https://www.libriincantina.it/wp-includes/js/comment-reply.js?ver=7.1.2

1/**
2 * Handles the addition of the comment form.
3 *
4 * @since 2.7.0
5 * @output wp-includes/js/comment-reply.js
6 *
7 * @namespace addComment
8 *
9 * @type {Object}
10 */
11window.addComment = ( function( window ) {
12	// Avoid scope lookups on commonly used variables.
13	var document = window.document;
14
15	// Settings.
16	var config = {
17		commentReplyClass   : 'comment-reply-link',
18		commentReplyTitleId : 'reply-title',
19		cancelReplyId       : 'cancel-comment-reply-link',
20		commentFormId       : 'commentform',
21		temporaryFormId     : 'wp-temp-form-div',
22		parentIdFieldId     : 'comment_parent',
23		postIdFieldId       : 'comment_post_ID'
24	};
25
26	// Cross browser MutationObserver.
27	var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
28
29	// Check browser cuts the mustard.
30	var cutsTheMustard = 'querySelector' in document && 'addEventListener' in window;
31
32	/*
33	 * Check browser supports dataset.
34	 * !! sets the variable to true if the property exists.
35	 */
36	var supportsDataset = !! document.documentElement.dataset;
37
38	// For holding the cancel element.
39	var cancelElement;
40
41	// For holding the comment form element.
42	var commentFormElement;
43
44	// The respond element.
45	var respondElement;
46
47	// The mutation observer.
48	var observer;
49
50	if ( cutsTheMustard && document.readyState !== 'loading' ) {
51		ready();
52	} else if ( cutsTheMustard ) {
53		window.addEventListener( 'DOMContentLoaded', ready, false );
54	}
55
56	/**
57	 * Sets up object variables after the DOM is ready.
58	 *
59	 * @since 5.1.1
60	 */
61	function ready() {
62		// Initialize the events.
63		init();
64

65		// Set up a MutationObserver to check for comments loaded late.
66		observeChanges();
67	}
68
69	/**
70	 * Add events to links classed .comment-reply-link.
71	 *
72	 * Searches the context for reply links and adds the JavaScript events
73	 * required to move the comment form. To allow for lazy loading of
74	 * comments this method is exposed as window.commentReply.init().
75	 *
76	 * @since 5.1.0
77	 *
78	 * @memberOf addComment
79	 *
80	 * @param {HTMLElement} context The parent DOM element to search for links.
81	 */
82	function init( context ) {
83		if ( ! cutsTheMustard ) {
84			return;
85		}
86
87		// Get required elements.
88		cancelElement = getElementById( config.cancelReplyId );
89		commentFormElement = getElementById( config.commentFormId );
90
91		// No cancel element, no replies.
92		if ( ! cancelElement ) {
93			return;
94		}
95
96		cancelElement.addEventListener( 'click', cancelEvent );
97
98		// Submit the comment form when the user types [Ctrl] or [Cmd] + [Enter].
99		var submitFormHandler = function( e ) {
100			if ( ( e.metaKey || e.ctrlKey ) && e.keyCode === 13 && document.activeElement.tagName.toLowerCase() !== 'a' ) {
101				commentFormElement.removeEventListener( 'keydown', submitFormHandler );
102				e.preventDefault();
103				// The submit button ID is 'submit' so we can't call commentFormElement.submit(). Click it instead.
104				commentFormElement.submit.click();
105				return false;
106			}
107		};
108
109		if ( commentFormElement ) {
110			commentFormElement.addEventListener( 'keydown', submitFormHandler );
111		}
112
113		var links = replyLinks( context );
114		var element;
115
116		for ( var i = 0, l = links.length; i < l; i++ ) {
117			element = links[i];
118
119			element.addEventListener( 'click', clickEvent );
120		}
121	}
122
123	/**
124	 * Return all links classed .comment-reply-link.
125	 *
126	 * @since 5.1.0
127	 *
128	 * @param {HTMLElement} context The parent DOM element to search for links.
129	 *
130	 * @return {HTMLCollection|NodeList|Array}
131	 */
132	function replyLinks( context ) {
133		var selectorClass = config.commentReplyClass;
134		var allReplyLinks;
135
136		// childNodes is a handy check to ensure the context is a HTMLElement.
137		if ( ! context || ! context.childNodes ) {
138			context = document;
139		}
140
141		if ( document.getElementsByClassName ) {
142			// Fastest.
143			allReplyLinks = context.getElementsByClassName( selectorClass );
144		}
145		else {
146			// Fast.
147			allReplyLinks = context.querySelectorAll( '.' + selectorClass );
148		}
149
150		return allReplyLinks;
151	}
152
153	/**
154	 * Cancel event handler.
155	 *
156	 * @since 5.1.0
157	 *
158	 * @param {Event} event The calling event.
