BUG: Window Closes When a User Clicks Cancel to Cancel Closing a Window Created with the window.showModalDialog() Function

When you set event.returnValue in the OnBeforeUnload event for a window, the user is prompted by Internet Explorer about whether they want to close the current window. If the user clicks Cancel in the modal dialog box to cancel closing the window, the window closes anyway.

This behavior affects windows that are created with the window.showModalDialog function and the window.showModelessDialog function. Note that the window.open function works correctly.

Internet Explorer 5.01

To resolve this problem, obtain the latest service pack for Internet Explorer 5.01. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Workaround

To work around this problem, use the window.open function to create the window.

Internet Explorer 5.01

Microsoft has confirmed that this is a problem in Internet Explorer 5.01. This problem was first corrected in Internet Explorer 5.01 Service Pack 1.

Internet Explorer 5.5

Microsoft has confirmed that this is a problem in Internet Explorer 5.5.

For more information about developing Web-based solutions for Microsoft Internet Explorer, visit the following Microsoft Web sites: