How to implement click-to-load more functions in uniapp

With the development of the mobile phone industry, mobile applications are becoming more and more popular, and multi-terminal development has become a common method. Based on this, uniapp turned out to be a development framework that can develop iOS, Android, H5 and other platforms at the same time. In uniapp, how to achieve click-to-load more?

1. Use the uni-list component

Uni-list is a list component encapsulated by uniapp, which implements the rendering and scrolling of the list. In uni-list, an additional attribute loadmore is set, which can automatically load the next page after sliding to the bottom.

First, define the uni-list component in the template and set the loadmore attribute to true. The code is as follows:

<template>
  <uni-list :loadmore="true" :loadtext="loadtext" @loadmore="getMoreData">
    <uni-list-item v-for="(item, index) in listData" :key="index">
      {{item}}
    </uni-list-item>
  </uni-list>
</template>

Among them, loadtext is the text displayed when loading, and getMoreData is a custom method, used to obtain the next page of data.

Next, define the data data and getMoreData method in the script. The code is as follows:

<script>
  export default {
    data() {
      return {
        // 列表数据
        listData: [],
        // 加载时的文本提示
        loadtext: '正在加载...',
        // 当前页码
        currentPage: 1,
        // 每页展示数量
        pageSize: 10
      }
    },
    methods: {
      getMoreData() {
        // 发送请求获取下一页数据
        uni.request({
          url: 'https://example.com/getMoreData',
          data: {
            page: this.currentPage + 1,
            pageSize: this.pageSize
          },
          success: res => {
            // 将数据添加到列表中
            this.listData = this.listData.concat(res.data.list)
            // 将页码+1
            this.currentPage++
            // 如果没有更多数据了，显示已经到底部
            if (!res.data.hasMoreData) {
              this.loadtext = '没有更多了'
            }
          },
          fail: err => {
            console.log(err)
          }
        })
      }
    }
  }
</script>

The getMoreData method implements the function of sending a request to obtain the next page data, and after obtaining the data, Add it to the list. At the same time, when there is no more data to load, the loadtext is set to "no more".

2. Custom button triggers loading more

In addition to using the loadmore attribute of uni-list, we can also use custom buttons to trigger loading more functions. The specific implementation method is as follows.

First, add a custom button in the template to trigger loading more. The code is as follows:

<template>
  <div>
    <uni-list :loadmore="false">
      <uni-list-item v-for="(item, index) in listData" :key="index">
        {{item}}
      </uni-list-item>
    </uni-list>
    <button @click="getMoreData">点击加载更多</button>
  </div>
</template>

Among them, the loadmore attribute of uni-list is set to false, which means it is not automatic. Loading more needs to be triggered manually by clicking a button.

Then, define the data data and getMoreData method in the script. The code is as follows:

<script>
  export default {
    data() {
      return {
        // 列表数据
        listData: [],
        // 当前页码
        currentPage: 1,
        // 每页展示数量
        pageSize: 10,
        // 是否有更多数据
        hasMoreData: true
      }
    },
    methods: {
      getMoreData() {
        // 发送请求获取下一页数据
        uni.request({
          url: 'https://example.com/getMoreData',
          data: {
            page: this.currentPage + 1,
            pageSize: this.pageSize
          },
          success: res => {
            // 将数据添加到列表中
            this.listData = this.listData.concat(res.data.list)
            // 将页码+1
            this.currentPage++
            // 如果没有更多数据了，隐藏按钮
            if (!res.data.hasMoreData) {
              this.hasMoreData = false
            }
          },
          fail: err => {
            console.log(err)
          }
        })
      }
    }
  }
</script>

In the getMoreData method, we also send a request to obtain the next page data, and after obtaining the data, Add to list. When there is no more data, set hasMoreData to false so that the button no longer displays.

Finally, we need to set a v-if judgment on the button to determine whether there is more data. The code is as follows:

<button v-if="hasMoreData" @click="getMoreData">点击加载更多</button>

In this way, we can click the button to Loading more data manually.

Summary

This article introduces two ways to achieve click-to-load more in uniapp: using the uni-list component and custom button triggering. Either way, it's basically a method of sending a request to get more data and add it to a list. For developers, which implementation method they choose can be chosen based on specific scenarios.

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