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{

    width: 240px;

    margin: 20px auto 0 auto;

}

.auto-inp{

    width: 240px;

    height: 36px;

    padding-left: .5em;

    border-radius: 2px;

    border: 1px solid #dedede;

    color: #666;

    outline: none;

}

.auto{

    width: 240px;

    border: 1px solid #dedede;

    border-top: none;

    position: absolute;

}

.auto_out{

    width: 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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input输入框联想功能

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