I'm trying to save multiple values from multi select option form which I created in the custom widget with:

$element['labs'] = array(
  '#type' => 'select',
  '#options' => $list,
  '#multiple' => 'multiple',
  '#title' => t('Labs'),

The biggest problem is the values won't save! As I know the delta should increment automatically if cardinality is set to more than 1.

1) I can't change cardinality or some other setting after activating the field in the edit field form

2) I can't see my custom field in the field type list to select from if I try to alter existing widgets:

'default_widget' => 'options_select',
'default_formatter' => 'status_field_options',

How could I extend standard list field type to populate the multiselect with my own generated data?


How could I write my widget that Drupal let me save multiple values with different delta?

1 Answer 1


The values won't save when you don't have any storage to write into.

Make sure your widget implements hook_field_schema() and provide necessary schema for a field structure in your .install file. E.g.

 * Implements hook_field_schema().
function MYMODULE_field_schema($field) {
  switch ($field['type']) {
      $columns = array(
        'value' => array(
          'type' => 'text',
          'not null' => FALSE,
  return array(
    'columns' => $columns,
    'indexes' => array(
      'value' => array('value'),

Then in hook_field_info() make sure you've FIELD_BEHAVIOR_DEFAULT for multiple values behavior, e.g.

 * Implements hook_field_widget_info().
function MYMODULE_field_field_widget_info() {
  return array(
    'my_widget' => array(
      'label' => t('Default'),
      'field types' => array('select'),
      'behaviors' => array(
        'multiple values' => FIELD_BEHAVIOR_DEFAULT,

When implementing multiple field properties as part of one widget (such as address field), please check: How to override default cardinality for the field widget?

For complete example, check existing modules under field core module or check field_example module (part of Examples).

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