How to implement pull-up loading in uniapp

With the widespread popularity of smartphones, the development and demand for mobile applications continue to increase. In mobile applications, pull-up loading has become an important function.

In uniapp, the implementation of pull-up and load more operations is relatively simple and only requires some basic configuration. This article will introduce more implementation methods of pull-up loading in uniapp.

1. Preparation

Before implementing pull-up to load more, you need to prepare some necessary environments and components. These components include:

1. scroll-view component: A component used to scroll the page.
2. v-for instruction: used to loop the data list.
3. onLoadMore function: Business logic used to implement pull-up loading for more functions.
4. pageIndex variable: used to record the page number of the currently loaded data.

2. Implementation method

1. Add scroll event in scroll-view component and bind onLoadMore function

<scroll-view class="list" scroll-y="true" @scrolltolower="onLoadMore">
  <view v-for="(item, index) in dataList" :key="index">{{item}}</view>
</scroll-view>

In scroll-view Add a scrolltolower event to the component, which can be triggered when scrolling to the bottom of the scroll area. When the event is triggered, the onLoadMore function will be called to implement the pull-up loading function.

2. Implement the onLoadMore function

onLoadMore() {
  pageIndex++
  //模拟数据请求
  setTimeout(() => {
    for(let i = 1; i <= 10; i++) {
      this.dataList.push('第' + (pageIndex * 10 + i) + '条数据')
    }
  }, 500)
}

The onLoadMore function mainly includes two parts: the auto-increment of the page number pageIndex and the data request. Whenever the user scrolls down the page, the function increments the pageIndex variable by 1 and then uses this variable to request the next page of data from the server. Here we use the setTimeout function to simulate data requests.

3. Bind data

When binding data, you need to declare the data list (dataList) and the current page number (pageIndex) variables. These two variables need to be initialized when loading for the first time, and then updated by the onLoadMore function.

export default {
  data() {
    return {
      dataList: [],
      pageIndex: 0
    }
  },
  onLoad() {
    this.onLoadMore()
  },
  methods: {
    onLoadMore() {
      //...
    }
  }
}

3. Summary

Pull-up loading is more of a common function in mobile applications, and uniapp provides a simple and easy-to-use implementation method. Through the cooperation of the scroll-view component and the onLoadMore function, we can embed more pull-up loading operations in the application to provide users with a better browsing experience.

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