Drupal 8 form alter set default value. I can get the checkbox to appear and I went down about 15 different paths from different answers before discovering this answer. For help clarifying this question so that it can be Or if you wanted a default value supplied to the database when the form is submitted (and no answer was ever given)? If you meant this, then your code could be placed with your forms _validate Set default form values after AJAX callback Ask Question Asked 8 years, 4 months ago Modified 8 years, 4 months ago Viewed 2k times the only other obvious thing to check is to make sure that since you are doing an alter that it is actually being called and the right element is actually being altered. The call order is as follows: all existing form alter functions are called for module A, then all for module B, Hi, I am trying to use hook_form_alter to change my forms default values which was created in views. While I am able to successfully set the default value for the textfield type, not so for the select type. In my validation function, I need to be able to detect whether a field, which was populated with I found this thread after running into a similar problem when trying to use #default_value in form elements when using AJAX callbacks. Modify Existing Elements: Alter existing fields by changing properties such as #title or The first, hook_form_BASE_FORM_ID_alter (), allows targeting of a form/forms via a base form (if one exists). I know that there is possible to use some functions to alter drupal core forms: hook_form_alter(). In this hook, I try to set a default value for a textfield but it doesn't work. If it does, we set the default value for What's the proper way to set the default value? This happens to be a checkboxes field. How to set default form fields value from controller Ask Question Asked 8 years ago Modified 3 years, 9 months ago Altering forms is where the Drupal 8+ Form API reaches into basically the same hook-based approach as Drupal 7.
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