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Drupal: Validation constraints on form fields ignored
Drupal: Form validation not triggered at first submit, but on second submit
Drupal: Form validate without submit action
Drupal: Invoke a rule upon form validation
21 - Unit 3: Validating Form Submissions: Add a Validation Handler
144. How to use hook_file_validate() to validate an uploaded file (a Drupal how-to)
Drupal: Form validation after drupal_build_form in hook_node_view
Drupal: Custom validation rules for content entity fields
Drupal: String validation not working for custom form
6/22 Form validation based on entity values in Drupal 9 & 10 [ preview ]
Drupal: How do I add the error class when a form validation fails
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Last Updated: August 17, 2026
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![6/22 Form validation based on entity values in Drupal 9 & 10 [ preview ]](https://i.ytimg.com/vi/0kakMMUPGeo/mqdefault.jpg)
![Details 8/22 How to create a custom validation constraint with Drupal 9 & 10 entities [ preview ] Update](https://i.ytimg.com/vi/41pLu3mnY4s/mqdefault.jpg)
