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Detecting events in IE

Posted on 2008-10-30
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Last Modified: 2013-12-08
Hi!

I have a ascx webpart for my Sharepoint.
I am trying to detect users closure / navigation away from a specific page that they are viewing.

EG: If they are inputting some fields and they some how accidently click the CLOSE button in the browser, click the BACK button, or keyboard BACKSPACE, is there anyway i can catch that and prompt the user: YOU ARE NAVIGATING AWAY FROM THIS PAGE. ARE YOU SURE?

Please advice.
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Question by:daphneySG
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by:Dhaest
ID: 22849171
Javascript Tip: Catch Browser Closing Event
http://blogs.x2line.com/al/articles/756.aspx
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Dhaest earned 125 total points
ID: 22849173
Trap window close event for IE browser
Let's say you want to trap the window close event for the web browser so that you can give a confirmation dialog asking if the user is sure to leave the page. The problem is that there is no onclose event for the window object. The closest event might be onunload since it fires immediately before the window object is unloaded. However, when the onunload event fires it is too late to display a JavaScript alert. Therefore, we need an event that fires prior to a page being unloaded, which is onbeforeunload. Define onbeforeunload event in your page <BODY> element as follows:



<BODY onbeforeunload="HandleOnClose()">



Then, add the following JavaScript code into the <HEAD> section of your ASPX page:



<script language="javascript">
<!--



function HandleOnClose() {
  if (event.clientY < 0) {
     event.returnValue = 'Are you sure you want to leave the page?';
  }
}



//-->
</script>



The trick here is to check clientY property of the event object, which is used to set or retrieve the y-coordinate of the mouse pointer's position relative to the client area of the window, excluding window decorations and scroll bars. This way, you can detect if the user clicked on X button to close the page, or clicked on Refresh button to refresh the page, etc. This approach does not handle key events such as Alt-F4 that lets the user close the window by using the keyboard. You have to handle keyboard events separately

Source: http://www.developerfusion.com/forum/thread/24783/
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