Calling Radprompt from code behind with RadAjaxManager

[cheekl]

I have a web form with 2 radbutton. Approve and Reject. When Reject button is clicked. I would like to pop up radprompt to capture reject reason and update the reason via stored proc from code behind.
How can I capture the reason and using it from code behind?

[Shinu]

Hello Cheekl,

Check out the following code library submission which explains how to call a radalert from codebehind. You can try the same approach to achieve your scenario.
Calling radalert from codebehind (all versions of RadWindow).

From the version 2011.1.315 the predefined dialogs (radalert, radconfirm and radprompt) can be called by using the new server methods RadAlert, RadConfirm and RadPrompt of the RadWindowManager.
Check out the following demo for more on this.
Window / Alert, Prompt, Confirm.

Thanks,
Shinu.

[cheekl]

Thanks for the help. I manage to call up the radprompt and trigger the callback function with the code behind
    protected void btnReject_Click(object sender, EventArgs e)
    {
        try
        {
            RadAjaxManager1.ResponseScripts.Add(@"radprompt('Reject reason', promptCallBackFn, 330, 160, null, 'Reject', '')");
        }

However in the promptCallBackFn, I am trying to assign the value return to a asp:label and the object is null
      function promptCallBackFn(args)
      {
          var lbl = $find("<%=lblRejectReason.ClientID %>");
          lbl.text = args;          
      }      

I believe it is something to do with Ajax where the control is not loaded, how can I overcome this?

[Iana Tsolova]

Hi Cheekl,

You should use $get() to get reference to the label client-side object. The $find() method is used only for script controls/components.

http://msdn.microsoft.com/en-us/library/bb397717.aspx
http://msdn.microsoft.com/en-us/library/bb397441%28v=VS.100%29.aspx

Best wishes,
Iana
the Telerik team

[cheekl]

I still get a null value from $get

      function promptCallBackFn(args)
      {
          var lbl = $get("lblPromptValue");
          lbl.text = args;          
      }

lblPromptValue is a hidden label.
<asp:Label ID="lblPromptValue" runat="server" Text="" Visible="false"></asp:Label>

[Iana Tsolova]

Hello Cheekl,

What if you change the code like this:

function promptCallBackFn(args)
 {
     var lbl = $get("<%= lblPromptValue.ClientID %>");
     lbl.innerHTML = args;
 }

Best wishes,
Iana
the Telerik team

[cheekl]

I found the problem. It is because I set lblPromptValue visible = false.