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Drupal example source code file (field.form.inc)

This example Drupal source code file (field.form.inc) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

array, delta, element, field_name, field_state, form_state, function, if, instance, items, langcode, parents, php, title

The field.form.inc Drupal example source code

<?php
// $Id: field.form.inc,v 1.54 2010/11/20 19:57:01 webchick Exp $

/**
 * @file
 * Field forms management.
 */

/**
 * Create a separate form element for each field.
 */
function field_default_form($entity_type, $entity, $field, $instance, $langcode, $items, &$form, &$form_state, $get_delta = NULL) {
  // This could be called with no entity, as when a UI module creates a
  // dummy form to set default values.
  if ($entity) {
    list($id, , ) = entity_extract_ids($entity_type, $entity);
  }

  $parents = $form['#parents'];

  $addition = array();
  $field_name = $field['field_name'];
  $addition[$field_name] = array();

  // Populate widgets with default values when creating a new entity.
  if (empty($items) && empty($id)) {
    $items = field_get_default_value($entity_type, $entity, $field, $instance, $langcode);
  }

  // Let modules alter the widget properties.
  $context = array(
    'entity_type' => $entity_type,
    'entity' => $entity,
    'field' => $field,
    'instance' => $instance,
  );
  drupal_alter(array('field_widget_properties', 'field_widget_properties_' . $entity_type), $instance['widget'], $context);

  // Collect widget elements.
  $elements = array();
  if (field_access('edit', $field, $entity_type, $entity)) {
    // Store field information in $form_state.
    if (!field_form_get_state($parents, $field_name, $langcode, $form_state)) {
      $field_state = array(
        'field' => $field,
        'instance' => $instance,
        'items_count' => count($items),
        'array_parents' => array(),
        'errors' => array(),
      );
      field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);
    }

    // If field module handles multiple values for this form element, and we
    // are displaying an individual element, process the multiple value form.
    if (!isset($get_delta) && field_behaviors_widget('multiple values', $instance) == FIELD_BEHAVIOR_DEFAULT) {
      $elements = field_multiple_value_form($field, $instance, $langcode, $items, $form, $form_state);
    }
    // If the widget is handling multiple values (e.g Options), or if we are
    // displaying an individual element, just get a single form element and
    // make it the $delta value.
    else {
      $delta = isset($get_delta) ? $get_delta : 0;
      $function = $instance['widget']['module'] . '_field_widget_form';
      if (function_exists($function)) {
        $element = array(
          '#entity_type' => $instance['entity_type'],
          '#bundle' => $instance['bundle'],
          '#field_name' => $field_name,
          '#language' => $langcode,
          '#field_parents' => $parents,
          '#columns' => array_keys($field['columns']),
          '#title' => check_plain(t($instance['label'])),
          '#description' => field_filter_xss($instance['description']),
          // Only the first widget should be required.
          '#required' => $delta == 0 && $instance['required'],
          '#delta' => $delta,
        );
        if ($element = $function($form, $form_state, $field, $instance, $langcode, $items, $delta, $element)) {
          // If we're processing a specific delta value for a field where the
          // field module handles multiples, set the delta in the result.
          // For fields that handle their own processing, we can't make
          // assumptions about how the field is structured, just merge in the
          // returned element.
          if (field_behaviors_widget('multiple values', $instance) == FIELD_BEHAVIOR_DEFAULT) {
            $elements[$delta] = $element;
          }
          else {
            $elements = $element;
          }
        }
      }
    }
  }

  if ($elements) {
    // Also aid in theming of field widgets by rendering a classified
    // container.
    $addition[$field_name] = array(
      '#type' => 'container',
      '#attributes' => array(
        'class' => array(
          'field-type-' . drupal_html_class($field['type']),
          'field-name-' . drupal_html_class($field_name),
          'field-widget-' . drupal_html_class($instance['widget']['type']),
        ),
      ),
      '#weight' => $instance['widget']['weight'],
    );
  }

  // Populate the 'array_parents' information in $form_state['field'] after
  // the form is built, so that we catch changes in the form structure performed
  // in alter() hooks.
  $elements['#after_build'][] = 'field_form_element_after_build';
  $elements['#field_name'] = $field_name;
  $elements['#language'] = $langcode;
  $elements['#field_parents'] = $parents;

  $addition[$field_name] += array(
    '#tree' => TRUE,
    // The '#language' key can be used to access the field's form element
    // when $langcode is unknown.
    '#language' => $langcode,
    $langcode => $elements,
  );

  return $addition;
}

/**
 * Special handling to create form elements for multiple values.
 *
 * Handles generic features for multiple fields:
 * - number of widgets
 * - AHAH-'add more' button
 * - drag-n-drop value reordering
 */
function field_multiple_value_form($field, $instance, $langcode, $items, &$form, &$form_state) {
  $field_name = $field['field_name'];
  $parents = $form['#parents'];

