/*
 * Autocomplete - jQuery plugin 1.0.2
 *
 * Copyright (c) 2007 Dylan Verheul, Dan G. Switzer, Anjesh Tuladhar, Jörn Zaefferer
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.autocomplete.js 5747 2008-06-25 18:30:55Z joern.zaefferer $
 *
 */

;(function($) {
	
$.fn.extend({
	//入口，初始化autosuggest
	autocomplete: function(urlOrData, options) {
		
		var isUrl = typeof urlOrData == "string";//判断是否url还是静态数据
		options = $.extend({}, $.Autocompleter.defaults, {
			url: isUrl ? urlOrData : null,//如果是url则使用url
			data: isUrl ? null : urlOrData,//如果是不是url则使用静态数据
			delay: isUrl ? $.Autocompleter.defaults.delay : 10,//如果是utl则使用默认设置，静态使用10毫秒
			max: options && !options.scroll ? 10 : 150//最大显示选项数
		}, options);
		
		// if highlight is set to false, replace it with a do-nothing function
		options.highlight = options.highlight || function(value) { return value; };
		
		// if the formatMatch option is not specified, then use formatItem for backwards compatibility
		//modify by william
		//options.formatMatch = options.formatMatch || options.formatItem;//是否设置了formatMatch，没有则使用options.formatItem
		
		return this.each(function() {
			new $.Autocompleter(this, options);
		});
	},
	result: function(handler) {
		
		return this.bind("result", handler);
	},
	search: function(handler) {
		
		return this.trigger("search", [handler]);
	},
	flushCache: function() {
		
		return this.trigger("flushCache");
	},
	setOptions: function(options){
		
		return this.trigger("setOptions", [options]);
	},
	unautocomplete: function() {
		
		return this.trigger("unautocomplete");
	}
});
//使用此函数生成autocompleter对象,input是需要具有autocompleter功能的对象
$.Autocompleter = function(input, options) {
    
	var KEY = {
		UP: 38,
		DOWN: 40,
		DEL: 46,
		TAB: 9,
		RETURN: 13,
		ESC: 27,
		COMMA: 188,
		PAGEUP: 33,
		PAGEDOWN: 34,
		BACKSPACE: 8
	};

	// Create $ object for input element
	//为输入元素创建一个$object元素
	var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);

	var timeout;
	var previousValue = "";//先前的值
	var cache = $.Autocompleter.Cache(options);
	var hasFocus = 0;//获得焦点的次数
	var lastKeyPressCode;
	var config = {
		mouseDownOnSelect: false
	};
		//options 选项设置
		//input autosuggest输入对象
		//selectCurrent是个函数
	var select = $.Autocompleter.Select(options, input, selectCurrent, config);
	
	var blockSubmit;
	
	// prevent form submit in opera when selecting with return key
	$.browser.opera && $(input.form).bind("submit.autocomplete", function() {
		
		if (blockSubmit) {
			blockSubmit = false;
			return false;
		}
	});
	
	// only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
	$input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function(event) {
		// track last key pressed
		
		lastKeyPressCode = event.keyCode;
		switch(event.keyCode) {
		
			case KEY.UP:
				event.preventDefault();
				if ( select.visible() ) {
					select.prev();
				} else {
					onChange(0, true);
				}
				break;
				
			case KEY.DOWN:
				event.preventDefault();
				if ( select.visible() ) {
					select.next();
				} else {
					onChange(0, true);
				}
				break;
				
			case KEY.PAGEUP:
				event.preventDefault();
				if ( select.visible() ) {
					select.pageUp();
				} else {
					onChange(0, true);
				}
				break;
				
			case KEY.PAGEDOWN:
				event.preventDefault();
				if ( select.visible() ) {
					select.pageDown();
				} else {
					onChange(0, true);
				}
				break;
			
			// matches also semicolon
			case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
			case KEY.TAB:
			case KEY.RETURN:
				if( selectCurrent() ) {
					// stop default to prevent a form submit, Opera needs special handling
					event.preventDefault();
					blockSubmit = true;
					return false;
				}
				break;
				
			case KEY.ESC:
				select.hide();
				break;
				
			default:
				clearTimeout(timeout);
				timeout = setTimeout(onChange, options.delay);
				break;
		}
	}).focus(function(){
		// track whether the field has focus, we shouldn't process any
		// results if the field no longer has focus
		
		hasFocus++;
	}).blur(function() {
		//失去焦点时
		
		hasFocus = 0;
		if (!config.mouseDownOnSelect) {
			hideResults();
		}
		select.panelShow=false;
	}).click(function() {
		
