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Jquery实现仿搜索引擎文本框自动补全插件

Jquery实现仿搜索引擎文本框自动补全插件功能很实用，使用也很简单，引入了插件之后写几行代码就可以实现，可以灵活设置 //width:下拉框的宽度，默认使用输入框宽度、用来ajax后台获取数据，返回的数据格式为data参数一样、数据格式{data: [{title:null,result:{}},{title:null,result:{}}]}url和data参数只有一个生效，data优先、 选中行后按回车或单击时回调的函数

 

效果如下：

Jquery插件,Jquery资源,Jquery特效,div+css

在线演示和下载请查看：
http://www.jq-school.com/Detail.aspx?id=36

标签： jQuery

代码片段(1)

[代码] [JavaScript]代码

001 (function($){

 

002     var bigAutocomplete = new function(){

 

003         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）

 

004         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

 

005         this.holdText = null;//输入框中原始输入的内容

 

006          

 

007         //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

 

008         this.init = function(){

 

009             $("body").append("<div id='bigAutocompleteContent' class='bigautocomplete-layout'></div>");

 

010             $(document).bind('mousedown',function(event){

 

011                 var $target = $(event.target);

 

012                 if((!($target.parents().andSelf().is('#bigAutocompleteContent'))) && (!$target.is(bigAutocomplete.currentInputText))){

 

013                     bigAutocomplete.hideAutocomplete();

 

014                 }

 

015             })

 

016              

 

017             //鼠标悬停时选中当前行

 

018             $("#bigAutocompleteContent").delegate("tr", "mouseover", function() {

 

019                 $("#bigAutocompleteContent tr").removeClass("ct");

 

020                 $(this).addClass("ct");

 

021             }).delegate("tr", "mouseout", function() {

 

022                 $("#bigAutocompleteContent tr").removeClass("ct");

 

023             });    

 

024              

 

025              

 

026             //单击选中行后，选中行内容设置到输入框中，并执行callback函数

 

027             $("#bigAutocompleteContent").delegate("tr", "click", function() {

 

028                 bigAutocomplete.currentInputText.val( $(this).find("div:last").html());

 

029                 var callback_ = bigAutocomplete.currentInputText.data("config").callback;

 

030                 if($("#bigAutocompleteContent").css("display") != "none" && callback_ && $.isFunction(callback_)){

 

031                     callback_($(this).data("jsonData"));

 

032                      

 

033                 }              

 

034                 bigAutocomplete.hideAutocomplete();

 

035             })         

 

036              

 

037         }

 

038          

 

039         this.autocomplete = function(param){

 

040              

 

041             if($("body").length > 0 && $("#bigAutocompleteContent").length <= 0){

 

042                 bigAutocomplete.init();//初始化信息

 

043             }          

 

044              

 

045             var $this = $(this);//为绑定自动补全功能的输入框jquery对象

 

046              

 

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

 

048              

 

049             this.config = {

 

050                            //width:下拉框的宽度，默认使用输入框宽度

 

051                            width:$this.outerWidth() - 2,

 

052                            //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

 

053                            url:null,

 

054                            /*data：格式{data:[{title:null,result:{}},{title:null,result:{}}]}

 

055                            url和data参数只有一个生效，data优先*/

 

056                            data:null,

 

057                            //callback：选中行后按回车或单击时回调的函数

 

058                            callback:null};

 

059             $.extend(this.config,param);

 

060              

 

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

 

062              

 

063             //输入框keydown事件

 

064             $this.keydown(function(event) {

 

065                 switch (event.keyCode) {

 

066                 case 40://向下键

 

067                      

 

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

 

069                      

 

070                     var $nextSiblingTr = $bigAutocompleteContent.find(".ct");

 

071                     if($nextSiblingTr.length <= 0){//没有选中行时，选中第一行

 

072                         $nextSiblingTr = $bigAutocompleteContent.find("tr:first");

 

073                     }else{

 

074                         $nextSiblingTr = $nextSiblingTr.next();

 

075                     }

 

076                     $bigAutocompleteContent.find("tr").removeClass("ct");

 

077                      

 

078                     if($nextSiblingTr.length > 0){//有下一行时（不是最后一行）

 

079                         $nextSiblingTr.addClass("ct");//选中的行加背景

 

080                         $this.val($nextSiblingTr.find("div:last").html());//选中行内容设置到输入框中

 

081                          

 

082                         //div滚动到选中的行,jquery-1.6.1 $nextSiblingTr.offset().top 有bug，数值有问题

 

083                         $bigAutocompleteContent.scrollTop($nextSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $nextSiblingTr.height() );

 

084                          

 

085                     }else{

 

086                         $this.val(bigAutocomplete.holdText);//输入框显示用户原始输入的值

 

087                     }

 

088                      

 

089                      

 

090                     break;

 

091                 case 38://向上键

 

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

 

093                      

 

094                     var $previousSiblingTr = $bigAutocompleteContent.find(".ct");

 

095                     if($previousSiblingTr.length <= 0){//没有选中行时，选中最后一行行

 

096                         $previousSiblingTr = $bigAutocompleteContent.find("tr:last");

 

097                     }else{

 

