c# thoughtworks qrcode Lesson 2: Creating Client Scripts with the Microsoft AJAX Library in C#

Drawing QR-Code in C# Lesson 2: Creating Client Scripts with the Microsoft AJAX Library

Lesson 2: Creating Client Scripts with the Microsoft AJAX Library
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Open the newly created JavaScript file. At the top of the file, add code to reference the MicrosoftAjax.js library and to register a new namespace. The following shows an example.
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/// <reference name="MicrosoftAjax.js"/> Type.registerNamespace("AjaxEnabled");
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Next, define the constructor for your JavaScript class as a function. In this case, the constructor takes the element parameter. This is meant to represent the DOM element that the control extends. Use this element to initialize the base class of System.UI.Control. This control will set the style of a text box based on the strength of the password. Therefore, it exposes three properties, one for each password strength. Inside the constructor, initialize the private fields used to represent these properties. The following shows an example of the constructor.
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//create constructor AjaxEnabled.PassTextBox = function (element) { AjaxEnabled.PassTextBox.initializeBase(this, [element]); this._weakCssClass = null; this._mediumCssClass = null; this._strongCssClass = null; }
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The next step is to define the inside of the class by creating its prototype. The prototype of this class will include both an initialize and a dispose method. It will also include event code called onKeyup that handles the text box keyup event. Finally, the code includes several properties for managing the setting and getting of the password style classes. The following shows an example of the prototype definition. Note: Most of this code was covered in the lesson. Refer back to the text if you have trouble following the code.
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//define class AjaxEnabled.PassTextBox.prototype = { //initialize the UI control initialize: function() { AjaxEnabled.PassTextBox.callBaseMethod(this, 'initialize'); this._onKeyupHandler = Function.createDelegate(this, this._onKeyup); $addHandlers(this.get_element(), {'keyup' : this._onKeyup}, this); }, dispose: function() { $clearHandlers(this.get_element()); AjaxEnabled.PassTextBox.callBaseMethod(this, 'dispose'); }, //define keystroke event _onKeyup : function(e) { //get password text
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var pass = this.get_element().value; var strength = this.returnPasswordStrength(pass); switch (strength) { case "Weak": this.get_element().className = this._weakCssClass; break; case "Medium": this.get_element().className = this._mediumCssClass; break; case "Strong": this.get_element().className = this._strongCssClass; break; } }, //define properties get_weakCssClass: function() { return this._weakCssClass; }, set_weakCssClass: function(value) { this._weakCssClass = value; }, get_mediumCssClass: function() { return this._mediumCssClass; }, set_mediumCssClass: function(value) { this._mediumCssClass = value; }, get_strongCssClass: function() { return this._strongCssClass; }, set_strongCssClass: function(value) { this._strongCssClass = value; }, returnPasswordStrength: function(password) { var strPass = new String(password.toString()); if (strPass.length < 5) { return "Weak"; } else { if (strPass.length < 8) { return "Medium"; } else { return "Strong"; } } } }
Lesson 2: Creating Client Scripts with the Microsoft AJAX Library
ChAPTER 9
Finally, add code to the class to register it with the Microsoft AJAX Library by calling the registerClass method of the component. Be sure to indicate that the class inherits the Sys.UI.Control class from the library. The following code shows an example that includes notification to the application that the script has been fully loaded.
//register class as a Sys.Control AjaxEnabled.PassTextBox.registerClass('AjaxEnabled.PassTextBox', Sys.UI.Control); //notify loaded if (typeof(Sys) !== 'undefined') Sys.Application.notifyScriptLoaded();
Save the file. You have completed creating the AJAX UI portion of the control. In the next exercise, you will use this control on a webpage. In Practice 3, you will wrap this script into a custom server control.
E xErcIsE 2 Using the AJAX Client Control on a Webpage
In this exercise, you add the AJAX UI control created in the previous exercise to a webpage and connect it to a text box control.
Continue editing the project you created in the previous exercise. Alternatively, you can open the completed Lesson 2, Practice 2, Exercise 1 project in the sample files installed from the CD. Open the Default.aspx page in Source view. Remove the content inside the BodyContent area of the page. Add a ScriptManager control from the Toolbox to the page. Inside the ScriptManager control, set a reference to the PassTextBox.js file created previously. The following shows an example.
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <asp:ScriptManager ID="ScriptManager1" runat="server"> <Scripts> <asp:ScriptReference Path="PassTextBox.js" /> </Scripts> </asp:ScriptManager> </asp:Content>
2. 3.
Next, add controls under the ScriptManager control that represents a user logon form. This includes a text box control used for entering a password. Your UI controls might look as follows.
<div style="font-size: large; font-weight: bold">User Logon</div> <hr /> <br /> User Name: <br /> <asp:TextBox ID="TextBoxUserName" runat="server" Width="200"></asp:TextBox> <br />
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