How to use Vue to implement pull-down refresh and pull-up loading?

With the popularity of mobile Internet, pull-down to refresh and pull-up to load have become one of the standard features of modern apps and websites. These two interaction methods can greatly improve user experience and page performance. Under the Vue framework, we can use some plug-ins or write code ourselves to achieve these two interaction methods.

Implementation of pull-down refresh

Pull-down refresh refers to the operation in which the user triggers data refresh by pulling down the page. In Vue, we can implement pull-down refresh through all Vue options and APIs, and the fastest and most reliable way is to use vue-pull-to.

vue-pull-to is a component that implements pull-down refresh operations in Vue, allowing us to add pull-down refresh to the application very simply. Developed by Vue.js Summit instructor Matt Maribojoc, this component makes using vue-pull-to just as easy and clean as using a normal Vue component.

First, install vue-pull-to in the project:

npm install vue-pull-to --save

Then, introduce vue-pull-to into the component that needs pull-down refresh, and register it as one of the current Vue components.

<template>
  <div>
    <pull-to @refresh="refresh" :disabled="disabled" :high-action="true">
      <div v-for="(item, index) in list" :key="index" class="item">{{ item }}</div>
    </pull-to>
  </div>
</template>

<script>
  import PullTo from 'vue-pull-to'

  export default {
    components: {
      PullTo
    },
    data() {
      return {
        list: [], // 下拉刷新的数据
        disabled: false, // 是否禁用下拉刷新
      }
    },
    methods: {
      // 下拉刷新回调事件
      refresh() {
        // 发送请求，获取最新数据
        axios.get('/getList').then(res => {
          this.list = res.data
        })
      }
    }
  }
</script>

In the above code, we first introduce vue-pull-to and register it as a component. Next, use the pull-to tag in the template and listen to its refresh event (this event is triggered when the user pulls down the page), and then sends a request to the server in the refresh callback function to obtain the latest data and assign the data to the list, so that when After the pull-down refresh is completed, the list data will be updated and the page will be re-rendered.

Implementation of pull-up loading

Pull-up loading usually occurs when the page scrolls down. When the user scrolls to the bottom, the page will automatically trigger the data loading operation. In Vue, we can use the vue-infinite-loading plug-in to implement the pull-up loading function.

vue-infinite-loading is a Vue-based loading plug-in for long lists that allows us to dynamically add content or data when scrolling the list. It provides two ways to listen to scroll events, the first is imperative use, and the second is component-based use, and supports state management during loading and when there is no more data.

First, install vue-infinite-loading in the project:

npm install vue-infinite-loading --save

Then introduce the vue-infinite-loading component into the component that needs to be added with pull-up loading, and register it as the current Vue a component of.

<template>
  <div>
    <div v-for="(item, index) in list" :key="index" class="item">
      {{ item }}
    </div>
    <infinite-loading :on-infinite="onInfinite" spinner="bubbles" :distance="120">
      <div slot="no-results">没有更多了</div>
    </infinite-loading>
  </div>
</template>

<script>
  import InfiniteLoading from 'vue-infinite-loading'

  export default {
    components: {
      InfiniteLoading
    },
    data() {
      return {
        list: [], // 上拉加载的数据
        page: 1, // 当前页码
        size: 10, // 每页数量
        isLoading: false, // 是否正在加载中
      }
    },
    methods: {
      // 上拉加载回调事件
      onInfinite() {
        if (this.isLoading) return
        this.isLoading = true
        axios.get('/getList', {page: this.page, size: this.size}).then(res => {
          this.list = this.list.concat(res.data)
          this.page++
          this.isLoading = false
          this.$refs.infiniteLoading.$emit('$InfiniteLoading:loaded')
        })
      }
    }
  }
</script>

In the above code, we first introduce vue-infinite-loading and register it as a component. Then, use the infinite-loading tag in the template and listen to its on-infinite event (this event will be triggered when the user scrolls to the bottom) and then send a request to the server in the onInfinite callback function to obtain the next page data and append it to In the list array, trigger the $InfiniteLoading:loaded event, so that when the page is loaded, the loading status will be cleared, and the page will be updated and rendered. We can also use the distance attribute to control the distance that triggers loading, the spinner attribute to set the loading animation, and the no-results slot to set the prompt information after loading is completed, etc.

Summary

In the mobile Internet era, pull-down refresh and pull-up loading have become standard features of modern apps and websites. In order to improve the user experience, Vue provides some plug-ins and APIs to implement these two Interaction mode allows developers to quickly add corresponding functions and make the user experience more comfortable. We have given a brief introduction and code demonstration of the pull-down refresh and pull-up loading methods in Vue. We hope it will be helpful to everyone in actual development.

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