Truncate values from multiline textbox after fix length in javascript or How to truncate a string to a certain number of characters,
Example
Suppose you need to update a textbox with a description. Any description over 10 characters is truncated to 10.
<html>
<head> <script language="JavaScript">
function maxtitle(txt,maxlength)
{
if(txt.value.length > (maxlength-1))
{
txt.value = txt.value.slice(0,maxlength);
return false;
}
}
</script></head>
<body>
<form name=form1>
Enter Name:
<input type="text" name="txtNumber1" onkeyup="return maxtitle(this,10);">
</form>
</body>
</html>