ru-se.com

theme.js (55671B)

---

 /**
  * @output wp-admin/js/theme.js
  */
 
 /* global _wpThemeSettings, confirm, tb_position */
 window.wp = window.wp || {};
 
 ( function($) {
 
 // Set up our namespace...
 var themes, l10n;
 themes = wp.themes = wp.themes || {};
 
 // Store the theme data and settings for organized and quick access.
 // themes.data.settings, themes.data.themes, themes.data.l10n.
 themes.data = _wpThemeSettings;
 l10n = themes.data.l10n;
 
 // Shortcut for isInstall check.
 themes.isInstall = !! themes.data.settings.isInstall;
 
 // Setup app structure.
 _.extend( themes, { model: {}, view: {}, routes: {}, router: {}, template: wp.template });
 
 themes.Model = Backbone.Model.extend({
 	// Adds attributes to the default data coming through the .org themes api.
 	// Map `id` to `slug` for shared code.
 	initialize: function() {
 		var description;
 
 		if ( this.get( 'slug' ) ) {
 			// If the theme is already installed, set an attribute.
 			if ( _.indexOf( themes.data.installedThemes, this.get( 'slug' ) ) !== -1 ) {
 				this.set({ installed: true });
 			}
 
 			// If the theme is active, set an attribute.
 			if ( themes.data.activeTheme === this.get( 'slug' ) ) {
 				this.set({ active: true });
 			}
 		}
 
 		// Set the attributes.
 		this.set({
 			// `slug` is for installation, `id` is for existing.
 			id: this.get( 'slug' ) || this.get( 'id' )
 		});
 
 		// Map `section.description` to `description`
 		// as the API sometimes returns it differently.
 		if ( this.has( 'sections' ) ) {
 			description = this.get( 'sections' ).description;
 			this.set({ description: description });
 		}
 	}
 });
 
 // Main view controller for themes.php.
 // Unifies and renders all available views.
 themes.view.Appearance = wp.Backbone.View.extend({
 
 	el: '#wpbody-content .wrap .theme-browser',
 
 	window: $( window ),
 	// Pagination instance.
 	page: 0,
 
 	// Sets up a throttler for binding to 'scroll'.
 	initialize: function( options ) {
 		// Scroller checks how far the scroll position is.
 		_.bindAll( this, 'scroller' );
 
 		this.SearchView = options.SearchView ? options.SearchView : themes.view.Search;
 		// Bind to the scroll event and throttle
 		// the results from this.scroller.
 		this.window.on( 'scroll', _.throttle( this.scroller, 300 ) );
 	},
 
 	// Main render control.
 	render: function() {
 		// Setup the main theme view
 		// with the current theme collection.
 		this.view = new themes.view.Themes({
 			collection: this.collection,
 			parent: this
 		});
 
 		// Render search form.
 		this.search();
 
 		this.$el.removeClass( 'search-loading' );
 
 		// Render and append.
 		this.view.render();
 		this.$el.empty().append( this.view.el ).addClass( 'rendered' );
 	},
 
 	// Defines search element container.
 	searchContainer: $( '.search-form' ),
 
 	// Search input and view
 	// for current theme collection.
 	search: function() {
 		var view,
 			self = this;
 
 		// Don't render the search if there is only one theme.
 		if ( themes.data.themes.length === 1 ) {
 			return;
 		}
 
 		view = new this.SearchView({
 			collection: self.collection,
 			parent: this
 		});
 		self.SearchView = view;
 
 		// Render and append after screen title.
 		view.render();
 		this.searchContainer
 			.append( $.parseHTML( '<label class="screen-reader-text" for="wp-filter-search-input">' + l10n.search + '</label>' ) )
 			.append( view.el )
 			.on( 'submit', function( event ) {
 				event.preventDefault();
 			});
 	},
 
 	// Checks when the user gets close to the bottom
 	// of the mage and triggers a theme:scroll event.
 	scroller: function() {
 		var self = this,
 			bottom, threshold;
 
 		bottom = this.window.scrollTop() + self.window.height();
 		threshold = self.$el.offset().top + self.$el.outerHeight( false ) - self.window.height();
 		threshold = Math.round( threshold * 0.9 );
 
 		if ( bottom > threshold ) {
 			this.trigger( 'theme:scroll' );
 		}
 	}
 });
 
 // Set up the Collection for our theme data.
 // @has 'id' 'name' 'screenshot' 'author' 'authorURI' 'version' 'active' ...
 themes.Collection = Backbone.Collection.extend({
 
 	model: themes.Model,
 
 	// Search terms.
 	terms: '',
 
 	// Controls searching on the current theme collection
 	// and triggers an update event.
 	doSearch: function( value ) {
 
 		// Don't do anything if we've already done this search.
 		// Useful because the Search handler fires multiple times per keystroke.
 		if ( this.terms === value ) {
 			return;
 		}
 
 		// Updates terms with the value passed.
 		this.terms = value;
 
 		// If we have terms, run a search...
 		if ( this.terms.length > 0 ) {
 			this.search( this.terms );
 		}
 
 		// If search is blank, show all themes.
 		// Useful for resetting the views when you clean the input.
 		if ( this.terms === '' ) {
 			this.reset( themes.data.themes );
 			$( 'body' ).removeClass( 'no-results' );
 		}
 
 		// Trigger a 'themes:update' event.
 		this.trigger( 'themes:update' );
 	},
 
 	/**
 	 * Performs a search within the collection.
 	 *
 	 * @uses RegExp
 	 */
 	search: function( term ) {
 		var match, results, haystack, name, description, author;
 
 		// Start with a full collection.
 		this.reset( themes.data.themes, { silent: true } );
 
 		// Trim the term.
 		term = term.trim();
 
 		// Escape the term string for RegExp meta characters.
 		term = term.replace( /[-\/\\^$*+?.()|[\]{}]/g, '\\$&' );
 
 		// Consider spaces as word delimiters and match the whole string
 		// so matching terms can be combined.
 		term = term.replace( / /g, ')(?=.*' );
 		match = new RegExp( '^(?=.*' + term + ').+', 'i' );
 
 		// Find results.
 		// _.filter() and .test().
 		results = this.filter( function( data ) {
 			name        = data.get( 'name' ).replace( /(<([^>]+)>)/ig, '' );
 			description = data.get( 'description' ).replace( /(<([^>]+)>)/ig, '' );
 			author      = data.get( 'author' ).replace( /(<([^>]+)>)/ig, '' );
 
 			haystack = _.union( [ name, data.get( 'id' ), description, author, data.get( 'tags' ) ] );
 
 			if ( match.test( data.get( 'author' ) ) && term.length > 2 ) {
 				data.set( 'displayAuthor', true );
 			}
 
 			return match.test( haystack );
 		});
 
 		if ( results.length === 0 ) {
 			this.trigger( 'query:empty' );
 		} else {
 			$( 'body' ).removeClass( 'no-results' );
 		}
 
 		this.reset( results );
 	},
 
 	// Paginates the collection with a helper method
 	// that slices the collection.
 	paginate: function( instance ) {
 		var collection = this;
 		instance = instance || 0;
 
 		// Themes per instance are set at 20.
 		collection = _( collection.rest( 20 * instance ) );
 		collection = _( collection.first( 20 ) );
 
 		return collection;
 	},
 
 	count: false,
 
 	/*
 	 * Handles requests for more themes and caches results.
 	 *
 	 *
 	 * When we are missing a cache object we fire an apiCall()
 	 * which triggers events of `query:success` or `query:fail`.
 	 */
 	query: function( request ) {
 		/**
 		 * @static
 		 * @type Array
 		 */
 		var queries = this.queries,
 			self = this,
 			query, isPaginated, count;
 
 		// Store current query request args
 		// for later use with the event `theme:end`.
 		this.currentQuery.request = request;
 
 		// Search the query cache for matches.
 		query = _.find( queries, function( query ) {
 			return _.isEqual( query.request, request );
 		});
 
