input输入框联想功能

一直想找一个可以连接后台，可以根据后台内容的input输入框，可以实现联想功能，网上找到一个简单的静态页面的输入框联想，经过一番修改之后终于可以实现读取自己定义的数组的联想了，其实也比较简单就是格式的问题。还是直接上代码吧。

首先是一个简单的界面

auto.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>input自动补全</title>
    <link rel="stylesheet" type="text/css" href="auto.css" />
</head>

<body>
    <div class="wrap">
        <input type="text" id="input" class="auto-inp">
        <div class="auto hidden" id="auto">
            <div class="auto_out">1</div>
            <div class="auto_out">2</div>
        </div>
    </div>
    <%String[] a = {"a12","124","15"}; 
    out.print(a[1]);
    %>
 
    <script src="auto.js"></script>
    <script>
    
        //var array = ['b12','b22','固戍','b4','b5','b6','如果爱','b7','b8','b2','abd','ab','西乡','accd','abd','qq音乐','b1','cd','ccd','cbcv','小王子','cxf','b0'];
        var array=[
            <%for(int i = 0 ; i < a.length;i++)
            {
                %>
                '<%=a[i]%>',   //一定要加上单引号
                <%
            }
            %>
        ]
        var autoComplete = new AutoComplete("input","auto",array);
        document.getElementById("input").onkeyup = function(event){
            autoComplete.start(event);
        }
    </script>
</body>
</html>

为了实现联想的内容是自己程序里的数组，我用了一个循环，将java中的数组添加到了js中，改了好长时间，后来才想到，对于js数组中还有其固定的格式，加了一个‘ <%=a[]%>’号之后就成了

然后对界面进行设计

auto.css

div,p,h1,h2,h3,h4,h5,h6,ul,li,span,input{
    box-sizing: border-box;
    font: 14px/20px "microsoft yahei";
}
div.wrap{
     240px;
    margin: 20px auto 0 auto;
}
.auto-inp{
     240px;
    height: 36px;
    padding-left: .5em;
    border-radius: 2px;
    border: 1px solid #dedede;
    color: #666;
    outline: none;
}
.auto{
     240px;
    border: 1px solid #dedede;
    border-top: none;
    position: absolute;
}
.auto_out{
     238px;
    height: 36px;
    line-height: 36px;
    padding-left: .5em;
    color: #000;
    background: #fff;
    overflow: hidden;
    white-space: nowrap;
    -o-text-overflow: ellipsis;
    text-overflow: ellipsis;
}
.auto_out.on{
    background: #eee;
    cursor: pointer;
}
.hidden{
    display: none;
}

然后就是主要起作用的部分了

auto.js:

// 数组去重
Array.prototype.unique = function(){
    this.sort();
    var res = [];
    var json = {};
    for (var i = 0; i < this.length; i++) {
        if(!json[this[i]]){
            res.push(this[i]);
            json[this[i]] = 1;
        }
    }
    return res;
}
 
// 对样式操作
var setClass = {
    hasClass: function(elements,cName){    // 判断是否含有某个class
        if(elements.className.match(new RegExp( "(\s|^)" + cName + "(\s|$)") ))
            return true;
        else
            return false;
    },
    addClass: function(elements,cName){    // 添加class
        if( !this.hasClass( elements,cName ) ){ 
            elements.className += " " + cName; 
        };
    },
    removeClass: function(elements,cName){    // 移除某个class
        if( this.hasClass( elements,cName ) ){ 
            elements.className = elements.className.replace( new RegExp( "(\s|^)" + cName + "(\s|$)" )," " ); 
        }
    }
}
 
var Bind = function(This){
    return function(){
        This.init();
    }
}
 
function AutoComplete(input,auto,arr) {
    this.obj = document.getElementById(input);
    this.autoObj = document.getElementById(auto);
    this.search_value = "";    //当前的搜索输入值
    this.index = -1;        //当前选中的DIV的索引
    this.value_arr = arr;    //数据库中供检索的值 不包含重复值
}
AutoComplete.prototype = {
    // 初始化
    init: function(){
        var This = this;
        setClass.removeClass(This.autoObj,"hidden");
        this.autoObj.style.left = this.obj.offsetLeft + "px";
        this.autoObj.style.top = this.obj.offsetTop + this.obj.offsetHeight + "px";
    },
    //删除自动完成需要的所有DIV
    deleteDIV: function(){
        while(this.autoObj.hasChildNodes()){
            this.autoObj.removeChild(this.autoObj.firstChild);
        }
        setClass.addClass(this.autoObj,"hidden");
    },
    autoOnmouseover: function(index){
        if(index != this.index){
            setClass.addClass(this.autoObj.children[index],"on");
            setClass.removeClass(this.autoObj.children[this.index],"on");
            this.index = index;
        }
    },
    setValue: function(This){
        return function(){
            This.obj.value = this.seq;
            setClass.addClass(This.autoObj,"hidden");
        }
    },
    // 响应键盘
    pressKey: function(event){
        var code = event.keyCode;
        var length = this.autoObj.children.length;
        if(code == 38){        //↑
            setClass.removeClass(this.autoObj.children[this.index],"on");
            this.index--;
            if(this.index < 0){
                this.index = length - 1;
            }
            setClass.addClass(this.autoObj.children[this.index],"on");
            this.obj.value = this.autoObj.children[this.index].seq;
        }else if(code == 40){    //↓
            setClass.removeClass(this.autoObj.children[this.index],"on");
            this.index++;
            if(this.index > length-1){
                this.index = 0;
            }
            setClass.addClass(this.autoObj.children[this.index],"on");
            this.obj.value = this.autoObj.children[this.index].seq;
        }else{            //回车
            this.obj.value = this.autoObj.children[this.index].seq;
            setClass.addClass(this.autoObj,"hidden");
            this.index = -1;
        }
    },
    // 程序入口
    start: function(event){
        event = event || window.event;
        var code = event.keyCode;
        var This = this;
        if(code != 13 && code != 38 && code != 40){
            this.init();
            this.deleteDIV();
            this.search_value = this.obj.value;
            var valueArr = this.value_arr.unique();
            //去掉前后空格不能为空
            if(this.obj.value.replace(/(^s*)|(s*$)/g,"") == ""){ return;}
            //判断数组中是否含有输入的关键字
            try{
                var reg = new RegExp("("+ this.obj.value +")","i");    //输入"aaa" 则 reg = /(aaa)/i
            }catch(e){
                alert(e.message); 
            }
            var div_index = 0;    //记录匹配索引个数
            for (var i = 0; i < valueArr.length; i++) {
                if(reg.test(valueArr[i])){
                    var div = document.createElement("div");
                    div.className = "auto_out";
                    div.seq = valueArr[i];
                    div.index = div_index;
                    div.innerHTML = valueArr[i].replace(reg,"<strong>$1</strong>");
                    this.autoObj.appendChild(div);
                    setClass.removeClass(this.autoObj,"hidden");
                    div_index++;
                    if(div_index == 1) {
                        setClass.addClass(this.autoObj.firstChild,"on");
                        this.index = 0;
                    }
                    div.onmouseover = function(){
                        This.autoOnmouseover(this.index);
                    }
                    div.onclick = this.setValue(This);
                }
            }
        }else{
            this.pressKey(event);
        }
        window.onresize = Bind(This);
    }
}
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原文地址：https://www.cnblogs.com/1gaoyu/p/11875588.html