1/*
  2 * Script run inside a Customizer preview frame.
  3 *
  4 * @output wp-includes/js/customize-preview.js
  5 */
  6(function( exports, $ ){
  7	var api = wp.customize,
  8		debounce,
  9		currentHistoryState = {};
 10
 11	/*
 12	 * Capture the state that is passed into history.replaceState() and history.pushState()
 13	 * and also which is returned in the popstate event so that when the changeset_uuid
 14	 * gets updated when transitioning to a new changeset there the current state will
 15	 * be supplied in the call to history.replaceState().
 16	 */
 17	( function( history ) {
 18		var injectUrlWithState;
 19
 20		if ( ! history.replaceState ) {
 21			return;
 22		}
 23
 24		/**
 25		 * Amend the supplied URL with the customized state.
 26		 *
 27		 * @since 4.7.0
 28		 * @access private
 29		 *
 30		 * @param {string} url URL.
 31		 * @return {string} URL with customized state.
 32		 */
 33		injectUrlWithState = function( url ) {
 34			var urlParser, oldQueryParams, newQueryParams;
 35			urlParser = document.createElement( 'a' );
 36			urlParser.href = url;
 37			oldQueryParams = api.utils.parseQueryString( location.search.substr( 1 ) );
 38			newQueryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
 39
 40			newQueryParams.customize_changeset_uuid = oldQueryParams.customize_changeset_uuid;
 41			if ( oldQueryParams.customize_autosaved ) {
 42				newQueryParams.customize_autosaved = 'on';
 43			}
 44			if ( oldQueryParams.customize_theme ) {
 45				newQueryParams.customize_theme = oldQueryParams.customize_theme;
 46			}
 47			if ( oldQueryParams.customize_messenger_channel ) {
 48				newQueryParams.customize_messenger_channel = oldQueryParams.customize_messenger_channel;
 49			}
 50			urlParser.search = $.param( newQueryParams );
 51			return urlParser.href;
 52		};
 53
 54		history.replaceState = ( function( nativeReplaceState ) {
 55			return function historyReplaceState( data, title, url ) {
 56				currentHistoryState = data;
 57				return nativeReplaceState.call( history, data, title, 'string' === typeof url && url.length > 0 ? injectUrlWithState( url ) : url );
 58			};
 59		} )( history.replaceState );
 60
 61		history.pushState = ( function( nativePushState ) {
 62			return function historyPushState( data, title, url ) {
 63				currentHistoryState = data;
 64				return nativePushState.call( history, data, title, 'string' === typeof url && url.length > 0 ? injectUrlWithState( url ) : url );
 65			};
 66		} )( history.pushState );
 67
 68		window.addEventListener( 'popstate', function( event ) {
 69			currentHistoryState = event.state;
 70		} );
 71
 72	}( history ) );
 73
 74	/**
 75	 * Returns a debounced version of the function.
 76	 *
 77	 * @todo Require Underscore.js for this file and retire this.
 78	 */
 79	debounce = function( fn, delay, context ) {
 80		var timeout;
 81		return function() {
 82			var args = arguments;
 83
 84			context = context || this;
 85
 86			clearTimeout( timeout );
 87			timeout = setTimeout( function() {
 88				timeout = null;
 89				fn.apply( context, args );
 90			}, delay );
 91		};
 92	};
 93
 94	/**
 95	 * @memberOf wp.customize
 96	 * @alias wp.customize.Preview
 97	 *
 98	 * @constructor
 99	 * @augments wp.customize.Messenger
100	 * @augments wp.customize.Class
101	 * @mixes wp.customize.Events
102	 */
103	api.Preview = api.Messenger.extend(/** @lends wp.customize.Preview.prototype */{
104		/**
105		 * @param {Object} params  - Parameters to configure the messenger.
106		 * @param {Object} options - Extend any instance parameter or method with this object.
107		 */
108		initialize: function( params, options ) {
109			var preview = this, urlParser = document.createElement( 'a' );
110
111			api.Messenger.prototype.initialize.call( preview, params, options );
112
113			urlParser.href = preview.origin();
114			preview.add( 'scheme', urlParser.protocol.replace( /:$/, '' ) );
115
116			preview.body = $( document.body );
117			preview.window = $( window );
118
119			if ( api.settings.channel ) {
120
121				// If in an iframe, then intercept the link clicks and form submissions.
