js自动补全

<!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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