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timmerk · Oct 8, 2003, 02:40 PM

Hi,

Anyone know of a short, clean javascript function that checks if the value of something is an IP address, i.e., all numbers, with decimals, and only max of 3 numbers between decimals, and doesn't go over 255, etc. If it doesnt check the 255 or 3 max thing, that's fine. I haven't decided if I want to add those in yet. Thanks!

Arkham_c · Oct 8, 2003, 06:08 PM

Originally posted by timmerk:
Hi,

Anyone know of a short, clean javascript function that checks if the value of something is an IP address, i.e., all numbers, with decimals, and only max of 3 numbers between decimals, and doesn't go over 255, etc. If it doesnt check the 255 or 3 max thing, that's fine. I haven't decided if I want to add those in yet. Thanks!

Here's one I whipped up just now. I think it should work:

[php]
<html>
<head>
<script language="JavaScript">
function isIPAddress(form_ip)
{
var fields = form_ip.split(".");
var size = fields.length;
if ( size != 4 )
{
return false;
}
for ( var i=0; i<4; i++)
{
var field = parseInt(fields[i], 10);
if ( isNaN(field) )
{
return false;
}
else if (( field > 255 ) || ( field < 0 ))
{
return false;
}
}
return true;
}
</script>
<form>
<input type="text" name="ip" size="20" value="1.2.3.4" maxlength="15">
<input type="button" name="Test" value="Test"
onClick="alert(isIPAddress(document.forms[0].ip.value))">
</form>
</html>
[/php]

mzllr · 03:50 AM

edit: added code to this thread...