--- /dev/null
+/**
+ * @file
+ * Attaches behaviors for Drupal's active link marking.
+ */
+
+(function (Drupal, drupalSettings) {
+
+ 'use strict';
+
+ /**
+ * Append is-active class.
+ *
+ * The link is only active if its path corresponds to the current path, the
+ * language of the linked path is equal to the current language, and if the
+ * query parameters of the link equal those of the current request, since the
+ * same request with different query parameters may yield a different page
+ * (e.g. pagers, exposed View filters).
+ *
+ * Does not discriminate based on element type, so allows you to set the
+ * is-active class on any element: a, li…
+ *
+ * @type {Drupal~behavior}
+ */
+ Drupal.behaviors.activeLinks = {
+ attach: function (context) {
+ // Start by finding all potentially active links.
+ var path = drupalSettings.path;
+ var queryString = JSON.stringify(path.currentQuery);
+ var querySelector = path.currentQuery ? "[data-drupal-link-query='" + queryString + "']" : ':not([data-drupal-link-query])';
+ var originalSelectors = ['[data-drupal-link-system-path="' + path.currentPath + '"]'];
+ var selectors;
+
+ // If this is the front page, we have to check for the <front> path as
+ // well.
+ if (path.isFront) {
+ originalSelectors.push('[data-drupal-link-system-path="<front>"]');
+ }
+
+ // Add language filtering.
+ selectors = [].concat(
+ // Links without any hreflang attributes (most of them).
+ originalSelectors.map(function (selector) { return selector + ':not([hreflang])'; }),
+ // Links with hreflang equals to the current language.
+ originalSelectors.map(function (selector) { return selector + '[hreflang="' + path.currentLanguage + '"]'; })
+ );
+
+ // Add query string selector for pagers, exposed filters.
+ selectors = selectors.map(function (current) { return current + querySelector; });
+
+ // Query the DOM.
+ var activeLinks = context.querySelectorAll(selectors.join(','));
+ var il = activeLinks.length;
+ for (var i = 0; i < il; i++) {
+ activeLinks[i].classList.add('is-active');
+ }
+ },
+ detach: function (context, settings, trigger) {
+ if (trigger === 'unload') {
+ var activeLinks = context.querySelectorAll('[data-drupal-link-system-path].is-active');
+ var il = activeLinks.length;
+ for (var i = 0; i < il; i++) {
+ activeLinks[i].classList.remove('is-active');
+ }
+ }
+ }
+ };
+
+})(Drupal, drupalSettings);