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：

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$("#search").intellSearch({     url:"Handler.ashx",     property:"Name",     itemNumber:5,     isEmptyRequest:false,     defaultValue:"请输入关键字...",             width:$("#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

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/*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

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.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;}