--- /dev/null
+/**
+ * @file
+ * Attaches behaviors for the Comment module's "X new comments" link.
+ *
+ * May only be loaded for authenticated users, with the History module
+ * installed.
+ */
+
+(function ($, Drupal, drupalSettings) {
+ /**
+ * Render "X new comments" links wherever necessary.
+ *
+ * @type {Drupal~behavior}
+ *
+ * @prop {Drupal~behaviorAttach} attach
+ * Attaches new comment links behavior.
+ */
+ Drupal.behaviors.nodeNewCommentsLink = {
+ attach(context) {
+ // Collect all "X new comments" node link placeholders (and their
+ // corresponding node IDs) newer than 30 days ago that have not already
+ // been read after their last comment timestamp.
+ const nodeIDs = [];
+ const $placeholders = $(context)
+ .find('[data-history-node-last-comment-timestamp]')
+ .once('history')
+ .filter(function () {
+ const $placeholder = $(this);
+ const lastCommentTimestamp = parseInt($placeholder.attr('data-history-node-last-comment-timestamp'), 10);
+ const nodeID = $placeholder.closest('[data-history-node-id]').attr('data-history-node-id');
+ if (Drupal.history.needsServerCheck(nodeID, lastCommentTimestamp)) {
+ nodeIDs.push(nodeID);
+ // Hide this placeholder link until it is certain we'll need it.
+ hide($placeholder);
+ return true;
+ }
+
+ // Remove this placeholder link from the DOM because we won't need
+ // it.
+ remove($placeholder);
+ return false;
+ });
+
+ if ($placeholders.length === 0) {
+ return;
+ }
+
+ // Perform an AJAX request to retrieve node read timestamps.
+ Drupal.history.fetchTimestamps(nodeIDs, () => {
+ processNodeNewCommentLinks($placeholders);
+ });
+ },
+ };
+
+ /**
+ * Hides a "new comment" element.
+ *
+ * @param {jQuery} $placeholder
+ * The placeholder element of the new comment link.
+ *
+ * @return {jQuery}
+ * The placeholder element passed in as a parameter.
+ */
+ function hide($placeholder) {
+ return $placeholder
+ // Find the parent <li>.
+ .closest('.comment-new-comments')
+ // Find the preceding <li>, if any, and give it the 'last' class.
+ .prev().addClass('last')
+ // Go back to the parent <li> and hide it.
+ .end().hide();
+ }
+
+ /**
+ * Removes a "new comment" element.
+ *
+ * @param {jQuery} $placeholder
+ * The placeholder element of the new comment link.
+ */
+ function remove($placeholder) {
+ hide($placeholder).remove();
+ }
+
+ /**
+ * Shows a "new comment" element.
+ *
+ * @param {jQuery} $placeholder
+ * The placeholder element of the new comment link.
+ *
+ * @return {jQuery}
+ * The placeholder element passed in as a parameter.
+ */
+ function show($placeholder) {
+ return $placeholder
+ // Find the parent <li>.
+ .closest('.comment-new-comments')
+ // Find the preceding <li>, if any, and remove its 'last' class, if any.
+ .prev().removeClass('last')
+ // Go back to the parent <li> and show it.
+ .end().show();
+ }
+
+ /**
+ * Processes new comment links and adds appropriate text in relevant cases.
+ *
+ * @param {jQuery} $placeholders
+ * The placeholder elements of the current page.
+ */
+ function processNodeNewCommentLinks($placeholders) {
+ // Figure out which placeholders need the "x new comments" links.
+ const $placeholdersToUpdate = {};
+ let fieldName = 'comment';
+ let $placeholder;
+ $placeholders.each((index, placeholder) => {
+ $placeholder = $(placeholder);
+ const timestamp = parseInt($placeholder.attr('data-history-node-last-comment-timestamp'), 10);
+ fieldName = $placeholder.attr('data-history-node-field-name');
+ const nodeID = $placeholder.closest('[data-history-node-id]').attr('data-history-node-id');
+ const lastViewTimestamp = Drupal.history.getLastRead(nodeID);
+
+ // Queue this placeholder's "X new comments" link to be downloaded from
+ // the server.
+ if (timestamp > lastViewTimestamp) {
+ $placeholdersToUpdate[nodeID] = $placeholder;
+ }
+ // No "X new comments" link necessary; remove it from the DOM.
+ else {
+ remove($placeholder);
+ }
+ });
+
+ // Perform an AJAX request to retrieve node view timestamps.
+ const nodeIDs = Object.keys($placeholdersToUpdate);
+ if (nodeIDs.length === 0) {
+ return;
+ }
+
+ /**
+ * Renders the "X new comments" links.
+ *
+ * Either use the data embedded in the page or perform an AJAX request to
+ * retrieve the same data.
+ *
+ * @param {object} results
+ * Data about new comment links indexed by nodeID.
+ */
+ function render(results) {
+ for (const nodeID in results) {
+ if (results.hasOwnProperty(nodeID) && $placeholdersToUpdate.hasOwnProperty(nodeID)) {
+ $placeholdersToUpdate[nodeID]
+ .attr('href', results[nodeID].first_new_comment_link)
+ .text(Drupal.formatPlural(results[nodeID].new_comment_count, '1 new comment', '@count new comments'))
+ .removeClass('hidden');
+ show($placeholdersToUpdate[nodeID]);
+ }
+ }
+ }
+
+ if (drupalSettings.comment && drupalSettings.comment.newCommentsLinks) {
+ render(drupalSettings.comment.newCommentsLinks.node[fieldName]);
+ }
+ else {
+ $.ajax({
+ url: Drupal.url('comments/render_new_comments_node_links'),
+ type: 'POST',
+ data: { 'node_ids[]': nodeIDs, field_name: fieldName },
+ dataType: 'json',
+ success: render,
+ });
+ }
+ }
+}(jQuery, Drupal, drupalSettings));
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