Prova questo, io lo uso e mi funzia benissimo:
<!-- TWO STEPS TO INSTALL LIMIT TEXTAREA:
1. Copy the coding into the HEAD of your HTML document
2. Add the last code into the BODY of your HTML document -->
codice:
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function textCounter(field, countfield, maxlimit) {
if (field.value.length > maxlimit) // if too long...trim it!
field.value = field.value.substring(0, maxlimit);
// otherwise, update 'characters left' counter
else
countfield.value = maxlimit - field.value.length;
}
// End -->
</script>
</HEAD>
codice:
<BODY>
<center>
<form name=myform action="YOUR-SCRIPT.CGI">
<font size="1" face="arial, helvetica, sans-serif"> ( You may enter up to 125 characters. )
<textarea name=message wrap=physical cols=28 rows=4 onKeyDown="textCounter(this.form.message,this.form.remLen,125);" onKeyUp="textCounter(this.form.message,this.form.remLen,125);"></textarea>
<input readonly type=text name=remLen size=3 maxlength=3 value="125"> characters left</font>
</form>
</center>
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