Vue.js v-show in a list

问题

I'm sure this one's gonna be extremely easy for you guys. I am trying to make a simple list of posts with the post titles always visible, and when you click a specific post in the list, you get the post's body. I used v-show for that. However, when I click a specific post, the bodies of all of the posts appear, instead of just the one that I clicked.

Here's the template:

<template>
<div class="container">
    <h1>My Posts</h1>
    <ul class="list-group">
        <li class="list-group-item" v-for="post in list">
            <div @click="changeShow">
                <h4>{{ post.title }}</h4>
                <p v-show="show">{{ post.body }}</p>
                <span v-show="show" class="label label-primary">ID: {{ post.userId }}</span>
            </div>
        </li>
    </ul>

</div>

And the logic:

<script>

export default{

    data(){
        return{
            msg:'hello vue',
            list: [],
            show: false
        }
    },
    ready(){
        this.fetchPostList();
    },

    methods:{
        fetchPostList: function () {
            var root = 'http://jsonplaceholder.typicode.com';
            this.$http.get(root + '/posts').then(function (response) {
                this.list = response.data;
            })
        },
        changeShow: function () {
            this.show = !this.show;
        }
    }

}

回答1:

There's a few ways to approach this depending on your needs.

Multiple Open

You can make each post it's own component, that way you can have show be tied to each individual post instead of all of them.

Vue.component('post', {
  template: '#post-template',
  props: {
    post: Object,
  },
  data() {
    return {
      show: false,
    }
  },
  methods: {
    toggleShow() {
      this.show = !this.show
    },
  },
})

Then you can have use it like this:

<post v-for="post in posts" :post="post"></post>

One Open

If you just want one open you can pass an id as a prop and show it based on that.

Vue.component('post', {
  template: '#post-template',
  props: {
    post: Object,
    selectedId: Number,
  },
  computed: {
    show() {
      return this.post.id === this.selectedId
    },
  },
})

Then you can do like

<post :selected-id="selectedId" :post="post" @click="selectedId = post.id"></post>

回答2:

I cheated in a different way. Just added a show property to each post and toggled that.

new Vue({
  el: 'body',
  data: {
    list: []
  },
  ready: function() {
    this.fetchPostList()
  },
  methods: {
    fetchPostList: function() {
      setTimeout(function() {
        this.list.push({
          title: 'First Post',
          body: 'This is the first Post',
          userId: 'Joe',
          show: false
        });
        this.list.push({
          title: 'Second Post',
          body: 'This is the second Post',
          userId: 'Joe',
          show: false
        });
        this.list.push({
          title: 'Third Post',
          body: 'This is the third Post',
          userId: 'Joe',
          show: false
        });
      }.bind(this), 2000);
    },
    changeShow: function(idx) {
      this.list[idx].show = !this.list[idx].show;
    }
  }
});

<link href="//cdnjs.cloudflare.com/ajax/libs/skeleton/2.0.4/skeleton.min.css" rel="stylesheet" />
<script src="//cdnjs.cloudflare.com/ajax/libs/vue/1.0.26/vue.min.js"></script>
<div class="container">
  <h1>My Posts</h1>
  <ul class="list-group">
    <li class="list-group-item" v-for="post in list">
      <div @click="changeShow($index)">
        <h4>{{ post.title }}</h4>
        <p v-show="post.show">{{ post.body }}</p>
        <span v-show="post.show" class="label label-primary">ID: {{ post.userId }}</span>
      </div>
    </li>
  </ul>
</div>

来源：https://stackoverflow.com/questions/39778665/vue-js-v-show-in-a-list