uniapp项目实践总结(十七)实现滚动触底加载

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);
}