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I need to create a widget for fields of type "taxonomy_term_reference". The widget "taxonomy_select" is very nearly what I need to build, but needs some modification. I have seen examples that start with a given widget to build a custom version. The function below fails because there is no "taxonomy_select_field_widget_form" defined. Where is the "taxonomy_select" form creation code?

/**
 * Implements hook_field_widget_form().
 */
function taxonomy_multiselect_add_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {

  $element += taxonomy_select_field_widget_form($form, $form_state, $field, $instance, $langcode, $items, $delta, $element);

  return $element;
}
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2 Answers

up vote 0 down vote accepted

The taxonomy_term_reference field type uses the core options_select widget and implements hook_options_list() to provide the values, the taxonomy module doesn't implement any of the widget code itself.

The options_select widget is defined in options_field_widget_info() in the code options.module file (inside the field module folder). The form elements themselves are built up in options_field_widget_form() in the same file. They're pretty well commented so you should be able to get a good idea of how they work.

I'd also recommend the Examples module if you haven't already got it, it has a field type/widget example module with good sample code and comments.

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up vote 0 down vote

I'm now trying to customize the core options multiselect with this code:

function taxonomy_multiselect_add_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {

  $instance['widget']['type'] = 'options_select';
  $element += options_field_widget_form($form, $form_state, $field, $instance, $langcode, $items, $delta, $element);

  return $element;
}

But my widget now builds a multiple-value table with the default first row being the multiselect. How can I build my own identical version of the multiselect to begin modifying?

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UPDATE: I now have a good starting point for modifying the options_select widget. I needed to supply a 'behaviors' array to my hook_field_widget_info that sets 'multiple values' => FIELD_BEHAVIOR_CUSTOM – Joe Beuckman Jul 9 '12 at 21:09

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