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输入框自动填充效果 js

 
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    <!doctype html>
    <html>
    <style>
    body {
        margin-left: 0px;
        margin-top: 0px;
        margin-right: 0px;
        margin-bottom: 0px;
    }
    .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 language="javascript">
    var $ = 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=$(obj);        //输入框
        this.autoObj=$(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;
            //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){
            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();});
        }
    }
    //-->
    </SCRIPT>
    <body>
    <h1 align="center">自动完成函数(Autocomplete Function)</h1>
        <div align="center"><input type="text" style="width:300px;height:20px;font-size:14pt;" id="o" onkeyup="autoComplete.start(event)"></div>
        <div class="auto_hidden" id="auto"><!--自动完成 DIV--></div>
    <script>
        var autoComplete=new AutoComplete('o','auto',['b0','b12','b22','b3','b4','b5','b6','b7','b8','b2','abd','ab','acd','accd','b1','cd','ccd','cbcv','cxf']);
    </SCRIPT>
    </body>
    </html>

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