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To learn more about web resources, browse to the following URL: http:// support.microsoft.com/kb/910442/en-us.
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The first argument passed to the WebResource attribute is the name of the web resource. The second argument is the MIME type (the Internet Media Type) of the web resource. In the example, you register the TextChangedBehavior.js file as a JavaScript resource. The corresponding MIME type is text/javascript.
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Let s pass to the attributes that decorate the class. The TextChangedExtender class is decorated with the following attributes:
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[TargetControlType(typeof(Control))] [Designer(typeof(TextChangedDesigner))] [ClientScriptResource("TextChanged.TextChangedBehavior", "TextChanged.TextChangedBehavior.js")]
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The first attribute, TargetControlType, restricts the use of the extender to a particular type of web control. We introduced this attribute in chapter 9, when we discussed the base framework for creating extenders. Here, you want to extend ASP.NET TextBox controls. Therefore, you change the attribute as follows:
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[TargetControlType(typeof(TextBox))]
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Trying to extend a control other than a TextBox will result in an exception being raised by ASP.NET. The subsequent attributes have been all introduced by the Toolkit API. A quick look at table 10.2 reveals that the Designer attribute specifies the class you use to enhance the design-time experience of the TextChanged extender. In the example, this class is called TextChangedDesigner, and it s defined in the TextChangedDesigner.cs file generated by the Visual Studio template. The ClientScriptResource attribute specifies which script file is loaded in the page by the extender. The first argument passed to the attribute is the fully qualified name of the client component. This information is needed by the ExtenderControlBase class to build the script descriptor for the client component used by the extender. The second argument is the name of the web resource associated with the JavaScript file. This is the same string you passed to the WebResource attribute. Extender properties As you know from chapter 9, an extender usually exposes properties that let you configure the client component from the server side. These properties are mapped to the corresponding properties of the client component, as shown in table 10.3.
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Table 10.3 Mappings between the properties of the TextChangedExtender class and the TextChangedBehavior class Extender property
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Client property
timeout textChanged (event)
Timeout OnTextChanged
The Ajax Control Toolkit API
The first property, Timeout, lets you specify on the server side the value of the timeout property exposed by the client behavior. The second property, OnTextChanged, specifies a JavaScript function that handles the textChanged event. Listing 10.9 shows how these properties are declared in the TextChangedExtender class.
Listing 10.9 Complete code for the TextChangedExtender class
[Designer(typeof(TextChangedDesigner))] [ClientScriptResource("TextChanged.TextChangedBehavior", "TextChanged.TextChangedBehavior.js")] [TargetControlType(typeof(Control))] public class TextChangedExtender : ExtenderControlBase { [ExtenderControlProperty] [DefaultValue(500)] [ClientPropertyName("timeout")] [RequiredProperty] public int Timeout { get { return GetPropertyValue<int>("Timeout", 500); } set { SetPropertyValue<int>("Timeout", value); } } [ExtenderControlEvent(true)] [DefaultValue("")] [ClientPropertyName("textChanged")] public string OnTextChanged { get { return GetPropertyValue<string>("OnTextChanged", String.Empty); } set { SetPropertyValue<string>("OnTextChanged", value); } } }
The ExtenderControlProperty attribute tells the base class that the value of the decorated property maps to a corresponding client property. The exact name of the client property is specified in the ClientPropertyName attribute (note that you remove the get_ prefix from the name of the client getter). If you omit the ClientPropertyName attribute, the base class uses the name of the server property. The GetPropertyValue<> and SetPropertyValue<> methods are generic methods for automatically storing and retrieving the value of a property from the control s ViewState. The first argument passed is the name of the ViewState field in which the value is stored. The second argument is the value that is returned if the ViewState s field is set to null.
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At the moment, the GetPropertyValue<> and SetPropertyValue<> methods are available only in the ExtenderControlBase class.
The ExtenderControlEvent attribute tells the base class that you want to specify a handler for an event raised by the client component. The name of the client event is specified in the ClientPropertyName attribute. The name of the JavaScript function that handles the event is contained in the string returned by the property. Testing the TextChanged extender Once the TextChanged project is compiled, you can use the TextChangedExtender like any other extender. Usually, an @Register directive is added at the top of an ASP.NET page to specify the assembly and the namespace in which the extender is contained, like so:
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