		// show select when clicking in a focused field
		if ( ++hasFocus > 1 && !select.visible() ) {
			onChange(0, true);
		}
		
		//判断input是否为空且是否要显示默认的值//end add by william
		var currentValue = $input.val();
		if(options.hasDefault && $.trim(currentValue).length<1)
		{
			showDefaut();
		}
	}).bind("search", function() {
		
		// TODO why not just specifying both arguments?
		var fn = (arguments.length > 1) ? arguments[1] : null;
		function findValueCallback(q, data) {
			
			var result;
			if( data && data.length ) {
				for (var i=0; i < data.length; i++) {
					if( data[i].result.toLowerCase() == q.toLowerCase() ) {
						result = data[i];
						break;
					}
				}
			}
			if( typeof fn == "function" ) fn(result);
			else $input.trigger("result", result && [result.data, result.value]);
		}
		$.each(trimWords($input.val()), function(i, value) {
			request(value, findValueCallback, findValueCallback);
		});
	}).bind("flushCache", function() {
		
		cache.flush();
	}).bind("setOptions", function() {
		
		$.extend(options, arguments[1]);
		// if we've updated the data, repopulate
		if ( "data" in arguments[1] )
			cache.populate();
	}).bind("unautocomplete", function() {
		
		select.unbind();
		$input.unbind();
		$(input.form).unbind(".autocomplete");
	}).bind("showAllCity",function(){
		var data = cache.getAllData();
		stopLoading();//去掉lodingClass
		select.displayAll(data);//显示数据,填充数据项到div ul
		autoFill("", data[0].value);//
		select.show(true);//显示数据项
	}).bind("showHotCity",function(){
		showDefaut();	
	});
	
	
	function selectCurrent() {
		
		var selected = select.selected();
		if( !selected )
			return false;
		
		var v = selected.result;
		previousValue = v;
		
		if ( options.multiple ) {
			var words = trimWords($input.val());
			if ( words.length > 1 ) {
				v = words.slice(0, words.length - 1).join( options.multipleSeparator ) + options.multipleSeparator + v;
			}
			v += options.multipleSeparator;
		}
		
		$input.val(v);
		hideResultsNow();
		$input.trigger("result", [selected.data, selected.value]);
		return true;
	}//end selectCurrent
	//skipPrevCheck是否忽略前面的检查
	function onChange(crap, skipPrevCheck) {
		
		if( lastKeyPressCode == KEY.DEL ) {
			select.hide();
			return;
		}
		
		var currentValue = $input.val();
		
		if ( !skipPrevCheck && currentValue == previousValue )
			return;
		
		previousValue = currentValue;
		
		currentValue = lastWord(currentValue);
		
		if ( currentValue.length >= options.minChars) {
			$input.addClass(options.loadingClass);
			if (!options.matchCase)
				currentValue = currentValue.toLowerCase();
			//currentValue当前值
			//receiveData成功匹配时调用的函数
			//hideResultNow匹配失败时调用的函数
			request(currentValue, receiveData, hideResultsNow);
		} else {
			stopLoading();
			select.hide();
			showDefaut();//当为空时显示默认
		}
	};//end onChange
	//使用分隔符把值分割多个值，并且去掉空格，返回数组
	function trimWords(value) {
		
		if ( !value ) {
			return [""];
		}
		var words = value.split( options.multipleSeparator );
		var result = [];
		$.each(words, function(i, value) {
			if ( $.trim(value) )
				result[i] = $.trim(value);
		});
		return result;
	}//end trimWords
	//取得分隔后的数组的最后一个
	function lastWord(value) {
		if ( !options.multiple )
			return value;
		var words = trimWords(value);
		return words[words.length - 1];
	}//end lastWord
	
	// fills in the input box w/the first match (assumed to be the best match)
	// q: the term entered
	// sValue: the first matching result
	function autoFill(q, sValue){
		
