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The Microsoft AJAX Library adds the ability to work with namespaces to JavaScript. A namespace is a way to encapsulate code into a library for easier classification and reference. It also helps manage name collisions, because two classes cannot have the same name in a single namespace. In addition, namespaces that you create and register with the library are then available in IntelliSense in Visual Studio, making development a little easier.
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ChAPTER 9
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Working with Client-Side Scripting, AJAX, and jQuery
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The library provides an important class called Type. The Type class represents a typing system for JavaScript. It is the key class that enables you to have namespaces, classes, enumerations, and things like that. The class sits inside the Global namespace. You use the registerNamespace method of the Type class to define a namespace. This is typically done at the top of your class file. You then use the namespace you define here throughout your class definition to add classes, enumerations, and so forth. The following line of code shows an example.
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Type.registerNamespace("Contoso.Utilities");
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In this example, the Contoso.Utilities namespace is being defined. Consider this a companywide utility namespace that might include helper classes for a development team.
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CLASSES (CONSTRUCTORS, FIELDS, PROPERTIES, AND METHODS)
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The Microsoft AJAX Library also allows you to define class definitions. The syntax for creating a class with the library is Namespace.ClassName. You assign the class name to a function that also serves as your constructor. This function can also take parameters. For example, suppose you want to add a class to the Contoso.Utilities namespace defined earlier. The requirements for this class are to provide validation features (on the client) related to the process of a user changing his or her password. You might name this class ChangePasswordValidator. The following code shows a definition of this class.
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//define class name (as function), create constructor, and // set class-level field values Contoso.Utilities.ChangePasswordValidator = function(requirePasswordsNotMatch, requireNumber) { Contoso.Utilities.ChangePasswordValidator.initializeBase(this); this.RequirePasswordsNotMatch = requirePasswordsNotMatch; this.RequireNumber = requireNumber; this._passwordRuleViolations = new Array(); }
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Notice that the class is set to a function. This function serves as the constructor for the class. When a developer uses the new keyword to create an instance of your class, he or she will be shown this constructor by IntelliSense and have to provide the two parameters defined by the function. These parameters are specific to the password scenario and facilitate how the password rules will process. The parameters are set to field-level items on the class inside the constructor. This is shown by the following call.
this.<FieldName> = <parameter>
The following is an example.
this.RequireNumber = requireNumber)
Also notice the call to initializeBase. This ensures that the base class from which your class derives gets its constructor called, too. You typically derive your classes from Sys.Component or one of its derivates. However, you do not have to. You derive from Sys.Component, Sys.UI.Behavior, or Sys.UI.Control if you intend to use the class as part of an AJAX control (more on this later).
Lesson 2: Creating Client Scripts with the Microsoft AJAX Library ChAPTER 9 487
After you define the class and its constructor, the next step is to define the fields, properties, methods, and other items that make up the actual class. You do so by defining a prototype for the class. You set the prototype definition to include fields, methods, and methods that act as properties. For example, to define a prototype for the ChangePasswordValidator class, you make a call to the JavaScript prototype property and set it equal to a class definition (enclosed in braces). To define fields for the class, you simply declare variables at the class level and set their data type. Fields are essentially name-value pairs in which the name is an element of the prototype (or class definition) and the value is set by the user of the class. The following code shows the start of a class definition that also defines two Boolean fields.
//define class contents (fields, properties, methods) Contoso.Utilities.ChangePasswordValidator.prototype = { //declare fields RequirePasswordsNotMatch: Boolean, RequireNumber: Boolean, ... }
The next step is to add properties to the class definition just started. By default, JavaScript does not really support properties. Instead, you can define methods that act as properties by declaring two functions. One function returns the value of an internal member and the other function receives a value to be assigned to this internal member. The convention for naming properties in the Microsoft AJAX Library is to use set_propertyName and get_propertyName for the setter and getter, respectively. The internal variables are defined with leading underscores (_), as in _privateMember. This indicates to the library that these items should remain private to the class (even if JavaScript does not actually support private fields). As an example, consider the class discussed earlier for a user who is changing his or her password. You might want to define write-only properties for the current password and the new password. You can do so by simply implementing a set_ function (and not a get_). This is shown in the following code example, along with a property to return all password violations that occur during validation.
//properties set_currentPassword: function(value) { this._currentPassword = value; }, set_changeToPassword: function(value) { this._changeToPassword = value; }, get_passwordRuleViolations: function() { return this._passwordRuleViolations; },
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