UNDERSTANDING WEB PART INTERNALS in VS .NET

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UNDERSTANDING WEB PART INTERNALS
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The use of client-side event code can help to create applications that are more dynamic and interactive, because the user is not left waiting for his operations to run while the browser performs a postback to the web server. Performing a server postback requires the entire payload of the page to be round-tripped each time that server communication is required. Ajax, which stands for Asynchronous JavaScript and XML, is a technique that is being used increasingly by developers to create sites that are highly interactive. By using Ajax, a developer is able to send smaller packets of data through to XML web services without requiring a complete page postbox. The response from these web service calls is then processed in the browser by using client-side JavaScript. The result is twofold; first, only the part of a page that needs to be refreshed is communicated between the server and the user s browser; and second, the web pages appear more responsive because the user is not stalled while waiting for a full page refresh to occur. I ll defer a fuller discussion about Ajax and web parts until chapter 10, when we explore ways to take advantage of this technique with the portal framework. 2.4.3 IWebEditable The last of the three interfaces that are implemented by all web parts is IWebEditable. This interface allows developers to associate custom editing controls with their web parts. We ll look at this interface in detail in chapter 5 and again, in even greater detail in chapter 8. For now we ll just look at an example to show why you would need to use this interface. Remember from chapter 1 that we created the simple portal example and that we added an AppearanceEditorPart to an EditorZone to allow some of the properties of the web part to be edited by users at runtime. Figure 2.10 shows us the editor zone with the AppearanceEditorPart displayed. At runtime, users of our portal can access this AppearanceEditorPart to directly manipulate the appearance of web parts on the page. Creating custom EditorParts As you can see, the appearance editor provides us with user interface elements for managing the appearance of the web part such as its Title, its Height, and Width. But what if you need special controls to manage a property of your web part An example might be if we wanted to provide users of our weather web part with a map that allowed them to select their weather region visually. This is the kind of scenario that the IWebEditable
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Figure 2.10 The AppearanceEditorPart provides user interface elements that allow users to manage the appearance of web parts at runtime.
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WEB PARTS: THE BUILDING BLOCKS OF PORTALS
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interface is designed to manage, as it provides us with a way of assigning custom editor controls with our web part. To implement the IWebEditable interface, two members must be implemented: The CreateEditorParts method which allows you to return a collection of all custom editor parts that you want to associate with your control The WebBrowsableObject property which provides a way to return a reference to the underlying control that you wish to expose to your custom editor part. To associate a custom map editor part with our weather web part, we start by adding code to the CreateEditorParts method which returns the custom editor control that we need to manage our zip code property. The following code shows what is required to return a custom editor part named ZipCodeSelector from the CreateEditorParts method:
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public override EditorPartCollection CreateEditorParts() { EditorPartCollection editorParts = base.CreateEditorParts(); editorParts.Add(new ZipCodeSelector()); return editorParts; }
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In the ZipCodeSelector editor part, we would include the rendering logic that we want to display when the part is displayed in the editor zone. As with all server controls, this is accomplished by writing some custom code in the Render method. In this case we ll add some code to display an icon and a link that the user can click to launch a larger map selection dialog. How do you do that Figure 2.11 shows how the editor part would display in the browser when the Figure 2.11 The completed editor part is displayed in the editor zone code in listing 2.11 is executed. Figure 2.11 shows a custom editor whenever the associated web part is edited. section appearing in the EditorZone. The custom editor section has a title of Untitled and contains an icon a picture of the globe and a link that allows users to launch a completely custom dialog for selecting zip codes. The custom dialog that is launched could display an interactive map that allowed users to select postcodes in a more visual manner than the standard textbox control normally offered for entering postcodes.
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