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Execute JavaScript function from ASP.NET codebehind


From Suprotim Agarwal  blog. 

Calling a JavaScript function from codebehind is quiet simple, yet it confuses a lot of developers. Here's how to do it. Declare a JavaScript function in your code as shown below:
JavaScript
<head runat="server">
    <title>Call JavaScript From CodeBehind</title>
    <script type="text/javascript">
        function alertMe() {
            alert('Hello');
        }
    </script>
</head>
In order to call it from code behind, use the following code in your Page_Load
C#
protected void Page_Load(object sender, EventArgs e)
{
    if (!ClientScript.IsStartupScriptRegistered("alert"))
    {
        Page.ClientScript.RegisterStartupScript(this.GetType(),
            "alert", "alertMe();", true);
    }
}
VB.NET
If (Not ClientScript.IsStartupScriptRegistered("alert")) Then
    Page.ClientScript.RegisterStartupScript _  
    (Me.GetType(), "alert", "alertMe();", True)
End If
The Page.ClientScript.RegisterStartupScript() allows you to emit client-side script blocks from code behind. More info here http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerstartupscript.aspx
To call the JavaScript code on a button click, you can add the following code in the Page_Load
btnCall.Attributes.Add("onclick", " return alertMe();");


For more info : 




Calling JavaScript from ASP.NET Master Page and Content Pages - Part I


Calling JavaScript from ASP.NET Master Page and Content Pages - Part II









































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