dwr实现搜索自动补全功能（键盘鼠标均可，类似百度）
上段时间想做一个百度等搜索自动提示补全的功能。于是从网上弄了点资料实现了第一个版本，但光标事件没有实现。于是又从网上弄了点资料，这个版本的作者我记不清楚了，对他说声对不起，由于这个版本的数据是在页面上写的死数据，所以个人把这个地方改成用DWR从后台取的数据，数据封装形式为List<javaBean>。修改后完成鼠标，方向键，ESC键以及失去焦点后所有的功能。程序中你也可以把AutoComplete类修改成两个参数的类，我这里还是沿用三个参数，初始化时只是随便给了一条数据，真正的数据是从后台刷出来的。当然也可以把取数据的改成AJAX等其他方式。效果图如下：
以下是代码：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><script type='text/javascript' src="<c:url value='/dwr/interface/SearchAuto.js'/>"></script> <script type='text/javascript' src="<c:url value='/dwr/engine.js'/>"></script><script type='text/javascript' src="<c:url value='/dwr/util.js'/>"></script><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><script type="text/javascript">//验证function validate(){ var key = document.getElementById("key").value; if(key ==""){ alert("请输入检索内容！"); return false; } return true; }</script><script language="javascript"><!--/*通用: 自动补全(仿百度搜索框)*/var get$ = 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,autoObj,arr){ this.obj=get$(obj); //输入框 this.autoObj=get$(autoObj);//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}AutoComplete.prototype={ //初始化DIV的位置 init: function(){ 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 }, //删除自动完成需要的所有DIV deleteDIV: function(){ while(this.autoObj.hasChildNodes()){ this.autoObj.removeChild(this.autoObj.firstChild); } this.autoObj.className="auto_hidden"; }, //设置值 setValue: function(_this){ return function(){ _this.obj.value=this.seq; _this.autoObj.className="auto_hidden"; } }, //模拟鼠标移动至DIV时，DIV高亮 autoOnmouseover: function(_this,_div_index){ 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'; } } } }, //更改classname changeClassname: function(length){ 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; } } } , //响应键盘 pressKey: function(event){ var length = this.autoObj.children.length; //ESC键 if(event.keyCode == 27){ document.getElementById("auto").className="auto_hidden"; } //光标键"↓" if(event.keyCode==40){ ++this.index; if(this.index>length){ this.index=0; }else if(this.index==length){ this.obj.value=this.search_value; } this.changeClassname(length); } //光标键"↑" else if(event.keyCode==38){ this.index--; if(this.index<-1){ this.index=length - 1; }else if(this.index==-1){ this.obj.value=this.search_value; } this.changeClassname(length); } //回车键 else if(event.keyCode==13){ this.autoObj.className="auto_hidden"; this.index=-1; }else{ this.index=-1; } }, //程序入口 start: function(event){ //取数据 var data = new Array() ; var key = document.getElementById('key').value; if(key != null && key.trim() !=""){ DWREngine.setAsync(false); SearchAuto.getResourcesInfoByDwr(key,{ callback:function callback(msg){ //调用单独的回调函数 for(var i = 0 ;i<msg.length;i++){ data.push(msg[i].erinName); } }, errorHandler:function errors(){ //do nothing } }); DWREngine.setAsync(true); } this.value_arr=data; //数据变化时重新赋值 //键盘 if(event.keyCode!=13&&event.keyCode!=38&&event.keyCode!=40){ this.init(); this.deleteDIV(); this.search_value=this.obj.value; var valueArr=this.value_arr; valueArr.sort(); if(this.obj.value.replace(/(^\s*)|(\s*$)/g,'')==""){ return; }//值为空，退出 try{ var reg = new RegExp("(" + this.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=this.setValue(this); div.onmouseover=this.autoOnmouseover(this,div_index); div.innerHTML=valueArr[i].replace(reg,"<strong>$1</strong>");//搜索到的字符粗体显示 this.autoObj.appendChild(div); this.autoObj.className="auto_show"; div_index++; } } } this.pressKey(event); window.onresize=Bind(this,function(){this.init();}); }} //失去焦点时关闭提示框 document.onclick = function(e) { var event = window.event || e; var ele = event.srcElement || event.target; if(ele.id != "autoComplete" && ele.id !="key"){ document.getElementById("auto").className="auto_hidden"; } }//--></SCRIPT><form id="form1" name="form1" method="post" action="search/hibernateSearch.htm?action=searchAllResources" onsubmit="return validate();"> <div name="type" value="0" />全部 <input type="radio" name="type" value="1" />作者 <input type="radio" name="type" value="2" checked="checked"/>书名</div><div name="key" id="key" value="${key }" onkeyup="autoComplete.start(event);" autocomplete="off"/> <input type="submit" name="Submit" value="" ></div> <a href="search/hibernateSearch.htm?action=advancedSearchForward" title="高级检索">高级检索</a></div><script> var autoComplete = new AutoComplete('key','auto',['1','11']); </SCRIPT></form>