		// autofill in the complete box w/the first match as long as the user hasn't entered in more data
		// if the last user key pressed was backspace, don't autofill
		if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) {
			// fill in the value (keep the case the user has typed)
			$input.val($input.val() + sValue.substring(lastWord(previousValue).length));
			// select the portion of the value not typed by the user (so the next character will erase)
			$.Autocompleter.Selection(input, previousValue.length, previousValue.length + sValue.length);
		}
	};//end autoFill

	function hideResults() {
		
		clearTimeout(timeout);
		timeout = setTimeout(hideResultsNow, 200);//200毫秒后调用hideResultsNow
	};//end hideResults

	function hideResultsNow() {
		
		if(select.getPanelShow())
		{
			select.setPanelShow(false);
			$input.focus();
			return;
		} 
		select.setPanelShow(false);
		var wasVisible = select.visible();//决断整个box的div是否可见
		select.hide();
		clearTimeout(timeout);
		stopLoading();
		if (options.mustMatch) {
			// call search and run callback
			$input.search(
				function (result){
					// if no value found, clear the input box
					if( !result ) {
						if (options.multiple) {
							var words = trimWords($input.val()).slice(0, -1);
							$input.val( words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : "") );
						}
						else
							$input.val( "" );
					}
				}
			);
		}
		if (wasVisible)
			// position cursor at end of input field
			$.Autocompleter.Selection(input, input.value.length, input.value.length);
	};//end hideResultsNow
	//请求数据成功时调用的函数  q-关键字  data匹配过滤后的数据
	function receiveData(q, data) {
		
		if ( data && data.length && hasFocus ) {
			stopLoading();//去掉lodingClass
			select.display(data, q);//显示数据,填充数据项到div ul
			autoFill(q, data[0].value);//
			select.show();//显示数据项
		} else {
			hideResultsNow();
		}
	};//end receiveData
	
	function showDefaut()//add by william
	{
		
		var data = cache.getDefaultData();
		stopLoading();//去掉lodingClass
		select.displayDefault(data);//显示数据,填充数据项到div ul
		autoFill("", data[0].value);//
		select.showDefault();//显示数据项
	}
	
    //根据输入的关键字term取得数据，如果成功调用success函数，失败则调用failure函数
	function request(term, success, failure) {
		
		if (!options.matchCase)//如果不是大小写敏感，全部转化为小写
			term = term.toLowerCase();

		var data = cache.load(term);//term key word从静态数据缓存中加载数据,非ajax情况，返回null
		// recieve the cached data 如果是静态数据，从缓存中取得数据
		if (data && data.length) {
			success(term, data);
		// if an AJAX url has been supplied, try loading the data now
		} else if( (typeof options.url == "string") && (options.url.length > 0) ){
			
			var extraParams = {
				timestamp: +new Date()
			};
			$.each(options.extraParams, function(key, param) {
				extraParams[key] = typeof param == "function" ? param() : param;
			});
			
			$.ajax({
				// try to leverage ajaxQueue plugin to abort previous requests
				mode: "abort",
				// limit abortion to this input
				port: "autocomplete" + input.name,
				dataType: options.dataType,
				url: options.url,
				data: $.extend({
					q: lastWord(term),
					limit: options.max
				}, extraParams),
				success: function(data) {
					var parsed = options.parse && options.parse(data) || parse(data);
					cache.add(term, parsed);
					success(term, parsed);
				}
			});
		} else {
			// if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
			select.emptyList();
			failure(term);
		}
	};//end request
	
	function parse(data) {
		
		var parsed = [];
		var rows = data.split("\n");
		for (var i=0; i < rows.length; i++) {
			var row = $.trim(rows[i]);
			if (row) {
				row = row.split("|");
				parsed[parsed.length] = {
					data: row,
					value: row[0],
					result: options.formatResult && options.formatResult(row, row[0]) || row[0]
				};
			}
		}
		return parsed;
	};//end parse
	//去掉lodingClass而已
	function stopLoading() {
		
