原生js的自动补全，不依赖jquery,样式大家可以自己根据自己的需要修改，以下供大家参考 点击下载案例代码
<!doctype html> <html> <meta charset="utf-8"> <!--=================== 封装开始 ======================--> <!--样式--> <style> .auto_hidden { width:204px;border-top: 1px solid #333; border-bottom: 1px solid #333; border-left: 1px solid #333; border-right: 1px solid #333; position:absolute; display:none; } .auto_show { width:204px; border-top: 1px solid #333; border-bottom: 1px solid #333; border-left: 1px solid #333; border-right: 1px solid #333; position:absolute; z-index:9999; /* 设置对象的层叠顺序 */ display:block; } .auto_onmouseover{ color:#ffffff; background-color:highlight; width:100%; } .auto_onmouseout{ color:#000000; width:100%; background-color:#ffffff; } </style> <!--js文件--> <script language="javascript"> var $id = function (id) { return "string" == typeof id ? document.getElementById(id) : id; } var Bind = function(object, fun) { return function() { return fun.apply(object, arguments); } } function AutoComplete(obj,arr){ this.obj=$id(obj);//输入框 var autodiv = document.createElement("div");//创建一个元素节点,自动完成DIV autodiv.setAttribute("id","autoComplete_div");//设置元素id autodiv.setAttribute("class","auto_hidden");//设置元素class this.after(autodiv);//在当前元素后面追加 this.autoObj=$id("autoComplete_div");//DIV的根节点 this.value_arr=arr; //不要包含重复值 this.index=-1; //当前选中的DIV的索引 this.search_value=""; //保存当前搜索的字符 this.start();//调用程序入口方法 } AutoComplete.prototype={ init: function(){//初始化DIV的位置 this.autoObj.style.left = this.obj.offsetLeft + "px"; this.autoObj.style.top = this.obj.offsetTop + this.obj.offsetHeight + "px"; this.autoObj.style.width= this.obj.offsetWidth - 2 + "px";//减去边框的长度2px },deleteDIV: function(){//删除自动完成需要的所有DIV while(this.autoObj.hasChildNodes()){ this.autoObj.removeChild(this.autoObj.firstChild); } this.autoObj.className="auto_hidden"; },setValue: function(_this){//设置值 return function(){ _this.obj.value=this.seq; _this.autoObj.className="auto_hidden"; } },autoOnmouseover: function(_this,_div_index){//模拟鼠标移动至DIV时,DIV高亮 return function(){ _this.index=_div_index; var length = _this.autoObj.children.length; for(var j=0;j<length;j++){ if(j!=_this.index ){ _this.autoObj.childNodes[j].className='auto_onmouseout'; }else{ _this.autoObj.childNodes[j].className='auto_onmouseover'; } } } },changeClassname: function(length){//更改classname for(var i=0;i<length;i++){ if(i!=this.index ){ this.autoObj.childNodes[i].className='auto_onmouseout'; }else{ this.autoObj.childNodes[i].className='auto_onmouseover'; this.obj.value=this.autoObj.childNodes[i].seq; } } },pressKey: function(event){//响应键盘 var length = this.autoObj.children.length; if(event.keyCode==40){//光标键"↓" ++this.index; if(this.index>length){ this.index=0; }else if(this.index==length){ this.obj.value=this.search_value; } this.changeClassname(length); }else if(event.keyCode==38){//光标键"↑" this.index--; if(this.index<-1){ this.index=length - 1; }else if(this.index==-1){ this.obj.value=this.search_value; } this.changeClassname(length); }else if(event.keyCode==13){//回车键 this.autoObj.className="auto_hidden"; this.index=-1; }else{ this.index=-1; } },after:function (newElement){//newElement是要追加的元素 var parent = this.obj.parentNode;//找到当前元素的父节点 if( parent.lastChild == this.obj ){//判断当前元素是否是节点中的最后一个位置,如果是的话就直接使用appendChild方法 parent.appendChild(newElement,this.obj ); }else{ parent.insertBefore(newElement,this.obj.nextSibling ); }; },start: function(){//程序入口 var thisObj=this; thisObj.obj.onkeyup=function(event){ if(event.keyCode!=13&&event.keyCode!=38&&event.keyCode!=40){ thisObj.init(); thisObj.deleteDIV(); thisObj.search_value=thisObj.obj.value; var valueArr=thisObj.value_arr; valueArr.sort(); if(thisObj.obj.value.replace(/(^\s*)|(\s*$)/g,'')==""){ return; }//值为空,退出 try{ var reg = new RegExp("(" + thisObj.obj.value + ")","i"); }catch (e){ return; } var div_index=0;//记录创建的DIV的索引 for(var i=0;i<valueArr.length;i++){ if(reg.test(valueArr[i])){ var div = document.createElement("div"); div.className="auto_onmouseout"; div.seq=valueArr[i]; div.onclick=thisObj.setValue(thisObj); div.onmouseover=thisObj.autoOnmouseover(thisObj,div_index); div.innerHTML=valueArr[i].replace(reg,"<strong>$1</strong>");//搜索到的字符粗体显示 thisObj.autoObj.appendChild(div); thisObj.autoObj.className="auto_show"; div_index++; } } } thisObj.pressKey(event); window.onresize=Bind(thisObj,function(){thisObj.init();}); }; } } </script> <!--=================== 封装结束 ======================--> <!--========================== 调用开始 =========================--> <body> <!--第一个自动补全--> <input type="text" placeholder="请输入a或b模拟效果" id="o" > <!--第二个自动补全--> <input type="text" placeholder="请输入或2模拟效果" id="o1" > <script> //实例化第一个自动补全,参数一 为元素id,参数二 为数据 new AutoComplete('o',['b0','b12','b22','b3','b4','b5','b6','b7','b8','b2','abd','ab','acd','accd','b1','cd','ccd','cbcv','cxf']); //实例化第二个自动补全,参数一 为元素id,参数二 为数据 new AutoComplete('o1',[,'22','33','13','123','1221','23','234','256','s2','12s','12sfd','1346','a22d','b2','2cd','c1cd','cb1cv']); </script> </body> <!--========================== 调用结束 =========================--> </html>效果如下：
