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Vue v-for object does not update after data changed

Asked By: Anonymous

I use vue version 2.5.x

Example like below.

No matter how hard I click “add item” the button, no item show in page.

But the “add item version 2” works!

Add :key won’t help. What is the problem?

_x000D_

_x000D_

let app = new Vue({_x000D_
  el: "#app",_x000D_
  data: {_x000D_
    items: {},_x000D_
    count: 0,_x000D_
  },_x000D_
  methods: {_x000D_
    add() {_x000D_
      this.items[this.count.toString()] = this.count;_x000D_
      this.count++;_x000D_
      console.log(this.items);_x000D_
    },_x000D_
    add2() {_x000D_
      let items = {}_x000D_
      items[this.count.toString()] = this.count;_x000D_
      this.items = items;_x000D_
      this.count++;_x000D_
      console.log(this.items);_x000D_
    }_x000D_
  }_x000D_
})

_x000D_

<a href="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.min.js">https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.min.js</a>_x000D_
<div id="app">_x000D_
  <button @click="add">add item</button>_x000D_
  <button @click="add2">add item version 2</button>_x000D_
  <p v-for="(item, key) in items" :keys="item">{{item}}</p>_x000D_
</div>

_x000D_

_x000D_

x000D


Solution

Answered By: Anonymous

Replace : this.items[this.count.toString()] = this.count;

with Vue.set(this.items,this.count.toString(),this.count);

let app = new Vue({
  el: "#app",
  data: {
    items: {},
    count: 0,
  },
  methods: {
    add() {
        Vue.set(this.items,this.count.toString(),this.count);

      this.count++;
      console.log(this.items);
    },
    add2() {
      let items = {}
      items[this.count.toString()] = this.count;
      this.items = items;
      this.count++;
      console.log(this.items);
    }
  }
})

https://jsfiddle.net/zbb57ozv/

It’s a limitations of javascript or Vue js caveat . check out section Change Detection Caveats of vue document for more information : Vue-Js Reactivity In Depth

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