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A similar question has been asked before: How do you identify a form element?

I am using the Devel module and dpm($form) outputs the object nicely:

screen

But I can't set/change the default value of a custom field. How do I target set the default value to 164 in this case?

$form['question_node_form']['field_points']['und']['0']['value']['#default_value'] = 164;

The above does not work and the points_field is blank.

EDIT (complete function):

function custom2_form_question_node_form_alter(&$form, &$form_state, &$form_id) {
    drupal_set_message("Form ID is : " . $form_id);
    dpm($form);
    $form['question_node_form']['field_points']['und']['0']['value']['#default_value'] = 164;
}
  • Your code looks OK. Are you sure you are declaring the form_alter function to take the $form array by reference? (hook_form_alter(&$form) ?) – AyeshK Nov 9 '15 at 9:52
  • Hey Ayesh! Thx for your suggestion. Ive added the full function. – user24957 Nov 9 '15 at 10:08
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You're calling the explicit hook_form_FORM_ID_alter for a start so $form_id will never be anything except question_node_form.

However the problem is you are trying to target a child of the form array. The top level array is already question_node_form. Your code should look like this:

function custom2_form_question_node_form_alter(&$form, &$form_state, $form_id) {
    $form['field_points']['und']['0']['value']['#default_value'] = 164;
}

Debugging removed for clarity. Noticed we removed ['question_node_form'].

Also note you can't pass $form_id by reference (not that it matters) as it can't be changed.

https://api.drupal.org/api/drupal/modules%21system%21system.api.php/function/hook_form_FORM_ID_alter/7

  • Nitpick: you can pass $form_id by reference, it can be changed, it's just that the calling function doesn't do anything with the changes so it's a bit pointless doing so – Clive Nov 9 '15 at 10:59
  • Thanks Clive. Really? You can change it? Sounds scary! – Queenvictoria Nov 9 '15 at 19:44

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