122				preview.body.on( 'click.preview', 'a', function( event ) {
123					preview.handleLinkClick( event );
124				} );
125				preview.body.on( 'submit.preview', 'form', function( event ) {
126					preview.handleFormSubmit( event );
127				} );
128
129				preview.window.on( 'scroll.preview', debounce( function() {
130					preview.send( 'scroll', preview.window.scrollTop() );
131				}, 200 ) );
132
133				preview.bind( 'scroll', function( distance ) {
134					preview.window.scrollTop( distance );
135				});
136			}
137		},
138
139		/**
140		 * Handle link clicks in preview.
141		 *
142		 * @since 4.7.0
143		 * @access public
144		 *
145		 * @param {jQuery.Event} event Event.
146		 */
147		handleLinkClick: function( event ) {
148			var preview = this, link, isInternalJumpLink;
149			link = $( event.target ).closest( 'a' );
150
151			// No-op if the anchor is not a link.
152			if ( _.isUndefined( link.attr( 'href' ) ) ) {
153				return;
154			}
155
156			// Allow internal jump links and JS links to behave normally without preventing default.
157			isInternalJumpLink = ( '#' === link.attr( 'href' ).substr( 0, 1 ) );
158			if ( isInternalJumpLink || ! /^https?:$/.test( link.prop( 'protocol' ) ) ) {
159				return;
160			}
161
162			// If the link is not previewable, prevent the browser from navigating to it.
163			if ( ! api.isLinkPreviewable( link[0] ) ) {
164				wp.a11y.speak( api.settings.l10n.linkUnpreviewable );
165				event.preventDefault();
166				return;
167			}
168
169			// Prevent initiating navigating from click and instead rely on sending url message to pane.
170			event.preventDefault();
171
172			/*
173			 * Note the shift key is checked so shift+click on widgets or
174			 * nav menu items can just result on focusing on the corresponding
175			 * control instead of also navigating to the URL linked to.
176			 */
177			if ( event.shiftKey ) {
178				return;
179			}
180
181			// Note: It's not relevant to send scroll because sending url message will have the same effect.
182			preview.send( 'url', link.prop( 'href' ) );
183		},
184
185		/**
186		 * Handle form submit.
187		 *
188		 * @since 4.7.0
189		 * @access public
190		 *
191		 * @param {jQuery.Event} event Event.
192		 */
193		handleFormSubmit: function( event ) {
194			var preview = this, urlParser, form;
195			urlParser = document.createElement( 'a' );
196			form = $( event.target );
197			urlParser.href = form.prop( 'action' );
198
199			// If the link is not previewable, prevent the browser from navigating to it.
200			if ( 'GET' !== form.prop( 'method' ).toUpperCase() || ! api.isLinkPreviewable( urlParser ) ) {
201				wp.a11y.speak( api.settings.l10n.formUnpreviewable );
202				event.preventDefault();
203				return;
204			}
205
206			/*
207			 * If the default wasn't prevented already (in which case the form
208			 * submission is already being handled by JS), and if it has a GET
209			 * request method, then take the serialized form data and add it as
210			 * a query string to the action URL and send this in a url message
211			 * to the customizer pane so that it will be loaded. If the form's
212			 * action points to a non-previewable URL, the customizer pane's
213			 * previewUrl setter will reject it so that the form submission is
214			 * a no-op, which is the same behavior as when clicking a link to an
215			 * external site in the preview.
216			 */
217			if ( ! event.isDefaultPrevented() ) {
218				if ( urlParser.search.length > 1 ) {
219					urlParser.search += '&';
220				}
221				urlParser.search += form.serialize();
222				preview.send( 'url', urlParser.href );
223			}
224
225			// Prevent default since navigation should be done via sending url message or via JS submit handler.
226			event.preventDefault();
227		}
228	});
229
230	/**
231	 * Inject the changeset UUID into links in the document.
