AJAX Request to CodeBehind with returnvalue

[Alexander]

Hi all,

I'am currently evaluating the Telerik ASP.NET AJAX Controls.
I'am missing the functionality to invoke a AJAX Request which should call a function in the codebehind class asynchronly by providing a callbackfunction. The codebehindclass should return a value and call the callbackclass i provided with the returnvalue.

This works with WebServices which i registered within the ScriptManager but i think there must also be posibillity to do this with the CodeBehind Class. I've seen som peoples doing this, by using the function:
private void RadAjaxManager1_AjaxRequest(object sender, AjaxRequestEventArgs e)
{
 //code to handle the generic AJAX request
}
But then i need to return the value by putting it into a hidden input field. Thats no solution for me because i have several asynchron requests.

I hope you can help me.

Thank you

Alex

[Veli]

Hello Alexander,

In this case you can try the following. Define a javascript callback function in your page. The function will take as parameter a string value returned from the server.

Then, in RadAjaxManager's server-side AjaxRequest event, register a response script that will call this callback function with any string parameter you give it from the server. The server-side event will look like:

void RadAjaxManager1_AjaxRequest(object sender, Telerik.Web.UI.AjaxRequestEventArgs e)
{
    RadAjaxManager1.ResponseScripts.Add(String.Format("callBack('{0}')", "Server Response!"));
}

where callback() is my callback function defined in the HTML that will receive my server-returned parameter.

Best wishes,
Veli
the Telerik team

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