Question

i’m trying to validate a credit card security number, i’ve set the max length to 3 but i need to make sure that the users enters at least 3 and i cant find any minlength ways to do it.

Security: <input type="text" name="secno" maxlength="3">

var n=document.forms["myForm"]["secno"].value;
if (n==null || n=="" || isNaN(n)) {
  alert("Security number needed");
  return false;
}

Answer 1

This will do:

<input type="text" name="secno" onblur="if(this.value.length < 3 )alert('At least three chars.');" maxlength="3">