(function($){
    var bigAutocomplete = new function(){
        this.currentInputText = null;//目前获得光标的输入框（解决一个页面多个输入框绑定自动补全功能）
        this.functionalKeyArray = [9,20,13,16,17,18,91,92,93,45,36,33,34,35,37,39,112,113,114,115,116,117,118,119,120,121,122,123,144,19,145,40,38,27];//键盘上功能键键值数组
        this.holdText = null;//输入框中原始输入的内容
        
        //初始化插入自动补全div，并在document注册mousedown，点击非div区域隐藏div
        this.init = function(){
            $("body").append("<div id='bigAutocompleteContent' class='bigautocomplete-layout'></div>");
            $(document).bind('mousedown',function(event){
                var $target = $(event.target);
                if((!($target.parents().andSelf().is('#bigAutocompleteContent'))) && (!$target.is(bigAutocomplete.currentInputText))){
                    bigAutocomplete.hideAutocomplete();
                }
            })
            
            //鼠标悬停时选中当前行
            $("#bigAutocompleteContent").delegate("tr", "mouseover", function() {
                $("#bigAutocompleteContent tr").removeClass("ct");
                $(this).addClass("ct");
            }).delegate("tr", "mouseout", function() {
                $("#bigAutocompleteContent tr").removeClass("ct");
            });        
            
            
            //单击选中行后，选中行内容设置到输入框中，并执行callback函数
            $("#bigAutocompleteContent").delegate("tr", "click", function() {
                bigAutocomplete.currentInputText.val( $(this).find("div:last").html());
                var callback_ = bigAutocomplete.currentInputText.data("config").callback;
                if($("#bigAutocompleteContent").css("display") != "none" && callback_ && $.isFunction(callback_)){
                    callback_($(this).data("jsonData"));
                    
                }                
                bigAutocomplete.hideAutocomplete();
            })            
            
        }
        
        this.autocomplete = function(param){
            
            if($("body").length > 0 && $("#bigAutocompleteContent").length <= 0){
                bigAutocomplete.init();//初始化信息
            }            
            
            var $this = $(this);//为绑定自动补全功能的输入框jquery对象
            
            var $bigAutocompleteContent = $("#bigAutocompleteContent");
            
            this.config = {
                           //width:下拉框的宽度，默认使用输入框宽度
                           width:$this.outerWidth() - 2,
                           //url：格式url:""用来ajax后台获取数据，返回的数据格式为data参数一样
                           url:null,
                           /*data：格式{data:[{title:null,result:{}},{title:null,result:{}}]}
                           url和data参数只有一个生效，data优先*/
                           data:null,
                           //callback：选中行后按回车或单击时回调的函数
                           callback:null};
            $.extend(this.config,param);
            
            $this.data("config",this.config);
            
            //输入框keydown事件
            $this.keydown(function(event) {
                switch (event.keyCode) {
                case 40://向下键
                    
                    if($bigAutocompleteContent.css("display") == "none")return;
                    
                    var $nextSiblingTr = $bigAutocompleteContent.find(".ct");
                    if($nextSiblingTr.length <= 0){//没有选中行时，选中第一行
                        $nextSiblingTr = $bigAutocompleteContent.find("tr:first");
                    }else{
                        $nextSiblingTr = $nextSiblingTr.next();
                    }
                    $bigAutocompleteContent.find("tr").removeClass("ct");
                    
                    if($nextSiblingTr.length > 0){//有下一行时（不是最后一行）
                        $nextSiblingTr.addClass("ct");//选中的行加背景
                        $this.val($nextSiblingTr.find("div:last").html());//选中行内容设置到输入框中
                        
                        //div滚动到选中的行,jquery-1.6.1 $nextSiblingTr.offset().top 有bug，数值有问题
                        $bigAutocompleteContent.scrollTop($nextSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $nextSiblingTr.height() );
                        
                    }else{
                        $this.val(bigAutocomplete.holdText);//输入框显示用户原始输入的值
                    }
                    
