<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>下拉框</title>

    <link href="../public/stylesheets/bootstrap.min.css" rel="stylesheet" type="text/css">

    <script src="../public/javascripts/jquery.js" type="text/javascript"></script>

    <script src="../public/javascripts/bootstrap.min.js" type="text/javascript"></script>

    <script src="../public/javascripts/vue.js" type="text/javascript"></script>

</head>

<div class="row"  id="selectOptions">

    <div class="col-md-3">

       <h4> {{preTitle}}</h4>

    </div>

<div class="col-md-3">

<div class="dropdown">

    <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">

         {{title}}

        <span class="caret"></span>

    </button>

    <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">

        <li v-for="item in countrys"><a href="#" v-on:click="warn">{{item.country}}</a></li>

    </ul>

</div>

</div>

<div class="col-md-3">

    <div class="dropdown">

        <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">

            {{title2}}

            <span class="caret"></span>

        </button>

        <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">

            <li v-for="item in items2"><a href="#" v-on:click="warn2">{{item.province}}</a></li>

        </ul>

    </div>

</div>

<div class="col-md-3">

    <div class="dropdown">

        <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">

            {{title3}}

            <span class="caret"></span>

        </button>

        <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">

            <li v-for="item in items3"><a href="#" v-on:click="warn3">{{item.city}}</a></li>

        </ul>

    </div>

</div>

</div>

</body>

</html>

<script>

    var vm=new Vue({

        el:"#selectOptions",

        data:{

            preTitle:"联动下拉框",

            title:"国家",

            title2:"省份",

            title3:"市区",

            countrys:[

                {country:"中国"},

                {country:"美国"},

                {country:"日本"}

            ],

            items2:[],

            items3:[]

        },

        methods:{

            warn:toSelect2,

            warn2:toSelect3,

            warn3:recordSelect3,

        }

    });

   function toSelect2(event){

       vm.items2=[];

       var content=event.target.text;

       vm.title=content;

       var provinces=[{province:"江苏省"},{province:"浙江省"},{province:"上海市"}];

       for(var item in provinces){

           vm.items2.push(provinces[item]);

       }

   }

    function toSelect3(event){

        vm.items3=[];

        var content=event.target.text;

        vm.title2=content;

        var citys=[{city:"南京市"},{city:"无锡市"},{city:"苏州市"}];

        for(var item in citys){

            vm.items3.push( citys[item]);

        }

    }

    function recordSelect3(event){

        var content=event.target.text;

        vm.title3=content;

    }

</script>