uniapp项目实践总结(十七)实现滚动触底加载

news2024/11/24 12:02:42

导语：在日测的开发过程中，经常会碰到页面需要渲染大量数据的情况，这时候就需要用到滚动加载功能，下面总结一下方法。

原理分析

使用@scrolltolower事件来监听滚动到底部，然后加载下一页的数据。

实战演练

模板页面

<scroll-view
  :scroll-y="true"
  class="block-main block-two-level block-pad"
  @scrolltolower="scrollBottom">
  <view class="scroll-ls" v-for="(item, index) in scrollInfo.list" :key="index"> {{ item }} </view>
  <uni-load-more v-if="scrollInfo.list.length" :status="scrollInfo.loading"></uni-load-more>
</scroll-view>

样式编写

.scroll-ls {
  margin-top: 20rpx;
  padding: 50rpx 0;
  text-align: center;
  background: $f8;
}

脚本使用

定义数据

// 滚动列表
const scrollInfo = reactive({
  originList: [
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
    27, 28,
  ],
  list: [],
  pageInfo: {
    page: 1,
    size: 8,
    pages: 0,
  },
  loading: "more",
});

方法调用

// 滚动到底部
function scrollBottom() {
  console.log("滚动到底部!");
  if (scrollInfo.pageInfo.page < scrollInfo.pageInfo.pages) {
    scrollInfo.pageInfo.page++;
    scrollInfo.loading = "loading";
    getList();
  } else {
    scrollInfo.loading = "noMore";
  }
}

获取列表

// 获取列表
function getList() {
  if (scrollInfo.pageInfo.page <= 1) {
    show.value = true;
  }
  let data = proxy.$apis.utils.splitData(scrollInfo.originList, 8);
  scrollInfo.pageInfo.pages = data.pages;
  setTimeout(() => {
    if (scrollInfo.pageInfo.page <= 1) {
      scrollInfo.list = data.list[scrollInfo.pageInfo.page - 1];
      setTimeout(() => {
        show.value = false;
      }, 500);
    } else {
      scrollInfo.list = [...scrollInfo.list, ...data.list[scrollInfo.pageInfo.page - 1]];
    }
    scrollInfo.loading = scrollInfo.pageInfo.page < scrollInfo.pageInfo.pages ? "more" : "noMore";
  }, 1000);
}