232	 *
233	 * @since 4.7.0
234	 * @access protected
235	 * @access private
236	 *
237	 * @return {void}
238	 */
239	api.addLinkPreviewing = function addLinkPreviewing() {
240		var linkSelectors = 'a[href], area[href]';
241
242		// Inject links into initial document.
243		$( document.body ).find( linkSelectors ).each( function() {
244			api.prepareLinkPreview( this );
245		} );
246
247		// Inject links for new elements added to the page.
248		if ( 'undefined' !== typeof MutationObserver ) {
249			api.mutationObserver = new MutationObserver( function( mutations ) {
250				_.each( mutations, function( mutation ) {
251					$( mutation.target ).find( linkSelectors ).each( function() {
252						api.prepareLinkPreview( this );
253					} );
254				} );
255			} );
256			api.mutationObserver.observe( document.documentElement, {
257				childList: true,
258				subtree: true
259			} );
260		} else {
261
262			// If mutation observers aren't available, fallback to just-in-time injection.
263			$( document.documentElement ).on( 'click focus mouseover', linkSelectors, function() {
264				api.prepareLinkPreview( this );
265			} );
266		}
267	};
268
269	/**
270	 * Should the supplied link is previewable.
271	 *
272	 * @since 4.7.0
273	 * @access public
274	 *
275	 * @param {HTMLAnchorElement|HTMLAreaElement} element Link element.
276	 * @param {string} element.search Query string.
277	 * @param {string} element.pathname Path.
278	 * @param {string} element.host Host.
279	 * @param {Object} [options]
280	 * @param {Object} [options.allowAdminAjax=false] Allow admin-ajax.php requests.
281	 * @return {boolean} Is appropriate for changeset link.
282	 */
283	api.isLinkPreviewable = function isLinkPreviewable( element, options ) {
284		var matchesAllowedUrl, parsedAllowedUrl, args, elementHost;
285
286		args = _.extend( {}, { allowAdminAjax: false }, options || {} );
287
288		if ( 'javascript:' === element.protocol ) { // jshint ignore:line
289			return true;
290		}
291
292		// Only web URLs can be previewed.
293		if ( 'https:' !== element.protocol && 'http:' !== element.protocol ) {
294			return false;
295		}
296
297		elementHost = element.host.replace( /:(80|443)$/, '' );
298		parsedAllowedUrl = document.createElement( 'a' );
299		matchesAllowedUrl = ! _.isUndefined( _.find( api.settings.url.allowed, function( allowedUrl ) {
300			parsedAllowedUrl.href = allowedUrl;
301			return parsedAllowedUrl.protocol === element.protocol && parsedAllowedUrl.host.replace( /:(80|443)$/, '' ) === elementHost && 0 === element.pathname.indexOf( parsedAllowedUrl.pathname.replace( /\/$/, '' ) );
302		} ) );
303		if ( ! matchesAllowedUrl ) {
304			return false;
305		}
306
307		// Skip wp login and signup pages.
308		if ( /\/wp-(login|signup)\.php$/.test( element.pathname ) ) {
309			return false;
310		}
311
312		// Allow links to admin ajax as faux frontend URLs.
313		if ( /\/wp-admin\/admin-ajax\.php$/.test( element.pathname ) ) {
314			return args.allowAdminAjax;
315		}
316
317		// Disallow links to admin, includes, and content.
318		if ( /\/wp-(admin|includes|content)(\/|$)/.test( element.pathname ) ) {
319			return false;
320		}
321
322		return true;
323	};
324
325	/**
326	 * Inject the customize_changeset_uuid query param into links on the frontend.
327	 *
328	 * @since 4.7.0
329	 * @access protected
330	 *
331	 * @param {HTMLAnchorElement|HTMLAreaElement} element Link element.
332	 * @param {string} element.search Query string.
333	 * @param {string} element.host Host.
334	 * @param {string} element.protocol Protocol.
335	 * @return {void}
336	 */
337	api.prepareLinkPreview = function prepareLinkPreview( element ) {
338		var queryParams, $element = $( element );
339
340        // Skip elements with no href attribute. Check first to avoid more expensive checks down the road.