159	 */
160	function cancelEvent( event ) {
161		var cancelLink = this;
162		var temporaryFormId  = config.temporaryFormId;
163		var temporaryElement = getElementById( temporaryFormId );
164
165		if ( ! temporaryElement || ! respondElement ) {
166			// Conditions for cancel link fail.
167			return;
168		}
169
170		getElementById( config.parentIdFieldId ).value = '0';
171
172		// Move the respond form back in place of the temporary element.
173		var headingText = temporaryElement.textContent;
174		temporaryElement.parentNode.replaceChild( respondElement, temporaryElement );
175		cancelLink.style.display = 'none';
176
177		var replyHeadingElement  = getElementById( config.commentReplyTitleId );
178		var replyHeadingTextNode = replyHeadingElement && replyHeadingElement.firstChild;
179		var replyLinkToParent    = replyHeadingTextNode && replyHeadingTextNode.nextSibling;
180
181		if ( replyHeadingTextNode && replyHeadingTextNode.nodeType === Node.TEXT_NODE && headingText ) {
182			if ( replyLinkToParent && 'A' === replyLinkToParent.nodeName && replyLinkToParent.id !== config.cancelReplyId ) {
183				replyLinkToParent.style.display = '';
184			}
185
186			replyHeadingTextNode.textContent = headingText;
187		}
188
189		event.preventDefault();
190	}
191
192	/**
193	 * Click event handler.
194	 *
195	 * @since 5.1.0
196	 *
197	 * @param {Event} event The calling event.
198	 */
199	function clickEvent( event ) {
200		var replyNode = getElementById( config.commentReplyTitleId );
201		var defaultReplyHeading = replyNode && replyNode.firstChild.textContent;
202		var replyLink = this,
203			commId    = getDataAttribute( replyLink, 'belowelement' ),
204			parentId  = getDataAttribute( replyLink, 'commentid' ),
205			respondId = getDataAttribute( replyLink, 'respondelement' ),
206			postId    = getDataAttribute( replyLink, 'postid' ),
207			replyTo   = getDataAttribute( replyLink, 'replyto' ) || defaultReplyHeading,
208			follow;
209
210		if ( ! commId || ! parentId || ! respondId || ! postId ) {
211			/*
212			 * Theme or plugin defines own link via custom `wp_list_comments()` callback

213			 * and calls `moveForm()` either directly or via a custom event hook.
214			 */
215			return;
216		}
217
218		/*
219		 * Third party comments systems can hook into this function via the global scope,
220		 * therefore the click event needs to reference the global scope.
221		 */
222		follow = window.addComment.moveForm( commId, parentId, respondId, postId, replyTo );
223		if ( false === follow ) {
224			event.preventDefault();
225		}
226	}
227
228	/**
229	 * Creates a mutation observer to check for newly inserted comments.
230	 *
231	 * @since 5.1.0
232	 */
233	function observeChanges() {
234		if ( ! MutationObserver ) {
235			return;
236		}
237
238		var observerOptions = {
239			childList: true,
240			subtree: true
241		};
242
243		observer = new MutationObserver( handleChanges );
244		observer.observe( document.body, observerOptions );
245	}
246
247	/**
248	 * Handles DOM changes, calling init() if any new nodes are added.
249	 *
250	 * @since 5.1.0
251	 *
252	 * @param {Array} mutationRecords Array of MutationRecord objects.
253	 */
254	function handleChanges( mutationRecords ) {
255		var i = mutationRecords.length;
256
257		while ( i-- ) {
258			// Call init() once if any record in this set adds nodes.
259			if ( mutationRecords[ i ].addedNodes.length ) {
260				init();
261				return;
262			}
263		}
264	}
265
266	/**
267	 * Backward compatible getter of data-* attribute.
268	 *
269	 * Uses element.dataset if it exists, otherwise uses getAttribute.
270	 *
271	 * @since 5.1.0
272	 *
273	 * @param {HTMLElement} Element DOM element with the attribute.
274	 * @param {string}      Attribute the attribute to get.
275	 *
276	 * @return {string}
277	 */
278	function getDataAttribute( element, attribute ) {
279		if ( supportsDataset ) {
280			return element.dataset[attribute];
281		}
282		else {
283			return element.getAttribute( 'data-' + attribute );
284		}
285	}
286
287	/**
288	 * Get element by ID.
289	 *
290	 * Local alias for document.getElementById.
291	 *
292	 * @since 5.1.0
293	 *
294	 * @param {HTMLElement} The requested element.
295	 */
296	function getElementById( elementId ) {
297		return document.getElementById( elementId );
298	}
299
300	/**
301	 * Moves the reply form from its current position to the reply location.