  // Determine the number of widgets to display.
  switch ($field['cardinality']) {
    case FIELD_CARDINALITY_UNLIMITED:
      $field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
      $max = $field_state['items_count'];
      break;

    default:
      $max = $field['cardinality'] - 1;
      break;
  }

  $title = check_plain(t($instance['label']));
  $description = field_filter_xss(t($instance['description']));

  $id_prefix = implode('-', array_merge($parents, array($field_name)));
  $wrapper_id = drupal_html_id($id_prefix . '-add-more-wrapper');

  $field_elements = array();

  $function = $instance['widget']['module'] . '_field_widget_form';
  if (function_exists($function)) {
    for ($delta = 0; $delta <= $max; $delta++) {
      $multiple = $field['cardinality'] > 1 || $field['cardinality'] == FIELD_CARDINALITY_UNLIMITED;
      $element = array(
        '#entity_type' => $instance['entity_type'],
        '#bundle' => $instance['bundle'],
        '#field_name' => $field_name,
        '#language' => $langcode,
        '#field_parents' => $parents,
        '#columns' => array_keys($field['columns']),
        // For multiple fields, title and description are handled by the wrapping table.
        '#title' => $multiple ? '' : $title,
        '#description' => $multiple ? '' : $description,
        // Only the first widget should be required.
        '#required' => $delta == 0 && $instance['required'],
        '#delta' => $delta,
        '#weight' => $delta,
      );
      if ($element = $function($form, $form_state, $field, $instance, $langcode, $items, $delta, $element)) {
        // Input field for the delta (drag-n-drop reordering).
        if ($multiple) {
          // We name the element '_weight' to avoid clashing with elements
          // defined by widget.
          $element['_weight'] = array(
            '#type' => 'weight',
            '#title' => t('Weight for row @number', array('@number' => $delta + 1)),
            '#title_display' => 'invisible',
             // Note: this 'delta' is the FAPI 'weight' element's property.
            '#delta' => $max,
            '#default_value' => isset($items[$delta]['_weight']) ? $items[$delta]['_weight'] : $delta,
            '#weight' => 100,
          );
        }
        $field_elements[$delta] = $element;
      }
    }

    if ($field_elements) {
      $field_elements += array(
        '#theme' => 'field_multiple_value_form',
        '#field_name' => $field['field_name'],
        '#cardinality' => $field['cardinality'],
        '#title' => $title,
        '#required' => $instance['required'],
        '#description' => $description,
        '#prefix' => '<div id="' . $wrapper_id . '">',
        '#suffix' => '</div>',
        '#max_delta' => $max,
      );
      // Add 'add more' button, if not working with a programmed form.
      if ($field['cardinality'] == FIELD_CARDINALITY_UNLIMITED && empty($form_state['programmed'])) {
        $field_elements['add_more'] = array(
          '#type' => 'submit',
          '#name' => strtr($id_prefix, '-', '_') . '_add_more',
          '#value' => t('Add another item'),
          '#attributes' => array('class' => array('field-add-more-submit')),
          '#limit_validation_errors' => array(array_merge($parents, array($field_name, $langcode))),
          '#submit' => array('field_add_more_submit'),
          '#ajax' => array(
            'callback' => 'field_add_more_js',
            'wrapper' => $wrapper_id,
            'effect' => 'fade',
          ),
        );
      }
    }
  }

  return $field_elements;
}

/**
 * Returns HTML for an individual form element.
 *
 * Combine multiple values into a table with drag-n-drop reordering.
 * TODO : convert to a template.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element representing the form element.
 *
 * @ingroup themeable
 */
function theme_field_multiple_value_form($variables) {
  $element = $variables['element'];
  $output = '';

  if ($element['#cardinality'] > 1 || $element['#cardinality'] == FIELD_CARDINALITY_UNLIMITED) {
    $table_id = drupal_html_id($element['#field_name'] . '_values');
    $order_class = $element['#field_name'] . '-delta-order';
    $required = !empty($element['#required']) ? '<span class="form-required" title="' . t('This field is required. ') . '">*</span>' : '';

    $header = array(
      array(
        'data' => '<label>' . t('!title: !required', array('!title' => $element['#title'], '!required' => $required)) . "</label>",
        'colspan' => 2,
        'class' => array('field-label'),
      ),
      t('Order'),
    );
    $rows = array();

    // Sort items according to '_weight' (needed when the form comes back after
    // preview or failed validation)
    $items = array();
    foreach (element_children($element) as $key) {
      if ($key === 'add_more') {
        $add_more_button = &$element[$key];
      }
      else {
        $items[] = &$element[$key];
      }
    }
    usort($items, '_field_sort_items_value_helper');

