build/history/history-debug.js

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/*
Copyright (c) 2007, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.4.0
*/
/**
 * The Browser History Manager provides the ability to use the back/forward
 * navigation buttons in a DHTML application. It also allows a DHTML
 * application to be bookmarked in a specific state.
 *
 * This library requires the following static markup:
 *
 * <iframe id="yui-history-iframe" src="path-to-real-asset-in-same-domain"></iframe>
 * <input id="yui-history-field" type="hidden">
 *
 * @module history
 * @requires yahoo,event
 * @namespace YAHOO.util
 * @title Browser History Manager
 */

/**
 * The History class provides the ability to use the back/forward navigation
 * buttons in a DHTML application. It also allows a DHTML application to
 * be bookmarked in a specific state.
 *
 * @class History
 * @constructor
 */
YAHOO.util.History = (function () {

    /**
     * Our hidden IFrame used to store the browsing history.
     *
     * @property _histFrame
     * @type HTMLIFrameElement
     * @default null
     * @private
     */
    var _histFrame = null;

    /**
     * INPUT field (with type="hidden" or type="text") or TEXTAREA.
     * This field keeps the value of the initial state, current state
     * the list of all states across pages within a single browser session.
     *
     * @property _stateField
     * @type HTMLInputElement|HTMLTextAreaElement
     * @default null
     * @private
     */
    var _stateField = null;

    /**
     * Flag used to tell whether YAHOO.util.History.initialize has been called.
     *
     * @property _initialized
     * @type boolean
     * @default false