jquery+ajax实现输入数据自动补全功能

　　第一步

引用jquery.js,  json2.js IE   低版本需要

<input type="text" runat="server" style="height: 25px; font-size: 12pt;" placeholder="请输入电话号码" id="input_usercode" autocomplete="off" onkeyup="autoComplete.start(event)">
<div class="auto_hidden" id="div_usercodes" style="height: 300px; overflow: auto">
<!--自动完成 DIV-->
</div>

第二步js（后台返回json数据，datatable,list等）

function inputAutoComplete() {
        var content = [];
        $.ajax({
            type: "get",
            url: "/Home/gettel",
            contentType: "application/json",//传值的方式
            success: function (data) {//有了结果
                var datas = JSON.parse(data);// IE8不支持JSON需要下载json2.js
                $.each(datas, function (i, item) {
                    content.push(item.UserCode);
                });
            }
        });
        autoComplete = new AutoComplete('telecode', 'div_usercodes', content);
        //点击是获取数据
        $("#telecode").blur(function () {
           
        })
    }

第三，引用操作js

var Bind = function (object, fun) {
    return function () {
        return fun.apply(object, arguments);
    }
}

function AutoComplete(obj, autoObj, arr) {
    this.obj = document.getElementById(obj);        //输入框
    this.autoObj = document.getElementById(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).offset().left + "px";//this.obj.offsetLeft
        this.autoObj.style.top = $(this.obj).offset().top + this.obj.offsetHeight  + "px"; //this.obj.offsetTop + this.obj.offsetHeight
        this.autoObj.style.width = this.obj.offsetWidth - 2 + "px";//减去边框的长度2px
        //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++;
                }
                if (div_index > 100) break;
            }
        }
        this.pressKey(event);
        window.onresize = Bind(this, function () { this.init(); });
    }
}

第四 引用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;
}

 如果需要根据返回的号码查询其他信息

操作如下

js方法

 function resetTele(tele)

{}

在自动补全 js中找到下面的方法

这个是列表选择时候触发

 setValue: function (_this) {把  _this.obj.value赋值 resetTele( _this.obj.value)就可以了

键盘触发
 changeClassname: function (length) { 同样传 resetTele(this.obj.value) 具体可以js代码调试