Register javascript inside User Control using C#

I want to call javascript function from User Control using C#. For that i am trying to use

ScriptManager.RegisterStartupScript(this, typeof(string), "alertbox", "javascript:ShowPopup('Select a row to rate');", true); 

but it is not wor开发者_如何学Goking for me. This works fine on the page. Can some one help me out how can i call javascript function at runtime using C#.

Thanks,

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Try this.GetType() instead of typeof(string):

ScriptManager.RegisterStartupScript(this, this.GetType(), "alertbox", "ShowPopup('Select a row to rate');", true); 

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The following is taken from working code, showing script being registered to fire from an asynchronous postback in an UpdatePanel.

ScriptManager.RegisterStartupScript( this.upnl, this.upnl.GetType(), Guid.NewGuid().ToString(), "alert('test');", true );

If your code is not executed from inside an UpdatePanel, it still should not be typeof(string); you should use the type of some container (typically the control itself).

Type: The type of the client script block. This parameter is usually specified by using the typeof operator (C#) or the GetType operator (Visual Basic) to retrieve the type of the control that is registering the script.

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Im not sure if this is the best way to do it but for my user controls that use javascript i have a public string property on the user control and register it in the page.

// sudo code

eg. UserControl

    {

   public bool CustomBool
   { 
     get
     {
       //logic 
       return value;
     }
    }

    public string Javascript
    {
        get { return "javascript...."; }
    }
  }

in page

{

    page load()
    {
         if (Usercontrol.CustomBool)
         {
               ScriptManager.RegisterStartupScript(this, typeof(string), "alertbox", UserControl.Javascript, true);
         }
    }
}

The downside for this is you have to remember to register the scripts on the page. it does work though

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Try it without the "javascript:" in the script string:

ScriptManager.RegisterStartupScript(this, typeof(string), "alertbox",  "ShowPopup('Select a row to rate');", true); 

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I find that the string given is embedded literally, so it's necessary to enclose it in a suitabie <script type='text/javascript' language='javascript'> and </script>