341        if ( ! element.hasAttribute( 'href' ) ) {
342            return;
343        }
344
345		// Skip links in admin bar.
346		if ( $element.closest( '#wpadminbar' ).length ) {
347			return;
348		}
349
350		// Ignore links with href="#", href="#id", or non-HTTP protocols (e.g. javascript: and mailto:).
351		if ( '#' === $element.attr( 'href' ).substr( 0, 1 ) || ! /^https?:$/.test( element.protocol ) ) {
352			return;
353		}
354
355		// Make sure links in preview use HTTPS if parent frame uses HTTPS.
356		if ( api.settings.channel && 'https' === api.preview.scheme.get() && 'http:' === element.protocol && -1 !== api.settings.url.allowedHosts.indexOf( element.host ) ) {
357			element.protocol = 'https:';
358		}
359
360		// Ignore links with class wp-playlist-caption.
361		if ( $element.hasClass( 'wp-playlist-caption' ) ) {
362			return;
363		}
364
365		if ( ! api.isLinkPreviewable( element ) ) {
366
367			// Style link as unpreviewable only if previewing in iframe; if previewing on frontend, links will be allowed to work normally.
368			if ( api.settings.channel ) {
369				$element.addClass( 'customize-unpreviewable' );
370			}
371			return;
372		}
373		$element.removeClass( 'customize-unpreviewable' );
374
375		queryParams = api.utils.parseQueryString( element.search.substring( 1 ) );
376		queryParams.customize_changeset_uuid = api.settings.changeset.uuid;
377		if ( api.settings.changeset.autosaved ) {
378			queryParams.customize_autosaved = 'on';
379		}
380		if ( ! api.settings.theme.active ) {
381			queryParams.customize_theme = api.settings.theme.stylesheet;
382		}
383		if ( api.settings.channel ) {
384			queryParams.customize_messenger_channel = api.settings.channel;
385		}
386		element.search = $.param( queryParams );
387	};
388
389	/**
390	 * Inject the changeset UUID into Ajax requests.
391	 *
392	 * @since 4.7.0
393	 * @access protected
394	 *
395	 * @return {void}
396	 */
397	api.addRequestPreviewing = function addRequestPreviewing() {
398
399		/**
400		 * Rewrite Ajax requests to inject customizer state.
401		 *
402		 * @param {Object} options Options.
403		 * @param {string} options.type Type.
404		 * @param {string} options.url URL.
405		 * @param {Object} originalOptions Original options.
406		 * @param {XMLHttpRequest} xhr XHR.
407		 * @return {void}
408		 */
409		var prefilterAjax = function( options, originalOptions, xhr ) {
410			var urlParser, queryParams, requestMethod, dirtyValues = {};
411			urlParser = document.createElement( 'a' );
412			urlParser.href = options.url;
413
414			// Abort if the request is not for this site.
415			if ( ! api.isLinkPreviewable( urlParser, { allowAdminAjax: true } ) ) {
416				return;
417			}
418			queryParams = api.utils.parseQueryString( urlParser.search.substring( 1 ) );
419
420			// Note that _dirty flag will be cleared with changeset updates.
421			api.each( function( setting ) {
422				if ( setting._dirty ) {
423					dirtyValues[ setting.id ] = setting.get();
424				}
425			} );
426
427			if ( ! _.isEmpty( dirtyValues ) ) {
428				requestMethod = options.type.toUpperCase();
429
430				// Override underlying request method to ensure unsaved changes to changeset can be included (force Backbone.emulateHTTP).
431				if ( 'POST' !== requestMethod ) {
432					xhr.setRequestHeader( 'X-HTTP-Method-Override', requestMethod );
433					queryParams._method = requestMethod;
434					options.type = 'POST';
435				}
436
437				// Amend the post data with the customized values.
438				if ( options.data ) {
439					options.data += '&';
440				} else {
441					options.data = '';
442				}
443				options.data += $.param( {
444					customized: JSON.stringify( dirtyValues )
445				} );
446			}
447
448			// Include customized state query params in URL.
