JavaScript Tutorial/String/length
Get the lengh of a string
<html>
<head>
<script type="text/javascript" language="javascript">
<!-- //
onload = function(){
var myString = "AAA";
document.write(myString + " has a length of " + myString.length + " characters.");
}
// -->
</script>
</head>
<body>
</body>
</html>
string.length
The length property of an instance of the String object returns the total length of the string.
<html>
<script language="JavaScript">
<!--
var myString1 = new String("Hello, World");
var myString2 = new String("Here is a longer string");
var myString3 = new String("Here is an even longer string");
document.write(myString1 + ": is " + myString1.length);
document.write(" characters long.<br>");
document.write(myString2 + ": is " + myString2.length);
document.write(" characters long.<br>");
document.write(myString3 + ": is " + myString3.length);
document.write(" characters long.<br>");
document.close();
-->
</script>
</html>