For code example and a more detailed explanation, check the thread on the Sencha forum:
I’ve been trying to open a popup window on selecting an item from a ComboBox in ExtJS and on opening the window, using
the popup would start loading and then quickly move below the current page. The behavior i observed only happened in IE6, Firefox loaded the popup fine and it stayed on top. With a bit of research and debugging on my own, i came to find out that something in the ExtJS code was causing the focus to return the <body> element of the main page. The solution to the problem?
//Function to open the Window
var popup = window.open( "qantume.htm", "Selector", "alwaysRaised=yes, status=0, height=300, width=650, resizable=0" );
//Function calls for opening the window in your code
By delaying the start of the openDelegateWindow code, i am figuring the code execution has enough time to return the focus to the <body> tag, and then the open popup window can start uninterrupted and keep the focus on the popup window.
For your reference also i have found this script, which is helpful in making your popup quasi modal in that it checks the focus to make sure that it is not away from the current popup window, unless the focus is on one of the controls within the popup window. If the focus is anywhere else, it is rendered back to the popup window, making it basically stay on top until the user closes it. This is not foolproof, there are ways around, but they are really for the “I really need to break your script” type of user, as explained by the author. You can find it here: