一个基于jquery的智能提示控件intellSeach.js

一、需求

　　我们经常会遇到【站内搜索】的需求，为了提高用户体验，我们希望能做到像百度那样的即时智能提示。例如：某公司人事管理系统，想搜索李XX，只要输入“李”，系统自然会提示一些姓李的员工，这样方便用户使用。说白了，就是用户边输入，系统会提示相关的结果；或者，当用户点击搜索框时，就推荐一些内容，如360、百度都会提示今天的主要新闻或搜索量大的内容。

　　jquery 已经有一个这样的插件了，叫 autocomplete, 但我觉得不好用。关于autocomplete的介绍也很多，有兴趣的朋友可以去试试。

　　看标题就知道，这里只是分享一个插件，不会讨论后台搜索的相关算法和过程，也就是说，后台返回特定格式的数据，控件负责渲染结果呈现。ok,先看一下效果图：

　　效果一：

　　

　　效果图二：

　　

　　样式与控件无关，只需要一个 input text 就可以了。

二、参数说明

　　控件以json格式作为传输格式。参数比较多，大部分都有默认值（具体看源码），有些可能不常用，保持默认即可。如下：

　　url: 请求地址。如：Handler.ashx, 后台获取数据的地址

      property: 要显示的json对象的属性。如果我们直接返回["tom","tom cat","tom2"] 这样的形式，那么该属性可以不用设置；但有时候我们会返回[{"Name":"tom","ID":"001"},{"Name":"tom cat","ID":"002"},{"Name":"tom2","ID":"003"}] 这样的形式，显示的是Name，那么设置该属性为"Name"即可。至于我们想在点击的时候获得点击的项的ID,通过点击事件即可。

      itemNumber: 显示的项数目。

      isEmptyRequest: focus时，空白是否发起请求。就像前面说的，如果点击搜索框时(此时没有内容)，想要推荐一些内容，设置该属性为true，即会发起请求。

      defaultValue: 默认值。通常会是：“请输入关键词...” 这类的提示。

      width: 下拉列表宽度。

　　aligner: 要对齐的元素。

      maxHeight: 最大高度。如果设置该高度，超过时就会出现滚动条。                     

      ajax:{
      　　timeout: 超时时间
            cache: 是否缓存
      },       

　　event:{        　　
           setData: 发送请求前触发。用于设置参数
           itemClick: 点击项触发
           enterKeydown: 按下enter键触发
           beforeRender: 所有项呈现前触发
           endRender: 所有项呈现后触发
           itemBeforeRender: 项呈现前触发
           itemAfterRender: 项呈现后触发           
           beforeSend: 发送请求前触发。用户设置请求头部参数等，相当于jquery ajax 的 beforeSend。
     }

 　 event 里的方法都会在适当的时候触发，需要注意的是，所有方法都接收一个参数，该参数是一个对象，有4个属性，某些情况如果没有该属性的，则为空。包括如下属性：

　  jthis: input 的 jQuery 对象。

　  jItem: 项的 jQuery 对象。

     data: 返回的 json 字符串。如果在前台需要对返回 json 再进行处理，那么可以通过 data 属性获得，处理完成后，需要将 json 字符串 return。

 　 event: 事件对象，如按下 enter 时的事件对象。

三、例子

　　使用例子：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

$("#search").intellSearch({     url:"Handler.ashx",     property:"Name",     itemNumber:5,     isEmptyRequest:false,     defaultValue:"请输入关键字...",             width:$("#search").width() + 2,     maxHeight:-1,     event:{         itemClick:function(obj){             alert(obj.item.ID);         },         enterKeydown:function(obj){             if(obj.item){                 alert("有当前项");             }else{                 alert("没有当前项");             }         }     }     });

四、总结　　

　　如果你还有自己的逻辑需要处理，也支持链式调用，大可以这样写 $("#search").intellSearch({参数...}).focus(function(){你的处理...});

