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name : elFinder.history.js
 /**
 * @class elFinder.history
 * Store visited folders
 * and provide "back" and "forward" methods
 *
 * @author Dmitry (dio) Levashov
 */
elFinder.prototype.history = function(fm) {
	"use strict";
	var self = this,
		/**
		 * Update history on "open" event?
		 *
		 * @type Boolean
		 */
		update = true,
		/**
		 * Directories hashes storage
		 *
		 * @type Array
		 */
		history = [],
		/**
		 * Current directory index in history
		 *
		 * @type Number
		 */
		current,
		/**
		 * Clear history
		 *
		 * @return void
		 */
		reset = function() {
			history = [fm.cwd().hash];
			current = 0;
			update  = true;
		},
		/**
		 * Browser native history object
		 */
		nativeHistory = (fm.options.useBrowserHistory && window.history && window.history.pushState)? window.history : null,
		/**
		 * Open prev/next folder
		 *
		 * @Boolen  open next folder?
		 * @return jQuery.Deferred
		 */
		go = function(fwd) {
			if ((fwd && self.canForward()) || (!fwd && self.canBack())) {
				update = false;
				return fm.exec('open', history[fwd ? ++current : --current]).fail(reset);
			}
			return jQuery.Deferred().reject();
		},
		/**
		 * Sets the native history.
		 *
		 * @param String thash target hash
		 */
		setNativeHistory = function(thash) {
			if (nativeHistory && (! nativeHistory.state || nativeHistory.state.thash !== thash)) {
				nativeHistory.pushState({thash: thash}, null, location.pathname + location.search + (thash? '#elf_' + thash : ''));
			}
		};
	
	/**
	 * Return true if there is previous visited directories
	 *
	 * @return Boolen
	 */
	this.canBack = function() {
		return current > 0;
	};
	
	/**
	 * Return true if can go forward
	 *
	 * @return Boolen
	 */
	this.canForward = function() {
		return current < history.length - 1;
	};
	
	/**
	 * Go back
	 *
	 * @return void
	 */
	this.back = go;
	
	/**
	 * Go forward
	 *
	 * @return void
	 */
	this.forward = function() {
		return go(true);
	};
	
	// bind to elfinder events
	fm.bind('init', function() {
		if (nativeHistory && !nativeHistory.state) {
			setNativeHistory(fm.startDir());
		}
	})
	.open(function() {
		var l = history.length,
			cwd = fm.cwd().hash;

		if (update) {
			current >= 0 && l > current + 1 && history.splice(current+1);
			history[history.length-1] != cwd && history.push(cwd);
			current = history.length - 1;
		}
		update = true;

		setNativeHistory(cwd);
	})
	.reload(fm.options.reloadClearHistory && reset);
	
};
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