Working with Client-Side Scripting, AJAX, and jQuery in C#

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ChAPTER 9
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Working with Client-Side Scripting, AJAX, and jQuery
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You add methods to a class prototype in much the same way that you add a function. The following code shows two example functions. The first, CheckPasswordStrength, takes a string and returns an enumeration value, Contoso.Utilities.PasswordStrength (more on this in a moment). The second function definition, AllowPasswordChange, can be called to determine whether a user s changed password meets the criteria for a change. If not, rules are added to an Array, and the false value is returned by the function. These rules (or password error conditions) can then be accessed through the property defined previously.
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//methods CheckPasswordStrength: function(password) { var strPass = new String(password.toString()); if (strPass.length < 4) { return Contoso.Utilities.PasswordStrength.Weak; } else if (strPass.Length < 7) { return Contoso.Utilities.PasswordStrength.Medium; } else { return Contoso.Utilities.PasswordStrength.Strong; } }, AllowPasswordChange: function() { var pass1 = new String(this._currentPassword); var pass2 = new String(this._changeToPassword); //use new, extended Array type var ruleViolations = new Array(); //min length rule if (pass2.length < 5) { Array.add(ruleViolations, 'Password too short.'); } //check if passwords match if (this.RequirePasswordsNotMatch) { if (pass1 == pass2) { Array.add(ruleViolations, 'Passwords cannot match.'); } }
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Lesson 2: Creating Client Scripts with the Microsoft AJAX Library
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ChAPTER 9
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//contains numbers if (this.RequireNumber) { if (pass2.match(/\d+/) == null) { Array.add(ruleViolations, 'Password must include a number.'); } } //reset rule violations property this._passwordRuleViolations = ruleViolations; //determine if change allowed if (ruleViolations.length > 0) { return false; } else { return true; } }
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As with a namespace, you must also register a class with the Microsoft AJAX Library for it to be available with the ScriptManager at run time and through IntelliSense at design time. You register a class by calling the registerClass extension method of your object. This method has three parameters: typeName, baseType, and interfaceTypes. TypeName is the full name of the class you intend to register. BaseType is the class on which the new class builds. This is how inheritance is supported by the library. If your class should stand alone, you can pass null into this parameter. If your class is meant to be an AJAX control or a behavior, you pass in Sys.UI.Control or Sys.UI.Behavior, respectively. Finally, the interfaceTypes parameter indicates the interfaces that the class must implement. You can define your own interfaces with the library. You can also implement one or more framework interfaces. This parameter is an array, so you can pass multiple interfaces into it. The following code shows an example of the registerClass method.
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//register code as an actual class Contoso.Utilities.ChangePasswordValidator.registerClass( 'Contoso.Utilities.ChangePasswordValidator', null, Sys.IDisposable);
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ENUMERATIONS
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The Microsoft AJAX Library provides support for enumerations. These enumerations are simply named integer values. Like enumerations in other languages (C# and Visual Basic included), enumerations provide a more readable and maintainable coding style. You define an enumeration the same way you define a class, by using the prototype property. You then define fields for the class and set their initial value. Finally, you call the registerEnum method of the Type class (which is used to extend the JavaScript library). The following is an example of an enumeration created to define a password s strength.
ChAPTER 9
Working with Client-Side Scripting, AJAX, and jQuery
//create and register an enumeration Contoso.Utilities.PasswordStrength = function(){}; Contoso.Utilities.PasswordStrength.prototype = { Weak: 1, Medium: 2, Strong: 3 } Contoso.Utilities.PasswordStrength.registerEnum( "Contoso.Utilities.PasswordStrength");
INHERITANCE
Support for inheritance is also available with the Microsoft AJAX Library. This allows a JavaScript class to inherit the properties and methods of a base class. Of course, the inheriting class can also override those properties and methods. This is similar to inheritance in other object-oriented languages. You implement inheritance through the registerClass method discussed earlier by setting the baseType property during registration. This enables single inheritance (similar to how the .NET Framework works). If you want to override a function, you simply redefine it by using the same name in the new class.
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