lenght input

[verN]

how would i in javascript check that the user has entered characters less then for instance 20 if its more then a error is outputted.

<input type=text name=name> could i use onchnage to do this

thnaks

[devinemke]

why don't you simply limit the fields length to 20?

<input type="text" name="fieldname" size="20" maxlength="20">

[bradgrafelman]

While you certainly could do a Javascript approach:

<script type="text/javascript">
function checkLength(obj, len) {
	if(obj.value.length >= len) {
		obj.value = obj.value.substring(0, len);
		alert('fieldname must be ' + len + ' characters or less!');
		return false;
	} else return true;
}
</script>
<input type="text" name="fieldname" onkeypress="return checkLength(this, 20)">

devinemke's suggestion of an HTML approach (or combine both methods?) would probably be better simply because some people may not have Javascript enabled.