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Totalling dynamically created textboxes on blur

Posted on 2007-11-29
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Last Modified: 2013-11-07
I have an asp.net page coded in vb.net that has dynamically created textboxes that hold amounts.
The textboxes are created when a user inputs how many boxes they need and clicks a "create boxes" button.  The boxes appear, the user then enters values into the boxes.  I currently have another button that says "total" and when clicked totals all the boxes.  But is there a way to create a javascript function that will total the boxes automatically on the blur event of the amount textbox? I know I can add the event "onBlur" when the textbox is created, but where I am getting stuck is the creating of the total function.  
Issue: a postback has to occur for the program to see the dyanamically created textboxes, for them to be accessed by a javascript function - correct?  Therefore, if a postback is already occurring, should I not just do the totaling in the postback, after the textboxes are recreated?  
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Question by:JaCrews
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Jeff Certain earned 2000 total points
ID: 20374199
No postback is required -- the javascript runs completely on the client.

Part of the challenge comes in being able to iterate through the controls on the documents and identify which ones to total. In the past, I've done this using a naming convention.

The code snippet below is somewhat simple -- it assumes that all text boxes have numerical input, will add empty text boxes, only supports 50 text boxes, assumes that the text boxes are numbered sequentially and contiguously from 0, etc.
<script language="javascript" type="text/javascript">
		
			function GetTotal()
			{
				var total = 0;
			  for(i = 0; i < 50; i++)
			  {
			    var ctl = document.getElementById('controlPrefix' + i);
			    if (ctl==null)
						return total;
			    else
			    {
			      total = total + ctl.value;
			    }
			  }
			  
			  return total;
			}
	</script>

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