<script>
function checkStudentNumber(obj)
{
var regex = /^[\d]{6}$/g if ( obj.value.match(regex) )
{
return true;
}
return false;
}
</script>
<form>
<input type=text name=studentNumber>
<input type=button value=check onclick="alert(checkStudentNumber(document.forms[0].studentNumber))"
</form>
function checkStudentNumber(obj)
{
var regex = /^[\d]{6}$/g if ( obj.value.match(regex) )
{
return true;
}
return false;
}
</script>
<form>
<input type=text name=studentNumber>
<input type=button value=check onclick="alert(checkStudentNumber(document.forms[0].studentNumber))"
</form>
{
for (var i=0; i < str.length; i++)
{
var ch = str.substring(i, i+1)
if( ch < "0" || ch>"9" || str.length == null)
{
return false
}
}
return true
}