WordPress/wp-includes/js/media/routers/manage.js

/**
 * A router for handling the browser history and application state.
 *
 * @constructor
 * @augments Backbone.Router
 */
var Router = Backbone.Router.extend({
	routes: {
		'upload.php?item=:slug':    'showItem',
		'upload.php?search=:query': 'search'
	},

	// Map routes against the page URL
	baseUrl: function( url ) {
		return 'upload.php' + url;
	},

	// Respond to the search route by filling the search field and trigggering the input event
	search: function( query ) {
		jQuery( '#media-search-input' ).val( query ).trigger( 'input' );
	},

	// Show the modal with a specific item
	showItem: function( query ) {
		var media = wp.media,
			library = media.frame.state().get('library'),
			item;

		// Trigger the media frame to open the correct item
		item = library.findWhere( { id: parseInt( query, 10 ) } );
		if ( item ) {
			media.frame.trigger( 'edit:attachment', item );
		} else {
			item = media.attachment( query );
			media.frame.listenTo( item, 'change', function( model ) {
				media.frame.stopListening( item );
				media.frame.trigger( 'edit:attachment', model );
			} );
			item.fetch();
		}
	}
});

module.exports = Router;