c# barcode maker Lesson 2: Creating Client Scripts with the Microsoft AJAX Library in Visual C#.NET

Generation QR in Visual C#.NET Lesson 2: Creating Client Scripts with the Microsoft AJAX Library

Lesson 2: Creating Client Scripts with the Microsoft AJAX Library
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The next step is to create a class-level variable to represent the ScriptManager that works with the control. You can declare this variable and then override the OnPreRender event of the control to set its value. You do so by calling the ScriptManager.GetCurrent static method and passing in the page containing the control. The following shows an example.
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Sample of Visual Basic Code Private _sMgr As ScriptManager Protected Overrides Sub OnPreRender(ByVal e As EventArgs) If Not Me.DesignMode Then 'test for the existence of a ScriptManager _sMgr = ScriptManager.GetCurrent(Page) If _sMgr Is Nothing Then _ Throw New HttpException( _ "A ScriptManager control must exist on the page.") _sMgr.RegisterScriptControl(Me) End If MyBase.OnPreRender(e) End Sub Sample of C# Code private ScriptManager sMgr; protected override void OnPreRender(EventArgs e) { if (!this.DesignMode) { //test for the existence of a ScriptManager sMgr = ScriptManager.GetCurrent(Page); if (sMgr == null) throw new HttpException( "A ScriptManager control must exist on the page."); sMgr.RegisterScriptControl(this); } base.OnPreRender(e); }
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Next, you define the properties of the control that users will set. In the password example, there are properties defined for the three style class names that should be set on the text box for each of the password strengths (weak, medium, and strong). You can add fields or properties to the server control to represent these items. You then create a GetScriptDescriptors method to map these properties or fields to properties of the control. The following shows an example.
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Sample of Visual Basic Code Public WeakCssClass As String Public MediumCssClass As String Public StrongCssClass As String Protected Overridable Function GetScriptDescriptors() _ As IEnumerable(Of ScriptDescriptor) Dim descriptor As ScriptControlDescriptor = _ New ScriptControlDescriptor("AjaxEnabled.PassTextBox", Me.ClientID) descriptor.AddProperty("weakCssClass", Me.WeakCssClass) descriptor.AddProperty("mediumCssClass", Me.MediumCssClass) descriptor.AddProperty("strongCssClass", Me.StrongCssClass) Return New ScriptDescriptor() {descriptor} End Function Sample of C# Code public string WeakCssClass; public string MediumCssClass; public string StrongCssClass; protected virtual IEnumerable<ScriptDescriptor> GetScriptDescriptors() { ScriptControlDescriptor descriptor = new ScriptControlDescriptor("AjaxEnabled.PassTextBox", this.ClientID); descriptor.AddProperty("weakCssClass", this.WeakCssClass); descriptor.AddProperty("mediumCssClass", this.MediumCssClass); descriptor.AddProperty("strongCssClass", this.StrongCssClass); return new ScriptDescriptor[] { descriptor }; }
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You must also register the actual JavaScript code to be used by your control. You do so by writing a GetScriptReferences method. This method references the .js file that you intend to use to extend your custom control. There are two ways to implement this method, one for controls in the App_Code directory of the website and another for controls you create as stand-alone assemblies. The following code shows an example of the former, a custom control created in the website s App_Code directory and referencing a JavaScript file in the same website.
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Sample of Visual Basic Code Protected Overridable Function GetScriptReferences() _ As IEnumerable(Of ScriptReference) Dim reference As ScriptReference = New ScriptReference() reference.Path = ResolveClientUrl("PasswordStrength.js") Return New ScriptReference() {reference} End Function
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Lesson 2: Creating Client Scripts with the Microsoft AJAX Library
ChAPTER 9
Sample of C# Code protected virtual IEnumerable<ScriptReference> GetScriptReferences() { ScriptReference reference = new ScriptReference(); reference.Path = ResolveClientUrl("PasswordStrength.js"); return new ScriptReference[] { reference }; }
The latter method, embedding the control in its own assembly, is covered in Practice 3 at the end of this lesson. To use the custom control, you register it with the page and then define its tag. For example, to use the password strength custom control created inside the App_Code directory, you add the following directive to the top of your webpage source.
<%@ Register Namespace="AjaxEnabled" TagPrefix="AjaxEnabled" %>
You then add a ScriptManager to your page. You can then define the control s markup as you would any other server control. The following shows the control in the example. Notice that the three properties of the control that manage the style of the text box are being set declaratively to style class names defined elsewhere on the page.
<asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <AjaxEnabled:PassTextBox ID="textbox1" runat="server" TextMode="Password" WeakCssClass="weak" MediumCssClass="medium" StrongCssClass="strong"></AjaxEnabled:PassTextBox>
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