605 lines
22 KiB
PHP
605 lines
22 KiB
PHP
<?php
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/**
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* @file
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* Field forms management.
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*/
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/**
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* Creates a form element for a field and can populate it with a default value.
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*
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* If the form element is not associated with an entity (i.e., $entity is NULL)
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* field_get_default_value will be called to supply the default value for the
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* field. Also allows other modules to alter the form element by implementing
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* their own hooks.
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*
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* @param $entity_type
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* The type of entity (for example 'node' or 'user') that the field belongs
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* to.
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* @param $entity
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* The entity object that the field belongs to. This may be NULL if creating a
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* form element with a default value.
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* @param $field
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* An array representing the field whose editing element is being created.
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* @param $instance
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* An array representing the structure for $field in its current context.
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* @param $langcode
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* The language associated with the field.
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* @param $items
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* An array of the field values. When creating a new entity this may be NULL
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* or an empty array to use default values.
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* @param $form
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* An array representing the form that the editing element will be attached
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* to.
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* @param $form_state
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* An array containing the current state of the form.
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* @param $get_delta
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* Used to get only a specific delta value of a multiple value field.
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*
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* @return
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* The form element array created for this field.
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*/
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function field_default_form($entity_type, $entity, $field, $instance, $langcode, $items, &$form, &$form_state, $get_delta = NULL) {
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// This could be called with no entity, as when a UI module creates a
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// dummy form to set default values.
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if ($entity) {
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list($id, , ) = entity_extract_ids($entity_type, $entity);
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}
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$parents = $form['#parents'];
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$addition = array();
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$field_name = $field['field_name'];
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$addition[$field_name] = array();
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// Populate widgets with default values when creating a new entity.
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if (empty($items) && empty($id)) {
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$items = field_get_default_value($entity_type, $entity, $field, $instance, $langcode);
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}
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// Let modules alter the widget properties.
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$context = array(
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'entity_type' => $entity_type,
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'entity' => $entity,
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'field' => $field,
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'instance' => $instance,
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);
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drupal_alter(array('field_widget_properties', 'field_widget_properties_' . $entity_type), $instance['widget'], $context);
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// Collect widget elements.
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$elements = array();
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// Store field information in $form_state.
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if (!field_form_get_state($parents, $field_name, $langcode, $form_state)) {
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$field_state = array(
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'field' => $field,
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'instance' => $instance,
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'items_count' => count($items),
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'array_parents' => array(),
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'errors' => array(),
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);
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field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);
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}
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// If field module handles multiple values for this form element, and we are
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// displaying an individual element, process the multiple value form.
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if (!isset($get_delta) && field_behaviors_widget('multiple values', $instance) == FIELD_BEHAVIOR_DEFAULT) {
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// Store the entity in the form.
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$form['#entity'] = $entity;
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$elements = field_multiple_value_form($field, $instance, $langcode, $items, $form, $form_state);
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}
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// If the widget is handling multiple values (e.g Options), or if we are
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// displaying an individual element, just get a single form element and make
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// it the $delta value.
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else {
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$delta = isset($get_delta) ? $get_delta : 0;
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$function = $instance['widget']['module'] . '_field_widget_form';
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if (function_exists($function)) {
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$element = array(
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'#entity' => $entity,
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'#entity_type' => $instance['entity_type'],
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'#bundle' => $instance['bundle'],
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'#field_name' => $field_name,
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'#language' => $langcode,
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'#field_parents' => $parents,
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'#columns' => array_keys($field['columns']),
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'#title' => check_plain($instance['label']),
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'#description' => field_filter_xss($instance['description']),
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// Only the first widget should be required.
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'#required' => $delta == 0 && $instance['required'],
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'#delta' => $delta,
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);
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if ($element = $function($form, $form_state, $field, $instance, $langcode, $items, $delta, $element)) {
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// Allow modules to alter the field widget form element.
