Hi Angus,
You don't need the number validation if you're using an integer field as the dictionary entry already validates that, so we only need to worry about the length. Here's an onchange script that returns an alert and clears out the value of the field if it's not 4 digits.
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue == '') {
return;
}
if (newValue.toString().length != 4) {
alert("Please enter a 4 digit number");
g_form.setValue('fieldname', '');
}
}
