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- <?php
- /**
- * @file views_dependent_filters.module
- * Provides a Views exposed filter which makes other filters depend on values
- * in yet further filters for their visiblity and processing.
- * For example: if the 'node type' filter is set to 'article', show a filter for
- * a field that is only present on articles.
- */
- /**
- * Implements hook_views_api().
- */
- function views_dependent_filters_views_api() {
- return array(
- 'api' => '3.0-alpha1',
- 'path' => drupal_get_path('module', 'views_dependent_filters'),
- );
- }
- /**
- * After build form processor for the views exposed form.
- *
- * This is added by the exposed filter handler so that we can add a CTools
- * visiblity dependency.
- * We don't use Drupal core #states because as far as I can tell they don't
- * work here.
- * See also merlinofchaos's comment here: http://drupal.org/node/1406470
- */
- function views_dependent_filters_exposed_form_after_build($form, $form_state) {
- // We may have multiple dependency info arrays from more than one copies
- // of the views_dependent_filters_handler_filter_dependent handler.
- foreach ($form_state['dependent_exposed_filters'] as $dependency_info) {
- // Build up the CTools #dependency item to put onto each dependent element.
- $form_dependency = array();
- foreach ($dependency_info['controllers'] as $filter_id => $controller_values) {
- $identifier = $dependency_info['identifiers'][$filter_id];
- // Regular form.
- $filter_html_id = views_dependent_filters_recreate_html_id($identifier);
- $form_dependency['edit-' . $filter_html_id] = $controller_values;
- // better_exposed_filters form.
- foreach ($controller_values as $value) {
- $value = views_dependent_filters_recreate_html_id($value);
- $key = 'edit-' . $filter_html_id . '-' . $value;
- $form_dependency[$key] = array(TRUE);
- }
- }
- // Set the dependency on each form element as required.
- foreach ($dependency_info['dependents'] as $dependent_filter_id) {
- $identifier = $dependency_info['identifiers'][$dependent_filter_id];
- $form[$identifier]['#process'][] = 'ctools_dependent_process';
- if (!isset($form[$identifier]['#dependency'])) {
- $form[$identifier]['#dependency'] = array();
- }
- $form[$identifier]['#dependency'] += $form_dependency;
- }
- }
- return $form;
- }
- /**
- * Convert a string to an HTML id matching one made with drupal_html_id().
- *
- * We can't simply call drupal_html_id() because that only returns unique
- * ids; this is intended for when the ID already exists and we want to recreate
- * it from the original input.
- */
- function views_dependent_filters_recreate_html_id($id) {
- $id = strtr(drupal_strtolower($id), array(' ' => '-', '_' => '-', '[' => '-', ']' => ''));
- // As defined in http://www.w3.org/TR/html4/types.html#type-name, HTML IDs can
- // only contain letters, digits ([0-9]), hyphens ("-"), underscores ("_"),
- // colons (":"), and periods ("."). We strip out any character not in that
- // list. Note that the CSS spec doesn't allow colons or periods in identifiers
- // (http://www.w3.org/TR/CSS21/syndata.html#characters), so we strip those two
- // characters as well.
- $id = preg_replace('/[^A-Za-z0-9\-_]/', '', $id);
- // Removing multiple consecutive hyphens.
- $id = preg_replace('/\-+/', '-', $id);
- return $id;
- }
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