Calling Javascript function from asp.net code behind

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I want to call javascript function from my asp.net code behind page
I have written following code but it is not working

XML

System.Text.StringBuilder sb = new System.Text.StringBuilder();
        sb.Append(@"<script language='text\javascript'>");
        sb.Append(@"BlitzMap.setMapFromKML(document.getElementById('kmlString').value);");
        sb.Append(@"</script>");
        System.Web.UI.ScriptManager.RegisterStartupScript(this, this.GetType(), "JCall1", sb.ToString(), false);

can anyone tell me whats wrong with this code.

Posted 4-May-13 1:58am

sagmali

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[no name] 4-May-13 8:12am

"it is not working" is not at all a helpful description of any kind of a problem. Does your script exist at the time you are trying to call it?

sagmali 5-May-13 22:29pm

Yes it is

Sergey Alexandrovich Kryukov 11-Jun-13 20:00pm

There are no calls from ASP.NET to JavaScript, ever. Please see my comment to Solution 1.
—SA

2 solutions

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Espen Harlinn · Answer 1 · 2013-05-04T02:11:00

Solution 1

Javascript executes in the browser, the codebehind on the server - so actually calling the javascript code from the codebehind would involve a lot of trickery.

I suspect that this isn't really what you attempt to do, you just want something to execute once the document is fully loaded.

If that is the case you could add something like this:

window.onload = function ()
 {
  // Your code goes here...
 };

to your javascript code.

Best regards
Espen Harlinn

Posted 4-May-13 2:11am

Espen Harlinn

Comments

Sergey Alexandrovich Kryukov 11-Jun-13 19:59pm

I would say in in more certain way — there is no a call. OP should understand that ASP.NET just handles HTTP request and produce HTTP response, which can be anything, including JavaScript and HTML+JavaScript. In this scenario (there used to be more unusual server-side JavaScript I don't count), all the JavaScript calls are started from a browser.
—SA

Espen Harlinn 12-Jun-13 16:04pm

It's coming: http://www.w3schools.com/html/html5_serversentevents.asp

Sergey Alexandrovich Kryukov 12-Jun-13 16:35pm

Good to know... :-)
—SA

Thanks7872 · Answer 2 · 2013-05-04T02:18:00

Write your javascript function in head section of your page as you normally do,

C#

<head>

<script type="text/javascript">
yourfunction()

{}
</script>

</head>

and then call it from codebehind like this:

Page.ClientScript.RegisterStartupScript(this.GetType(), "Script", yourfunction(), false);