<!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>;
js自动补全
原文地址：http://www.cnblogs.com/upup2015/p/7782629.html