449			queryParams.customize_changeset_uuid = api.settings.changeset.uuid;
450			if ( api.settings.changeset.autosaved ) {
451				queryParams.customize_autosaved = 'on';
452			}
453			if ( ! api.settings.theme.active ) {
454				queryParams.customize_theme = api.settings.theme.stylesheet;
455			}
456
457			// Ensure preview nonce is included with every customized request, to allow post data to be read.
458			queryParams.customize_preview_nonce = api.settings.nonce.preview;
459
460			urlParser.search = $.param( queryParams );
461			options.url = urlParser.href;
462		};
463
464		$.ajaxPrefilter( prefilterAjax );
465	};
466
467	/**
468	 * Inject changeset UUID into forms, allowing preview to persist through submissions.
469	 *
470	 * @since 4.7.0
471	 * @access protected
472	 *
473	 * @return {void}
474	 */
475	api.addFormPreviewing = function addFormPreviewing() {
476
477		// Inject inputs for forms in initial document.
478		$( document.body ).find( 'form' ).each( function() {
479			api.prepareFormPreview( this );
480		} );
481
482		// Inject inputs for new forms added to the page.
483		if ( 'undefined' !== typeof MutationObserver ) {
484			api.mutationObserver = new MutationObserver( function( mutations ) {
485				_.each( mutations, function( mutation ) {
486					$( mutation.target ).find( 'form' ).each( function() {
487						api.prepareFormPreview( this );
488					} );
489				} );
490			} );
491			api.mutationObserver.observe( document.documentElement, {
492				childList: true,
493				subtree: true
494			} );
495		}
496	};
497
498	/**
499	 * Inject changeset into form inputs.
500	 *
501	 * @since 4.7.0
502	 * @access protected
503	 *
504	 * @param {HTMLFormElement} form Form.
505	 * @return {void}
506	 */
507	api.prepareFormPreview = function prepareFormPreview( form ) {
508		var urlParser, stateParams = {};
509
510		if ( ! form.action ) {
511			form.action = location.href;
512		}
513
514		urlParser = document.createElement( 'a' );
515		urlParser.href = form.action;
516
517		// Make sure forms in preview use HTTPS if parent frame uses HTTPS.
518		if ( api.settings.channel && 'https' === api.preview.scheme.get() && 'http:' === urlParser.protocol && -1 !== api.settings.url.allowedHosts.indexOf( urlParser.host ) ) {
519			urlParser.protocol = 'https:';
520			form.action = urlParser.href;
521		}
522
523		if ( 'GET' !== form.method.toUpperCase() || ! api.isLinkPreviewable( urlParser ) ) {
524
525			// Style form as unpreviewable only if previewing in iframe; if previewing on frontend, all forms will be allowed to work normally.
526			if ( api.settings.channel ) {
527				$( form ).addClass( 'customize-unpreviewable' );
528			}
529			return;
530		}
531		$( form ).removeClass( 'customize-unpreviewable' );
532
533		stateParams.customize_changeset_uuid = api.settings.changeset.uuid;
534		if ( api.settings.changeset.autosaved ) {
535			stateParams.customize_autosaved = 'on';
536		}
537		if ( ! api.settings.theme.active ) {
538			stateParams.customize_theme = api.settings.theme.stylesheet;
539		}
540		if ( api.settings.channel ) {
541			stateParams.customize_messenger_channel = api.settings.channel;
542		}
543
544		_.each( stateParams, function( value, name ) {
545			var input = $( form ).find( 'input[name="' + name + '"]' );
546			if ( input.length ) {
547				input.val( value );
548			} else {
549				$( form ).prepend( $( '<input>', {
550					type: 'hidden',
551					name: name,
552					value: value
553				} ) );
554			}
555		} );
556
557		// Prevent links from breaking out of preview iframe.
558		if ( api.settings.channel ) {
559			form.target = '_self';
560		}
561	};
562
563	/**
564	 * Watch current URL and send keep-alive (heartbeat) messages to the parent.
565	 *
566	 * Keep the customizer pane notified that the preview is still alive
567	 * and that the user hasn't navigated to a non-customized URL.
