64 lines
2.4 KiB
JavaScript
64 lines
2.4 KiB
JavaScript
/**
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* @file
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* Attaches behaviors for Drupal's active link marking.
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*/
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(function (Drupal, drupalSettings) {
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"use strict";
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/**
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* Append active class.
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*
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* The link is only active if its path corresponds to the current path, the
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* language of the linked path is equal to the current language, and if the
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* query parameters of the link equal those of the current request, since the
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* same request with different query parameters may yield a different page
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* (e.g. pagers, exposed View filters).
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*
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* Does not discriminate based on element type, so allows you to set the active
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* class on any element: a, li…
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*/
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Drupal.behaviors.activeLinks = {
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attach: function (context) {
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// Start by finding all potentially active links.
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var path = drupalSettings.path;
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var queryString = JSON.stringify(path.currentQuery);
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var querySelector = path.currentQuery ? "[data-drupal-link-query='" + queryString + "']" : ':not([data-drupal-link-query])';
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var originalSelectors = ['[data-drupal-link-system-path="' + path.currentPath + '"]'];
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var selectors;
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// If this is the front page, we have to check for the <front> path as well.
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if (path.isFront) {
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originalSelectors.push('[data-drupal-link-system-path="<front>"]');
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}
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// Add language filtering.
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selectors = [].concat(
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// Links without any hreflang attributes (most of them).
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originalSelectors.map(function (selector) { return selector + ':not([hreflang])'; }),
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// Links with hreflang equals to the current language.
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originalSelectors.map(function (selector) { return selector + '[hreflang="' + path.currentLanguage + '"]'; })
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);
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// Add query string selector for pagers, exposed filters.
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selectors = selectors.map(function (current) { return current + querySelector; });
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// Query the DOM.
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var activeLinks = context.querySelectorAll(selectors.join(','));
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for (var i = 0, il = activeLinks.length; i < il; i += 1) {
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activeLinks[i].classList.add('active');
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}
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},
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detach: function (context, settings, trigger) {
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if (trigger === 'unload') {
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var activeLinks = context.querySelectorAll('[data-drupal-link-system-path].active');
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for (var i = 0, il = activeLinks.length; i < il; i += 1) {
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activeLinks[i].classList.remove('active');
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}
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}
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}
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};
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})(Drupal, drupalSettings);
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