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<!doctype html>
<meta charset="utf-8">
<style type="text/css">
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" type="text/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>
<html>
<body>
<div align="center" style="padding-top:50px">
<input type="text" style="width:300px;height:20px;font-size:14pt;" placeholder="请输入a或b模拟效果" 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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原文地址：http://www.cnblogs.com/Tinoloving/p/4667858.html
