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AJAX .NET -- Timer control -- How to call a Javascript function?

Posted on 2008-10-03
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Last Modified: 2013-11-08
Hello,

I have a AJAX.NET Timer control running in a page and it polls the server every 5 seconds.  I need it to call a Javascript function.  Is this even possible?  Any ideas?

In the included code snippet, you'll see that I'm trying to force a write of "alert('hi!');"  That doesn't work, but I need to do something like that.

Thanks
protected void timerPoll_Tick(object sender, EventArgs e)
    {
        Label1.Text = "The time is: " + DateTime.Now.ToShortTimeString();
 
        Literal1.Text = "alert('hi!');";
    }

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Question by:sushik15
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ororiole earned 1500 total points
ID: 22643656
No, that is not possible. You can create javascript from the server side with something like this:

        Page.ClientScript.RegisterStartupScript(typeof(Page), "script1", "alert('Hi');", true);

if you do it while the page is still processing on the server, for instance in the Page_Load handler. The server has to render the script to the browser in the response, just like the other controls. During an async postback, it can't render script to the page.

You could however write a javascript function to do something every five seconds (not using a timer control). its clock would be more or less synchronized with the async timer control, but they would work independently of each other. It wouldn't necessarily occur write after you poll the server. If you want that to happen you would have to write it all in javascript. If you are interested in that you could start by looking here at the timer information:
http://grizzlyweb.com/webmaster/javascripts/refresh.asp

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