Vue.Draggable add

by kabanoki

HTML

<ul id="app">
 <button v-on:click="doAdd">追加</button>
 <draggable>
   <li v-for="item, index in myList" :key="item.no">{{item.name}}-(No.{{item.no}})</li>
 </draggable>
</ul>

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/Sortable.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Vue.Draggable/2.23.2/vuedraggable.umd.min.js"></script>

CSS

#app {
  padding : 15px;
}

li {
  cursor:pointer;
  padding: 10px;
  border: solid #ddd 1px;
}

Vue

new Vue({
  el: "#app",
  data: {
    items:[
      {no:1, name:'キャベツ', categoryNo:'1'},
      {no:2, name:'ステーキ', categoryNo:'2'},
      {no:3, name:'リンゴ', categoryNo:'3'}
    ],
    newNo: 4
  },
  computed: {
    myList: function(){
      return this.items;
    }
  },
  methods: {
    doAdd:function(){
      var self = this;
      var no = 0;
          　
      if(self.items.concat().length > 0){
        no =  Math.max.apply(null,self.items.concat().map(function(item){return item.no;})) +1;
        self.newNo = self.newNo < no ? no:self.newNo;
      }

      this.items.push(
        {
          no:　this.newNo,
          name:'追加リスト'+ this.newNo,
          categoryNo:'5'
        }
      );
    },
  }
});