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[Solved] RadAjaxManager and Panel inside a FormView

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Ajax

This is a migrated thread and some comments may be shown as answers.

Sima Ganji asked on 06 Jul 2009, 05:49 PM

Hi Folks,

I have a FormView that contains a RadComboBox named ComboBox1 and a few other controls which I need to show or hide based on the ComboBox1 selected value using SelectedIndexChanged event.I put those controls inside a panel named Panel1.
This is the setting in the code behind:

protected v

oid Page_PreRenderComplete(object sender, EventArgs e)

{

RadComboBox item1 = (RadComboBox)MyFormView.FindControl("ComboBox1");

Panel panel1 = (Panel)MyFormView.FindControl("Panel1");

RadAjaxManager.GetCurrent(Page).AjaxSettings.AddAjaxSetting(item1 , panel1);

}

When I run the app and change the combobox1 value, I get this error: Unknown runtime error.
debuged it the error comes from

"updatePanelElement.innerHTML=rendering;" line

The thing is it works when I use another control but not the panel inside the FormView.

Thanks in advance for your help.
Sima

3 Answers, 1 is accepted

answered on 07 Jul 2009, 01:49 PM

Hello Sima,

I am afraid that the provided information is not enough to determine the exact source of the issue you are facing. At this point it will be best if you open a formal support ticket and send us a simple working project that isolates the problem so we can check it.
Meanwhile I suggest you handles on Page_PreRender event instead of Page_PreRenderComplete and let me know if it makes any difference.

Best wishes,
Pavlina
the Telerik team

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answered on 07 Jul 2009, 04:35 PM

Hi Pavlina,

Thanks for your reply.I tried Page_PreRender instead of Page_PreRenderComplete and I still get the same error.I suspect that ajaxifying a Panel inside a FormView might be having problem.Because when I use another control like RadTextBox to be updated after ComboBox1 selected value changes,it works fine.

protected void Page_PreRenderComplete(object sender, EventArgs e)

{
    RadComboBox item1 = (RadComboBox)MyFormView.FindControl("ComboBox1");
    //This Works
    RadTextBox text1 = (RadTextBox )MyFormView.FindControl("Text1");
    RadAjaxManager.GetCurrent(Page).AjaxSettings.AddAjaxSetting(item1 , text1);
    //This does not work
    //Panel panel1 = (Panel)MyFormView.FindControl("Panel1");
    //RadAjaxManager.GetCurrent(Page).AjaxSettings.AddAjaxSetting(item1 , panel1);
   }
When I change selection from ComboBox1, Text1 will be shown or hidden according to the ComboBox1.SelectedValue without getting any error.there are like 10 controls which I need to hide or show when ComboBox1 value is changed.I wrap them inside a panel to be able to hide or show all those controls at once.So in my FormView I have some controls,ComboBox1,Panel1 which includes 10 table rows containing those controls.
This is the ComboBox1 SelectedIndexChanged event handler:

protected void ComboBox1_SelectedIndexChanged(object sender, EventArgs e)

{

RadComboBox item1= (RadComboBox)sender;

     long itemValue= Convert.ToInt64(item1.SelectedValue);
    //This Works
    //RadTextBox text1 = (RadTextBox )MyFormView.FindControl("Text1");
    //text1 .Visible = ShowOrHide(itemValue);
   //This doesn't work

Panel panel1= (Panel)MyFormView.FindControl("Panel1");

panel1.Visible = ShowOrHide(itemValue);

}
Please Let me know if you still want me to send you the code.
Thanks.
Sima