Custom Validation
This section shows you how to add custom validation to your forms, so you can be sure that when they are submitted, the data you receive is as correct as it can be.
Last updated: 09 May 2012, 15:55
Control the length of text entriesYou can add validation to your forms to ensure that users must type text of a length that you control. You can add a maximum length, a minimum length, an exact length, or even an upper and lower boundary.
National Insurance NumberTo add a field that collects someone's National Insurance Number to your form, follow these steps to ensure that the user can only enter a valid NI Number.
Phone numbersTo check that someone is only adding valid characters to the Phone Number field on your form, follow these steps.
Postcode ValidationTo add a field that validates someone's postcode, follow these steps to ensure that the user can only enter the postcode in a valid format.