 		// If the request matches the stored currentQuery.request
 		// it means we have a paginated request.
 		isPaginated = _.has( request, 'page' );
 
 		// Reset the internal api page counter for non-paginated queries.
 		if ( ! isPaginated ) {
 			this.currentQuery.page = 1;
 		}
 
 		// Otherwise, send a new API call and add it to the cache.
 		if ( ! query && ! isPaginated ) {
 			query = this.apiCall( request ).done( function( data ) {
 
 				// Update the collection with the queried data.
 				if ( data.themes ) {
 					self.reset( data.themes );
 					count = data.info.results;
 					// Store the results and the query request.
 					queries.push( { themes: data.themes, request: request, total: count } );
 				}
 
 				// Trigger a collection refresh event
 				// and a `query:success` event with a `count` argument.
 				self.trigger( 'themes:update' );
 				self.trigger( 'query:success', count );
 
 				if ( data.themes && data.themes.length === 0 ) {
 					self.trigger( 'query:empty' );
 				}
 
 			}).fail( function() {
 				self.trigger( 'query:fail' );
 			});
 		} else {
 			// If it's a paginated request we need to fetch more themes...
 			if ( isPaginated ) {
 				return this.apiCall( request, isPaginated ).done( function( data ) {
 					// Add the new themes to the current collection.
 					// @todo Update counter.
 					self.add( data.themes );
 					self.trigger( 'query:success' );
 
 					// We are done loading themes for now.
 					self.loadingThemes = false;
 
 				}).fail( function() {
 					self.trigger( 'query:fail' );
 				});
 			}
 
 			if ( query.themes.length === 0 ) {
 				self.trigger( 'query:empty' );
 			} else {
 				$( 'body' ).removeClass( 'no-results' );
 			}
 
 			// Only trigger an update event since we already have the themes
 			// on our cached object.
 			if ( _.isNumber( query.total ) ) {
 				this.count = query.total;
 			}
 
 			this.reset( query.themes );
 			if ( ! query.total ) {
 				this.count = this.length;
 			}
 
 			this.trigger( 'themes:update' );
 			this.trigger( 'query:success', this.count );
 		}
 	},
 
 	// Local cache array for API queries.
 	queries: [],
 
 	// Keep track of current query so we can handle pagination.
 	currentQuery: {
 		page: 1,
 		request: {}
 	},
 
 	// Send request to api.wordpress.org/themes.
 	apiCall: function( request, paginated ) {
 		return wp.ajax.send( 'query-themes', {
 			data: {
 				// Request data.
 				request: _.extend({
 					per_page: 100
 				}, request)
 			},
 
 			beforeSend: function() {
 				if ( ! paginated ) {
 					// Spin it.
 					$( 'body' ).addClass( 'loading-content' ).removeClass( 'no-results' );
 				}
 			}
 		});
 	},
 
 	// Static status controller for when we are loading themes.
 	loadingThemes: false
 });
 
 // This is the view that controls each theme item
 // that will be displayed on the screen.
 themes.view.Theme = wp.Backbone.View.extend({
 
 	// Wrap theme data on a div.theme element.
 	className: 'theme',
 
 	// Reflects which theme view we have.
 	// 'grid' (default) or 'detail'.
 	state: 'grid',
 
 	// The HTML template for each element to be rendered.
 	html: themes.template( 'theme' ),
 
 	events: {
 		'click': themes.isInstall ? 'preview': 'expand',
 		'keydown': themes.isInstall ? 'preview': 'expand',
 		'touchend': themes.isInstall ? 'preview': 'expand',
 		'keyup': 'addFocus',
 		'touchmove': 'preventExpand',
 		'click .theme-install': 'installTheme',
 		'click .update-message': 'updateTheme'
 	},
 
 	touchDrag: false,
 
 	initialize: function() {
 		this.model.on( 'change', this.render, this );
 	},
 
 	render: function() {
 		var data = this.model.toJSON();
 
 		// Render themes using the html template.
 		this.$el.html( this.html( data ) ).attr( 'data-slug', data.id );
 
 		// Renders active theme styles.
 		this.activeTheme();
 
 		if ( this.model.get( 'displayAuthor' ) ) {
 			this.$el.addClass( 'display-author' );
 		}
 	},
 
 	// Adds a class to the currently active theme
 	// and to the overlay in detailed view mode.
 	activeTheme: function() {
 		if ( this.model.get( 'active' ) ) {
 			this.$el.addClass( 'active' );
 		}
 	},
 
 	// Add class of focus to the theme we are focused on.
 	addFocus: function() {
 		var $themeToFocus = ( $( ':focus' ).hasClass( 'theme' ) ) ? $( ':focus' ) : $(':focus').parents('.theme');
 
 		$('.theme.focus').removeClass('focus');
 		$themeToFocus.addClass('focus');
 	},
 
 	// Single theme overlay screen.
 	// It's shown when clicking a theme.
 	expand: function( event ) {
 		var self = this;
 
 		event = event || window.event;
 
 		// 'Enter' and 'Space' keys expand the details view when a theme is :focused.
 		if ( event.type === 'keydown' && ( event.which !== 13 && event.which !== 32 ) ) {
 			return;
 		}
 
 		// Bail if the user scrolled on a touch device.
 		if ( this.touchDrag === true ) {
 			return this.touchDrag = false;
 		}
 
 		// Prevent the modal from showing when the user clicks
 		// one of the direct action buttons.
 		if ( $( event.target ).is( '.theme-actions a' ) ) {
 			return;
 		}
 
 		// Prevent the modal from showing when the user clicks one of the direct action buttons.
 		if ( $( event.target ).is( '.theme-actions a, .update-message, .button-link, .notice-dismiss' ) ) {
 			return;
 		}
 
 		// Set focused theme to current element.
 		themes.focusedTheme = this.$el;
 
 		this.trigger( 'theme:expand', self.model.cid );
 	},
 
 	preventExpand: function() {
 		this.touchDrag = true;
 	},
 
 	preview: function( event ) {
 		var self = this,
 			current, preview;
 
 		event = event || window.event;
 
 		// Bail if the user scrolled on a touch device.
 		if ( this.touchDrag === true ) {
 			return this.touchDrag = false;
 		}
 
 		// Allow direct link path to installing a theme.
 		if ( $( event.target ).not( '.install-theme-preview' ).parents( '.theme-actions' ).length ) {
 			return;
 		}
 
 		// 'Enter' and 'Space' keys expand the details view when a theme is :focused.
 		if ( event.type === 'keydown' && ( event.which !== 13 && event.which !== 32 ) ) {
 			return;
 		}
 
 		// Pressing Enter while focused on the buttons shouldn't open the preview.
 		if ( event.type === 'keydown' && event.which !== 13 && $( ':focus' ).hasClass( 'button' ) ) {
 			return;
 		}
 
 		event.preventDefault();
 
 		event = event || window.event;
 
 		// Set focus to current theme.
 		themes.focusedTheme = this.$el;
 
 		// Construct a new Preview view.
 		themes.preview = preview = new themes.view.Preview({
 			model: this.model
 		});
 
 		// Render the view and append it.
 		preview.render();
 		this.setNavButtonsState();
 
 		// Hide previous/next navigation if there is only one theme.
 		if ( this.model.collection.length === 1 ) {
 			preview.$el.addClass( 'no-navigation' );
 		} else {
 			preview.$el.removeClass( 'no-navigation' );
 		}
 
 		// Append preview.
 		$( 'div.wrap' ).append( preview.el );
 
 		// Listen to our preview object
 		// for `theme:next` and `theme:previous` events.
 		this.listenTo( preview, 'theme:next', function() {
 
 			// Keep local track of current theme model.
 			current = self.model;
 
 			// If we have ventured away from current model update the current model position.
 			if ( ! _.isUndefined( self.current ) ) {
 				current = self.current;
 			}
 
 			// Get next theme model.
 			self.current = self.model.collection.at( self.model.collection.indexOf( current ) + 1 );
 
