Vue v-for循环-过滤数组时如何定位组件

时间:2018-11-27 21:54:51

标签: javascript arrays vue.js vuejs2 v-for

我正在使用计算值来动态过滤数组(“订单”)。

计算的.filter()函数允许用户按订单号,名称或参考号动态搜索:

data() {
  return {
    orders: [],
    search: ""  // search string from a text input    
  };
},

computed: {
  filtered: 
    return this.orders.filter(order => {
      const s =
        order.order_number + order.reference + order.name;
      const su = s.toUpperCase();
      return su.match(this.search.toUpperCase());
    });
  }

我正在使用v-for循环来呈现搜索结果,如下所示:

 <tbody v-for="(order, index) in filtered" :key="order.id">              
   <tr>       
     <td @click="add_events(order, index)>{{order.order_number}}</td>
     <td>{{order.reference}}</td>
     <td>{{order.name}}</td>
      ...
    </tr>
  </tbody>

我想使用@click来定位已过滤数组中的特定组件(对象),并使用$set将该值(“ objEvents”)附加到该对象:

methods: {
  add_events (order, index) {
    const objEvents= [ external data from an API ]      
    this.$set(this.orders[index], "events", objEvents)          
  }
}

但是过滤的数组(“过滤的”)中组件的index原始中的组件index不同数组(“订单”),因此add_events方法定位的组件错误。

我可以使用key定位正确的组件吗?还是有其他方法可以在过滤后的数组中标识目标组件?

2 个答案:

答案 0 :(得分:2)

无需跟踪indexfiltered只是orders中对原始对象的引用的数组,因此您可以修改order中的add_events()迭代器以实现所需的效果:

this.$set(order, 'events', objEvents);

new Vue({
  el: '#app',
  data() {
    return {
      orders: [
        {id: 1, order_number: 111, name: 'John', reference: 'R111'},
        {id: 2, order_number: 222, name: 'Bob', reference: 'R222'},
        {id: 3, order_number: 333, name: 'Bob', reference: 'R333'},
      ],
      search: ''
    };
  },
  computed: {
    filtered() {
      return this.orders.filter(order => {
        const s =
              order.order_number + order.reference + order.name;
        const su = s.toUpperCase();
        return su.match(this.search.toUpperCase());
      });
    }
  },
  methods: {
    add_events(order, index) {
      const objEvents = [
        {id: 1, name: 'Event 1'},
        {id: 2, name: 'Event 2'},
        {id: 3, name: 'Event 3'}
      ];
      this.$set(order, "events", objEvents);
    }
  }
})
<script src="https://unpkg.com/vue@2.5.17"></script>

<div id="app">
  <input type="text" v-model="search" placeholder="Search">
  <table>
    <tbody v-for="(order, index) in filtered" :key="order.id">              
      <tr>
        <td @click="add_events(order, index)">{{order.order_number}}</td>
        <td>{{order.reference}}</td>
        <td>{{order.name}}</td>
        <td>{{order.events}}</td>
      </tr>
    </tbody>
  </table>
  
  <pre>{{orders}}</pre>
</div>

答案 1 :(得分:1)

您可以映射原始数组,并将origIndex属性添加到每个项目,如下所示:

    computed:{
        filtered(){
           let mapped= this.orders.map((item,i)=>{
                             let tmp=item;
                              tmp.origIndex=i;
                             return tmp;
                            });
             return this.mapped.filter(order => {
                    const s =
                      order.order_number + order.reference + order.name;
                       const su = s.toUpperCase();
                    return su.match(this.search.toUpperCase());
             });
            }
        }//end computed

在模板中,使用origIndex属性而不是index

           <tbody v-for="(order, index) in filtered" :key="order.id">              
              <tr>       
                <td @click="add_events(order, order.origIndex)>{{order.order_number}}</td>
               <td>{{order.reference}}</td>
                <td>{{order.name}}</td>
                 ...
               </tr>
            </tbody>