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View Full Version : form allowing alphanumeric chars only

Ricky158
11-24-2002, 04:36 AM
i've been messing around with a few codes... they crashed and burned... so i'm turning to you guys again. hopefully you can help.

the subject line basically says it all, but if you need an explanation, here it is...

i'm trying to make a form where people create a username and password. and i've already got a script to make sure that the first letter of the word they write is upper-case. and while they're typing in the textbox, if they type any numbers (0,1,2,3,4,5,6,7,8,9) it a) doesnt show b) automatically erases it. i've seen both variations (a and b), so that's why i bring that up. either one is fine. i have a button right next to the textbox also, that does the upper-case thing... maybe they are allowed to type numbers and all that, but when they click the button, it makes the first letter upper-case AND gets rid of the numbers... whaddaya think? could it work?

thanks for the help.
whammy
11-24-2002, 01:05 PM
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" >
<head>
<title>Letters ONLY</title>
<script type="text/javascript">
<!--
function alpha(e) {
var k;
document.all ? k = parseInt(e.keyCode) : k = parseInt(e.which);
return ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8);
}
function capfirst(t) {
t.value = t.value.slice(0,1).toUpperCase() + t.value.slice(1,t.value.length);
}
// -->
</script>
</head>
<body>
<div>
<form id="example" action="javascript://">
<input type="text" onkeypress="return alpha(event);" onblur="capfirst(this)" />
</form>
</div>
</body>
</html>


Hmm, that's almost elegant... thanks to some of the guys here teaching me this stuff. ;)

P.S. That will not only allow only letters, but will capitalize the first one onblur.

P.P.S. You should have named the post "alpha" characters only, since I originally wrote this to accept numbers, too. ;)
Ricky158
11-24-2002, 04:15 PM
oh whoops, alphanumeric means #'s and letters?? imagine that.... ;)

anyway, i think the onblur thing with the letters only could be called a double "whammy" (pun intended).

thanks, whammy. i'll test the script right now.

EDIT: just tested it, it works perfectly. again, thanks, whammy.
whammy
11-24-2002, 06:20 PM
:cool:
angiras
04-28-2003, 07:46 AM
not bad this script but with

return alpha(event, YourOwnRegex);"

it will be great

it's not praticle to have one sc ript for letters one script for numbers, for mails

do you know the same kind of script with your own expressions ?


thanks