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$context = array(
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'form' => $form,
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'field' => $field,
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'instance' => $instance,
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'langcode' => $langcode,
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'items' => $items,
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'delta' => $delta,
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);
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drupal_alter(array('field_widget_form', 'field_widget_' . $instance['widget']['type'] . '_form'), $element, $form_state, $context);
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// If we're processing a specific delta value for a field where the
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// field module handles multiples, set the delta in the result.
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// For fields that handle their own processing, we can't make
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// assumptions about how the field is structured, just merge in the
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// returned element.
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if (field_behaviors_widget('multiple values', $instance) == FIELD_BEHAVIOR_DEFAULT) {
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$elements[$delta] = $element;
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}
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else {
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$elements = $element;
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}
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}
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}
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}
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// Also aid in theming of field widgets by rendering a classified container.
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$addition[$field_name] = array(
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'#type' => 'container',
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'#attributes' => array(
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'class' => array(
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'field-type-' . drupal_html_class($field['type']),
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'field-name-' . drupal_html_class($field_name),
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'field-widget-' . drupal_html_class($instance['widget']['type']),
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),
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),
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'#weight' => $instance['widget']['weight'],
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);
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// Populate the 'array_parents' information in $form_state['field'] after
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// the form is built, so that we catch changes in the form structure performed
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// in alter() hooks.
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$elements['#after_build'][] = 'field_form_element_after_build';
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$elements['#field_name'] = $field_name;
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$elements['#language'] = $langcode;
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$elements['#field_parents'] = $parents;
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$addition[$field_name] += array(
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'#tree' => TRUE,
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// The '#language' key can be used to access the field's form element
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// when $langcode is unknown.
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'#language' => $langcode,
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$langcode => $elements,
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'#access' => field_access('edit', $field, $entity_type, $entity),
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);
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return $addition;
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}
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/**
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* Special handling to create form elements for multiple values.
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*
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* Handles generic features for multiple fields:
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* - number of widgets
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* - AHAH-'add more' button
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* - drag-n-drop value reordering
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*/
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function field_multiple_value_form($field, $instance, $langcode, $items, &$form, &$form_state) {
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$field_name = $field['field_name'];
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$parents = $form['#parents'];
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// Determine the number of widgets to display.
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switch ($field['cardinality']) {
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case FIELD_CARDINALITY_UNLIMITED:
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$field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
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$max = $field_state['items_count'];
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break;
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default:
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$max = $field['cardinality'] - 1;
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break;
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}
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$title = check_plain($instance['label']);
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$description = field_filter_xss($instance['description']);
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$id_prefix = implode('-', array_merge($parents, array($field_name)));
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$wrapper_id = drupal_html_id($id_prefix . '-add-more-wrapper');
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$field_elements = array();
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$function = $instance['widget']['module'] . '_field_widget_form';
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if (function_exists($function)) {
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for ($delta = 0; $delta <= $max; $delta++) {
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$multiple = $field['cardinality'] > 1 || $field['cardinality'] == FIELD_CARDINALITY_UNLIMITED;
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$element = array(
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'#entity_type' => $instance['entity_type'],
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'#entity' => $form['#entity'],
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'#bundle' => $instance['bundle'],
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'#field_name' => $field_name,
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'#language' => $langcode,
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'#field_parents' => $parents,
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'#columns' => array_keys($field['columns']),
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// For multiple fields, title and description are handled by the wrapping table.
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'#title' => $multiple ? '' : $title,
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'#description' => $multiple ? '' : $description,
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// Only the first widget should be required.
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'#required' => $delta == 0 && $instance['required'],
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'#delta' => $delta,
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'#weight' => $delta,
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);
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if ($element = $function($form, $form_state, $field, $instance, $langcode, $items, $delta, $element)) {
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// Input field for the delta (drag-n-drop reordering).
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if ($multiple) {
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// We name the element '_weight' to avoid clashing with elements
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// defined by widget.
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$element['_weight'] = array(
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'#type' => 'weight',
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'#title' => t('Weight for row @number', array('@number' => $delta + 1)),
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'#title_display' => 'invisible',
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// Note: this 'delta' is the FAPI 'weight' element's property.
