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comment-reply.js (12457B)

---

 /**
  * Handles the addition of the comment form.
  *
  * @since 2.7.0
  * @output wp-includes/js/comment-reply.js
  *
  * @namespace addComment
  *
  * @type {Object}
  */
 window.addComment = ( function( window ) {
 	// Avoid scope lookups on commonly used variables.
 	var document = window.document;
 
 	// Settings.
 	var config = {
 		commentReplyClass   : 'comment-reply-link',
 		commentReplyTitleId : 'reply-title',
 		cancelReplyId       : 'cancel-comment-reply-link',
 		commentFormId       : 'commentform',
 		temporaryFormId     : 'wp-temp-form-div',
 		parentIdFieldId     : 'comment_parent',
 		postIdFieldId       : 'comment_post_ID'
 	};
 
 	// Cross browser MutationObserver.
 	var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
 
 	// 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.documentElement.dataset;
 
 	// For holding the cancel element.
 	var cancelElement;
 
 	// For holding the comment form element.
 	var commentFormElement;
 
 	// The respond element.
 	var respondElement;
 
 	// The mutation observer.
 	var observer;
 
 	if ( cutsTheMustard && document.readyState !== 'loading' ) {
 		ready();
 	} else if ( cutsTheMustard ) {
 		window.addEventListener( 'DOMContentLoaded', ready, false );
 	}
 
 	/**
 	 * Sets up object variables after the DOM is ready.
 	 *
 	 * @since 5.1.1
 	 */
 	function ready() {
 		// Initialise the events.
 		init();
 
 		// Set up a MutationObserver to check for comments loaded late.
 		observeChanges();
 	}
 
 	/**
 	 * Add events to links classed .comment-reply-link.
 	 *
 	 * 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().
 	 *
 	 * @since 5.1.0
 	 *
 	 * @memberOf addComment
 	 *
 	 * @param {HTMLElement} context The parent DOM element to search for links.
 	 */
 	function init( context ) {
 		if ( ! cutsTheMustard ) {
 			return;
 		}
 
 		// Get required elements.
 		cancelElement = getElementById( config.cancelReplyId );
 		commentFormElement = getElementById( config.commentFormId );
 
 		// No cancel element, no replies.
 		if ( ! cancelElement ) {
 			return;
 		}
 
 		cancelElement.addEventListener( 'touchstart', cancelEvent );
 		cancelElement.addEventListener( 'click',      cancelEvent );
 
 		// Submit the comment form when the user types [Ctrl] or [Cmd] + [Enter].
 		var submitFormHandler = function( e ) {
 			if ( ( e.metaKey || e.ctrlKey ) && e.keyCode === 13 ) {
 				commentFormElement.removeEventListener( 'keydown', submitFormHandler );
 				e.preventDefault();
 				// The submit button ID is 'submit' so we can't call commentFormElement.submit(). Click it instead.
 				commentFormElement.submit.click();
 				return false;
 			}
 		};
 
 		if ( commentFormElement ) {
 			commentFormElement.addEventListener( 'keydown', submitFormHandler );
 		}
 
 		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 );
 		}
 	}
 
 	/**
 	 * Return all links classed .comment-reply-link.
 	 *
 	 * @since 5.1.0
 	 *
 	 * @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;
 		}
 
 		if ( document.getElementsByClassName ) {
 			// Fastest.
 			allReplyLinks = context.getElementsByClassName( selectorClass );
 		}
 		else {
 			// Fast.
 			allReplyLinks = context.querySelectorAll( '.' + selectorClass );
 		}
 
 		return allReplyLinks;
 	}
 
 	/**
 	 * Cancel event handler.
 	 *
 	 * @since 5.1.0
 	 *
 	 * @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.
 		var headingText = temporaryElement.textContent;
 		temporaryElement.parentNode.replaceChild( respondElement, temporaryElement );
 		cancelLink.style.display = 'none';
 
 		var replyHeadingElement  = getElementById( config.commentReplyTitleId );
 		var replyHeadingTextNode = replyHeadingElement && replyHeadingElement.firstChild;
 		var replyLinkToParent    = replyHeadingTextNode && replyHeadingTextNode.nextSibling;
 
 		if ( replyHeadingTextNode && replyHeadingTextNode.nodeType === Node.TEXT_NODE && headingText ) {
 			if ( replyLinkToParent && 'A' === replyLinkToParent.nodeName && replyLinkToParent.id !== config.cancelReplyId ) {
 				replyLinkToParent.style.display = '';
 			}
 
 			replyHeadingTextNode.textContent = headingText;
 		}
 
 		event.preventDefault();
 	}
 
 	/**
 	 * Click event handler.
 	 *
 	 * @since 5.1.0
 	 *
 	 * @param {Event} event The calling event.
 	 */
 	function clickEvent( event ) {
 		var replyNode = getElementById( config.commentReplyTitleId );
 		var defaultReplyHeading = replyNode && replyNode.firstChild.textContent;
 		var replyLink = this,
 			commId    = getDataAttribute( replyLink, 'belowelement' ),
 			parentId  = getDataAttribute( replyLink, 'commentid' ),
 			respondId = getDataAttribute( replyLink, 'respondelement' ),
 			postId    = getDataAttribute( replyLink, 'postid' ),
 			replyTo   = getDataAttribute( replyLink, 'replyto' ) || defaultReplyHeading,
 			follow;
 
 		if ( ! commId || ! parentId || ! respondId || ! postId ) {
 			/*
 			 * Theme or plugin defines own link via custom `wp_list_comments()` callback
 			 * and calls `moveForm()` either directly or via a custom event hook.
 			 */
 			return;
 		}
 
