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Custom form validation

I’ve created a custom module for populating a database and now I need to apply form validation to this form.

I want a few different validation things to happen.

  1. I want to limit specific entries on the client side IE: only allowing 6 characters being entered etc.
  2. On submit I want to run through validation rules to make sure what was entered is correct. IE: only positive #s etc.

Are there any drupal 7 FAPI fields to validate specifics like this?

I found something like '#element_validate' => array('element_validate_integer_positive'),

Is there a list anywhere of element validations like this? I’m unable to find documentation anywhere 🙁

This article was republished from its original source.
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