    // Add the items as table rows.
    foreach ($items as $key => $item) {
      $item['_weight']['#attributes']['class'] = array($order_class);
      $delta_element = drupal_render($item['_weight']);
      $cells = array(
        array('data' => '', 'class' => array('field-multiple-drag')),
        drupal_render($item),
        array('data' => $delta_element, 'class' => array('delta-order')),
      );
      $rows[] = array(
        'data' => $cells,
        'class' => array('draggable'),
      );
    }

    $output = '<div class="form-item">';
    $output .= theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => array('id' => $table_id, 'class' => array('field-multiple-table'))));
    $output .= $element['#description'] ? '<div class="description">' . $element['#description'] . '</div>' : '';
    $output .= '<div class="clearfix">' . drupal_render($add_more_button) . '</div>';
    $output .= '</div>';

    drupal_add_tabledrag($table_id, 'order', 'sibling', $order_class);
  }
  else {
    foreach (element_children($element) as $key) {
      $output .= drupal_render($element[$key]);
    }
  }

  return $output;
}

/**
 * #after_build callback for field elements in a form.
 *
 * This stores the final location of the field within the form structure so
 * that field_default_form_errors() can assign validation errors to the right
 * form element.
 *
 * @see field_default_form_errors()
 */
function field_form_element_after_build($element, &$form_state) {
  $parents = $element['#field_parents'];
  $field_name = $element['#field_name'];
  $langcode = $element['#language'];

  $field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
  $field_state['array_parents'] = $element['#array_parents'];
  field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);

  return $element;
}

/**
 * Transfer field-level validation errors to widgets.
 */
function field_default_form_errors($entity_type, $entity, $field, $instance, $langcode, $items, $form, &$form_state) {
  $field_state = field_form_get_state($form['#parents'], $field['field_name'], $langcode, $form_state);

  if (!empty($field_state['errors'])) {
    $function = $instance['widget']['module'] . '_field_widget_error';
    $function_exists = function_exists($function);

    // Locate the correct element in the the form.
    $element = drupal_array_get_nested_value($form_state['complete form'], $field_state['array_parents']);

    $multiple_widget = field_behaviors_widget('multiple values', $instance) != FIELD_BEHAVIOR_DEFAULT;
    foreach ($field_state['errors'] as $delta => $delta_errors) {
      // For multiple single-value widgets, pass errors by delta.
      // For a multiple-value widget, all errors are passed to the main widget.
      $error_element = $multiple_widget ? $element : $element[$delta];
      foreach ($delta_errors as $error) {
        if ($function_exists) {
          $function($error_element, $error, $form, $form_state);
        }
        else {
          // Make sure that errors are reported (even incorrectly flagged) if
          // the widget module fails to implement hook_field_widget_error().
          form_error($error_element, $error['error']);
        }
      }
    }
    // Reinitialize the errors list for the next submit.
    $field_state['errors'] = array();
    field_form_set_state($form['#parents'], $field['field_name'], $langcode, $form_state, $field_state);
  }
}

/**
 * Submit handler for the "Add another item" button of a field form.
 *
 * This handler is run regardless of whether JS is enabled or not. It makes
 * changes to the form state. If the button was clicked with JS disabled, then
 * the page is reloaded with the complete rebuilt form. If the button was
 * clicked with JS enabled, then ajax_form_callback() calls field_add_more_js()
 * to return just the changed part of the form.
 */
function field_add_more_submit($form, &$form_state) {
  $button = $form_state['clicked_button'];

  // Go one level up in the form, to the widgets container.
  $element = drupal_array_get_nested_value($form, array_slice($button['#array_parents'], 0, -1));
  $field_name = $element['#field_name'];
  $langcode = $element['#language'];
  $parents = $element['#field_parents'];

  // Increment the items count.
  $field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
  $field_state['items_count']++;
  field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);

  $form_state['rebuild'] = TRUE;
}

/**
 * Ajax callback in response to a new empty widget being added to the form.
 *
 * This returns the new page content to replace the page content made obsolete
 * by the form submission.
 *
 * @see field_add_more_submit()
 */
function field_add_more_js($form, $form_state) {
  $button = $form_state['clicked_button'];

  // Go one level up in the form, to the widgets container.
  $element = drupal_array_get_nested_value($form, array_slice($button['#array_parents'], 0, -1));
  $field_name = $element['#field_name'];
  $langcode = $element['#language'];
  $parents = $element['#field_parents'];

  $field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);

  $field = $field_state['field'];
  if ($field['cardinality'] != FIELD_CARDINALITY_UNLIMITED) {
    return;
  }

