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<title>[42360] trunk/src/wp-includes: Comments: Modernise JavaScript for comment reply links.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/42360">42360</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/42360","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>peterwilsoncc</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-12-03 22:36:15 +0000 (Sun, 03 Dec 2017)</dd>
</dl>
<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Comments: Modernise JavaScript for comment reply links.
Update the comment reply JavaScript to be unobtrusive and use events rather than inline `onclick` attributes.
Along with bringing the code into the 2010s this prevents an edge-case in which `addComment.moveForm()` could be called before the JavaScript has loaded.
Props peterwilsoncc, bradparbs.
Fixes <a href="https://core.trac.wordpress.org/ticket/31590">#31590</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludescommenttemplatephp">trunk/src/wp-includes/comment-template.php</a></li>
<li><a href="#trunksrcwpincludesjscommentreplyjs">trunk/src/wp-includes/js/comment-reply.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludescommenttemplatephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/comment-template.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/comment-template.php 2017-12-03 22:28:33 UTC (rev 42359)
+++ trunk/src/wp-includes/comment-template.php 2017-12-03 22:36:15 UTC (rev 42360)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1667,15 +1667,25 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $args['login_text']
</span><span class="cx" style="display: block; padding: 0 10px"> );
</span><span class="cx" style="display: block; padding: 0 10px"> } else {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $onclick = sprintf(
- 'return addComment.moveForm( "%1$s-%2$s", "%2$s", "%3$s", "%4$s" )',
- $args['add_below'], $comment->comment_ID, $args['respond_id'], $post->ID
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $data_attributes = array(
+ 'commentid' => $comment->comment_ID,
+ 'postid' => $post->ID,
+ 'belowelement' => $args['add_below'] . '-' . $comment->comment_ID,
+ 'respondelement' => $args['respond_id'],
</ins><span class="cx" style="display: block; padding: 0 10px"> );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $data_attribute_string = '';
+
+ foreach ( $data_attributes as $name => $value ) {
+ $data_attribute_string .= " data-${name}=\"" . esc_attr( $value ) . "\"";
+ }
+
+ $data_attribute_string = trim( $data_attribute_string );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> $link = sprintf(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "<a rel='nofollow' class='comment-reply-link' href='%s' onclick='%s' aria-label='%s'>%s</a>",
- esc_url( add_query_arg( 'replytocom', $comment->comment_ID, get_permalink( $post->ID ) ) ) . '#' . $args['respond_id'],
- $onclick,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "<a rel='nofollow' class='comment-reply-link' href='%s' %s aria-label='%s'>%s</a>",
+ esc_url( add_query_arg( 'replytocom', $comment->comment_ID ) ) . "#" . $args['respond_id'],
+ $data_attribute_string,
</ins><span class="cx" style="display: block; padding: 0 10px"> esc_attr( sprintf( $args['reply_to_text'], $comment->comment_author ) ),
</span><span class="cx" style="display: block; padding: 0 10px"> $args['reply_text']
</span><span class="cx" style="display: block; padding: 0 10px"> );
</span></span></pre></div>
<a id="trunksrcwpincludesjscommentreplyjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/js/comment-reply.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/js/comment-reply.js 2017-12-03 22:28:33 UTC (rev 42359)
+++ trunk/src/wp-includes/js/comment-reply.js 2017-12-03 22:36:15 UTC (rev 42360)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -5,86 +5,252 @@
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @type {Object}
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-var addComment = {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+var addComment;
+addComment = ( function( window ) {
+ // Avoid scope lookups on commonly used variables.
+ var document = window.document;
+
+ // Settings.
+ var config = {
+ commentReplyClass : 'comment-reply-link',
+ cancelReplyId : 'cancel-comment-reply-link',
+ commentFormId : 'commentform',
+ temporaryFormId : 'wp-temp-form-div',
+ parentIdFieldId : 'comment_parent',
+ postIdFieldId : 'comment_post_ID'
+ };
+
+ // Check browser cuts the mustard.
+ var cutsTheMustard = 'querySelector' in document && 'addEventListener' in window;
+
+ /*
+ * Check browser supports dataset.
+ * !! sets the variable to true if the property exists.
+ */
+ var supportsDataset = !! document.body.dataset;
+
+ // For holding the cancel element.
+ var cancelElement;
+
+ // For holding the comment form element.
+ var commentFormElement;
+
+ // The respond element.
+ var respondElement;
+
+ // Initialise the events.
+ init();
+
</ins><span class="cx" style="display: block; padding: 0 10px"> /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @summary Retrieves the elements corresponding to the given IDs.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Add events to links classed .comment-reply-link.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @since 2.7.0
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Searches the context for reply links and adds the JavaScript events
+ * required to move the comment form. To allow for lazy loading of
+ * comments this method is exposed as window.commentReply.init().
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @param {string} commId The comment ID.
- * @param {string} parentId The parent ID.