 			// If we have no more themes, bail.
 			if ( _.isUndefined( self.current ) ) {
 				self.options.parent.parent.trigger( 'theme:end' );
 				return self.current = current;
 			}
 
 			preview.model = self.current;
 
 			// Render and append.
 			preview.render();
 			this.setNavButtonsState();
 			$( '.next-theme' ).trigger( 'focus' );
 		})
 		.listenTo( preview, 'theme:previous', function() {
 
 			// Keep track of current theme model.
 			current = self.model;
 
 			// Bail early if we are at the beginning of the collection.
 			if ( self.model.collection.indexOf( self.current ) === 0 ) {
 				return;
 			}
 
 			// If we have ventured away from current model update the current model position.
 			if ( ! _.isUndefined( self.current ) ) {
 				current = self.current;
 			}
 
 			// Get previous theme model.
 			self.current = self.model.collection.at( self.model.collection.indexOf( current ) - 1 );
 
 			// If we have no more themes, bail.
 			if ( _.isUndefined( self.current ) ) {
 				return;
 			}
 
 			preview.model = self.current;
 
 			// Render and append.
 			preview.render();
 			this.setNavButtonsState();
 			$( '.previous-theme' ).trigger( 'focus' );
 		});
 
 		this.listenTo( preview, 'preview:close', function() {
 			self.current = self.model;
 		});
 
 	},
 
 	// Handles .disabled classes for previous/next buttons in theme installer preview.
 	setNavButtonsState: function() {
 		var $themeInstaller = $( '.theme-install-overlay' ),
 			current = _.isUndefined( this.current ) ? this.model : this.current,
 			previousThemeButton = $themeInstaller.find( '.previous-theme' ),
 			nextThemeButton = $themeInstaller.find( '.next-theme' );
 
 		// Disable previous at the zero position.
 		if ( 0 === this.model.collection.indexOf( current ) ) {
 			previousThemeButton
 				.addClass( 'disabled' )
 				.prop( 'disabled', true );
 
 			nextThemeButton.trigger( 'focus' );
 		}
 
 		// Disable next if the next model is undefined.
 		if ( _.isUndefined( this.model.collection.at( this.model.collection.indexOf( current ) + 1 ) ) ) {
 			nextThemeButton
 				.addClass( 'disabled' )
 				.prop( 'disabled', true );
 
 			previousThemeButton.trigger( 'focus' );
 		}
 	},
 
 	installTheme: function( event ) {
 		var _this = this;
 
 		event.preventDefault();
 
 		wp.updates.maybeRequestFilesystemCredentials( event );
 
 		$( document ).on( 'wp-theme-install-success', function( event, response ) {
 			if ( _this.model.get( 'id' ) === response.slug ) {
 				_this.model.set( { 'installed': true } );
 			}
 		} );
 
 		wp.updates.installTheme( {
 			slug: $( event.target ).data( 'slug' )
 		} );
 	},
 
 	updateTheme: function( event ) {
 		var _this = this;
 
 		if ( ! this.model.get( 'hasPackage' ) ) {
 			return;
 		}
 
 		event.preventDefault();
 
 		wp.updates.maybeRequestFilesystemCredentials( event );
 
 		$( document ).on( 'wp-theme-update-success', function( event, response ) {
 			_this.model.off( 'change', _this.render, _this );
 			if ( _this.model.get( 'id' ) === response.slug ) {
 				_this.model.set( {
 					hasUpdate: false,
 					version: response.newVersion
 				} );
 			}
 			_this.model.on( 'change', _this.render, _this );
 		} );
 
 		wp.updates.updateTheme( {
 			slug: $( event.target ).parents( 'div.theme' ).first().data( 'slug' )
 		} );
 	}
 });
 
 // Theme Details view.
 // Sets up a modal overlay with the expanded theme data.
 themes.view.Details = wp.Backbone.View.extend({
 
 	// Wrap theme data on a div.theme element.
 	className: 'theme-overlay',
 
 	events: {
 		'click': 'collapse',
 		'click .delete-theme': 'deleteTheme',
 		'click .left': 'previousTheme',
 		'click .right': 'nextTheme',
 		'click #update-theme': 'updateTheme',
 		'click .toggle-auto-update': 'autoupdateState'
 	},
 
 	// The HTML template for the theme overlay.
 	html: themes.template( 'theme-single' ),
 
 	render: function() {
 		var data = this.model.toJSON();
 		this.$el.html( this.html( data ) );
 		// Renders active theme styles.
 		this.activeTheme();
 		// Set up navigation events.
 		this.navigation();
 		// Checks screenshot size.
 		this.screenshotCheck( this.$el );
 		// Contain "tabbing" inside the overlay.
 		this.containFocus( this.$el );
 	},
 
 	// Adds a class to the currently active theme
 	// and to the overlay in detailed view mode.
 	activeTheme: function() {
 		// Check the model has the active property.
 		this.$el.toggleClass( 'active', this.model.get( 'active' ) );
 	},
 
 	// Set initial focus and constrain tabbing within the theme browser modal.
 	containFocus: function( $el ) {
 
 		// Set initial focus on the primary action control.
 		_.delay( function() {
 			$( '.theme-overlay' ).trigger( 'focus' );
 		}, 100 );
 
 		// Constrain tabbing within the modal.
 		$el.on( 'keydown.wp-themes', function( event ) {
 			var $firstFocusable = $el.find( '.theme-header button:not(.disabled)' ).first(),
 				$lastFocusable = $el.find( '.theme-actions a:visible' ).last();
 
 			// Check for the Tab key.
 			if ( 9 === event.which ) {
 				if ( $firstFocusable[0] === event.target && event.shiftKey ) {
 					$lastFocusable.trigger( 'focus' );
 					event.preventDefault();
 				} else if ( $lastFocusable[0] === event.target && ! event.shiftKey ) {
 					$firstFocusable.trigger( 'focus' );
 					event.preventDefault();
 				}
 			}
 		});
 	},
 
 	// Single theme overlay screen.
 	// It's shown when clicking a theme.
 	collapse: function( event ) {
 		var self = this,
 			scroll;
 
 		event = event || window.event;
 
 		// Prevent collapsing detailed view when there is only one theme available.
 		if ( themes.data.themes.length === 1 ) {
 			return;
 		}
 
 		// Detect if the click is inside the overlay and don't close it
 		// unless the target was the div.back button.
 		if ( $( event.target ).is( '.theme-backdrop' ) || $( event.target ).is( '.close' ) || event.keyCode === 27 ) {
 
 			// Add a temporary closing class while overlay fades out.
 			$( 'body' ).addClass( 'closing-overlay' );
 
 			// With a quick fade out animation.
 			this.$el.fadeOut( 130, function() {
 				// Clicking outside the modal box closes the overlay.
 				$( 'body' ).removeClass( 'closing-overlay' );
 				// Handle event cleanup.
 				self.closeOverlay();
 
 				// Get scroll position to avoid jumping to the top.
 				scroll = document.body.scrollTop;
 
 				// Clean the URL structure.
 				themes.router.navigate( themes.router.baseUrl( '' ) );
 
 				// Restore scroll position.
 				document.body.scrollTop = scroll;
 
 				// Return focus to the theme div.
 				if ( themes.focusedTheme ) {
 					themes.focusedTheme.find('.more-details').trigger( 'focus' );
 				}
 			});
 		}
 	},
 
 	// Handles .disabled classes for next/previous buttons.
 	navigation: function() {
 
 		// Disable Left/Right when at the start or end of the collection.
 		if ( this.model.cid === this.model.collection.at(0).cid ) {
 			this.$el.find( '.left' )
 				.addClass( 'disabled' )
 				.prop( 'disabled', true );
 		}
 		if ( this.model.cid === this.model.collection.at( this.model.collection.length - 1 ).cid ) {
 			this.$el.find( '.right' )
 				.addClass( 'disabled' )
 				.prop( 'disabled', true );
 		}
 	},
 
 	// Performs the actions to effectively close
 	// the theme details overlay.
 	closeOverlay: function() {
 		$( 'body' ).removeClass( 'modal-open' );
 		this.remove();
 		this.unbind();
 		this.trigger( 'theme:collapse' );
 	},
 
