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ScriptReference Class

Registers an ECMAScript (JavaScript) file for use on an ASP.NET Web page.

Namespace:  System.Web.UI
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

'Declaration
<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class ScriptReference
'Usage
Dim instance As ScriptReference

You can include a JavaScript file on an ASP.NET Web page by registering it through a ScriptReference object. You can register a script file that is located as a .js file (a static script file) on the Web site. You can also register a script file that is embedded as a resource in an assembly. After registering the script file, you can use its functions in client script on the Web page.

To register a static script file, set the Path property of the ScriptReference object to the relative location of the file.

To register a script file that is embedded as a resource in an assembly, set the Assembly property to the name of the assembly that contains the file. Then set the Name property to the name of the .js file that is embedded in the assembly. In that case, the script file must be embedded, not linked.

You set the ScriptMode property to indicate whether to use the debug or release version of the script.

The Auto value produces different results depending on whether it refers to a standalone script file or to a script file that is embedded as a resource in an assembly. A standalone script file is defined with the Path property. An assembly reference must be accessed through the Name and Assembly properties. The results for the Auto value are as follows:

  • When it is applied to a standalone script file where the Path property is specified, the Auto value is equivalent to Release.

  • When it is applied to a script reference in an assembly, Auto is equivalent to Inherit. When only Name is specified, it is used to reference the script. When Name and the Path property are both specified, the Path property is used instead of Name, but the Auto value is still equivalent to Inherit.

The following example shows how to reference a custom control and a JavaScript file that is embedded in the control assembly. The assembly is assumed to be in the Bin folder of the Web site. The custom control animates UpdatePanel controls. The JavaScript file is compiled as an embedded resource that is named SampleControl.UpdatePanelAnimation.js. You register the embedded JavaScript file by using the Assembly and Name properties.

To use this example, compile the JavaScript file that is shown in the example as an embedded resource with the custom control. Put the resulting assembly into the Bin folder of the Web site. For an example of how to embed a JavaScript file in an assembly, see Walkthrough: Embedding a JavaScript File as a Resource in an Assembly.

The following example shows a page that uses the custom control.

<%@ Page Language="VB" AutoEventWireup="true" %>

<%@ Register TagPrefix="Samples" Namespace="SampleControl" Assembly="SampleControl" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"  
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>ScriptReference</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1" 
                                 EnablePartialRendering="True"
                                 runat="server">
             <Scripts>
                <asp:ScriptReference Assembly="SampleControl" Name="SampleControl.UpdatePanelAnimation.js" />
             </Scripts>
            </asp:ScriptManager>


            <Samples:UpdatePanelAnimationWithClientResource 
                     ID="UpdatePanelAnimator1"
                     BorderColor="Green"
                     Animate="true"
                     UpdatePanelID="UpdatePanel1"
                     runat="server" >
            </Samples:UpdatePanelAnimationWithClientResource>
            <asp:UpdatePanel ID="UpdatePanel1" 
                               UpdateMode="Conditional"
                               runat="server">
                <ContentTemplate>
                    <asp:Calendar ID="Calendar2" 
                                  runat="server">
                    </asp:Calendar>
                </ContentTemplate>
            </asp:UpdatePanel>
        </div>
    </form>
</body>
</html>

The following example shows the custom control class definition.

Imports System.Web.UI
Imports System.Drawing
Imports System.Globalization

Public Class UpdatePanelAnimationWithClientResource
    Inherits Control

    Private _updatePanelID As String 
    Private _borderColor As Color
    Private _animate As Boolean 

    Public Property BorderColor() As Color
        Get 
            Return _borderColor
        End Get 
        Set(ByVal value As Color)
            _borderColor = value
        End Set 
    End Property 

    Public Property UpdatePanelID() As String 
        Get 
            Return _updatePanelID
        End Get 
        Set(ByVal value As String)
            _updatePanelID = value
        End Set 
    End Property 

    Public Property Animate() As Boolean 
        Get 
            Return _animate
        End Get 
        Set(ByVal value As Boolean)
            _animate = value
        End Set 
    End Property 

    Protected Overrides Sub OnPreRender(ByVal e As EventArgs)
        MyBase.OnPreRender(e)
        If (Animate) Then 

            Dim updatePanel As UpdatePanel = CType(Me.FindControl(UpdatePanelID), UpdatePanel)

            Dim script As String = String.Format( _
                   CultureInfo.InvariantCulture, _
                   "Sys.Application.add_load(function(sender, args) {{var {0}_borderAnimation = new BorderAnimation('{1}');var panelElement = document.getElementById('{0}');if (args.get_isPartialLoad()) {{{0}_borderAnimation.animate(panelElement);}}}});", _
                   updatePanel.ClientID, _
                   ColorTranslator.ToHtml(BorderColor))


            ScriptManager.RegisterStartupScript( _
                Me, _
                GetType(UpdatePanelAnimationWithClientResource), _
                ClientID, _
                script, _
                True)
        End If 
    End Sub 
End Class

The following example shows the supporting JavaScript file.

BorderAnimation = function(color) {
    this._color = color;
}

BorderAnimation.prototype = {
    animate: function(panelElement) {
        var s = panelElement.style;
        s.borderWidth = '2px';
        s.borderColor = this._color;
        s.borderStyle = 'solid';

        window.setTimeout(
            function() {{
                s.borderWidth = 0;
            }},
            500);
    }
}

The following example shows code that you must add to the AssemblyInfo file of the project that contains the custom control and the JavaScript file.

<Assembly: System.Web.UI.WebResource("SampleControl.UpdatePanelAnimation.js", "application/x-javascript")> 

System.Object
  System.Web.UI.ScriptReference

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5

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