In order to check your issue, I would need your runable sample. Your attached sample seems not working in here. It is missing WebProcess.ascx. So, could you reattach your working sample? Thanks.

Hello Hendrik ,

  I am so sorry for my mistake . I have reattached my sample ! Thank you for your help !

Hello Hendrik ,

   Thank you for your reply . My simple sample is just to simulate the function of Delete . I click the icon of the last column named Delete to invoke the javascript code of showing the message box , then if I confirm to delete the item , it will trigger a hidden button to invoke the background program of Delete .

  If the problem is coming from UpdatePanel itself , why it shows normal in IE Browser and there will be a problem in Firefox Browser ?  If the method of showing the message box is "confirm" , there will be ok in the two Browsers . But the method of showing the message box is "ShowInfoBox" you provide , there will be the problem in Firefox Browser .

  I have changed my code , and there is no  "wdlg_ButtonOK_Clicked(dlgBox.EpointParams)" . The problem is the same with before . Thank you for your help .

Hi,

I found solution for the issue. The issue occurs because when closed dialogbox, the process has not finished yet and it is interrupted by FullPostBack request. So, to resolve the issue, I used timeout after called close dialog box function. I also remove some code which I think is not important. see below the code after modify :

function ShowInfoBox(msg, funcOK) {
var wInfoBox = ISGetObject("wdlgWaitInfo");
var span = document.getElementById("span_Message");
span.innerText = msg;


wInfoBox.ShowDialog();
}

function wdlgWaitInfo_OnButtonClicked(controlId, dialogButton) {
var dlgBox = ISGetObject("wdlgWaitInfo");
dlgBox.CloseDialog();
if (dialogButton.Type == "OK") {
window.setTimeout(function(){ConfirmDelete()},100);
}
}

function Delete() {
ShowInfoBox("Confirm Delete?");
}

function ConfirmDelete() {
document.getElementById("<%= btnDelete.ClientID %>").click();
}