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/**
* @file
* Attaches behaviors for the Comment module's "new" indicator.
*
* May only be loaded for authenticated users, with the History module
* installed.
*/
(function ($, Drupal, window) {
'use strict';
/**
* Renders "new" comment indicators wherever necessary.
*
* @type {Drupal~behavior}
*
* @prop {Drupal~behaviorAttach} attach
* Attaches "new" comment indicators behavior.
*/
Drupal.behaviors.commentNewIndicator = {
attach: function (context) {
// Collect all "new" comment indicator placeholders (and their
// corresponding node IDs) newer than 30 days ago that have not already
// been read after their last comment timestamp.
var nodeIDs = [];
var $placeholders = $(context)
.find('[data-comment-timestamp]')
.once('history')
.filter(function () {
var $placeholder = $(this);
var commentTimestamp = parseInt($placeholder.attr('data-comment-timestamp'), 10);
var nodeID = $placeholder.closest('[data-history-node-id]').attr('data-history-node-id');
if (Drupal.history.needsServerCheck(nodeID, commentTimestamp)) {
nodeIDs.push(nodeID);
return true;
}
else {
return false;
}
});
if ($placeholders.length === 0) {
return;
}
// Fetch the node read timestamps from the server.
Drupal.history.fetchTimestamps(nodeIDs, function () {
processCommentNewIndicators($placeholders);
});
}
};
/**
* Processes the markup for "new comment" indicators.
*
* @param {jQuery} $placeholders
* The elements that should be processed.
*/
function processCommentNewIndicators($placeholders) {
var isFirstNewComment = true;
var newCommentString = Drupal.t('new');
var $placeholder;
$placeholders.each(function (index, placeholder) {
$placeholder = $(placeholder);
var timestamp = parseInt($placeholder.attr('data-comment-timestamp'), 10);
var $node = $placeholder.closest('[data-history-node-id]');
var nodeID = $node.attr('data-history-node-id');
var lastViewTimestamp = Drupal.history.getLastRead(nodeID);
if (timestamp > lastViewTimestamp) {
// Turn the placeholder into an actual "new" indicator.
var $comment = $(placeholder)
.removeClass('hidden')
.text(newCommentString)
.closest('.js-comment')
// Add 'new' class to the comment, so it can be styled.
.addClass('new');
// Insert "new" anchor just before the "comment-<cid>" anchor if
// this is the first new comment in the DOM.
if (isFirstNewComment) {
isFirstNewComment = false;
$comment.prev().before('<a id="new" />');
// If the URL points to the first new comment, then scroll to that
// comment.
if (window.location.hash === '#new') {
window.scrollTo(0, $comment.offset().top - Drupal.displace.offsets.top);
}
}
}
});
}
})(jQuery, Drupal, window);