                    
                    break;
                case 38://向上键
                    if($bigAutocompleteContent.css("display") == "none")return;
                    
                    var $previousSiblingTr = $bigAutocompleteContent.find(".ct");
                    if($previousSiblingTr.length <= 0){//没有选中行时，选中最后一行行
                        $previousSiblingTr = $bigAutocompleteContent.find("tr:last");
                    }else{
                        $previousSiblingTr = $previousSiblingTr.prev();
                    }
                    $bigAutocompleteContent.find("tr").removeClass("ct");
                    
                    if($previousSiblingTr.length > 0){//有上一行时（不是第一行）
                        $previousSiblingTr.addClass("ct");//选中的行加背景
                        $this.val($previousSiblingTr.find("div:last").html());//选中行内容设置到输入框中
                        
                        //div滚动到选中的行,jquery-1.6.1 $$previousSiblingTr.offset().top 有bug，数值有问题
                        $bigAutocompleteContent.scrollTop($previousSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $previousSiblingTr.height());
                    }else{
                        $this.val(bigAutocomplete.holdText);//输入框显示用户原始输入的值
                    }
                    
                    break;
                case 27://ESC键隐藏下拉框
                    
                    bigAutocomplete.hideAutocomplete();
                    break;
                }
            });        
            
            //输入框keyup事件
            $this.keyup(function(event) {
                var k = event.keyCode;
                var ctrl = event.ctrlKey;
                var isFunctionalKey = false;//按下的键是否是功能键
                for(var i=0;i<bigAutocomplete.functionalKeyArray.length;i++){
                    if(k == bigAutocomplete.functionalKeyArray[i]){
                        isFunctionalKey = true;
                        break;
                    }
                }
                //k键值不是功能键或是ctrl+c、ctrl+x时才触发自动补全功能
                if(!isFunctionalKey && (!ctrl || (ctrl && k == 67) || (ctrl && k == 88)) ){
                    var config = $this.data("config");
                    
                    var offset = $this.offset();
                    $bigAutocompleteContent.width(config.width);
                    var h = $this.outerHeight() - 1;
                    $bigAutocompleteContent.css({"top":offset.top + h,"left":offset.left});
                    
                    var data = config.data;
                    var url = config.url;
                    var keyword_ = $.trim($this.val());
                    if(keyword_ == null || keyword_ == ""){
                        bigAutocomplete.hideAutocomplete();
                        return;
                    }                    
                    if(data != null && $.isArray(data) ){
                        var data_ = new Array();
                        for(var i=0;i<data.length;i++){
                            if(data[i].title.indexOf(keyword_) > -1){
                                data_.push(data[i]);
                            }
                        }
                        
                        makeContAndShow(data_);
                    }else if(url != null && url != ""){//ajax请求数据
                        $.post(url,{keyword:keyword_},function(result){
                            makeContAndShow(result.data)
                        },"json")
                    }

                    
                    bigAutocomplete.holdText = $this.val();
                }
                //回车键
                if(k == 13){
                    var callback_ = $this.data("config").callback;
                    if($bigAutocompleteContent.css("display") != "none"){
                        if(callback_ && $.isFunction(callback_)){
                            callback_($bigAutocompleteContent.find(".ct").data("jsonData"));
                        }
                        $bigAutocompleteContent.hide();                        
                    }
                }
                
            });    
            
                    
            //组装下拉框html内容并显示
            function makeContAndShow(data_){
                if(data_ == null || data_.length <=0 ){
                    return;
                }
                
                var cont = "<table><tbody>";
                for(var i=0;i<data_.length;i++){
                    cont += "<tr><td><div>" + data_[i].title + "</div></td></tr>"
                }
                cont += "</tbody></table>";
                $bigAutocompleteContent.html(cont);
                $bigAutocompleteContent.show();
                
                //每行tr绑定数据，返回给回调函数
                $bigAutocompleteContent.find("tr").each(function(index){
                    $(this).data("jsonData",data_[index]);
                })
            }            
                    
            
            //输入框focus事件
            $this.focus(function(){
                bigAutocomplete.currentInputText = $this;
            });
            
        }
        //隐藏下拉框
        this.hideAutocomplete = function(){
            var $bigAutocompleteContent = $("#bigAutocompleteContent");
            if($bigAutocompleteContent.css("display") != "none"){
                $bigAutocompleteContent.find("tr").removeClass("ct");
                $bigAutocompleteContent.hide();
            }            
        }
        
    };
    
    
    $.fn.bigAutocomplete = bigAutocomplete.autocomplete;
    
})(jQuery)