Error registering client script block when using master page in an ASP.NET application

Question

I've got this code from Mads Kristensen's blog to display a message box on an ASP.NET client's page using Javascript:

public static class Alert
{
    public static void Show(string message)
    {
        // Cleans the message to allow single quotation marks 
        string cleanMessage = message.Replace("'", "\\'");
        string script = "<script type=\"text/javascript\">alert('" + cleanMessage + "');</script>";

        // Gets the executing web page 
        Page page = (Page)HttpContext.Current.CurrentHandler;

        // Checks if the handler is a Page and that the script isn't allready on the Page 
        if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert"))
        {
            page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script, false);
        }
    }
}

And it works fine when there is no master page involved. However, when I call it (on the server side) from a master page derived page it doesn't work. I'm guessing it is something related to the RegisterClientScriptBlock() method, but I don't know what. Can someone show me the way to solve this?

Hi Greg, didn't notice your comment here. Actually no error message is shown, the "alert" pop up box simply doesn't show up when the "Show" method is called in a child page, but everything works when it is called in a master page. — Thomas C. G. de Vilhena
– Thomas C. G. de Vilhena, Commented Mar 11, 2012 at 14:17

Thomas C. G. de Vilhena · Accepted Answer · 2012-03-11 15:36:25Z

1

Just in case anyone stumbles on this, I found out a workaround to my issue. It happens that my master page has its ContentPlaceHolder tag inside an UpdatePanel so when I replaced:

page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script, false);

By:

ScriptManager.RegisterStartupScript(page, page.GetType(), "alert", script, false);

The alert message box started showing up on all pages.

answered Mar 11, 2012 at 15:36

Thomas C. G. de Vilhena

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