Modal popup strange display behaviour on post back

Question

User669412048 posted

While using Ajax control toolkit in my website and I have created Ajax control toolkit modal popup extender in my page.
Every thing is working fine but when I am pressing any button on page or selecting any dropdownlist page reloads and it shows My modal popup extender for few seconds. It disappears when page is completely reloads.

How to solve this issue?

Answer 1

User1724605321 posted

Hi newLearner_asp ,

Every thing is working fine but when I am pressing any button on page or selecting any dropdownlist page reloads and it shows My modal popup extender for few seconds. It disappears when page is completely reloads.

Ajax modal popup closes if any controls present on it causes a postback .You could call the ModalPopupExtender.show() method to bring up the popup again after post back in button click event or OnSelectedIndexChanged event of dropdownlist:

protected void OnSelectedIndexChanged(object sender, EventArgs e)

{
    //Do work
    ModalPopupExtender.Show();

}

You could refer to links below for details and demo:

http://www.aspsnippets.com/Articles/Solution-ASPNet-AJAX-ModalPopupExtender-Modal-Popup-Closes-on-PostBack.aspx .

http://stackoverflow.com/questions/6157168/preventing-modalpopupextender-from-closing-during-after-postback .

Best Regards,

Nan Yu

Answer 2

User177399542 posted

Hi 

           To stop showing your Ajax control toolkit modal popup extender on postbacks make your Panel visible false. Example:

<asp:Panel ID="PnlPopup" runat="server" Visible="false" CssClass="message">