vue part3.4 小案例 消息订阅pubsub与ajax

 pubsub消息订阅组件，便于兄弟组件间调用

npm install --save pubsub-js

 

app.vue

<template>
  <div class="container">
    <Search></Search>
    <users-main></users-main>
  </div>
</template>

<script>
import Search from './components/Search'
import Main from './components/Main'
export default {
  components: {
    Search,
    UsersMain: Main
  }
}

</script>

<style>
  .card {
    float:left;
     33.333%;
    padding: .75rem;
    margin-bottom: 2rem;
    border: 1px solid #efefef;
    text-align: center;
  }
  .card > img {
    margin-bottom: .75rem;
    border-radius: 100px;
  }
  .card-text {
    font-size: 85%;
  }
</style>

main.vue

// 由于请求状态在Main中，ajax写在main中以便同步更新4个状态。 写在search中不便更新状态。

<template>
  <div>
    <h2 v-if="firstView">输入用户名搜索</h2>
    <h2 v-if="loading">LOADING...</h2>
    <h2 v-if="errorMsg">{{errorMsg}}</h2>
    <div class="row">
      <div class="card" v-for="(user, index) in users" :key="index">
        <a :href="user.url" target="_blank">
          <img :src="user.avatar_url" style=" 100px;">
        </a>
        <p class="card-text">{{user.name}}</p>
      </div>
    </div>
  </div>
</template>

<script>
import PubSub from 'pubsub-js'
import axios from 'axios'
export default {
  data () {
    return {
      firstView: true,
      loading: false,
      users: null, // [{url: '', avatar_url: '', name: ''}]
      errorMsg: ''
    }
  },
  // 由于请求状态在Main中，ajax写在main中以便同步更新4个状态。 写在search中不便更新状态。

  mounted () {
    PubSub.subscribe('search', (msg, searchName) => {
      const url = `https://api.github.com/search/users?q=${searchName}`
      this.users = null
      this.errorMsg = ''
      this.firstView = false
      this.loading = true
      axios.get(url).then(response => {
        const result = response.data
        const users = result.items.map(item => ({
          url: item.html_url,
          avatar_url: item.avatar_url,
          name: item.login
        }))
        this.loading = false
        this.users = users
      }).catch(error => {
        this.loading = false
        this.errorMsg = '请求失败'
      })
    })
  }
}
</script>

<style>

</style>

search.vue

<template>
  <section class="jumbotron">
    <h3 class="jumbotron--heading">Search Github Users</h3>
    <div>
      <input type="text" placeholder="enter the name you search" v-model="searchName"/>
      <button @click="search">Search</button>
    </div>
  </section>
</template>

<script>
import PubSub from 'pubsub-js'
export default {
  data () {
    return {
      searchName: ''
    }
  },
  methods: {
    search () {
      const searchName = this.searchName.trim()
      if (searchName) {
        PubSub.publish('search', searchName)
      }
    }
  }
}

</script>

<style>

</style>