add(refreshButton);
UpdatePanel
updatePanel.Triggers.Add(new AsyncPostBackTrigger() { ControlID = refreshButton.ID } ); this.Controls.Add(updatePanel); this.ChildControlsCreated = true; }
Adds trigger to UpdatePanel
Connects button to trigger
The CreateChildControls method makes the standard check to see if the RssFeedUrl property has a value. If it does, CreateChildControls creates an UpdatePanel object B. The button is then added to the control tree. It has no click event defined because you don t need to execute any specific code if it s clicked; you just need it to trigger an update. So you connect the button to the update panel using a trigger on the update panel. An AsyncPostBackTrigger C is created that takes the control ID D of the button as an argument. When the user clicks the button, this trigger will fire and a partial postback will occur. Finally, the UpdatePanel object is added to the control tree. This partial postback will only update the UpdatePanel in the user interface. To retrieve the feed and also add information about when the feed last was retrieved, you add logic to the OnPreRender method. The implementation, in listing 10.2, looks quite similar to what you just did to render the RSS Web Part with a few differences.
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