　　分享该插件希望能帮助到有需要的朋友，主要用于学习。由于是v1.0，可能还有一些bug，有发现的朋友也可以告诉我，我会及时修正。　　

附源代码

js代码

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332

/*搜索智能提示 v1.0   date:2015.09.08   */ ;(function(w,$){     $.fn.intellSearch = function(options){         var jthis = this;         var _dftOpts = {             url:"",//请求地址或数组                                  property:"",//要显示的json对象的属性             itemNumber:5,//显示的条数             isEmptyRequest:false,//focus空白是否发起请求             defaultValue:"",//默认值             width:0,//列表宽度             aligner:jthis,//要对齐的元素             maxHeight:-1,//最大高度                                  ajax:{                 timeout:3000,//超时时间                 cache:true//是否缓存             },             event:{                 /*参数说明:parameter:{jthis:"jq input",jItem:"jq item",data:"json result",event:"event"}*/                 setData:null,//设置参数                 itemClick:null,//点击项触发                 enterKeydown:null,//按下enter键触发                 beforeRender:null,//所有项呈现前触发                 endRender:null,//所有项呈现后触发                 itemBeforeRender:null,//项呈现前触发                 itemAfterRender:null,//项呈现后触发                 beforeSend:null//发送请求前触发             }         };         $.extend(_dftOpts,options);         if(!_dftOpts.url){             throw Error("url不能为空！");         }         var jResult;                         var _value = "";                 var _ajax = _dftOpts.ajax;         var _event = _dftOpts.event;         var _cache = [];         var _focusCount = 0;//防止focus触发多次(sogou)                    /*on window*/         window.intellObj = window.intellObj || {}; /*for global event*/         window.intellDocumentClick = window.intellDocumentClick || function(e){             if(!window.intellObj.jthis){                 return;             }             if(e.target !== window.intellObj.jthis[0]){                 setIntellObj(null);             }         }         window.intellDocumentKeydown = window.intellDocumentKeydown || function(e){             var jthis = window.intellObj.jthis;             if(!jthis){                 return;             }             var code = e.keyCode;             var value = window.intellObj.value;                         var jResult,jCurItem,keyword;             if(code === 13 || code === 38 || code === 40){                 jResult = window.intellObj.jResult;                 jItems = jResult.find("li");                 jCurItem = jResult.find("li.cur");                 if(code === 13){                     if(jCurItem.length > 0){                         jCurItem.click();                     }else{                         setIntellObj(null);                                                if(_event.enterKeydown){                             _event.enterKeydown({"jthis":jthis,"event":e});                         }                     }                     jthis.blur();                 }else if(jItems.length > 0){                     if(code === 38){                         if(jCurItem.length <= 0){                             jCurItem = jItems.last();                             jCurItem.addClass("cur");                             keyword = jCurItem.text();                         }else{                             var index = jCurItem.index();                             jCurItem.removeClass("cur");                             if(index <= 0){                                 keyword = value;                                                         }else{                                 jCurItem = jItems.eq(index-1);                                 jCurItem.addClass("cur");                                 keyword = jCurItem.text();                             }                         }                         jthis.val(keyword);                     }else{                         if(jCurItem.length <= 0){                             jCurItem = jItems.first();                             jCurItem.addClass("cur");                             keyword = jCurItem.text();                         }else{                             var index = jCurItem.index();                             jCurItem.removeClass("cur");                             if(index + 1 >= jItems.length){                                 keyword = value;                             }else{                                 jCurItem = jItems.eq(index+1);                                 jCurItem.addClass("cur");                                 keyword = jCurItem.text();                             }                         }                         jthis.val(keyword);                     }                 }             }         }         /*event handler*/         $.fn.unintell = function(){             remove();         }         $(document).unbind({click:window.intellDocumentClick,keydown:window.intellDocumentKeydown})                    .bind({click:window.intellDocumentClick,keydown:window.intellDocumentKeydown});         jthis.focus(function(){             _focusCount++;             if(_focusCount > 1){                 return;             }             if(window.intellObj.jthis && jthis !== window.intellObj.jthis){                 setIntellObj(null);             }             var keyword = attrValue();             if(keyword === _dftOpts.defaultValue){                 keyword = "";                 attrValue(keyword);             }             if(keyword || _dftOpts.isEmptyRequest){                 sendRequest();             }         })         jthis.blur(function(){                         _focusCount = 0;             if(!attrValue()){                 attrValue(_dftOpts.defaultValue);             }                     })         jthis.keyup(function(e){             if(e.keyCode === 38 || e.keyCode === 40){                 return;             }             var keyword = attrValue();             if(!keyword){                 remove();                 window.intellObj.value = _value = "";                 return;             }             if(keyword !