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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Vue SelectMultiple Left & Right</title>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
</head>
<body>
  <div id="App1" class="container">
    <div class="row align-items-center">
      <div class="col-3">
        備選：<br />
        <select multiple size="10" v-model="sltcities">
          <option v-for="item in cities">{{item.city}}</option>
        </select>
      </div>
      <div class="col-2">
        <button v-on:click="CitiesAddToFilter" class="btn btn-primary">→</button>
        <br />
        <button v-on:click="CitiesRemoveFromFilter" class="btn btn-info">←</button>
      </div>
      <div class="col-3">
        條件：<br />
        <select multiple size="10" v-model="sltCityFilter">
          <option v-for="city in MDFilter.cities">{{city}}</option>
        </select>
      </div>
      <div class="col-4"></div>
    </div>
    
  </div>
  
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
</body>
</html>
 
let App1=new Vue({
  el:'#App1',
  data:{
    sltcities: [],
    sltCityFilter:[],
    cities: [],
    MDFilter: {
      cities: [],
    },    
  },
  methods:{
    CitiesAddToFilter: function () {
      if (!this.MDFilter.cities) {
        this.MDFilter.cities = [];
      }
      this.sltcities.forEach(city => {
        //檢查是否已經存在
        if (!this.MDFilter.cities.includes(city)) {
          //不存在，加入條件、移除備選
          this.MDFilter.cities.push(city);
          let idx = 0;
          this.cities.forEach(itm => {
            if (itm.city == city) {
              this.cities.splice(idx, 1);
            }
            idx++;
          });
        }
      });
    },
    CitiesRemoveFromFilter: function () {
      this.sltCityFilter.forEach(sltcity => {
        //加入回備選
        let tmpCity = {};
        tmpCity.city = sltcity;
        this.cities.push(tmpCity);
​
        //移除條件：
        let idx = 0;
        this.MDFilter.cities.forEach(city => {
          if (city == sltcity) {
            this.MDFilter.cities.splice(idx, 1);
          }
          idx++;
        });
      });
    },
    citiesInit: function () {
      this.cities = [
        { city: '臺北市' },
        { city: '基隆市' },
        { city: '宜蘭縣' },
        { city: '新北市' },
        { city: '連江縣' },
        { city: '新竹市' },
        { city: '新竹縣' },
        { city: '桃園市' },
        { city: '苗栗縣' },
        { city: '臺中市' },
        { city: '南投縣' },
        { city: '彰化縣' },
        { city: '嘉義市' },
        { city: '嘉義縣' },
        { city: '雲林縣' },
        { city: '臺南市' },
        { city: '澎湖縣' },
        { city: '金門縣' },
        { city: '高雄市' },
        { city: '屏東縣' },
        { city: '臺東縣' },
        { city: '花蓮縣' },
      ];
    },
    
  },
  mounted:function(){
    this.citiesInit();
  },
  
  
});
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