- * @param {string} respondId The respond ID.
- * @param {string} postId The post ID.
- * @returns {boolean} Always returns false.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @since 5.0.0
+ *
+ * @param {HTMLElement} context The parent DOM element to search for links.
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- moveForm: function( commId, parentId, respondId, postId ) {
- var div, element, style, cssHidden,
- t = this,
- comm = t.I( commId ),
- respond = t.I( respondId ),
- cancel = t.I( 'cancel-comment-reply-link' ),
- parent = t.I( 'comment_parent' ),
- post = t.I( 'comment_post_ID' ),
- commentForm = respond.getElementsByTagName( 'form' )[0];
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ function init( context ) {
+ if ( true !== cutsTheMustard ) {
+ return;
+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( ! comm || ! respond || ! cancel || ! parent || ! commentForm ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Get required elements.
+ cancelElement = getElementById( config.cancelReplyId );
+ commentFormElement = getElementById( config.commentFormId );
+
+ // No cancel element, no replies.
+ if ( ! cancelElement ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> return;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- t.respondId = respondId;
- postId = postId || false;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ cancelElement.addEventListener( 'touchstart', cancelEvent );
+ cancelElement.addEventListener( 'click', cancelEvent );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( ! t.I( 'wp-temp-form-div' ) ) {
- div = document.createElement( 'div' );
- div.id = 'wp-temp-form-div';
- div.style.display = 'none';
- respond.parentNode.insertBefore( div, respond );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ var links = replyLinks( context );
+ var element;
+
+ for ( var i = 0, l = links.length; i < l; i++ ) {
+ element = links[i];
+
+ element.addEventListener( 'touchstart', clickEvent );
+ element.addEventListener( 'click', clickEvent );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- comm.parentNode.insertBefore( respond, comm.nextSibling );
- if ( post && postId ) {
- post.value = postId;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * Return all links classed .comment-reply-link.
+ *
+ * @since 5.0.0
+ *
+ * @param {HTMLElement} context The parent DOM element to search for links.
+ *
+ * @return {HTMLCollection|NodeList|Array}
+ */
+ function replyLinks( context ) {
+ var selectorClass = config.commentReplyClass;
+ var allReplyLinks;
+
+ // childNodes is a handy check to ensure the context is a HTMLElement.
+ if ( ! context || ! context.childNodes ) {
+ context = document;
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- parent.value = parentId;
- cancel.style.display = '';
</del><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- /**
- * @summary Puts back the comment, hides the cancel button and removes the onclick event.
- *
- * @returns {boolean} Always returns false.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( document.getElementsByClassName ) {
+ // Fastest.
+ allReplyLinks = context.getElementsByClassName( selectorClass );
+ }
+ else {
+ // Fast.
+ allReplyLinks = context.querySelectorAll( '.' + selectorClass );
+ }
+
+ return allReplyLinks;
+ }
+
+ /**
+ * Cancel event handler.
+ *
+ * @since 5.0.0
+ *
+ * @param {Event} event The calling event.
+ */
+ function cancelEvent( event ) {
+ var cancelLink = this;
+ var temporaryFormId = config.temporaryFormId;
+ var temporaryElement = getElementById( temporaryFormId );
+
+ if ( ! temporaryElement || ! respondElement ) {
+ // Conditions for cancel link fail.
+ return;
+ }
+
+ getElementById( config.parentIdFieldId ).value = '0';
+
+ // Move the respond form back in place of the temporary element.
+ temporaryElement.parentNode.replaceChild( respondElement ,temporaryElement );
+ cancelLink.style.display = 'none';
+ event.preventDefault();
+ }
+
+ /**
+ * Click event handler.
+ *
+ * @since 5.0.0
+ *
+ * @param {Event} event The calling event.
+ */
+ function clickEvent( event ) {
+ var replyLink = this,
+ commId = getDataAttribute( replyLink, 'belowelement'),
+ parentId = getDataAttribute( replyLink, 'commentid' ),
+ respondId = getDataAttribute( replyLink, 'respondelement'),
+ postId = getDataAttribute( replyLink, 'postid'),
+ follow;
+
+ /*
+ * Third party comments systems can hook into this function via the global scope,
+ * therefore the click event needs to reference the global scope.
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- cancel.onclick = function() {
- var t = addComment,
- temp = t.I( 'wp-temp-form-div' ),
- respond = t.I( t.respondId );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ follow = window.addComment.moveForm(commId, parentId, respondId, postId);
+ if ( false === follow ) {
+ event.preventDefault();
+ }
+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( ! temp || ! respond ) {
- return;
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * Backward compatible getter of data-* attribute.
+ *
+ * Uses element.dataset if it exists, otherwise uses getAttribute.
+ *
+ * @since 5.0.0
+ *
+ * @param {HTMLElement} Element DOM element with the attribute.
+ * @param {String} Attribute the attribute to get.