568	 *
569	 * @since 4.7.0
570	 * @access protected
571	 */
572	api.keepAliveCurrentUrl = ( function() {
573		var previousPathName = location.pathname,
574			previousQueryString = location.search.substr( 1 ),
575			previousQueryParams = null,
576			stateQueryParams = [ 'customize_theme', 'customize_changeset_uuid', 'customize_messenger_channel', 'customize_autosaved' ];
577
578		return function keepAliveCurrentUrl() {
579			var urlParser, currentQueryParams;
580
581			// Short-circuit with keep-alive if previous URL is identical (as is normal case).
582			if ( previousQueryString === location.search.substr( 1 ) && previousPathName === location.pathname ) {
583				api.preview.send( 'keep-alive' );
584				return;
585			}
586
587			urlParser = document.createElement( 'a' );
588			if ( null === previousQueryParams ) {
589				urlParser.search = previousQueryString;
590				previousQueryParams = api.utils.parseQueryString( previousQueryString );
591				_.each( stateQueryParams, function( name ) {
592					delete previousQueryParams[ name ];
593				} );
594			}
595
596			// Determine if current URL minus customized state params and URL hash.
597			urlParser.href = location.href;
598			currentQueryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
599			_.each( stateQueryParams, function( name ) {
600				delete currentQueryParams[ name ];
601			} );
602
603			if ( previousPathName !== location.pathname || ! _.isEqual( previousQueryParams, currentQueryParams ) ) {
604				urlParser.search = $.param( currentQueryParams );
605				urlParser.hash = '';
606				api.settings.url.self = urlParser.href;
607				api.preview.send( 'ready', {
608					currentUrl: api.settings.url.self,
609					activePanels: api.settings.activePanels,
610					activeSections: api.settings.activeSections,
611					activeControls: api.settings.activeControls,
612					settingValidities: api.settings.settingValidities
613				} );
614			} else {
615				api.preview.send( 'keep-alive' );
616			}
617			previousQueryParams = currentQueryParams;
618			previousQueryString = location.search.substr( 1 );
619			previousPathName = location.pathname;
620		};
621	} )();
622
623	api.settingPreviewHandlers = {
624
625		/**
626		 * Preview changes to custom logo.
627		 *
628		 * @param {number} attachmentId Attachment ID for custom logo.
629		 * @return {void}
630		 */
631		custom_logo: function( attachmentId ) {
632			$( 'body' ).toggleClass( 'wp-custom-logo', !! attachmentId );
633		},
634
635		/**
636		 * Preview changes to custom css.
637		 *
638		 * @param {string} value Custom CSS.
639		 * @return {void}
640		 */
641		custom_css: function( value ) {
642			var style;
643			if ( api.settings.theme.isBlockTheme ) {
644				style = $( 'style#global-styles-inline-css' );
645
646				// Forbid milestone comments from appearing in Custom CSS which would break live preview.
647				value = value.replace( /\/\*(BEGIN|END)_CUSTOMIZER_CUSTOM_CSS\*\//g, '' );
648
649				var textContent = style.text().replace(
650					/(\/\*BEGIN_CUSTOMIZER_CUSTOM_CSS\*\/)((?:.|\s)*?)(\/\*END_CUSTOMIZER_CUSTOM_CSS\*\/)/,
651					function ( match, beforeComment, oldValue, afterComment ) {
652						return beforeComment + '\n' + value + '\n' + afterComment;
653					}
654				);
655				style.text( textContent );
656			} else {
657				style = $( 'style#wp-custom-css' );
658				style.text( value );
659			}
660		},
661
662		/**
663		 * Preview changes to any of the background settings.
664		 *
665		 * @return {void}
666		 */
667		background: function() {
668			var css = '', settings = {};
669
670			_.each( ['color', 'image', 'preset', 'position_x', 'position_y', 'size', 'repeat', 'attachment'], function( prop ) {
671				settings[ prop ] = api( 'background_' + prop );
672			} );
673
674			/*
675			 * The body will support custom backgrounds if either the color or image are set.