		$input.removeClass(options.loadingClass);
	};//end stopLoading

};//end $.Autocompleter

$.Autocompleter.defaults = {
	inputClass: "ac_input",
	resultsClass: "ac_results",
	loadingClass: "ac_loading",
	matchMutil:false,//是否要匹配多个数据域，与mutilFields同用//modify by william
	mutilFields:null,//多个数据域的名称，用豆号隔开//modify by william
	minChars: 1,//输入多少字符串时开始autosuggest
	delay: 400,
	defaultData:null,//end add by william
	hasDefault:false,//第一次点击里，还未输入数据的问题下，是否默认显示列表//end add by william
	matchCase: false,
	matchSubset: true,
	matchContains: false,
	cacheLength: 10,
	max: 30,
	mustMatch: false,
	extraParams: {},
	selectFirst: true,
	formatItem: function(row) { return row[0]; },//格式化显示的数据
	formatMatch: function(row) { return row[0]; },//modify by william二次过滤，自定义一些二次过滤的规则，返回true说明匹配，false表示不匹配
	autoFill: false,
	width: 0,
	multiple: false,
	multipleSeparator: ", ",
	highlight: function(value, term) {//高亮关键字
	     return value;
		//return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
	},
    scroll: true,
    scrollHeight: 210
};//end  $.Autocompleter.defaults
//只针对静态数据
$.Autocompleter.Cache = function(options) {

	var data = {};
	var length = 0;
	var defaultData = [];//默认数据
	var allData = [];
	//row为传入的数据对象，判断sub是否数据对象的子串
	function matchSubset(row, sub) {//modify by william s-->row
	   if(options.matchMutil)//如果要匹配多个域 modify by william
	   {
	       var fields = options.mutilFields.split(",");
		   for(var j=0;j<fields.length;j++)
		   {
		       var s = row.data[fields[j]];
		       if (!options.matchCase) //如果不是大小写敏感，全部转化为小写
		       {
		       	s = s.toLowerCase();
		       }
	    	   var i = s.indexOf(sub);
	    	   if (i == -1) continue;
	    	   if(i == 0 || options.matchContains)
	    	   {
	    	   		return true;
	    	   }
		   }
		   return false;//不匹配
	   }
	   else
	   {
	   		var s = row.value;//modify by william add
	    	if (!options.matchCase) //如果不是大小写敏感，全部转化为小写
		    	s = s.toLowerCase();
	    	var i = s.indexOf(sub);
	    	if (i == -1) return false;//-1表示不包含串
	    	return i == 0 || options.matchContains;
	   }
		
	};//end matchSubset
	
	function add(q, value) {
		if (length > options.cacheLength){//如果长度已经大于可以缓存的长度则清空缓存
			flush();
		}
		if (!data[q]){ //如果数据不存在，则增加cache长度，放数据到缓存中
			length++;
		}
		data[q] = value;
	}////end add
	
	function populate(){
		if(options.hasDefault && options.defaultData )//处理默认数据 add by william
		{
			for ( var i = 0, ol = options.defaultData.length; i < ol; i++ ) {
			  var rawValue = options.defaultData[i];
			  
			// if rawValue is a string, make an array otherwise just reference the array
			//如果原始数据只是一个字符串，把他构造成一个数组
			rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;
			//用于匹配的串，默认是rawValue[0]，可以自定义，通过覆盖formatMatch函数
			var value = options.formatMatch(rawValue, i+1, options.defaultData.length);
			if ( value === false )
				continue;
			// if the match is a string
			var row = {
				value: value,
				data: rawValue,
				result: options.formatResult && options.formatResult(rawValue) || value
			};
				
			defaultData.push(row);
			
			}
		}//end add by william
		if( !options.data ) return false;//如果没有静态数据则返false
		// track the matches
		var stMatchSets = {},//跟踪匹配的项
			nullData = 0;

		// no url was specified, we need to adjust the cache length to make sure it fits the local data store
		if( !options.url ) options.cacheLength = 1;//如果url没有指定，我们需要调查cache length来确保它合适于本地数据存储
		
		// track all options for minChars = 0
		stMatchSets[""] = [];
		var fields = options.mutilFields.split(",");
		// loop through the array and create a lookup structure循环整个options中的数据
		for ( var i = 0, ol = options.data.length; i < ol; i++ ) {
			var rawValue = options.data[i];
			// if rawValue is a string, make an array otherwise just reference the array
			//如果原始数据只是一个字符串，把他构造成一个数组
			rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;
			var row = {
				value: value,
				data: rawValue,
			  	result: options.formatResult && options.formatResult(rawValue) || value
			 };
			  allData.push(row);
			if(options.matchMutil)//如果要匹配多个域 modify by william
			{
				for(var j=0;j<fields.length;j++)
				{
				    var value = options.data[i][fields[j]];
				    var firstStr = value.substring(0,1).toLowerCase();//取得第一个字符
				    
				    if( !stMatchSets[firstStr] ) 
				    {
				       stMatchSets[firstStr] = [];
				    }
			    	  
			          if($.inArray(row,stMatchSets[firstStr])==-1)
			          {
			          		stMatchSets[firstStr].push(row);
			          }
			         