== _value){                 window.intellObj.value = _value = keyword;                 sendRequest();             }         });                    return initBox();                    /*function*/         function initBox(){             attrValue(_dftOpts.defaultValue);             return jthis;         }                 function initIntell(){                         generate();             register();             setIntellObj({jthis:jthis,jResult:jResult});         }         function generate(){             var offset = _dftOpts.aligner.offset();             var width = _dftOpts.width ? _dftOpts.width : _dftOpts.aligner.width();             jResult = $("<ul>",{"class":"intellResult"});             jResult.width(width).css({"position":"absolute","left":offset.left,"top":offset.top + jthis.outerHeight()});             $("body").append(jResult);             if(_dftOpts.maxHeight > 0){                 jResult.height(_dftOpts.maxHeight).css("overflowY","scroll");             }         }         function remove(){             if(jResult){                 jResult.remove();                 jResult = null;             }         }         function register(){             jResult.on("click","li",function(){                 var jItem = $(this);                 var index = jItem.index();                 var keyword = jItem.text();                 attrValue(keyword);                                 _value = keyword;                                 if(_event.itemClick){                     _event.itemClick({"jthis":jthis,"jItem":jItem,"item":_cache[index]});                 }             }).on("mouseenter","li",function(){                 $(this).siblings("li").removeClass("cur").end().addClass("cur");             }).on("mouseleave","li",function(){                 $(this).removeClass("cur");             });         }         function setIntellObj(obj){             if(!obj){                 if(window.intellObj.jResult){                     window.intellObj.jResult.remove();                 }                 window.intellObj.jthis = null;                 window.intellObj.jResult = null;             }else{                 window.intellObj.jthis = obj.jthis;                 window.intellObj.jResult = obj.jResult;             }         }         function sendRequest(){             var data;             if(_event.setData){                                 data = _event.setData({"jthis":jthis});             }             $.ajax({                 url:_dftOpts.url,                 data:data,                 cache:_ajax.cache,                 timeout:_ajax.timeout,                 beforeSend:function(xhr){                     if(_event.beforeSend){                         _event.beforeSend(xhr);                     }                 },                 success:function(data){                     remove();                     showData(data);                 },                 error:null             });         }         function showData(data){             data = $.trim(data) ? $.parseJSON(data) : data;             if(_event.beforeRender){                 var rs = _event.beforeRender({"jthis":jthis,"data":data});                 if(rs === false){                     return;                 }                 if(rs !== undefined){                     data = rs;                 }             }             if(!data){                 return;             }             var jItem,jA,jSpan,hasProp,item,text,otherTexts,isRender,index;             var list = $.isArray(data) ? data : [data];             var length = list.length;             length = length > _dftOpts.itemNumber ? _dftOpts.itemNumber : list.length;             if(length <= 0){                 return;             }             initIntell();             _cache.length = 0;             hasProp = list[0][_dftOpts.property];             for(var i=0;i<length;i++){                 item = list[i];                 if(item === null || item === undefined){                     continue;                 }                 text = hasProp ? item[_dftOpts.property] : item;                 text = $.trim(text.toString());                 if(text === ""){                     continue;                 }                 jItem = $("<li>",{"class":"intellResult_item"});                 jA = $("<a>",{"title":text}).appendTo(jItem);                 jSpan = $("<span>").appendTo(jA);                 index = text.toLowerCase().indexOf(_value.toLowerCase());                 otherTexts = splitText(text,_value,index);                 if(otherTexts){                     jSpan.text(text.substr(index,_value.length));                     if(otherTexts.length > 1){                         $("<b>",{"text":otherTexts[0]}).insertBefore(jSpan);                         $("<b>",{"text":otherTexts[1]}).insertAfter(jSpan);                     }else{                         if(index === 0){                             $("<b>",{"text":otherTexts[0]}).insertAfter(jSpan);                         }else{                             $("<b>",{"text":otherTexts[0]}).insertBefore(jSpan);                         }                     }                 }else{                     jSpan.text(text);                 }                 isRender = true;                 if(_event.itemBeforeRender){                     isRender = _event.itemBeforeRender({"jthis":jthis,"jItem":jItem,"item":item});                 }                 if(isRender !== false){                     jResult.append(jItem);                     if(_event.itemAfterRender){                         _event.itemAfterRender({"jthis":jthis,"jItem":jItem,"item":item});                     }                 }                 _cache.push(item);             }             if(_event.endRender){                 _event.endRender({"jthis":jthis});             }             jResult.show();         }         function attrValue(value){             if(!value && value != ""){                 return $.trim(jthis.val());             }             jthis.val(value);         }         function splitText(text,value,index){             var tlength = text.length;             var vlength = value.length;             if(index === -1){                 return null;             }             if(index === 0){                 if(index + vlength >= tlength){                     return null;                 }                 return [text.substr(index + vlength)];             }             if(index + vlength >= tlength){                 return [text.substr(0,index)];             }             return [text.substr(0,index),text.substr(index + vlength)];         }     } })(window,jQuery);

样式

?

1 2 3

.intellResult{margin:0;padding:0;background:#fff;border:1px solid #b6b6b6;clear:both;z-index:999;display:none;} .intellResult li{margin:0;padding:0;padding:5px 15px;height:20px;line-height:20px;overflow:hidden;text-overflow:ellipsis;cursor:pointer;white-space:nowrap;} .intellResult li.cur{background:#E5E0E0;}

一个基于jquery的智能提示控件intellSeach.js

标签：

原文地址：http://www.cnblogs.com/armyfai/p/4793667.html