676			 *
677			 * See get_body_class() in /wp-includes/post-template.php
678			 */
679			$( document.body ).toggleClass( 'custom-background', !! ( settings.color() || settings.image() ) );
680
681			if ( settings.color() ) {
682				css += 'background-color: ' + settings.color() + ';';
683			}
684
685			if ( settings.image() ) {
686				css += 'background-image: url("' + settings.image() + '");';
687				css += 'background-size: ' + settings.size() + ';';
688				css += 'background-position: ' + settings.position_x() + ' ' + settings.position_y() + ';';
689				css += 'background-repeat: ' + settings.repeat() + ';';
690				css += 'background-attachment: ' + settings.attachment() + ';';
691			}
692
693			$( '#custom-background-css' ).text( 'body.custom-background { ' + css + ' }' );
694		}
695	};
696
697	$( function() {
698		var bg, setValue, handleUpdatedChangesetUuid;
699
700		api.settings = window._wpCustomizeSettings;
701		if ( ! api.settings ) {
702			return;
703		}
704
705		api.preview = new api.Preview({
706			url: window.location.href,
707			channel: api.settings.channel
708		});
709
710		api.addLinkPreviewing();
711		api.addRequestPreviewing();
712		api.addFormPreviewing();
713
714		/**
715		 * Create/update a setting value.
716		 *
717		 * @param {string}  id            - Setting ID.
718		 * @param {*}       value         - Setting value.
719		 * @param {boolean} [createDirty] - Whether to create a setting as dirty. Defaults to false.
720		 */
721		setValue = function( id, value, createDirty ) {
722			var setting = api( id );
723			if ( setting ) {
724				setting.set( value );
725			} else {
726				createDirty = createDirty || false;
727				setting = api.create( id, value, {
728					id: id
729				} );
730
731				// Mark dynamically-created settings as dirty so they will get posted.
732				if ( createDirty ) {
733					setting._dirty = true;
734				}
735			}
736		};
737
738		api.preview.bind( 'settings', function( values ) {
739			$.each( values, setValue );
740		});
741
742		api.preview.trigger( 'settings', api.settings.values );
743
744		$.each( api.settings._dirty, function( i, id ) {
745			var setting = api( id );
746			if ( setting ) {
747				setting._dirty = true;
748			}
749		} );
750
751		api.preview.bind( 'setting', function( args ) {
752			var createDirty = true;
753			setValue.apply( null, args.concat( createDirty ) );
754		});
755
756		api.preview.bind( 'sync', function( events ) {
757
758			/*
759			 * Delete any settings that already exist locally which haven't been
760			 * modified in the controls while the preview was loading. This prevents
761			 * situations where the JS value being synced from the pane may differ
762			 * from the PHP-sanitized JS value in the preview which causes the
763			 * non-sanitized JS value to clobber the PHP-sanitized value. This
764			 * is particularly important for selective refresh partials that
765			 * have a fallback refresh behavior since infinite refreshing would
766			 * result.
767			 */
768			if ( events.settings && events['settings-modified-while-loading'] ) {
769				_.each( _.keys( events.settings ), function( syncedSettingId ) {
770					if ( api.has( syncedSettingId ) && ! events['settings-modified-while-loading'][ syncedSettingId ] ) {
771						delete events.settings[ syncedSettingId ];
772					}
773				} );
774			}
775
776			$.each( events, function( event, args ) {
777				api.preview.trigger( event, args );
778			});
779			api.preview.send( 'synced' );
780		});
781
782		api.preview.bind( 'active', function() {
783			api.preview.send( 'nonce', api.settings.nonce );
784
785			api.preview.send( 'documentTitle', document.title );
786
787			// Send scroll in case of loading via non-refresh.
788			api.preview.send( 'scroll', $( window ).scrollTop() );
789		});
790
791		/**
792		 * Handle update to changeset UUID.
793		 *
794		 * @param {string} uuid - UUID.
795		 * @return {void}
796		 */
797		handleUpdatedChangesetUuid = function( uuid ) {
798			api.settings.changeset.uuid = uuid;
799
800			// Update UUIDs in links and forms.