 	// Set state of the auto-update settings link after it has been changed and saved.
 	autoupdateState: function() {
 		var callback,
 			_this = this;
 
 		// Support concurrent clicks in different Theme Details overlays.
 		callback = function( event, data ) {
 			var autoupdate;
 			if ( _this.model.get( 'id' ) === data.asset ) {
 				autoupdate = _this.model.get( 'autoupdate' );
 				autoupdate.enabled = 'enable' === data.state;
 				_this.model.set( { autoupdate: autoupdate } );
 				$( document ).off( 'wp-auto-update-setting-changed', callback );
 			}
 		};
 
 		// Triggered in updates.js
 		$( document ).on( 'wp-auto-update-setting-changed', callback );
 	},
 
 	updateTheme: function( event ) {
 		var _this = this;
 		event.preventDefault();
 
 		wp.updates.maybeRequestFilesystemCredentials( event );
 
 		$( document ).on( 'wp-theme-update-success', function( event, response ) {
 			if ( _this.model.get( 'id' ) === response.slug ) {
 				_this.model.set( {
 					hasUpdate: false,
 					version: response.newVersion
 				} );
 			}
 			_this.render();
 		} );
 
 		wp.updates.updateTheme( {
 			slug: $( event.target ).data( 'slug' )
 		} );
 	},
 
 	deleteTheme: function( event ) {
 		var _this = this,
 		    _collection = _this.model.collection,
 		    _themes = themes;
 		event.preventDefault();
 
 		// Confirmation dialog for deleting a theme.
 		if ( ! window.confirm( wp.themes.data.settings.confirmDelete ) ) {
 			return;
 		}
 
 		wp.updates.maybeRequestFilesystemCredentials( event );
 
 		$( document ).one( 'wp-theme-delete-success', function( event, response ) {
 			_this.$el.find( '.close' ).trigger( 'click' );
 			$( '[data-slug="' + response.slug + '"]' ).css( { backgroundColor:'#faafaa' } ).fadeOut( 350, function() {
 				$( this ).remove();
 				_themes.data.themes = _.without( _themes.data.themes, _.findWhere( _themes.data.themes, { id: response.slug } ) );
 
 				$( '.wp-filter-search' ).val( '' );
 				_collection.doSearch( '' );
 				_collection.remove( _this.model );
 				_collection.trigger( 'themes:update' );
 			} );
 		} );
 
 		wp.updates.deleteTheme( {
 			slug: this.model.get( 'id' )
 		} );
 	},
 
 	nextTheme: function() {
 		var self = this;
 		self.trigger( 'theme:next', self.model.cid );
 		return false;
 	},
 
 	previousTheme: function() {
 		var self = this;
 		self.trigger( 'theme:previous', self.model.cid );
 		return false;
 	},
 
 	// Checks if the theme screenshot is the old 300px width version
 	// and adds a corresponding class if it's true.
 	screenshotCheck: function( el ) {
 		var screenshot, image;
 
 		screenshot = el.find( '.screenshot img' );
 		image = new Image();
 		image.src = screenshot.attr( 'src' );
 
 		// Width check.
 		if ( image.width && image.width <= 300 ) {
 			el.addClass( 'small-screenshot' );
 		}
 	}
 });
 
 // Theme Preview view.
 // Sets up a modal overlay with the expanded theme data.
 themes.view.Preview = themes.view.Details.extend({
 
 	className: 'wp-full-overlay expanded',
 	el: '.theme-install-overlay',
 
 	events: {
 		'click .close-full-overlay': 'close',
 		'click .collapse-sidebar': 'collapse',
 		'click .devices button': 'previewDevice',
 		'click .previous-theme': 'previousTheme',
 		'click .next-theme': 'nextTheme',
 		'keyup': 'keyEvent',
 		'click .theme-install': 'installTheme'
 	},
 
 	// The HTML template for the theme preview.
 	html: themes.template( 'theme-preview' ),
 
 	render: function() {
 		var self = this,
 			currentPreviewDevice,
 			data = this.model.toJSON(),
 			$body = $( document.body );
 
 		$body.attr( 'aria-busy', 'true' );
 
 		this.$el.removeClass( 'iframe-ready' ).html( this.html( data ) );
 
 		currentPreviewDevice = this.$el.data( 'current-preview-device' );
 		if ( currentPreviewDevice ) {
 			self.tooglePreviewDeviceButtons( currentPreviewDevice );
 		}
 
 		themes.router.navigate( themes.router.baseUrl( themes.router.themePath + this.model.get( 'id' ) ), { replace: false } );
 
 		this.$el.fadeIn( 200, function() {
 			$body.addClass( 'theme-installer-active full-overlay-active' );
 		});
 
 		this.$el.find( 'iframe' ).one( 'load', function() {
 			self.iframeLoaded();
 		});
 	},
 
 	iframeLoaded: function() {
 		this.$el.addClass( 'iframe-ready' );
 		$( document.body ).attr( 'aria-busy', 'false' );
 	},
 
 	close: function() {
 		this.$el.fadeOut( 200, function() {
 			$( 'body' ).removeClass( 'theme-installer-active full-overlay-active' );
 
 			// Return focus to the theme div.
 			if ( themes.focusedTheme ) {
 				themes.focusedTheme.find('.more-details').trigger( 'focus' );
 			}
 		}).removeClass( 'iframe-ready' );
 
 		// Restore the previous browse tab if available.
 		if ( themes.router.selectedTab ) {
 			themes.router.navigate( themes.router.baseUrl( '?browse=' + themes.router.selectedTab ) );
 			themes.router.selectedTab = false;
 		} else {
 			themes.router.navigate( themes.router.baseUrl( '' ) );
 		}
 		this.trigger( 'preview:close' );
 		this.undelegateEvents();
 		this.unbind();
 		return false;
 	},
 
 	collapse: function( event ) {
 		var $button = $( event.currentTarget );
 		if ( 'true' === $button.attr( 'aria-expanded' ) ) {
 			$button.attr({ 'aria-expanded': 'false', 'aria-label': l10n.expandSidebar });
 		} else {
 			$button.attr({ 'aria-expanded': 'true', 'aria-label': l10n.collapseSidebar });
 		}
 
 		this.$el.toggleClass( 'collapsed' ).toggleClass( 'expanded' );
 		return false;
 	},
 
 	previewDevice: function( event ) {
 		var device = $( event.currentTarget ).data( 'device' );
 
 		this.$el
 			.removeClass( 'preview-desktop preview-tablet preview-mobile' )
 			.addClass( 'preview-' + device )
 			.data( 'current-preview-device', device );
 
 		this.tooglePreviewDeviceButtons( device );
 	},
 
 	tooglePreviewDeviceButtons: function( newDevice ) {
 		var $devices = $( '.wp-full-overlay-footer .devices' );
 
 		$devices.find( 'button' )
 			.removeClass( 'active' )
 			.attr( 'aria-pressed', false );
 
 		$devices.find( 'button.preview-' + newDevice )
 			.addClass( 'active' )
 			.attr( 'aria-pressed', true );
 	},
 
 	keyEvent: function( event ) {
 		// The escape key closes the preview.
 		if ( event.keyCode === 27 ) {
 			this.undelegateEvents();
 			this.close();
 		}
 		// The right arrow key, next theme.
 		if ( event.keyCode === 39 ) {
 			_.once( this.nextTheme() );
 		}
 
 		// The left arrow key, previous theme.
 		if ( event.keyCode === 37 ) {
 			this.previousTheme();
 		}
 	},
 
 	installTheme: function( event ) {
 		var _this   = this,
 		    $target = $( event.target );
 		event.preventDefault();
 
 		if ( $target.hasClass( 'disabled' ) ) {
 			return;
 		}
 
 		wp.updates.maybeRequestFilesystemCredentials( event );
 
 		$( document ).on( 'wp-theme-install-success', function() {
 			_this.model.set( { 'installed': true } );
 		} );
 
 		wp.updates.installTheme( {
 			slug: $target.data( 'slug' )
 		} );
 	}
 });
 
