How to update one select element via Ajax when using node_add

I have just created a new content type called pieza_musical. What I just want to do is update one select element via Ajax depending on another select choice, a dependant select.

I’m altering the form_node_add using hook_form_alter to inject the #ajax element and replace in the wrapper the previous select rendered by default in the content type.

Everything is working except when it comes to save. I think, due I’m replacing the select via $ajax[‘method’] = replace, maybe some token is missing and the content type can’t be saved.

It show these error messages:

An illegal choice has been detected. Please contact the site administrator.
Género: illegal value.

This is my simple code:

function seven_form_pieza_musical_node_form_alter(&$form, &$form_state, $form_id) {   $generos = taxonomy_get_tree(2,0,1);   $values_generos = array();   foreach ($generos as $genero) {     $values_generos[$genero->tid] = $genero->name;   }    $form['field_genero']['und']['#options'] = $values_generos;   // adds ajax    $form['field_genero']['und']['#ajax'] =  array(      'event' => 'change',      'wrapper' => 'edit-field-subgenero-und',      'callback' => 'subgenero_ajax_callback',   ); }  function subgenero_ajax_callback($form, &$form_state) {   $generoId = $form_state['values']['field_genero']['und'][0]['value'];    $cat = taxonomy_term_load($generoId);   $vid = $cat->vid;    $generos = taxonomy_get_tree($vid,$generoId,1);    $options = array();   foreach ($generos as $genero) {     $options[$genero->tid] = $genero->name;   }   $form['field_subgenero_ajax'] = array(     '#type' => 'select',     '#id' => 'edit-field-subgenero-und',     '#required' => TRUE,     '#name' => 'field_subgenero[und]',     '#options' => $options,   );   return $form['field_subgenero_ajax']; } 
  • Is it possible to make this is a content type?
  • Should I create a new entity just for this little purpose?
  • Should I create a custom field?
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How to update one select element via Ajax when using node_add

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