JavaScript for Ajax developers in .NET framework

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JavaScript for Ajax developers
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To retrieve information about the inheritance relationship between classes, you use the inheritsFrom method. This method is called on a child class and accepts the potential parent class as an argument. It returns true if the class passed as an argument is effectively the parent class. In the following code, the catIsAPet variable hold true because Cat inherits from Pet:
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var catIsAPet = Samples.Cat.inheritsFrom(Samples.Pet);
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When talking about client classes, we stated that the Microsoft Ajax Library stores information about the type name in constructors. If you want to know the name of a type as registered by the Microsoft Ajax Library, you can call the getName method and get back a string with the type name:
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var customTypeName = Samples.Pet.getName(); var booleanTypeName = Boolean.getName();
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The first statement calls getName on the Pet class defined in section 3.3.1. The variable customTypeName holds the string Samples.Pet. In the second statement, you can see that the method also works on JavaScript s built-in types, like Boolean. In this case, the variable booleanTypeName holds the string Boolean. To complete our discussion of reflection in JavaScript, let s combine some of the methods illustrated in the previous section to build a more complex example. In the next section, you ll build a class browser for displaying the classes and interfaces defined in the root namespaces of the Microsoft Ajax Library.
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Building a simple class browser
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In this section, you want to combine some of the reflection methods presented in the previous section to obtain a class browser for exploring classes and interfaces defined in the root namespaces of the Microsoft Ajax Library. Figure 3.6 shows the example running in Internet Explorer. The code in listing 3.15 creates a list with the namespaces defined in the library. When the user chooses one from the list, you use some of the reflection methods to display all the classes and interfaces defined in that namespace.
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Figure 3.6 The Simple Namespace Browser running in Internet Explorer
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Using type reflection
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Listing 3.15 Code for the namespace browser
<div> <span>Namespace:</span> <select id="ddNamespace"> <option>Select a namespace</option> <option>Sys</option> <option>Sys.Net</option> <option>Sys.UI</option> <option>Sys.Services</option> <option>Sys.Serialization</option> </select> <div id="info"></div> </div> <script type="text/javascript"> <!-function pageLoad(sender, e) { var ddl = $get("ddNamespace"); $addHandlers(ddl, {change:onNamespaceChange}, this); } function onNamespaceChange(evt) { var interfaces = []; var classes = []; var info = $get("info"); var ddl = evt.target; if(ddl.selectedIndex == 0) { info.innerHTML = ""; return; } var ns = eval(ddl.options[ddl.selectedIndex].text); for(var attr in ns) { var currMember = ns[attr]; if(typeof(currMember) == "function") { if(Type.isClass(currMember)) { Array.add(classes, currMember.getName()); } else if(Type.isInterface(currMember)) { Array.add(interfaces, currMember.getName()); } } } var sb = new Sys.StringBuilder();
Parse namespace
Look for class Look for interface
Client StringBuilder instance
JavaScript for Ajax developers
displayArray(interfaces, "Interfaces:", sb); displayArray(classes, "Classes:", sb); info.innerHTML = sb.toString(); } function displayArray(arr, title, sb) { sb.append("<b>"); sb.append(title); sb.append("</b><br />"); sb.append(arr.join("<br/>") + "<br/>"); } //--> </script>
Format content of arrays
The markup for the example defines a drop-down list with all the namespaces defined by the Microsoft Ajax Library. When a namespace is selected, the corresponding string is evaluated B to obtain a reference to the namespace. Then, you loop the selected namespace to search for classes and interfaces contained in it. To do this, you first check for functions (recall that classes and interfaces are simulated with functions by the Microsoft Ajax Library). You use the isClass and isInterface methods CD to determine whether you ve found a class or an interface and then add it to the corresponding array. Finally, you use a string builder instance E to format the elements of the arrays F and display the information about classes and interfaces in a label on screen. We discussed the Sys.StringBuilder class in chapter 2. With this example, our discussion of the object-oriented constructs provided by the Microsoft Ajax Library is complete. JavaScript developers will benefit from the enhanced type system, and .NET developers will have a chance to become more comfortable with the JavaScript language. In the following section, we ll introduce the event model provided by the Microsoft Ajax Library. With this model, you can expose and raise events in JavaScript objects.
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