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'#delta' => $max,
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'#default_value' => isset($items[$delta]['_weight']) ? $items[$delta]['_weight'] : $delta,
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'#weight' => 100,
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);
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}
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// Allow modules to alter the field widget form element.
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$context = array(
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'form' => $form,
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'field' => $field,
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'instance' => $instance,
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'langcode' => $langcode,
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'items' => $items,
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'delta' => $delta,
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);
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drupal_alter(array('field_widget_form', 'field_widget_' . $instance['widget']['type'] . '_form'), $element, $form_state, $context);
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$field_elements[$delta] = $element;
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}
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}
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if ($field_elements) {
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$field_elements += array(
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'#theme' => 'field_multiple_value_form',
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'#field_name' => $field['field_name'],
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'#cardinality' => $field['cardinality'],
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'#title' => $title,
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'#required' => $instance['required'],
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'#description' => $description,
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'#prefix' => '<div id="' . $wrapper_id . '">',
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'#suffix' => '</div>',
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'#max_delta' => $max,
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);
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// Add 'add more' button, if not working with a programmed form.
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if ($field['cardinality'] == FIELD_CARDINALITY_UNLIMITED && empty($form_state['programmed'])) {
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$field_elements['add_more'] = array(
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'#type' => 'submit',
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'#name' => strtr($id_prefix, '-', '_') . '_add_more',
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'#value' => t('Add another item'),
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'#attributes' => array('class' => array('field-add-more-submit')),
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'#limit_validation_errors' => array(array_merge($parents, array($field_name, $langcode))),
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'#submit' => array('field_add_more_submit'),
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'#ajax' => array(
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'callback' => 'field_add_more_js',
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'wrapper' => $wrapper_id,
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'effect' => 'fade',
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),
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);
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}
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}
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}
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return $field_elements;
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}
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/**
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* Returns HTML for an individual form element.
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*
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* Combine multiple values into a table with drag-n-drop reordering.
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* TODO : convert to a template.
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*
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* @param $variables
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* An associative array containing:
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* - element: A render element representing the form element.
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*
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* @ingroup themeable
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*/
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function theme_field_multiple_value_form($variables) {
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$element = $variables['element'];
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$output = '';
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if ($element['#cardinality'] > 1 || $element['#cardinality'] == FIELD_CARDINALITY_UNLIMITED) {
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$table_id = drupal_html_id($element['#field_name'] . '_values');
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$order_class = $element['#field_name'] . '-delta-order';
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$required = !empty($element['#required']) ? theme('form_required_marker', $variables) : '';
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$header = array(
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array(
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'data' => '<label>' . t('!title !required', array('!title' => $element['#title'], '!required' => $required)) . "</label>",
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'colspan' => 2,
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'class' => array('field-label'),
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),
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t('Order'),
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);
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$rows = array();
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// Sort items according to '_weight' (needed when the form comes back after
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// preview or failed validation)
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$items = array();
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foreach (element_children($element) as $key) {
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if ($key === 'add_more') {
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$add_more_button = &$element[$key];
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}
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else {
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$items[] = &$element[$key];
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}
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}
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usort($items, '_field_sort_items_value_helper');
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// Add the items as table rows.
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foreach ($items as $key => $item) {
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$item['_weight']['#attributes']['class'] = array($order_class);
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$delta_element = drupal_render($item['_weight']);
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$cells = array(
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array('data' => '', 'class' => array('field-multiple-drag')),
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drupal_render($item),
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array('data' => $delta_element, 'class' => array('delta-order')),
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);
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$rows[] = array(
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'data' => $cells,
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'class' => array('draggable'),
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);
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}
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$output = '<div class="form-item">';
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$output .= theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => array('id' => $table_id, 'class' => array('field-multiple-table'))));
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$output .= $element['#description'] ? '<div class="description">' . $element['#description'] . '</div>' : '';
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$output .= '<div class="clearfix">' . drupal_render($add_more_button) . '</div>';
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$output .= '</div>';
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drupal_add_tabledrag($table_id, 'order', 'sibling', $order_class);
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}
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else {
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foreach (element_children($element) as $key) {
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$output .= drupal_render($element[$key]);
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}
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}
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return $output;
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}
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/**
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* #after_build callback for field elements in a form.