 // Controls the rendering of div.themes,
 // a wrapper that will hold all the theme elements.
 themes.view.Themes = wp.Backbone.View.extend({
 
 	className: 'themes wp-clearfix',
 	$overlay: $( 'div.theme-overlay' ),
 
 	// Number to keep track of scroll position
 	// while in theme-overlay mode.
 	index: 0,
 
 	// The theme count element.
 	count: $( '.wrap .theme-count' ),
 
 	// The live themes count.
 	liveThemeCount: 0,
 
 	initialize: function( options ) {
 		var self = this;
 
 		// Set up parent.
 		this.parent = options.parent;
 
 		// Set current view to [grid].
 		this.setView( 'grid' );
 
 		// Move the active theme to the beginning of the collection.
 		self.currentTheme();
 
 		// When the collection is updated by user input...
 		this.listenTo( self.collection, 'themes:update', function() {
 			self.parent.page = 0;
 			self.currentTheme();
 			self.render( this );
 		} );
 
 		// Update theme count to full result set when available.
 		this.listenTo( self.collection, 'query:success', function( count ) {
 			if ( _.isNumber( count ) ) {
 				self.count.text( count );
 				self.announceSearchResults( count );
 			} else {
 				self.count.text( self.collection.length );
 				self.announceSearchResults( self.collection.length );
 			}
 		});
 
 		this.listenTo( self.collection, 'query:empty', function() {
 			$( 'body' ).addClass( 'no-results' );
 		});
 
 		this.listenTo( this.parent, 'theme:scroll', function() {
 			self.renderThemes( self.parent.page );
 		});
 
 		this.listenTo( this.parent, 'theme:close', function() {
 			if ( self.overlay ) {
 				self.overlay.closeOverlay();
 			}
 		} );
 
 		// Bind keyboard events.
 		$( 'body' ).on( 'keyup', function( event ) {
 			if ( ! self.overlay ) {
 				return;
 			}
 
 			// Bail if the filesystem credentials dialog is shown.
 			if ( $( '#request-filesystem-credentials-dialog' ).is( ':visible' ) ) {
 				return;
 			}
 
 			// Pressing the right arrow key fires a theme:next event.
 			if ( event.keyCode === 39 ) {
 				self.overlay.nextTheme();
 			}
 
 			// Pressing the left arrow key fires a theme:previous event.
 			if ( event.keyCode === 37 ) {
 				self.overlay.previousTheme();
 			}
 
 			// Pressing the escape key fires a theme:collapse event.
 			if ( event.keyCode === 27 ) {
 				self.overlay.collapse( event );
 			}
 		});
 	},
 
 	// Manages rendering of theme pages
 	// and keeping theme count in sync.
 	render: function() {
 		// Clear the DOM, please.
 		this.$el.empty();
 
 		// If the user doesn't have switch capabilities or there is only one theme
 		// in the collection, render the detailed view of the active theme.
 		if ( themes.data.themes.length === 1 ) {
 
 			// Constructs the view.
 			this.singleTheme = new themes.view.Details({
 				model: this.collection.models[0]
 			});
 
 			// Render and apply a 'single-theme' class to our container.
 			this.singleTheme.render();
 			this.$el.addClass( 'single-theme' );
 			this.$el.append( this.singleTheme.el );
 		}
 
 		// Generate the themes using page instance
 		// while checking the collection has items.
 		if ( this.options.collection.size() > 0 ) {
 			this.renderThemes( this.parent.page );
 		}
 
 		// Display a live theme count for the collection.
 		this.liveThemeCount = this.collection.count ? this.collection.count : this.collection.length;
 		this.count.text( this.liveThemeCount );
 
 		/*
 		 * In the theme installer the themes count is already announced
 		 * because `announceSearchResults` is called on `query:success`.
 		 */
 		if ( ! themes.isInstall ) {
 			this.announceSearchResults( this.liveThemeCount );
 		}
 	},
 
 	// Iterates through each instance of the collection
 	// and renders each theme module.
 	renderThemes: function( page ) {
 		var self = this;
 
 		self.instance = self.collection.paginate( page );
 
 		// If we have no more themes, bail.
 		if ( self.instance.size() === 0 ) {
 			// Fire a no-more-themes event.
 			this.parent.trigger( 'theme:end' );
 			return;
 		}
 
 		// Make sure the add-new stays at the end.
 		if ( ! themes.isInstall && page >= 1 ) {
 			$( '.add-new-theme' ).remove();
 		}
 
 		// Loop through the themes and setup each theme view.
 		self.instance.each( function( theme ) {
 			self.theme = new themes.view.Theme({
 				model: theme,
 				parent: self
 			});
 
 			// Render the views...
 			self.theme.render();
 			// ...and append them to div.themes.
 			self.$el.append( self.theme.el );
 
 			// Binds to theme:expand to show the modal box
 			// with the theme details.
 			self.listenTo( self.theme, 'theme:expand', self.expand, self );
 		});
 
 		// 'Add new theme' element shown at the end of the grid.
 		if ( ! themes.isInstall && themes.data.settings.canInstall ) {
 			this.$el.append( '<div class="theme add-new-theme"><a href="' + themes.data.settings.installURI + '"><div class="theme-screenshot"><span></span></div><h2 class="theme-name">' + l10n.addNew + '</h2></a></div>' );
 		}
 
 		this.parent.page++;
 	},
 
 	// Grabs current theme and puts it at the beginning of the collection.
 	currentTheme: function() {
 		var self = this,
 			current;
 
 		current = self.collection.findWhere({ active: true });
 
 		// Move the active theme to the beginning of the collection.
 		if ( current ) {
 			self.collection.remove( current );
 			self.collection.add( current, { at:0 } );
 		}
 	},
 
 	// Sets current view.
 	setView: function( view ) {
 		return view;
 	},
 
 	// Renders the overlay with the ThemeDetails view.
 	// Uses the current model data.
 	expand: function( id ) {
 		var self = this, $card, $modal;
 
 		// Set the current theme model.
 		this.model = self.collection.get( id );
 
 		// Trigger a route update for the current model.
 		themes.router.navigate( themes.router.baseUrl( themes.router.themePath + this.model.id ) );
 
 		// Sets this.view to 'detail'.
 		this.setView( 'detail' );
 		$( 'body' ).addClass( 'modal-open' );
 
 		// Set up the theme details view.
 		this.overlay = new themes.view.Details({
 			model: self.model
 		});
 
 		this.overlay.render();
 
 		if ( this.model.get( 'hasUpdate' ) ) {
 			$card  = $( '[data-slug="' + this.model.id + '"]' );
 			$modal = $( this.overlay.el );
 
 			if ( $card.find( '.updating-message' ).length ) {
 				$modal.find( '.notice-warning h3' ).remove();
 				$modal.find( '.notice-warning' )
 					.removeClass( 'notice-large' )
 					.addClass( 'updating-message' )
 					.find( 'p' ).text( wp.updates.l10n.updating );
 			} else if ( $card.find( '.notice-error' ).length ) {
 				$modal.find( '.notice-warning' ).remove();
 			}
 		}
 
 		this.$overlay.html( this.overlay.el );
 
 		// Bind to theme:next and theme:previous triggered by the arrow keys.
 		// Keep track of the current model so we can infer an index position.
 		this.listenTo( this.overlay, 'theme:next', function() {
 			// Renders the next theme on the overlay.
 			self.next( [ self.model.cid ] );
 
 		})
 		.listenTo( this.overlay, 'theme:previous', function() {
 			// Renders the previous theme on the overlay.
 			self.previous( [ self.model.cid ] );
 		});
 	},
 
 	/*
 	 * This method renders the next theme on the overlay modal
 	 * based on the current position in the collection.
 	 *
 	 * @params [model cid]
 	 */
 	next: function( args ) {
 		var self = this,
 			model, nextModel;
 
