Call a code behind function from javascript in aspx

Question

I have a page where a javascript will be triggered when the user closes the browser tabs / browser window. Language is in c# thanks.

im using window.onbeforeunload, something along the line like this:

<script type="text/javascript">


    window.onbeforeunload = myFunction;


function myFunction()
{
    //call my function here
}

the code behind function will be a simple function for now, so no input parameters or return value are needed. So i'll just like to know how to call my function (eg: public void callMyFunction())

I think you're confused here... javascript code runs in the browser (client) and C# code runs in the server. You can't call C# code from javascript. At most, you could call a webservice exposed on the server via an AJAX call. — axel_c
– axel_c, Commented Apr 29, 2010 at 10:19
Or use Page Methods. Good tutorial: singingeels.com/Articles/Using_Page_Methods_in_ASPNET_AJAX.aspx — Joop
– Joop, Commented Apr 29, 2010 at 10:35
@axel_c~ What makes you think that you can't call c# code from javascript? I've done it many times.. Just call button.click() from your javascript and be suprised! — Pabuc
– Pabuc, Commented Jan 5, 2011 at 7:27
@Pabuc that's triggering a client-side event that happens to post back to the server and execute C# code, not directly calling C# code from javascript. It's a different thing. — axel_c
– axel_c, Commented Jan 5, 2011 at 15:10
well.. Then you should have said "You can't write C# code into javascript function". — Pabuc
– Pabuc, Commented Jan 5, 2011 at 15:17

J. Rattz · Accepted Answer · 2011-01-05 06:17:50Z

3

There are variety mechanisms to call your code-behind function(s). You could use an Ajax Call, Page Methods, ASP.NET Client Callbacks, or even trigger a code-behind handler using an invisible ASP.NET button.

answered Jan 5, 2011 at 6:17

J. Rattz

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Comments

Madhu Beela · Accepted Answer · 2012-01-23 10:25:05Z

0

Try the sample code below:

<html>
<head>
    <script src="scripts/jquery-1.4.4.min.js" type="text/javascript"></script>

    <script type="text/javascript" language="javascript">
        windown.OnUnload(){ function(){ $("#Btn_Click").click();}};
    </script>

</head>
<body>
...

 <asp:Button ID="Btn_Click" runat="server" Text="ButtonClick" onClick="Btn_Click" />
...
</body>
</html>

hope it helps !!!

edited Jan 23, 2012 at 10:25

answered Jan 23, 2012 at 7:49

Madhu Beela

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Comments

Prabhakaran Parthipan · Accepted Answer · 2012-02-06 11:29:04Z

0

By using Ajax you can access code behind method from javascript . Try this code.

<script  type="text/javascript">
     classname.methodname();
    </script>

In code behind page: in page load you need to register follwing code...

pageload()
{
      AjaxPro.Utility.RegisterTypeForAjax(typeof(pagename), this.Page);
}



[AjaxPro.AjaxMethod(AjaxPro.HttpSessionStateRequirement.ReadWrite)]
    public void methodname()
    {
    ..........
    ........
    }

Here classname is code behind page class name

answered Feb 6, 2012 at 11:29

Prabhakaran Parthipan

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