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*
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* This stores the final location of the field within the form structure so
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* that field_default_form_errors() can assign validation errors to the right
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* form element.
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*
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* @see field_default_form_errors()
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*/
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function field_form_element_after_build($element, &$form_state) {
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$parents = $element['#field_parents'];
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$field_name = $element['#field_name'];
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$langcode = $element['#language'];
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$field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
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$field_state['array_parents'] = $element['#array_parents'];
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field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);
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return $element;
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}
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/**
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* Transfer field-level validation errors to widgets.
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*/
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function field_default_form_errors($entity_type, $entity, $field, $instance, $langcode, $items, $form, &$form_state) {
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$field_state = field_form_get_state($form['#parents'], $field['field_name'], $langcode, $form_state);
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if (!empty($field_state['errors'])) {
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// Locate the correct element in the form.
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$element = drupal_array_get_nested_value($form_state['complete form'], $field_state['array_parents']);
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// Only set errors if the element is accessible.
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if (!isset($element['#access']) || $element['#access']) {
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$function = $instance['widget']['module'] . '_field_widget_error';
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$function_exists = function_exists($function);
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$multiple_widget = field_behaviors_widget('multiple values', $instance) != FIELD_BEHAVIOR_DEFAULT;
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foreach ($field_state['errors'] as $delta => $delta_errors) {
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// For multiple single-value widgets, pass errors by delta.
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// For a multiple-value widget, pass all errors to the main widget.
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$error_element = $multiple_widget ? $element : $element[$delta];
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foreach ($delta_errors as $error) {
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if ($function_exists) {
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$function($error_element, $error, $form, $form_state);
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}
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else {
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// Make sure that errors are reported (even incorrectly flagged) if
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// the widget module fails to implement hook_field_widget_error().
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form_error($error_element, $error['message']);
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}
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}
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}
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// Reinitialize the errors list for the next submit.
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$field_state['errors'] = array();
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field_form_set_state($form['#parents'], $field['field_name'], $langcode, $form_state, $field_state);
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}
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}
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}
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/**
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* Submit handler for the "Add another item" button of a field form.
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*
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* This handler is run regardless of whether JS is enabled or not. It makes
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* changes to the form state. If the button was clicked with JS disabled, then
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* the page is reloaded with the complete rebuilt form. If the button was
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* clicked with JS enabled, then ajax_form_callback() calls field_add_more_js()
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* to return just the changed part of the form.
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*/
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function field_add_more_submit($form, &$form_state) {
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$button = $form_state['triggering_element'];
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// Go one level up in the form, to the widgets container.
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$element = drupal_array_get_nested_value($form, array_slice($button['#array_parents'], 0, -1));
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$field_name = $element['#field_name'];
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$langcode = $element['#language'];
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$parents = $element['#field_parents'];
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// Increment the items count.
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$field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
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$field_state['items_count']++;
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field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);
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$form_state['rebuild'] = TRUE;
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}
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/**
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* Ajax callback in response to a new empty widget being added to the form.
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*
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* This returns the new page content to replace the page content made obsolete
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* by the form submission.
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*
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* @see field_add_more_submit()
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*/
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function field_add_more_js($form, $form_state) {
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$button = $form_state['triggering_element'];
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// Go one level up in the form, to the widgets container.
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$element = drupal_array_get_nested_value($form, array_slice($button['#array_parents'], 0, -1));
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$field_name = $element['#field_name'];
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$langcode = $element['#language'];
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$parents = $element['#field_parents'];
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$field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
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|
|
|
$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'];
|
|
}
|