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Comparing software version numbers

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dirtyholmes

dirtyholmes

Programmer
Mar 17, 2004
43
AU
I am new to writing javascript code and i am trying to find a way of comparing software version numbers.

I have some code that needs to check a version of software on the users PC against the recomended version, and find out if the version on the PC is more recent.

eg

var minimumReqVers = 6.00.00.3

( the result of my check on the PC software version could be 6.0.3213 )

so effectively i have

var PCVersion = 6.0.3213

How therefore can i compare these two values to find which is the most recent, which in this example is the PC version.

 
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Assuming you want to check from left to right, the best bet would to be:

- Convert the whole lot to a string
- Split on the '.' characters
- From left to right, convert each array position to a number, comparing it against the same position of the minimum requirements array. If any number is less, you know you've not met the requirements.

Something like this:

Code: 
<html>
<script type="text/javascript">
	var minimumReqVers = '6.00.00.3';
	var PCVersion = '6.0.32.13';

	function hasMetMinimum(minVersion, installedVersion) {
		var minArray = minVersion.split('.');
		var installedArray = installedVersion.split('.');
		for (var loop=0; loop<minArray.length; loop++) {
			if (parseInt(installedArray[loop], 10) < parseInt(minArray[loop], 10)) return(false);
		}
		return(true);
	}

	onload = function() {
		alert('Does ' + PCVersion + ' meet the minimum version number requirements of ' + minimumReqVers + ' ?\n\n' + hasMetMinimum(minimumReqVers, PCVersion));
	}

</script>
</html>

Of course, it's not perfect. At the moment, there is no error checking to make sure both version strings have 4 sets of digits. If, for example, one had 4, and one had 3, unexpected results might occur.

Hope this helps,
Dan

[tt]Dan's Page [blue]@[/blue] Code Couch
[/tt]
 
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