 		// Get the current theme.
 		model = self.collection.get( args[0] );
 		// Find the next model within the collection.
 		nextModel = self.collection.at( self.collection.indexOf( model ) + 1 );
 
 		// Sanity check which also serves as a boundary test.
 		if ( nextModel !== undefined ) {
 
 			// We have a new theme...
 			// Close the overlay.
 			this.overlay.closeOverlay();
 
 			// Trigger a route update for the current model.
 			self.theme.trigger( 'theme:expand', nextModel.cid );
 
 		}
 	},
 
 	/*
 	 * This method renders the previous theme on the overlay modal
 	 * based on the current position in the collection.
 	 *
 	 * @params [model cid]
 	 */
 	previous: function( args ) {
 		var self = this,
 			model, previousModel;
 
 		// Get the current theme.
 		model = self.collection.get( args[0] );
 		// Find the previous model within the collection.
 		previousModel = self.collection.at( self.collection.indexOf( model ) - 1 );
 
 		if ( previousModel !== undefined ) {
 
 			// We have a new theme...
 			// Close the overlay.
 			this.overlay.closeOverlay();
 
 			// Trigger a route update for the current model.
 			self.theme.trigger( 'theme:expand', previousModel.cid );
 
 		}
 	},
 
 	// Dispatch audible search results feedback message.
 	announceSearchResults: function( count ) {
 		if ( 0 === count ) {
 			wp.a11y.speak( l10n.noThemesFound );
 		} else {
 			wp.a11y.speak( l10n.themesFound.replace( '%d', count ) );
 		}
 	}
 });
 
 // Search input view controller.
 themes.view.Search = wp.Backbone.View.extend({
 
 	tagName: 'input',
 	className: 'wp-filter-search',
 	id: 'wp-filter-search-input',
 	searching: false,
 
 	attributes: {
 		placeholder: l10n.searchPlaceholder,
 		type: 'search',
 		'aria-describedby': 'live-search-desc'
 	},
 
 	events: {
 		'input': 'search',
 		'keyup': 'search',
 		'blur': 'pushState'
 	},
 
 	initialize: function( options ) {
 
 		this.parent = options.parent;
 
 		this.listenTo( this.parent, 'theme:close', function() {
 			this.searching = false;
 		} );
 
 	},
 
 	search: function( event ) {
 		// Clear on escape.
 		if ( event.type === 'keyup' && event.which === 27 ) {
 			event.target.value = '';
 		}
 
 		// Since doSearch is debounced, it will only run when user input comes to a rest.
 		this.doSearch( event );
 	},
 
 	// Runs a search on the theme collection.
 	doSearch: function( event ) {
 		var options = {};
 
 		this.collection.doSearch( event.target.value.replace( /\+/g, ' ' ) );
 
 		// if search is initiated and key is not return.
 		if ( this.searching && event.which !== 13 ) {
 			options.replace = true;
 		} else {
 			this.searching = true;
 		}
 
 		// Update the URL hash.
 		if ( event.target.value ) {
 			themes.router.navigate( themes.router.baseUrl( themes.router.searchPath + event.target.value ), options );
 		} else {
 			themes.router.navigate( themes.router.baseUrl( '' ) );
 		}
 	},
 
 	pushState: function( event ) {
 		var url = themes.router.baseUrl( '' );
 
 		if ( event.target.value ) {
 			url = themes.router.baseUrl( themes.router.searchPath + encodeURIComponent( event.target.value ) );
 		}
 
 		this.searching = false;
 		themes.router.navigate( url );
 
 	}
 });
 
 /**
  * Navigate router.
  *
  * @since 4.9.0
  *
  * @param {string} url - URL to navigate to.
  * @param {Object} state - State.
  * @return {void}
  */
 function navigateRouter( url, state ) {
 	var router = this;
 	if ( Backbone.history._hasPushState ) {
 		Backbone.Router.prototype.navigate.call( router, url, state );
 	}
 }
 
 // Sets up the routes events for relevant url queries.
 // Listens to [theme] and [search] params.
 themes.Router = Backbone.Router.extend({
 
 	routes: {
 		'themes.php?theme=:slug': 'theme',
 		'themes.php?search=:query': 'search',
 		'themes.php?s=:query': 'search',
 		'themes.php': 'themes',
 		'': 'themes'
 	},
 
 	baseUrl: function( url ) {
 		return 'themes.php' + url;
 	},
 
 	themePath: '?theme=',
 	searchPath: '?search=',
 
 	search: function( query ) {
 		$( '.wp-filter-search' ).val( query.replace( /\+/g, ' ' ) );
 	},
 
 	themes: function() {
 		$( '.wp-filter-search' ).val( '' );
 	},
 
 	navigate: navigateRouter
 
 });
 
 // Execute and setup the application.
 themes.Run = {
 	init: function() {
 		// Initializes the blog's theme library view.
 		// Create a new collection with data.
 		this.themes = new themes.Collection( themes.data.themes );
 
 		// Set up the view.
 		this.view = new themes.view.Appearance({
 			collection: this.themes
 		});
 
 		this.render();
 
 		// Start debouncing user searches after Backbone.history.start().
 		this.view.SearchView.doSearch = _.debounce( this.view.SearchView.doSearch, 500 );
 	},
 
 	render: function() {
 
 		// Render results.
 		this.view.render();
 		this.routes();
 
 		if ( Backbone.History.started ) {
 			Backbone.history.stop();
 		}
 		Backbone.history.start({
 			root: themes.data.settings.adminUrl,
 			pushState: true,
 			hashChange: false
 		});
 	},
 
 	routes: function() {
 		var self = this;
 		// Bind to our global thx object
 		// so that the object is available to sub-views.
 		themes.router = new themes.Router();
 
 		// Handles theme details route event.
 		themes.router.on( 'route:theme', function( slug ) {
 			self.view.view.expand( slug );
 		});
 
 		themes.router.on( 'route:themes', function() {
 			self.themes.doSearch( '' );
 			self.view.trigger( 'theme:close' );
 		});
 
 		// Handles search route event.
 		themes.router.on( 'route:search', function() {
 			$( '.wp-filter-search' ).trigger( 'keyup' );
 		});
 
 		this.extraRoutes();
 	},
 
 	extraRoutes: function() {
 		return false;
 	}
 };
 
 // Extend the main Search view.
 themes.view.InstallerSearch =  themes.view.Search.extend({
 
 	events: {
 		'input': 'search',
 		'keyup': 'search'
 	},
 
 	terms: '',
 
 	// Handles Ajax request for searching through themes in public repo.
 	search: function( event ) {
 
 		// Tabbing or reverse tabbing into the search input shouldn't trigger a search.
 		if ( event.type === 'keyup' && ( event.which === 9 || event.which === 16 ) ) {
 			return;
 		}
 
 		this.collection = this.options.parent.view.collection;
 
 		// Clear on escape.
 		if ( event.type === 'keyup' && event.which === 27 ) {
 			event.target.value = '';
 		}
 
 		this.doSearch( event.target.value );
 	},
 
 	doSearch: function( value ) {
 		var request = {};
 
 		// Don't do anything if the search terms haven't changed.
 		if ( this.terms === value ) {
 			return;
 		}
 
 		// Updates terms with the value passed.
 		this.terms = value;
 
 		request.search = value;
 
 		/*
 		 * Intercept an [author] search.
 		 *
 		 * If input value starts with `author:` send a request
 		 * for `author` instead of a regular `search`.
 		 */
 		if ( value.substring( 0, 7 ) === 'author:' ) {
 			request.search = '';
 			request.author = value.slice( 7 );
 		}
 
 		/*
 		 * Intercept a [tag] search.
 		 *
 		 * If input value starts with `tag:` send a request
 		 * for `tag` instead of a regular `search`.
 		 */
 		if ( value.substring( 0, 4 ) === 'tag:' ) {
 			request.search = '';
 			request.tag = [ value.slice( 4 ) ];
 		}
 
 		$( '.filter-links li > a.current' )
 			.removeClass( 'current' )
 			.removeAttr( 'aria-current' );
 