				}
			}
			else
			{
			    var value = options.formatMatch(rawValue, i+1, options.data.length);
			
			   if ( value === false )
				   continue;
				
		    	var firstChar = value.charAt(0).toLowerCase();
		    	// if no lookup array for this character exists, look it up now
			   if( !stMatchSets[firstChar] ) 
			    	stMatchSets[firstChar] = [];

		    	// if the match is a string
			    var row = {
				   value: value,
				   data: rawValue,
			  	   result: options.formatResult && options.formatResult(rawValue) || value
			    };
			
		    	// push the current match into the set list
		    	stMatchSets[firstChar].push(row);
			}//end else if(options.matchMutil)
			

			// keep track of minChars zero items
			if ( nullData++ < options.max ) {
				//stMatchSets[""].push(row);
			}
		};

		// add the data items to the cache
		$.each(stMatchSets, function(i, value) {
			// increase the cache size
			options.cacheLength++;
			// add to the cache
			add(i, value);
		});
	}//populate
	
	// populate any existing data
	
	setTimeout(populate, 25);//初始化数据，加载立即初始化
	
	
	function flush(){//清空数据
		data = {};
		length = 0;
	}//end flush
	
	function getDefaultData()
	{
		return defaultData;
	}
	
	return {
		flush: flush,//清除缓存
		add: add,//向缓存中增加一条数据
		getDefaultData:getDefaultData,//取得默认数据//add by william
		populate: populate,//初始化缓存数组，使用首字母作为索引
		getAllData:function() {return allData;},
		load: function(q) {//q为输入的关键字，此通过输入的关键字来加载匹配的串，返回数组
			if (!options.cacheLength || !length)//设置cacheLength为0时或静态缓存区中没有数据时返回null
				return null;
			/* 
			 * if dealing w/local data and matchContains than we must make sure
			 * to loop through all the data collections looking for matches
			 */
			if( !options.url && options.matchContains ){//处理包含的情况
				// track all matches
				var csub = [];
				// loop through all the data grids for matches循环所有静态数据
				for( var k in data ){
					// don't search through the stMatchSets[""] (minChars: 0) cache
					// this prevents duplicates
					if( k.length > 0 ){
						var c = data[k];
						$.each(c, function(i, x) {
							// if we've got a match, add it to the array
							if (matchSubset(x, q)) {//modify by william x.value-->x
								csub.push(x);
							}
						});
					}
				}				
				return csub;
			} else 
			// if the exact item exists, use it
			if (data[q]){
				return data[q];//项目已经存在的情况
			} else
			if (options.matchSubset) {//匹配字串
				for (var i = q.length - 1; i >= options.minChars; i--) {
					var c = data[q.substr(0, i)];
					if (c) {
						var csub = [];
						$.each(c, function(i, x) {
							//x.value 整个串，q关键字 比如 q=ka是否是kaee的字串
							if (matchSubset(x, q)) {//modify by william x.value-->x
								csub[csub.length] = x;//是字串，把串放到csub数组中
							}
						});
						return csub;
					}
				}
			}
			return null;
		}
	};//e nd return
};//end $.Autocompleter.Cache 

$.Autocompleter.Select = function (options, input, select, config) {
	var CLASSES = {
		ACTIVE: "ac_over"
	};
	var panelShow = false;//用于决断失去焦点时，是否还需要继续显示panel
	var listItems,//当前(li)选项的数组，在fillList中初始化
		active = -1,//当前高亮的活动的项
		data,
		term = "",
		needsInit = true,
		element,
		titlePanel,
		list;//当前(ul)组在init()中初始化
	var hotCitySpan,allCitySpan;//热门城市列表，所有城市列表
	// Create results 创建显示列表的div
	function init() {
		