801			$( document.body ).find( 'a[href], area[href]' ).each( function() {
802				api.prepareLinkPreview( this );
803			} );
804			$( document.body ).find( 'form' ).each( function() {
805				api.prepareFormPreview( this );
806			} );
807
808			/*
809			 * Replace the UUID in the URL. Note that the wrapped history.replaceState()
810			 * will handle injecting the current api.settings.changeset.uuid into the URL,
811			 * so this is merely to trigger that logic.
812			 */
813			if ( history.replaceState ) {
814				history.replaceState( currentHistoryState, '', location.href );
815			}
816		};
817
818		api.preview.bind( 'changeset-uuid', handleUpdatedChangesetUuid );
819
820		api.preview.bind( 'saved', function( response ) {
821			if ( response.next_changeset_uuid ) {
822				handleUpdatedChangesetUuid( response.next_changeset_uuid );
823			}
824			api.trigger( 'saved', response );
825		} );
826
827		// Update the URLs to reflect the fact we've started autosaving.
828		api.preview.bind( 'autosaving', function() {
829			if ( api.settings.changeset.autosaved ) {
830				return;
831			}
832
833			api.settings.changeset.autosaved = true; // Start deferring to any autosave once changeset is updated.
834
835			$( document.body ).find( 'a[href], area[href]' ).each( function() {
836				api.prepareLinkPreview( this );
837			} );
838			$( document.body ).find( 'form' ).each( function() {
839				api.prepareFormPreview( this );
840			} );
841			if ( history.replaceState ) {
842				history.replaceState( currentHistoryState, '', location.href );
843			}
844		} );
845
846		/*
847		 * Clear dirty flag for settings when saved to changeset so that they
848		 * won't be needlessly included in selective refresh or ajax requests.
849		 */
850		api.preview.bind( 'changeset-saved', function( data ) {
851			_.each( data.saved_changeset_values, function( value, settingId ) {
852				var setting = api( settingId );
853				if ( setting && _.isEqual( setting.get(), value ) ) {
854					setting._dirty = false;
855				}
856			} );
857		} );
858
859		api.preview.bind( 'nonce-refresh', function( nonce ) {
860			$.extend( api.settings.nonce, nonce );
861		} );
862
863		/*
864		 * Send a message to the parent customize frame with a list of which
865		 * containers and controls are active.
866		 */
867		api.preview.send( 'ready', {
868			currentUrl: api.settings.url.self,
869			activePanels: api.settings.activePanels,
870			activeSections: api.settings.activeSections,
871			activeControls: api.settings.activeControls,
872			settingValidities: api.settings.settingValidities
873		} );
874
875		// Send ready when URL changes via JS.
876		setInterval( api.keepAliveCurrentUrl, api.settings.timeouts.keepAliveSend );
877
878		// Display a loading indicator when preview is reloading, and remove on failure.
879		api.preview.bind( 'loading-initiated', function () {
880			$( 'body' ).addClass( 'wp-customizer-unloading' );
881		});
882		api.preview.bind( 'loading-failed', function () {
883			$( 'body' ).removeClass( 'wp-customizer-unloading' );
884		});
885
886		/* Custom Backgrounds */
887		bg = $.map( ['color', 'image', 'preset', 'position_x', 'position_y', 'size', 'repeat', 'attachment'], function( prop ) {
888			return 'background_' + prop;
889		} );
890
891		api.when.apply( api, bg ).done( function() {
892			$.each( arguments, function() {
893				this.bind( api.settingPreviewHandlers.background );
894			});
895		});
896
897		/**
898		 * Custom Logo
899		 *
900		 * Toggle the wp-custom-logo body class when a logo is added or removed.
901		 *
902		 * @since 4.5.0
903		 */
904		api( 'custom_logo', function ( setting ) {
905			api.settingPreviewHandlers.custom_logo.call( setting, setting.get() );
906			setting.bind( api.settingPreviewHandlers.custom_logo );
907		} );
908
909		api( 'custom_css[' + api.settings.theme.stylesheet + ']', function( setting ) {
910			setting.bind( api.settingPreviewHandlers.custom_css );
911		} );
912
913		api.trigger( 'preview-ready' );
914	});
915
916})( wp, jQuery );
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