 		$( 'body' ).removeClass( 'show-filters filters-applied show-favorites-form' );
 		$( '.drawer-toggle' ).attr( 'aria-expanded', 'false' );
 
 		// Get the themes by sending Ajax POST request to api.wordpress.org/themes
 		// or searching the local cache.
 		this.collection.query( request );
 
 		// Set route.
 		themes.router.navigate( themes.router.baseUrl( themes.router.searchPath + encodeURIComponent( value ) ), { replace: true } );
 	}
 });
 
 themes.view.Installer = themes.view.Appearance.extend({
 
 	el: '#wpbody-content .wrap',
 
 	// Register events for sorting and filters in theme-navigation.
 	events: {
 		'click .filter-links li > a': 'onSort',
 		'click .theme-filter': 'onFilter',
 		'click .drawer-toggle': 'moreFilters',
 		'click .filter-drawer .apply-filters': 'applyFilters',
 		'click .filter-group [type="checkbox"]': 'addFilter',
 		'click .filter-drawer .clear-filters': 'clearFilters',
 		'click .edit-filters': 'backToFilters',
 		'click .favorites-form-submit' : 'saveUsername',
 		'keyup #wporg-username-input': 'saveUsername'
 	},
 
 	// Initial render method.
 	render: function() {
 		var self = this;
 
 		this.search();
 		this.uploader();
 
 		this.collection = new themes.Collection();
 
 		// Bump `collection.currentQuery.page` and request more themes if we hit the end of the page.
 		this.listenTo( this, 'theme:end', function() {
 
 			// Make sure we are not already loading.
 			if ( self.collection.loadingThemes ) {
 				return;
 			}
 
 			// Set loadingThemes to true and bump page instance of currentQuery.
 			self.collection.loadingThemes = true;
 			self.collection.currentQuery.page++;
 
 			// Use currentQuery.page to build the themes request.
 			_.extend( self.collection.currentQuery.request, { page: self.collection.currentQuery.page } );
 			self.collection.query( self.collection.currentQuery.request );
 		});
 
 		this.listenTo( this.collection, 'query:success', function() {
 			$( 'body' ).removeClass( 'loading-content' );
 			$( '.theme-browser' ).find( 'div.error' ).remove();
 		});
 
 		this.listenTo( this.collection, 'query:fail', function() {
 			$( 'body' ).removeClass( 'loading-content' );
 			$( '.theme-browser' ).find( 'div.error' ).remove();
 			$( '.theme-browser' ).find( 'div.themes' ).before( '<div class="error"><p>' + l10n.error + '</p><p><button class="button try-again">' + l10n.tryAgain + '</button></p></div>' );
 			$( '.theme-browser .error .try-again' ).on( 'click', function( e ) {
 				e.preventDefault();
 				$( 'input.wp-filter-search' ).trigger( 'input' );
 			} );
 		});
 
 		if ( this.view ) {
 			this.view.remove();
 		}
 
 		// Sets up the view and passes the section argument.
 		this.view = new themes.view.Themes({
 			collection: this.collection,
 			parent: this
 		});
 
 		// Reset pagination every time the install view handler is run.
 		this.page = 0;
 
 		// Render and append.
 		this.$el.find( '.themes' ).remove();
 		this.view.render();
 		this.$el.find( '.theme-browser' ).append( this.view.el ).addClass( 'rendered' );
 	},
 
 	// Handles all the rendering of the public theme directory.
 	browse: function( section ) {
 		// Create a new collection with the proper theme data
 		// for each section.
 		this.collection.query( { browse: section } );
 	},
 
 	// Sorting navigation.
 	onSort: function( event ) {
 		var $el = $( event.target ),
 			sort = $el.data( 'sort' );
 
 		event.preventDefault();
 
 		$( 'body' ).removeClass( 'filters-applied show-filters' );
 		$( '.drawer-toggle' ).attr( 'aria-expanded', 'false' );
 
 		// Bail if this is already active.
 		if ( $el.hasClass( this.activeClass ) ) {
 			return;
 		}
 
 		this.sort( sort );
 
 		// Trigger a router.navigate update.
 		themes.router.navigate( themes.router.baseUrl( themes.router.browsePath + sort ) );
 	},
 
 	sort: function( sort ) {
 		this.clearSearch();
 
 		// Track sorting so we can restore the correct tab when closing preview.
 		themes.router.selectedTab = sort;
 
 		$( '.filter-links li > a, .theme-filter' )
 			.removeClass( this.activeClass )
 			.removeAttr( 'aria-current' );
 
 		$( '[data-sort="' + sort + '"]' )
 			.addClass( this.activeClass )
 			.attr( 'aria-current', 'page' );
 
 		if ( 'favorites' === sort ) {
 			$( 'body' ).addClass( 'show-favorites-form' );
 		} else {
 			$( 'body' ).removeClass( 'show-favorites-form' );
 		}
 
 		this.browse( sort );
 	},
 
 	// Filters and Tags.
 	onFilter: function( event ) {
 		var request,
 			$el = $( event.target ),
 			filter = $el.data( 'filter' );
 
 		// Bail if this is already active.
 		if ( $el.hasClass( this.activeClass ) ) {
 			return;
 		}
 
 		$( '.filter-links li > a, .theme-section' )
 			.removeClass( this.activeClass )
 			.removeAttr( 'aria-current' );
 		$el
 			.addClass( this.activeClass )
 			.attr( 'aria-current', 'page' );
 
 		if ( ! filter ) {
 			return;
 		}
 
 		// Construct the filter request
 		// using the default values.
 		filter = _.union( [ filter, this.filtersChecked() ] );
 		request = { tag: [ filter ] };
 
 		// Get the themes by sending Ajax POST request to api.wordpress.org/themes
 		// or searching the local cache.
 		this.collection.query( request );
 	},
 
 	// Clicking on a checkbox to add another filter to the request.
 	addFilter: function() {
 		this.filtersChecked();
 	},
 
 	// Applying filters triggers a tag request.
 	applyFilters: function( event ) {
 		var name,
 			tags = this.filtersChecked(),
 			request = { tag: tags },
 			filteringBy = $( '.filtered-by .tags' );
 
 		if ( event ) {
 			event.preventDefault();
 		}
 
 		if ( ! tags ) {
 			wp.a11y.speak( l10n.selectFeatureFilter );
 			return;
 		}
 
 		$( 'body' ).addClass( 'filters-applied' );
 		$( '.filter-links li > a.current' )
 			.removeClass( 'current' )
 			.removeAttr( 'aria-current' );
 
 		filteringBy.empty();
 
 		_.each( tags, function( tag ) {
 			name = $( 'label[for="filter-id-' + tag + '"]' ).text();
 			filteringBy.append( '<span class="tag">' + name + '</span>' );
 		});
 
 		// Get the themes by sending Ajax POST request to api.wordpress.org/themes
 		// or searching the local cache.
 		this.collection.query( request );
 	},
 
 	// Save the user's WordPress.org username and get his favorite themes.
 	saveUsername: function ( event ) {
 		var username = $( '#wporg-username-input' ).val(),
 			nonce = $( '#wporg-username-nonce' ).val(),
 			request = { browse: 'favorites', user: username },
 			that = this;
 
 		if ( event ) {
 			event.preventDefault();
 		}
 
 		// Save username on enter.
 		if ( event.type === 'keyup' && event.which !== 13 ) {
 			return;
 		}
 
 		return wp.ajax.send( 'save-wporg-username', {
 			data: {
 				_wpnonce: nonce,
 				username: username
 			},
 			success: function () {
 				// Get the themes by sending Ajax POST request to api.wordpress.org/themes
 				// or searching the local cache.
 				that.collection.query( request );
 			}
 		} );
 	},
 
 	/**
 	 * Get the checked filters.
 	 *
 	 * @return {Array} of tags or false
 	 */
 	filtersChecked: function() {
 		var items = $( '.filter-group' ).find( ':checkbox' ),
 			tags = [];
 
