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On . By CodimTh
Category:

Let's say we have a content type named article, which has a created field by default, and we want to filter by year. To do this, we designed a view that lists all article contents.

I will use this module  to add views filter by year exact, instead of full date like mm-dd-yyyy you can use date year like yyyy.

Then I will add Authored on field to Filter criteria like this:

filter by year in drupal 8

 

Then I change my field to become select field not textfield with this code:

/**
 * Implements hook_form_FORM_ID_alter().
 */
function mytheme_form_views_exposed_form_alter(&$form, FormStateInterface $form_state, $form_id)
{
    if (isset($form['#id']) && $form['#id'] == 'views-exposed-form-news-page-1') {

        $options = &drupal_static(__FUNCTION__);
        if (is_null($options)) {
            $cid = 'node:article:year';
            $data = \Drupal::cache()->get($cid);
            if (!$data) {
                $options = [];
                $options[''] = t('- All -');
                $query = \Drupal::entityQuery('node');
                $query->condition('type', 'article')
                    ->condition('status', 1)
                    ->sort('created', 'ASC');
                $result = $query->execute();
                if ($result) {
                    $nodes = Node::loadMultiple($result);
                    foreach ($nodes as $node) {
                        $date = $node->created->value;
                        $date = date('Y-m-d H:i:s', $date);
                        if ($date) {
                            $date = new DrupalDateTime($date, new DateTimeZone('UTC'));
                            $year = $date->format('Y');
                            if (!isset($options[$year])) {
                                $options[$year] = $year;
                            }
                        }
                    }
                }

                $cache_tags = ['node:article:year'];
                \Drupal::cache()->set($cid, $options, CacheBackendInterface::CACHE_PERMANENT, $cache_tags);
            } else {
                $options = $data->data;
            }

        }
        // change your field type and options here
        $form['year'] = [
            '#type' => 'select',
            '#options' => $options,
        ];
    }
}

Riadh Rahmi

Senior Web Developer (Drupal & Laravel)

I am a senior web developer, I have experience in planning and developing large scale dynamic web applications especially in Drupal, Laravel.

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