How to use uniapp to develop rolling loading function

How to use uniapp to develop rolling loading function

Scrolling loading is a common web development function that can dynamically load more data when the user scrolls the page to achieve an infinite scrolling effect. In uniapp, we can use some technologies and methods to implement the rolling loading function.

1. Layout page

First, we need to lay out the components and containers required for the scrolling loading function in the uniapp page. It is recommended to use uniapp's official component uni-list to achieve the scrolling loading effect, because it has internally implemented scrolling listening and scrolling to the bottom events. The following is a simple page layout example:

<template>
  <view>
    <uni-list @bottom="loadMoreData" :bottomMethod="true">
      <view v-for="(item, index) in dataList" :key="index">
        // 数据展示部分
      </view>
    </uni-list>
  </view>
</template>

In this example, we use the uni-list component, which listens to the @bottom event. When the page scrolls to the bottom, it will Trigger the loadMoreData method to load more data.

2. Load more data

Next, we need to implement the loadMoreData method in the script code of the page to load more data . The following is a simple example of loading data:

<script>
export default {
  data() {
    return {
      dataList: [], //展示数据的列表
      pageNo: 1, //当前页码
      pageSize: 10, //每页展示的数据数量
    }
  },
  methods: {
    loadMoreData() {
      // 发起请求，获取更多的数据
      const res = await uni.request({
        url: 'your/api/url', // 请求地址
        data: {
          pageNo: this.pageNo, // 当前页码
          pageSize: this.pageSize // 每页展示的数据数量
        }
      })
      
      // 处理获取到的数据
      if (res.data && res.data.length > 0) {
        this.dataList = this.dataList.concat(res.data) // 将获取到的数据追加到展示列表中
        this.pageNo += 1 // 下一页页码
      }
    }
  }
}
</script>

In this example, we use the uni.request method to initiate a request to obtain more data. When the data request is successful, we will append the obtained data to the end of the dataList list through the concat method, and update the value of pageNo in order to request the next page of data.

3. Show loading animation

In order to improve the user experience, we can display a loading animation when loading data. This can be achieved using the loading component uni-loading that comes with uniapp. The following is a simple example:

<template>
  // 页面布局省略...

  <uni-loading v-if="isLoading" :text="'加载中...'"></uni-loading>
</template>

In this example, we use the isLoading status to determine whether to display the loading animation. When requesting data, set isLoading For true, the loading animation will be displayed. When the data is loaded, set isLoading to false and the loading animation will be hidden.

Summary:

Through the above examples, we can find that it is not complicated to implement the rolling loading function in uniapp. The key is to use the uni-list component to listen for scrolling events, and combined with the method of requesting data and the display of loading animation, the effect of scrolling loading can be achieved. I hope this article can help you understand the rolling loading function of uniapp.

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