302	 *
303	 * @since 2.7.0
304	 *
305	 * @memberOf addComment
306	 *
307	 * @param {string} addBelowId HTML ID of element the form follows.
308	 * @param {string} commentId  Database ID of comment being replied to.
309	 * @param {string} respondId  HTML ID of 'respond' element.
310	 * @param {string} postId     Database ID of the post.
311	 * @param {string} replyTo    Form heading content.
312	 */
313	function moveForm( addBelowId, commentId, respondId, postId, replyTo ) {
314		// Get elements based on their IDs.
315		var addBelowElement = getElementById( addBelowId );
316		respondElement  = getElementById( respondId );
317
318		// Get the hidden fields.
319		var parentIdField   = getElementById( config.parentIdFieldId );
320		var postIdField     = getElementById( config.postIdFieldId );
321		var element, cssHidden, style;
322
323		var replyHeading         = getElementById( config.commentReplyTitleId );
324		var replyHeadingTextNode = replyHeading && replyHeading.firstChild;
325		var replyLinkToParent    = replyHeadingTextNode && replyHeadingTextNode.nextSibling;
326
327		if ( ! addBelowElement || ! respondElement || ! parentIdField ) {
328			// Missing key elements, fail.
329			return;
330		}
331
332		if ( 'undefined' === typeof replyTo ) {
333			replyTo = replyHeadingTextNode && replyHeadingTextNode.textContent;
334		}
335
336		addPlaceHolder( respondElement );
337
338		// Set the value of the post.
339		if ( postId && postIdField ) {
340			postIdField.value = postId;
341		}
342
343		parentIdField.value = commentId;
344
345		cancelElement.style.display = '';
346		addBelowElement.parentNode.insertBefore( respondElement, addBelowElement.nextSibling );
347
348		if ( replyHeadingTextNode && replyHeadingTextNode.nodeType === Node.TEXT_NODE ) {
349			if ( replyLinkToParent && 'A' === replyLinkToParent.nodeName && replyLinkToParent.id !== config.cancelReplyId ) {
350				replyLinkToParent.style.display = 'none';
351			}
352
353			replyHeadingTextNode.textContent = replyTo;
354		}
355
356		/*
357		 * This is for backward compatibility with third party commenting systems
358		 * hooking into the event using older techniques.
359		 */
360		cancelElement.onclick = function() {
361			return false;
362		};
363
364		// Focus on the first field in the comment form.
365		try {
366			for ( var i = 0; i < commentFormElement.elements.length; i++ ) {
367				element = commentFormElement.elements[i];
368				cssHidden = false;

369
370				// Get elements computed style.
371				if ( 'getComputedStyle' in window ) {
372					// Modern browsers.
373					style = window.getComputedStyle( element );
374				} else if ( document.documentElement.currentStyle ) {
375					// IE 8.
376					style = element.currentStyle;
377				}
378
379				/*
380				 * For display none, do the same thing jQuery does. For visibility,
381				 * check the element computed style since browsers are already doing
382				 * the job for us. In fact, the visibility computed style is the actual
383				 * computed value and already takes into account the element ancestors.
384				 */
385				if ( ( element.offsetWidth <= 0 && element.offsetHeight <= 0 ) || style.visibility === 'hidden' ) {
386					cssHidden = true;
387				}
388
389				// Skip form elements that are hidden or disabled.
390				if ( 'hidden' === element.type || element.disabled || cssHidden ) {
391					continue;
392				}
393
394				element.focus();
395				// Stop after the first focusable element.
396				break;
397			}
398		}
399		catch(e) {
400
401		}
402
403		/*
404		 * false is returned for backward compatibility with third party commenting systems
405		 * hooking into this function.
406		 */
407		return false;
408	}
409
410	/**
411	 * Add placeholder element.
412	 *
413	 * Places a place holder element above the #respond element for
414	 * the form to be returned to if needs be.
415	 *
416	 * @since 2.7.0
417	 *
418	 * @param {HTMLelement} respondElement the #respond element holding comment form.
419	 */
420	function addPlaceHolder( respondElement ) {
421		var temporaryFormId  = config.temporaryFormId;
422		var temporaryElement = getElementById( temporaryFormId );
423		var replyElement = getElementById( config.commentReplyTitleId );
424		var initialHeadingText = replyElement ? replyElement.firstChild.textContent : '';
425
426		if ( temporaryElement ) {
427			// The element already exists, no need to recreate.
428			return;
429		}
430
431		temporaryElement = document.createElement( 'div' );
432		temporaryElement.id = temporaryFormId;
433		temporaryElement.style.display = 'none';
434		temporaryElement.textContent = initialHeadingText;
435		respondElement.parentNode.insertBefore( temporaryElement, respondElement );
436	}
437
438	return {
439		init: init,
440		moveForm: moveForm
441	};
442})( window );