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Is it possible to alter the validation function when using inline_entity_form ?

Here is an example module that I'm using where I use devel to validate if I can hook into drupals and IEF validate functions (as pointed out by Shawn Conn).

function mymodule_inline_entity_form_entity_form_alter(&$entity_form, &$form_state)
{
  $entity_form['#element_validate'] = array('mymodule_inline_entity_form_entity_form_validate');
}


function mymodule_inline_entity_form_entity_form_validate(&$entity_form, &$form_state)
{
  // No effect
  form_set_error('field_price', '!Validate');
  form_set_error('field_bucket_list', '!Validate');
}

I have one content type which has a title and a decimal field called field_price and a second type which has the IEF field (called field_bucket_list).

2 Answers 2

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Yes, IEF calls drupal_alter() after upon building a form. This enables any custom module to invoke hook_inline_entity_form_entity_form_alter() to alter it.

/**
 * Implements hook_inline_entity_form_entity_form_alter().
 */
function MYMODULE_inline_entity_form_entity_form_alter(&$entity_form, &$form_state) {
  // Replace validation callback.
  $entity_form['#element_validate'] = array(
    'MYMODULE_inline_entity_form_entity_form_validate'
  );
}

function MYMODULE_inline_entity_form_entity_form_validate(&$entity_form, &$form_state) {
  // @TODO: Add extra validation in front of IEF validation handler.
  inline_entity_form_entity_form_validate($entity_form, $form_state);
}
2
  • Thank you very much for you answer. It seems that I can hook into the alter function but not into the validate function. I'm using Devel to validate if the hooks work but I get no output when submitting new nodes. I can see that the internal validate functions are run within drupal since it rejects text if I use a decemal field. So I tried to use hook_node_validate but I cant get form_set_error to work there -_- . Any thoughts?
    – Fever
    Commented Aug 19, 2016 at 18:44
  • Saw my mistake, edited my initial post
    – Fever
    Commented Aug 19, 2016 at 22:46
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At last I got it to work. Here is the final code where the error was that I did not fully understand how to use form_set_error to point at the field I wanted to validate.

function mymodule_inline_entity_form_entity_form_alter(&$entity_form, &$form_state)
{
  $entity_form['#element_validate'] = array('mymodule_inline_entity_form_entity_form_validate');
}


function mymodule_inline_entity_form_entity_form_validate(&$entity_form, &$form_state)
{
  form_set_error('field_bucket_list][und][form][field_price', '!Validate');
  inline_entity_form_entity_form_validate($entity_form, $form_state);
}

The field I wanted to validate is field_price and is located as values->field_bucket_list->und->form->field_price in $form_state, which I got from using Devel.

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