098                         $previousSiblingTr = $previousSiblingTr.prev();

 

099                     }

 

100                     $bigAutocompleteContent.find("tr").removeClass("ct");

 

101                      

 

102                     if($previousSiblingTr.length > 0){//有上一行时（不是第一行）

 

103                         $previousSiblingTr.addClass("ct");//选中的行加背景

 

104                         $this.val($previousSiblingTr.find("div:last").html());//选中行内容设置到输入框中

 

105                          

 

106                         //div滚动到选中的行,jquery-1.6.1 $$previousSiblingTr.offset().top 有bug，数值有问题

 

107                         $bigAutocompleteContent.scrollTop($previousSiblingTr[0].offsetTop - $bigAutocompleteContent.height() + $previousSiblingTr.height());

 

108                     }else{

 

109                         $this.val(bigAutocomplete.holdText);//输入框显示用户原始输入的值

 

110                     }

 

111                      

 

112                     break;

 

113                 case 27://ESC键隐藏下拉框

 

114                      

 

115                     bigAutocomplete.hideAutocomplete();

 

116                     break;

 

117                 }

 

118             });    

 

119              

 

120             //输入框keyup事件

 

121             $this.keyup(function(event) {

 

122                 var k = event.keyCode;

 

123                 var ctrl = event.ctrlKey;

 

124                 var isFunctionalKey = false;//按下的键是否是功能键

 

125                 for(var i=0;i<bigAutocomplete.functionalKeyArray.length;i++){

 

126                     if(k == bigAutocomplete.functionalKeyArray[i]){

 

127                         isFunctionalKey = true;

 

128                         break;

 

129                     }

 

130                 }

 

131                 //k键值不是功能键或是ctrl+c、ctrl+x时才触发自动补全功能

 

132                 if(!isFunctionalKey && (!ctrl || (ctrl && k == 67) || (ctrl && k == 88)) ){

 

133                     var config = $this.data("config");

 

134                      

 

135                     var offset = $this.offset();

 

136                     $bigAutocompleteContent.width(config.width);

 

137                     var h = $this.outerHeight() - 1;

 

138                     $bigAutocompleteContent.css({"top":offset.top + h,"left":offset.left});

 

139                      

 

140                     var data = config.data;

 

141                     var url = config.url;

 

142                     var keyword_ = $.trim($this.val());

 

143                     if(keyword_ == null || keyword_ == ""){

 

144                         bigAutocomplete.hideAutocomplete();

 

145                         return;

 

146                     }                  

 

147                     if(data != null && $.isArray(data) ){

 

148                         var data_ = new Array();

 

149                         for(var i=0;i<data.length;i++){

 

150                             if(data[i].title.indexOf(keyword_) > -1){

 

151                                 data_.push(data[i]);

 

152                             }

 

153                         }

 

154                          

 

155                         makeContAndShow(data_);

 

156                     }else if(url != null && url != ""){//ajax请求数据

 

157                         $.post(url,{keyword:keyword_},function(result){

 

158                             makeContAndShow(result.data)

 

159                         },"json")

 

160                     }

 

161  

 

162                      

 

163                     bigAutocomplete.holdText = $this.val();

 

164                 }

 

165                 //回车键

 

166                 if(k == 13){

 

167                     var callback_ = $this.data("config").callback;

 

168                     if($bigAutocompleteContent.css("display") != "none"){

 

169                         if(callback_ && $.isFunction(callback_)){

 

170                             callback_($bigAutocompleteContent.find(".ct").data("jsonData"));

 

171                         }

 

172                         $bigAutocompleteContent.hide();                    

 

173                     }

 

174                 }

 

175                  

 

176             });

 

177              

 

178                      

 

179             //组装下拉框html内容并显示

 

180             function makeContAndShow(data_){

 

181                 if(data_ == null || data_.length <=0 ){

 

182                     return;

 

183                 }

 

184                  

 

185                 var cont = "<table><tbody>";

 

186                 for(var i=0;i<data_.length;i++){

 

187                     cont += "<tr><td><div>" + data_[i].title + "</div></td></tr>"

 

188                 }

 

189                 cont += "</tbody></table>";

 

190                 $bigAutocompleteContent.html(cont);

 

191                 $bigAutocompleteContent.show();

 

192                  

 

193                 //每行tr绑定数据，返回给回调函数

 

194                 $bigAutocompleteContent.find("tr").each(function(index){

 

195                     $(this).data("jsonData",data_[index]);

 

196                 })

 

197             }          

 

198                      

 

199              

 

200             //输入框focus事件

 

201             $this.focus(function(){

 

202                 bigAutocomplete.currentInputText = $this;

 

203             });

 

204              

 

205         }

 

206         //隐藏下拉框

 

207         this.hideAutocomplete = function(){

 

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

 

209             if($bigAutocompleteContent.css("display") != "none"){

 

210                 $bigAutocompleteContent.find("tr").removeClass("ct");

 

211                 $bigAutocompleteContent.hide();

 

212             }          

 

213         }

 

214          

 

215     };

 

216      

 

217      

 

218     $.fn.bigAutocomplete = bigAutocomplete.autocomplete;

 

219      

 

220 })(jQuery)

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