 		/*
 		 * Third party comments systems can hook into this function via the global scope,
 		 * therefore the click event needs to reference the global scope.
 		 */
 		follow = window.addComment.moveForm( commId, parentId, respondId, postId, replyTo );
 		if ( false === follow ) {
 			event.preventDefault();
 		}
 	}
 
 	/**
 	 * Creates a mutation observer to check for newly inserted comments.
 	 *
 	 * @since 5.1.0
 	 */
 	function observeChanges() {
 		if ( ! MutationObserver ) {
 			return;
 		}
 
 		var observerOptions = {
 			childList: true,
 			subtree: true
 		};
 
 		observer = new MutationObserver( handleChanges );
 		observer.observe( document.body, observerOptions );
 	}
 
 	/**
 	 * Handles DOM changes, calling init() if any new nodes are added.
 	 *
 	 * @since 5.1.0
 	 *
 	 * @param {Array} mutationRecords Array of MutationRecord objects.
 	 */
 	function handleChanges( mutationRecords ) {
 		var i = mutationRecords.length;
 
 		while ( i-- ) {
 			// Call init() once if any record in this set adds nodes.
 			if ( mutationRecords[ i ].addedNodes.length ) {
 				init();
 				return;
 			}
 		}
 	}
 
 	/**
 	 * Backward compatible getter of data-* attribute.
 	 *
 	 * Uses element.dataset if it exists, otherwise uses getAttribute.
 	 *
 	 * @since 5.1.0
 	 *
 	 * @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 );
 		}
 	}
 
 	/**
 	 * Get element by ID.
 	 *
 	 * Local alias for document.getElementById.
 	 *
 	 * @since 5.1.0
 	 *
 	 * @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
 	 *
 	 * @memberOf addComment
 	 *
 	 * @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.
 	 * @param {string} replyTo    Form heading content.
 	 */
 	function moveForm( addBelowId, commentId, respondId, postId, replyTo ) {
 		// 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;
 
 		var replyHeading         = getElementById( config.commentReplyTitleId );
 		var replyHeadingTextNode = replyHeading && replyHeading.firstChild;
 		var replyLinkToParent    = replyHeadingTextNode && replyHeadingTextNode.nextSibling;
 
 		if ( ! addBelowElement || ! respondElement || ! parentIdField ) {
 			// Missing key elements, fail.
 			return;
 		}
 
 		if ( 'undefined' === typeof replyTo ) {
 			replyTo = replyHeadingTextNode && replyHeadingTextNode.textContent;
 		}
 
 		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 );
 
 		if ( replyHeadingTextNode && replyHeadingTextNode.nodeType === Node.TEXT_NODE ) {
 			if ( replyLinkToParent && 'A' === replyLinkToParent.nodeName && replyLinkToParent.id !== config.cancelReplyId ) {
 				replyLinkToParent.style.display = 'none';
 			}
 
 			replyHeadingTextNode.textContent = replyTo;
 		}
 
 		/*
 		 * This is for backward compatibility with third party commenting systems
 		 * hooking into the event using older techniques.
 		 */
 		cancelElement.onclick = function() {
 			return false;
 		};
 
 		// Focus on the first field in the comment form.
 		try {
 			for ( var i = 0; i < commentFormElement.elements.length; i++ ) {
 				element = commentFormElement.elements[i];
 				cssHidden = false;
 
 				// Get elements computed style.
 				if ( 'getComputedStyle' in window ) {
 					// Modern browsers.
 					style = window.getComputedStyle( element );
 				} else if ( document.documentElement.currentStyle ) {
 					// IE 8.
 					style = element.currentStyle;
 				}
 
 				/*
 				 * For display none, do the same thing jQuery does. For visibility,
 				 * check the element computed style since browsers are already doing
 				 * the job for us. In fact, the visibility computed style is the actual
 				 * computed value and already takes into account the element ancestors.
 				 */
 				if ( ( element.offsetWidth <= 0 && element.offsetHeight <= 0 ) || style.visibility === 'hidden' ) {
 					cssHidden = true;
 				}
 
 				// Skip form elements that are hidden or disabled.
 				if ( 'hidden' === element.type || element.disabled || cssHidden ) {
 					continue;
 				}
 
 				element.focus();
 				// Stop after the first focusable element.
 				break;
 			}
 		}
 		catch(e) {
 
 		}
 
 		/*
 		 * false is returned for backward compatibility with third party commenting systems
 		 * hooking into this function.
 		 */
 		return false;
 	}
 
 	/**
 	 * Add placeholder element.
 	 *
 	 * Places a place holder element above the #respond element for
 	 * the form to be returned to if needs be.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @param {HTMLelement} respondElement the #respond element holding comment form.
 	 */
 	function addPlaceHolder( respondElement ) {
 		var temporaryFormId  = config.temporaryFormId;
 		var temporaryElement = getElementById( temporaryFormId );
 		var replyElement = getElementById( config.commentReplyTitleId );
 		var initialHeadingText = replyElement ? replyElement.firstChild.textContent : '';
 
 		if ( temporaryElement ) {
 			// The element already exists, no need to recreate.
 			return;
 		}
 
 		temporaryElement = document.createElement( 'div' );
 		temporaryElement.id = temporaryFormId;
 		temporaryElement.style.display = 'none';
 		temporaryElement.textContent = initialHeadingText;
 		respondElement.parentNode.insertBefore( temporaryElement, respondElement );
 	}
 
 	return {
 		init: init,
 		moveForm: moveForm
 	};
 })( window );