+ *
+ * @return {String}
+ */
+ function getDataAttribute( element, attribute ) {
+ if ( supportsDataset ) {
+ return element.dataset[attribute];
+ }
+ else {
+ return element.getAttribute( 'data-' + attribute );
+ }
+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- t.I( 'comment_parent' ).value = '0';
- temp.parentNode.insertBefore( respond, temp );
- temp.parentNode.removeChild( temp );
- this.style.display = 'none';
- this.onclick = null;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * Get element by ID.
+ *
+ * Local alias for document.getElementById.
+ *
+ * @since 5.0.0
+ *
+ * @param {HTMLElement} The requested element.
+ */
+ function getElementById( elementId ) {
+ return document.getElementById( elementId );
+ }
+
+ /**
+ * Moves the reply form from its current position to the reply location.
+ *
+ * @since 2.7.0
+ *
+ * @param {String} addBelowId HTML ID of element the form follows.
+ * @param {String} commentId Database ID of comment being replied to.
+ * @param {String} respondId HTML ID of 'respond' element.
+ * @param {String} postId Database ID of the post.
+ */
+ function moveForm( addBelowId, commentId, respondId, postId ) {
+ // Get elements based on their IDs.
+ var addBelowElement = getElementById( addBelowId );
+ respondElement = getElementById( respondId );
+
+ // Get the hidden fields.
+ var parentIdField = getElementById( config.parentIdFieldId );
+ var postIdField = getElementById( config.postIdFieldId );
+ var element, cssHidden, style;
+
+ if ( ! addBelowElement || ! respondElement || ! parentIdField ) {
+ // Missing key elements, fail.
+ return;
+ }
+
+ addPlaceHolder( respondElement );
+
+ // Set the value of the post.
+ if ( postId && postIdField ) {
+ postIdField.value = postId;
+ }
+
+ parentIdField.value = commentId;
+
+ cancelElement.style.display = '';
+ addBelowElement.parentNode.insertBefore( respondElement, addBelowElement.nextSibling );
+
+ /*
+ * This is for backward compatibility with third party commenting systems
+ * hooking into the event using older techniques.
+ */
+ cancelElement.onclick = function(){
</ins><span class="cx" style="display: block; padding: 0 10px"> return false;
</span><span class="cx" style="display: block; padding: 0 10px"> };
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- /*
- * Sets initial focus to the first form focusable element.
- * Uses try/catch just to avoid errors in IE 7- which return visibility
- * 'inherit' when the visibility value is inherited from an ancestor.
- */
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Focus on the first field in the comment form.
</ins><span class="cx" style="display: block; padding: 0 10px"> try {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- for ( var i = 0; i < commentForm.elements.length; i++ ) {
- element = commentForm.elements[i];
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ for ( var i = 0; i < commentFormElement.elements.length; i++ ) {
+ element = commentFormElement.elements[i];
</ins><span class="cx" style="display: block; padding: 0 10px"> cssHidden = false;
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Modern browsers.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Get elements computed style.
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( 'getComputedStyle' in window ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Modern browsers.
</ins><span class="cx" style="display: block; padding: 0 10px"> style = window.getComputedStyle( element );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // IE 8.
</del><span class="cx" style="display: block; padding: 0 10px"> } else if ( document.documentElement.currentStyle ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // IE 8.
</ins><span class="cx" style="display: block; padding: 0 10px"> style = element.currentStyle;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -107,21 +273,45 @@
</span><span class="cx" style="display: block; padding: 0 10px"> // Stop after the first focusable element.
</span><span class="cx" style="display: block; padding: 0 10px"> break;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ }
+ catch(e) {
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- } catch( er ) {}
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /*
+ * false is returned for backward compatibility with third party commenting systems
+ * hooking into this function.
+ */
</ins><span class="cx" style="display: block; padding: 0 10px"> return false;
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- },
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @summary Returns the object corresponding to the given ID.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Add placeholder element.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Places a place holder element above the #respond element for
+ * the form to be returned to if needs be.
+ *
</ins><span class="cx" style="display: block; padding: 0 10px"> * @since 2.7.0
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @param {string} id The ID.
- * @returns {Element} The element belonging to the ID.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @param {HTMLelement} respondElement the #respond element holding comment form.
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- I: function( id ) {
- return document.getElementById( id );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ function addPlaceHolder( respondElement ) {
+ var temporaryFormId = config.temporaryFormId;
+ var temporaryElement = getElementById( temporaryFormId );
+
+ if ( temporaryElement ) {
+ // The element already exists, no need to recreate.
+ return;
+ }
+
+ temporaryElement = document.createElement( 'div' );
+ temporaryElement.id = temporaryFormId;
+ temporaryElement.style.display = 'none';
+ respondElement.parentNode.insertBefore( temporaryElement, respondElement );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-};
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ return {
+ init: init,
+ moveForm: moveForm
+ };
+})( window );
</ins></span></pre>
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