用js实现输入提示(自动完成)的实例代码

代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>autoComplete</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
.autoComplete {margin:8px;position:relative;float:left;}
.autoComplete input {width:200px;height:25px;margin:0;padding:0;line-height:25px;}
.autoComplete ul {z-index:-12;padding:0px;margin:0px;border:1px #333 solid;width:200px;background:white;display:none;position:absolute;left:0;top:28px;*margin-left:9px;*margin-top:2px;margin-top:1px;}
.autoComplete li {list-style:none;}
.autoComplete li a {display:block;color:#000;text-decoration:none;padding:1px 0 1px 5px;_width:97%;}
.autoComplete li a:hover {color:#000;background:#ccc;border:none;}
</style>
<script type="text/javascript">
//<![CDATA[
var getElementsByClassName = function (searchClass, node, tag) {/* 兼容各浏览器的选择class的方法；(：http://www.jb51.net，想了解更多请看这个地址) */
    node = node || document, tag = tag ? tag.toUpperCase() : "*";
    if(document.getElementsByClassName){/* 支持getElementsByClassName的浏览器 */
        var temp = node.getElementsByClassName(searchClass);
        if(tag=="*"){
            return temp;
        } else {
            var ret = new Array();
            for(var i=0; i<temp.length; i++)
                if(temp[i].nodeName==tag)
                    ret.push(temp[i]);
            return ret;
        }
    }else{/* 不支持getElementsByClassName的浏览器 */
        var classes = searchClass.split(" "),
            elements = (tag === "*" && node.all)? node.all : node.getElementsByTagName(tag),
            patterns = [], returnElements = [], current, match;
        var i = classes.length;
        while(--i >= 0)
            patterns.push(new RegExp("(^|s)" + classes[i] + "(s|$)"));
        var j = elements.length;
        while(--j >= 0){
            current = elements[j], match = false;
            for(var k=0, kl=patterns.length; k<kl; k++){
                match = patterns[k].test(current.className);
                if(!match) break;
            }
            if(match) returnElements.push(current);
        }
        return returnElements;
    }
};
var addEvent=(function(){/* 用此函数添加事件防止事件覆盖 */
    if(document.addEventListener){
        return function(type, fn){ this.addEventListener(type, fn, false); };
    }else if(document.attachEvent){
        return function(type,fn){
            this.attachEvent(on+type, function () {
                return fn.call(this, window.event);/* 兼容IE */
            });
        };
    }
})();
;(function(window){
/* 插件开始 */
var autoComplete=function(o){
    var handler=(function(){
        var handler=function(e,o){ return new handler.prototype.init(e,o); };/* 为每个选择的dom都创建一个相对应的对象，这样选择多个dom时可以很方便地使用 */
        handler.prototype={
            e:null, o:null, timer:null, show:0, input:null, popup:null,
            init:function(e,o){/* 设置初始对象 */
                this.e=e, this.o=o,
                this.input=this.e.getElementsByTagName(this.o.input)[0],
                this.popup=this.e.getElementsByTagName(this.o.popup)[0],
                this.initEvent();/* 初始化各种事件 */
            },
            match:function(quickExpr,value,source){/* 生成提示 */
                var li = null;
                for(var i in source){
                    if( value.length>0 && quickExpr.exec(source[i])!=null ){
                        li = document.createElement(li);
                        li.innerHTML = <a href="javascript:;">+source[i]+</a>;
                        this.popup.appendChild(li);
                    }
                }
                if(this.popup.getElementsByTagName(a).length)
                    this.popup.style.display=block;
                else
                    this.popup.style.display=none;
            },
         &n