		if (!needsInit)//是否需要初始化,只需初始化一次
			return;
		element = $("<div/>")
		.hide()
		.addClass(options.resultsClass)
		.css("position", "absolute")
		.appendTo(document.body);//在body下创建一个div
		titlePanel = $("<div class='titlepanel_div'></div>").appendTo(element);
		hotCitySpan = $("<span class='hotcity_span'>热门城市</span>").click(function(event){showHotCity(event);});
		allCitySpan = $("<span class='allcity_span'>全部城市</span>").click(function(event){showAllCity(event)});
		titlePanel.append(hotCitySpan);
		titlePanel.append(allCitySpan);
		list = $("<ul/>").appendTo(element).mouseover( function(event) {
			if(target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
	            active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
			    $(target(event)).addClass(CLASSES.ACTIVE);            
	        }
		}).click(function(event) {
			$(target(event)).addClass(CLASSES.ACTIVE);
			select();
			// TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
			input.focus();
			return false;
		}).mousedown(function() {
			config.mouseDownOnSelect = true;
		}).mouseup(function() {
			config.mouseDownOnSelect = false;
		});
		
		if( options.width > 0 )
			element.css("width", options.width);
			
		needsInit = false;
	} //init
	
	function showAllCity(event)//显示全部城市机场信息
	{
		hotCitySpan.removeClass("active_city_span");
		allCitySpan.addClass("active_city_span");
		panelShow = true;
		$(input).triggerHandler("showAllCity");
	}
	
		function showHotCity(event)//显示热门城市机场信息，默认显示
	{
	    hotCitySpan.addClass("active_city_span");
		allCitySpan.removeClass("active_city_span");
		panelShow = true;
		$(input).triggerHandler("showHotCity");
	}
	
	function target(event) {
		var element = event.target;
		while(element && element.tagName != "LI")
			element = element.parentNode;
		// more fun with IE, sometimes event.target is empty, just ignore it then
		if(!element)
			return [];
		return element;
	}//end target

	function moveSelect(step) {
		listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
		movePosition(step);
        var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
        if(options.scroll) {
            var offset = 0;
            listItems.slice(0, active).each(function() {
				offset += this.offsetHeight;
			});
            if((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
                list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight());
            } else if(offset < list.scrollTop()) {
                list.scrollTop(offset);
            }
        }
	};//moveSelect
	
	function movePosition(step) {
		active += step;
		if (active < 0) {
			active = listItems.size() - 1;
		} else if (active >= listItems.size()) {
			active = 0;
		}
	}//movePosition
	
	function limitNumberOfItems(available) {
		return options.max && options.max < available
			? options.max
			: available;
	}//limitNumberOfItems
	//在div ul中添加数据项
	function fillList() {
		list.empty();
		var max = limitNumberOfItems(data.length);
		for (var i=0; i < max; i++) {
			if (!data[i])
				continue;
			var formatted = options.formatItem(data[i].data, i+1, max, data[i].value, term);
			if ( formatted === false )//等于false时，忽略
				continue;
			//创建一个li项，放至到ul下
			var li = $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
			$.data(li, "ac_data", data[i]);//在li上绑定数据
		}
		listItems = list.find("li");
		if ( options.selectFirst ) {//高亮第一个项
			listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
			active = 0;
		}
		// apply bgiframe if available
		if ( $.fn.bgiframe )
			list.bgiframe();
	}//fillList
	
	
	function fillAll()
	{
		list.empty();
		for (var i=0; i < data.length; i++) {
			if (!data[i])
				continue;
			var formatted = options.formatItem(data[i].data, i+1, data.length, data[i].value, term);
			if ( formatted === false )//等于false时，忽略
				continue;
			//创建一个li项，放至到ul下
			var li = $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
			$.data(li, "ac_data", data[i]);//在li上绑定数据
		}
		listItems = list.find("li");
		if ( options.selectFirst ) {//高亮第一个项
			listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
			active = 0;
		}
		// apply bgiframe if available
		if ( $.fn.bgiframe )
			list.bgiframe();
	}
	
