'onblur' problem

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From	"Mel Smith" <med_cutout_syntel@aol.com>
Newsgroups	comp.lang.javascript
Subject	'onblur' problem
Date	Mon, 18 Mar 2013 12:55:40 -0700
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HI:

    I have a <select> tag on a page that is on focus as soon as the user 
opens the page with his browser, and also that has the following 'onblur' 
property:

    <select etc, etc.,   onblur="chkentrymethod();" >
    ...several options here ...
    </select>

Normal Operation:
     If the user fails to 'select' one of the several options in the 
<select> tag, and instead focuses on another field,  I immediately 'alert' 
the user and re-focus back on the <select> element. I do this until he 
'selects' one of the options. Works good !

Problem Operation (at least for IE8) :
    If the user clicks the 'X' (eXit the browser) button in the top-right 
corner *before* selecting an option, my IE8 browser senses the 'onblur' 
event and shows the alert message -- even though by that time the browser 
has already shutdown.  Very messy of me to allow this.

Question:
    How can I sense that the user is simply closing down the browser, and 
stop the onblur event from presenting the alert() message.

Thank you.
-- 
Mel Smith

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'onblur' problem "Mel Smith" <med_cutout_syntel@aol.com> - 2013-03-18 12:55 -0700
  Re: 'onblur' problem Stefan Weiss <krewecherl@gmail.com> - 2013-03-18 21:14 +0100
    Re: 'onblur' problem "Mel Smith" <med_cutout_syntel@aol.com> - 2013-03-18 17:45 -0700

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