Jquery實現仿搜索引擎文本框自動補全插件

Jquery實現仿搜索引擎文本框自動補全插件功能很實用，使用也很簡單，引入了插件之后寫幾行代碼就可以實現，可以靈活設置 //width:下拉框的寬度，默認使用輸入框寬度、用來ajax后臺獲取數據，返回的數據格式為data參數一樣、數據格式{data:[{title:null,result:{}},{title:null,result:{}}]}url和data參數只有一個生效，data優先、選中行后按回車或單擊時回調的函數

 

效果如下：

插件代碼如下：

(function($){
    var bigAutocomplete = new function(){
        this.currentInputText = null;//目前獲得光標的輸入框（解決一個頁面多個輸入框綁定自動補全功能）
        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];//鍵盤上功能鍵鍵值數組
        this.holdText = null;//輸入框中原始輸入的內容

        //初始化插入自動補全div，并在document注冊mousedown，點擊非div區域隱藏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();
                }
            })

            //鼠標懸停時選中當前行
            $("#bigAutocompleteContent").delegate("tr", "mouseover", function() {
                $("#bigAutocompleteContent tr").removeClass("ct");
                $(this).addClass("ct");
            }).delegate("tr", "mouseout", function() {
                $("#bigAutocompleteContent tr").removeClass("ct");
            });     


            //單擊選中行后，選中行內容設置到輸入框中，并執行callback函數
            $("#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);//為綁定自動補全功能的輸入框jquery對象

            var $bigAutocompleteContent = $("#bigAutocompleteContent");

            this.config = {
                           //width:下拉框的寬度，默認使用輸入框寬度
                           width:$this.outerWidth() - 2,
                           //url：格式url:""用來ajax后臺獲取數據，返回的數據格式為data參數一樣
                           url:null,
                           /*data：格式{data:[{title:null,result:{}},{title:null,result:{}}]}
                           url和data參數只有一個生效，data優先*/
                           data:null,
                           //callback：選中行后按回車或單擊時回調的函數
                           callback:null};
            $.extend(this.config,param);

            $this.data("config",this.config);

            //輸入框keydown事件
            $this.keydown(function(event) {
                switch (event.keyCode) {
                case 40://向下鍵

                    if($bigAutocompleteContent.css("display") == "none")return;

                    var $nextSiblingTr = $bigAutocompleteContent.find(".ct");
                    if($nextSiblingTr.length <= 0){//沒有選中行時，選中第一行
                        $nextSiblingTr = $bigAutocompleteContent.find("tr:first");
                    }else{
                        $nextSiblingTr = $nextSiblingTr.next();
                    }
                    $bigAutocompleteContent.find("tr").removeClass("ct");

                    if($nextSiblingTr.length > 0){//有下一行時（不是最后一行）
                        $nextSiblingTr.addClass("ct");//選中的行加背景
                        $this.val($nextSiblingTr.find("div:last").html());//選中行內容設置到輸入框中

                        //div滾動到選中的行,jquery-1.6.1 $nextSiblingTr.offset().top 有bug，數值有問題
                        $bigAutocompleteContent.scrollTop($nextSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $nextSiblingTr.height() );

                    }else{
                        $this.val(bigAutocomplete.holdText);//輸入框顯示用戶原始輸入的值
                    }


                    break;
                case 38://向上鍵
                    if($bigAutocompleteContent.css("display") == "none")return;

                    var $previousSiblingTr = $bigAutocompleteContent.find(".ct");
                    if($previousSiblingTr.length <= 0){//沒有選中行時，選中最后一行行
                        $previousSiblingTr = $bigAutocompleteContent.find("tr:last");
                    }else{
                        $previousSiblingTr = $previousSiblingTr.prev();
                    }
                    $bigAutocompleteContent.find("tr").removeClass("ct");

                    if($previousSiblingTr.length > 0){//有上一行時（不是第一行）
                        $previousSiblingTr.addClass("ct");//選中的行加背景
                        $this.val($previousSiblingTr.find("div:last").html());//選中行內容設置到輸入框中

                        //div滾動到選中的行,jquery-1.6.1 $$previousSiblingTr.offset().top 有bug，數值有問題
                        $bigAutocompleteContent.scrollTop($previousSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $previousSiblingTr.height());
                    }else{
                        $this.val(bigAutocomplete.holdText);//輸入框顯示用戶原始輸入的值
                    }

                    break;
                case 27://ESC鍵隱藏下拉框

                    bigAutocomplete.hideAutocomplete();
                    break;
                }
            });     

            //輸入框keyup事件
            $this.keyup(function(event) {
                var k = event.keyCode;
                var ctrl = event.ctrlKey;
                var isFunctionalKey = false;//按下的鍵是否是功能鍵
                for(var i=0;i<bigAutocomplete.functionalKeyArray.length;i++){
                    if(k == bigAutocomplete.functionalKeyArray[i]){
                        isFunctionalKey = true;
                        break;
                    }
                }
                //k鍵值不是功能鍵或是ctrl+c、ctrl+x時才觸發自動補全功能
                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請求數據
                        $.post(url,{keyword:keyword_},function(result){
                            makeContAndShow(result.data)
                        },"json")
                    }


                    bigAutocomplete.holdText = $this.val();
                }
                //回車鍵
                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();                     
                    }
                }

            }); 


            //組裝下拉框html內容并顯示
            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綁定數據，返回給回調函數
                $bigAutocompleteContent.find("tr").each(function(index){
                    $(this).data("jsonData",data_[index]);
                })
            }           


            //輸入框focus事件
            $this.focus(function(){
                bigAutocomplete.currentInputText = $this;
            });

        }
        //隱藏下拉框
        this.hideAutocomplete = function(){
            var $bigAutocompleteContent = $("#bigAutocompleteContent");
            if($bigAutocompleteContent.css("display") != "none"){
                $bigAutocompleteContent.find("tr").removeClass("ct");
                $bigAutocompleteContent.hide();
            }           
        }

    };


    $.fn.bigAutocomplete = bigAutocomplete.autocomplete;

})(jQuery)

項目主頁：http://www.baiduhome.net/lib/view/home/1344491672952