  // Add a DIV around the delta receiving the AJAX effect.
  $delta = $element['#max_delta'];
  $element[$delta]['#prefix'] = '<div class="ajax-new-content">' . (isset($element[$delta]['#prefix']) ? $element[$delta]['#prefix'] : '');
  $element[$delta]['#suffix'] = (isset($element[$delta]['#suffix']) ? $element[$delta]['#suffix'] : '') . '</div>';

  return $element;
}

/**
 * Retrieves processing information about a field from $form_state.
 *
 * @param $parents
 *   The array of #parents where the field lives in the form.
 * @param $field_name
 *   The field name.
 * @param $langcode
 *   The language in which the field values are entered.
 * @param $form_state
 *   The form state.
 *
 * @return
 *   An array with the following key/data pairs:
 *   - field: the field definition array,
 *   - instance: the field instance definition array,
 *   - items_count: the number of widgets to display for the field,
 *   - array_parents: the location of the field's widgets within the $form
 *     structure. This entry is populated at '#after_build' time.
 *   - errors: the array of field validation errors reported on the field. This
 *     entry is populated at field_attach_form_validate() time.
 *
 * @see field_form_set_state()
 */
function field_form_get_state($parents, $field_name, $langcode, &$form_state) {
  $form_state_parents = _field_form_state_parents($parents, $field_name, $langcode);
  return drupal_array_get_nested_value($form_state, $form_state_parents);
}

/**
 * Stores processing information about a field in $form_state.
 *
 * @param $parents
 *   The array of #parents where the field lives in the form.
 * @param $field_name
 *   The field name.
 * @param $langcode
 *   The language in which the field values are entered.
 * @param $form_state
 *   The form state.
 * @param $field_state
 *   The array of data to store. See field_form_get_state() for the structure
 *   and content of the array.
 *
 * @see field_form_get_state()
 */
function field_form_set_state($parents, $field_name, $langcode, &$form_state, $field_state) {
  $form_state_parents = _field_form_state_parents($parents, $field_name, $langcode);
  drupal_array_set_nested_value($form_state, $form_state_parents, $field_state);
}

/**
 * Returns the location of processing information within $form_state.
 */
function _field_form_state_parents($parents, $field_name, $langcode) {
  // To ensure backwards compatibility on regular entity forms for widgets that
  // still access $form_state['field'][$field_name] directly,
  // - top-level fields (empty $parents) are placed directly under
  //   $form_state['fields'][$field_name].
  // - Other fields are placed under
  //   $form_state['field']['#parents'][...$parents...]['#fields'][$field_name]
  //   to avoid clashes between field names and $parents parts.
  // @todo Remove backwards compatibility in Drupal 8, and use a unique
  // $form_state['field'][...$parents...]['#fields'][$field_name] structure.
  if (!empty($parents)) {
    $form_state_parents = array_merge(array('#parents'), $parents, array('#fields'));
  }
  else {
    $form_state_parents = array();
  }
  $form_state_parents = array_merge(array('field'), $form_state_parents, array($field_name, $langcode));

  return $form_state_parents;
}

/**
 * Retrieves the field definition for a widget's helper callbacks.
 *
 * Widgets helper element callbacks (such as #process, #element_validate,
 * #value_callback, ...) should use field_widget_field() and
 * field_widget_instance() instead of field_info_field() and
 * field_info_instance() when they need to access field or instance properties.
 * See hook_field_widget_form() for more details.
 *
 * @param $element
 *   The structured array for the widget.
 * @param $form_state
 *   The form state.
 *
 * @return
 *   The $field definition array for the current widget.
 *
 * @see field_widget_instance()
 * @see hook_field_widget_form()
 */
function field_widget_field($element, $form_state) {
  $field_state = field_form_get_state($element['#field_parents'], $element['#field_name'], $element['#language'], $form_state);
  return $field_state['field'];
}

/**
 * Retrieves the instance definition array for a widget's helper callbacks.
 *
 * Widgets helper element callbacks (such as #process, #element_validate,
 * #value_callback, ...) should use field_widget_field() and
 * field_widget_instance() instead of field_info_field() and
 * field_info_instance() when they need to access field or instance properties.
 * See hook_field_widget_form() for more details.
 *
 * @param $element
 *   The structured array for the widget.
 * @param $form_state
 *   The form state.
 *
 * @return
 *   The $instance definition array for the current widget.
 *
 * @see field_widget_field()
 * @see hook_field_widget_form()
 */
function field_widget_instance($element, $form_state) {
  $field_state = field_form_get_state($element['#field_parents'], $element['#field_name'], $element['#language'], $form_state);
  return $field_state['instance'];
}

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