 		_.each( items.filter( ':checked' ), function( item ) {
 			tags.push( $( item ).prop( 'value' ) );
 		});
 
 		// When no filters are checked, restore initial state and return.
 		if ( tags.length === 0 ) {
 			$( '.filter-drawer .apply-filters' ).find( 'span' ).text( '' );
 			$( '.filter-drawer .clear-filters' ).hide();
 			$( 'body' ).removeClass( 'filters-applied' );
 			return false;
 		}
 
 		$( '.filter-drawer .apply-filters' ).find( 'span' ).text( tags.length );
 		$( '.filter-drawer .clear-filters' ).css( 'display', 'inline-block' );
 
 		return tags;
 	},
 
 	activeClass: 'current',
 
 	/**
 	 * When users press the "Upload Theme" button, show the upload form in place.
 	 */
 	uploader: function() {
 		var uploadViewToggle = $( '.upload-view-toggle' ),
 			$body = $( document.body );
 
 		uploadViewToggle.on( 'click', function() {
 			// Toggle the upload view.
 			$body.toggleClass( 'show-upload-view' );
 			// Toggle the `aria-expanded` button attribute.
 			uploadViewToggle.attr( 'aria-expanded', $body.hasClass( 'show-upload-view' ) );
 		});
 	},
 
 	// Toggle the full filters navigation.
 	moreFilters: function( event ) {
 		var $body = $( 'body' ),
 			$toggleButton = $( '.drawer-toggle' );
 
 		event.preventDefault();
 
 		if ( $body.hasClass( 'filters-applied' ) ) {
 			return this.backToFilters();
 		}
 
 		this.clearSearch();
 
 		themes.router.navigate( themes.router.baseUrl( '' ) );
 		// Toggle the feature filters view.
 		$body.toggleClass( 'show-filters' );
 		// Toggle the `aria-expanded` button attribute.
 		$toggleButton.attr( 'aria-expanded', $body.hasClass( 'show-filters' ) );
 	},
 
 	/**
 	 * Clears all the checked filters.
 	 *
 	 * @uses filtersChecked()
 	 */
 	clearFilters: function( event ) {
 		var items = $( '.filter-group' ).find( ':checkbox' ),
 			self = this;
 
 		event.preventDefault();
 
 		_.each( items.filter( ':checked' ), function( item ) {
 			$( item ).prop( 'checked', false );
 			return self.filtersChecked();
 		});
 	},
 
 	backToFilters: function( event ) {
 		if ( event ) {
 			event.preventDefault();
 		}
 
 		$( 'body' ).removeClass( 'filters-applied' );
 	},
 
 	clearSearch: function() {
 		$( '#wp-filter-search-input').val( '' );
 	}
 });
 
 themes.InstallerRouter = Backbone.Router.extend({
 	routes: {
 		'theme-install.php?theme=:slug': 'preview',
 		'theme-install.php?browse=:sort': 'sort',
 		'theme-install.php?search=:query': 'search',
 		'theme-install.php': 'sort'
 	},
 
 	baseUrl: function( url ) {
 		return 'theme-install.php' + url;
 	},
 
 	themePath: '?theme=',
 	browsePath: '?browse=',
 	searchPath: '?search=',
 
 	search: function( query ) {
 		$( '.wp-filter-search' ).val( query.replace( /\+/g, ' ' ) );
 	},
 
 	navigate: navigateRouter
 });
 
 
 themes.RunInstaller = {
 
 	init: function() {
 		// Set up the view.
 		// Passes the default 'section' as an option.
 		this.view = new themes.view.Installer({
 			section: 'popular',
 			SearchView: themes.view.InstallerSearch
 		});
 
 		// Render results.
 		this.render();
 
 		// Start debouncing user searches after Backbone.history.start().
 		this.view.SearchView.doSearch = _.debounce( this.view.SearchView.doSearch, 500 );
 	},
 
 	render: function() {
 
 		// Render results.
 		this.view.render();
 		this.routes();
 
 		if ( Backbone.History.started ) {
 			Backbone.history.stop();
 		}
 		Backbone.history.start({
 			root: themes.data.settings.adminUrl,
 			pushState: true,
 			hashChange: false
 		});
 	},
 
 	routes: function() {
 		var self = this,
 			request = {};
 
 		// Bind to our global `wp.themes` object
 		// so that the router is available to sub-views.
 		themes.router = new themes.InstallerRouter();
 
 		// Handles `theme` route event.
 		// Queries the API for the passed theme slug.
 		themes.router.on( 'route:preview', function( slug ) {
 
 			// Remove existing handlers.
 			if ( themes.preview ) {
 				themes.preview.undelegateEvents();
 				themes.preview.unbind();
 			}
 
 			// If the theme preview is active, set the current theme.
 			if ( self.view.view.theme && self.view.view.theme.preview ) {
 				self.view.view.theme.model = self.view.collection.findWhere( { 'slug': slug } );
 				self.view.view.theme.preview();
 			} else {
 
 				// Select the theme by slug.
 				request.theme = slug;
 				self.view.collection.query( request );
 				self.view.collection.trigger( 'update' );
 
 				// Open the theme preview.
 				self.view.collection.once( 'query:success', function() {
 					$( 'div[data-slug="' + slug + '"]' ).trigger( 'click' );
 				});
 
 			}
 		});
 
 		/*
 		 * Handles sorting / browsing routes.
 		 * Also handles the root URL triggering a sort request
 		 * for `popular`, the default view.
 		 */
 		themes.router.on( 'route:sort', function( sort ) {
 			if ( ! sort ) {
 				sort = 'popular';
 				themes.router.navigate( themes.router.baseUrl( '?browse=popular' ), { replace: true } );
 			}
 			self.view.sort( sort );
 
 			// Close the preview if open.
 			if ( themes.preview ) {
 				themes.preview.close();
 			}
 		});
 
 		// The `search` route event. The router populates the input field.
 		themes.router.on( 'route:search', function() {
 			$( '.wp-filter-search' ).trigger( 'focus' ).trigger( 'keyup' );
 		});
 
 		this.extraRoutes();
 	},
 
 	extraRoutes: function() {
 		return false;
 	}
 };
 
 // Ready...
 $( function() {
 	if ( themes.isInstall ) {
 		themes.RunInstaller.init();
 	} else {
 		themes.Run.init();
 	}
 
 	// Update the return param just in time.
 	$( document.body ).on( 'click', '.load-customize', function() {
 		var link = $( this ), urlParser = document.createElement( 'a' );
 		urlParser.href = link.prop( 'href' );
 		urlParser.search = $.param( _.extend(
 			wp.customize.utils.parseQueryString( urlParser.search.substr( 1 ) ),
 			{
 				'return': window.location.href
 			}
 		) );
 		link.prop( 'href', urlParser.href );
 	});
 
 	$( '.broken-themes .delete-theme' ).on( 'click', function() {
 		return confirm( _wpThemeSettings.settings.confirmDelete );
 	});
 });
 
 })( jQuery );
 
 // Align theme browser thickbox.
 jQuery( function($) {
 	window.tb_position = function() {
 		var tbWindow = $('#TB_window'),
 			width = $(window).width(),
 			H = $(window).height(),
 			W = ( 1040 < width ) ? 1040 : width,
 			adminbar_height = 0;
 
 		if ( $('#wpadminbar').length ) {
 			adminbar_height = parseInt( $('#wpadminbar').css('height'), 10 );
 		}
 
 		if ( tbWindow.length >= 1 ) {
 			tbWindow.width( W - 50 ).height( H - 45 - adminbar_height );
 			$('#TB_iframeContent').width( W - 50 ).height( H - 75 - adminbar_height );
 			tbWindow.css({'margin-left': '-' + parseInt( ( ( W - 50 ) / 2 ), 10 ) + 'px'});
 			if ( typeof document.body.style.maxWidth !== 'undefined' ) {
 				tbWindow.css({'top': 20 + adminbar_height + 'px', 'margin-top': '0'});
 			}
 		}
 	};
 
 	$(window).on( 'resize', function(){ tb_position(); });
 });