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glasner/beforeunload.coffee

Created February 26, 2012 21:52
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AJAX on beforeunload for Chrome
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beforeunload.coffee
sleep = (duration) ->
milliseconds = -> new Date().getTime()
start = milliseconds()
runningFor = milliseconds() - start
while runningFor < duration
runningFor = milliseconds() - start
$('div') # has to actually do something for it to work
window.addEventListener 'beforeunload', (e) ->
# make *sync* ajax call
sleep 1000
return undefined
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glasner commented Feb 26, 2012

If the beforeunload handler times out, Chrome will run previous code but not show the "Do you want to leave" dialog.

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glasner commented Feb 26, 2012

Should mention the code to sleep was born from http://www.phpied.com/sleep-in-javascript/

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