	//显示默认
	function showDefault()
	{
		titlePanel.show();
		hotCitySpan.addClass("active_city_span");
		allCitySpan.removeClass("active_city_span");
		var offset = $(input).offset();//取得input 的偏移量 top left
			//决定div元素的宽度与位置并显示
			element.css({
				width: typeof options.defaultWidth == "string" || options.defaultWidth > 0 ? options.defaultWidth : $(input).width(),
				top: offset.top + input.offsetHeight,
				left: offset.left
			}).show();
			element.addClass("defaultul");
			element.find("li").css({lineHeight:"30px"});
            if(options.scroll) {
                list.scrollTop(0);
                list.css({
					maxHeight: options.scrollHeight,//ul的高度
					overflow: 'hidden'
				});
				
                if($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
					var listHeight = 0;
					listItems.each(function() {
						listHeight += this.offsetHeight;
					});
					var scrollbarsVisible = listHeight > options.scrollHeight;
                    list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight );
					if (!scrollbarsVisible) {
						// IE doesn't recalculate width when scrollbar disappears
						listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) );
					}
                }
                
            }
	}
	//普通显示
	function show(isTitlePanel) {
		if(isTitlePanel)//是否显示titlePanel,默认不显示
		{
		   titlePanel.show();
		}
		else
		{
		   titlePanel.hide();
		}
		
		var offset = $(input).offset();//取得input 的偏移量 top left
		element.removeClass("defaultul");//add by william
		//决定div元素的宽度与位置并显示
		element.css({
			width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
			top: offset.top + input.offsetHeight,
			left: offset.left
		}).show();
        if(options.scroll) {
            list.scrollTop(0);
            list.css({
				maxHeight: options.scrollHeight,//ul的高度
				overflow: 'auto'
			});
			
            if($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
				var listHeight = 0;
				listItems.each(function() {
					listHeight += this.offsetHeight;
				});
				var scrollbarsVisible = listHeight > options.scrollHeight;
                list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight );
				if (!scrollbarsVisible) {
					// IE doesn't recalculate width when scrollbar disappears
					listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) );
				}
            }
            
        }
	}
	
	return {
		display: function(d, q) {//显示数据，d=data匹配过滤后的串数组，q-输入的关键字
			init();//初始化显示数据的div,只需要初始化一次，通过needsInit进行判断
			data = d;
			term = q;
			fillList();//在div ul中添加数据项
		},//end display
		displayDefault:function(d){//add by william
			init();//初始化显示数据的div,只需要初始化一次，通过needsInit进行判断
			data = d;
			term = "";
			fillAll();//在div ul中添加数据项
		},
		displayAll:function(d){//add by william,显示所有
			init();//初始化显示数据的div,只需要初始化一次，通过needsInit进行判断
			data = d;
			term = "";
			fillAll();//在div ul中添加数据项
		},
		showDefault:showDefault,//显示默认
		next: function() {
			moveSelect(1);
		},// next
		prev: function() {
			moveSelect(-1);
		},//end prev
		pageUp: function() {
			if (active != 0 && active - 8 < 0) {
				moveSelect( -active );
			} else {
				moveSelect(-8);
			}
		},//end pageUp
		pageDown: function() {
			if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
				moveSelect( listItems.size() - 1 - active );
			} else {
				moveSelect(8);
			}
		},//end pageDown
		hide: function() {//隐藏整个div
			element && element.hide();
			listItems && listItems.removeClass(CLASSES.ACTIVE);
			active = -1;
		},//hide
		visible : function() {//判断元素是否可见，整个div
			return element && element.is(":visible");
		},//visible
		current: function() {
			return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
		},//current
		show: show,//end show
		selected: function() {
			var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
			return selected && selected.length && $.data(selected[0], "ac_data");
		},//selected
		emptyList: function (){
			list && list.empty();
		},//emptyList
		unbind: function() {
			element && element.remove();
		},//unbind
		getPanelShow:function()
		{
			return panelShow;
		},
		setPanelShow:function setPanelShow(v)
		{
			panelShow=v;
		}
	};//end return
};//end $.Autocompleter.Select

$.Autocompleter.Selection = function(field, start, end) {

	if( field.createTextRange ){
		var selRange = field.createTextRange();
		selRange.collapse(true);
		selRange.moveStart("character", start);
		selRange.moveEnd("character", end);
		selRange.select();
	} else if( field.setSelectionRange ){
		field.setSelectionRange(start, end);
	} else {
		if( field.selectionStart ){
			field.selectionStart = start;
			field.selectionEnd = end;
		}
	}
	field.focus();
};//end $.Autocompleter.Selection

})(jQuery);