JavaScript Forum

**Dark-Skys99** · 03-29-2005, 08:33 AM

How would i go about checking the length of the input the user has put into a text field...

What I want to be able to do is check if what they have entered is between 3 and 20 characters long.. then if its less than 3 or more than 20 use an alert to tell them they must enter a username between 3 and 20 characters.

Thanks

**pitbull82** · 03-29-2005, 09:22 AM

Here's your code:

Code:

<html>
<head>
<script type="text/javascript">
function check(what)
{
	var length=what.nickname.value.length;	

	if (length >2 && length < 21)
		what.submit();
	else
		alert("Your nick should be 3-20 characters long.");
}
</script>
</head>
<body>
<form action="sendMessage.php" method="post">
<div>
<input type="text" value="" name="nickname"  />
<input type="submit" value="Submit" onclick="check(this.form); return false;" />
</div>
</form>
</body>
</html>

**Dark-Skys99** · 03-29-2005, 09:28 AM

Thanks