移动端下拉加载更多(h5,小程序)

1.h5,使用原生方式监听页面滚动下拉加载更多

<template>
  <div></div>
</template>

<script>
export default {
  data() {
    return {
      loadflag: true,
      maxpages: 0, //最大页码
      currentpage: 0, //当前页
      listData: [],
      config: {
        page: 1,
        pageSize: 15,
        total: 0,
        pages: 0,
      },
    }
  },
  created() {
    this.getList()
    window.addEventListener('scroll', this.handleScroll, true)
  },
  methods: {
    handleScroll() {
      const _this = this
      let scrollTop =
        document.documentElement.scrollTop || document.body.scrollTop
      //变量windowHeight是可视区的高度
      let windowHeight =
        document.documentElement.clientHeight || document.body.clientHeight
      //变量scrollHeight是滚动条的总高度
      let scrollHeight =
        document.documentElement.scrollHeight || document.body.scrollHeight
      //滚动条到底部的条件
      let data = scrollTop + windowHeight
      if (
        data == scrollHeight ||
        (scrollHeight - data <= 60 && _this.loadflag)
      ) {
        let currentpage = _this.currentpage
        let maxpages = _this.maxpages
        if (maxpages > currentpage && _this.loadflag) {
          _this.loadflag = false
          _this.config.page++
          _this.getList()
        }
      }
    },
    async getList() {
      let params = {
        page: this.config.page,
        pageSize: this.config.pageSize,
      }
      const res = await apiGet(posterGetBrochureList, params)
      this.isShowList = true

      if (res.code == 200) {
        const { total, records, current, pages } = res.data
        this.config.page = current //当前页
        this.config.pages = pages //总共多少页
        this.config.total = total //总条数
        this.maxpages = pages
        this.currentpage = current
        if (current <= pages) {
          this.loadflag = true
          this.listData = [...this.listData, ...records]
        } else {
          this.listData = records
        }
      }
    },
  },
  destroyed() {
    //离开页面的时候移除监听滚动事件,提高性能
    window.removeEventListener('scroll', this.handleScroll, true)
  },
}
</script>

<style lang="scss" scoped></style>

2.使用组件vant(van-list)

<template>
  <div></div>
</template>

<script>
export default {
  data() {
    return {
      listLoading: false, //分页加载
      finished: false, //分页是否加载完成
      listData: [],
      config: {
        page: 1,
        pageSize: 10,
        total: 0,
      },
    }
  },
  created() {
    this.getList()
  },
  methods: {
    //关键函数,监听下拉加载更多
    onLoad() {
      this.getList()
    },
    async getList() {
      const formData = {
        page: this.config.page,
        pageSize: this.config.pageSize,
      }
      const res = await apiGet(apigetqueryArchiveMatchedPageList, formData)
      if (res.code == 200) {
        const data = res.data
        this.listData = [...this.listData, ...data.records]
        this.listLoading = false
        //判断如果当前请求条数小于十条,就停止下拉加载
        if (data.records.length < 10) {
          this.finished = true
        }
        this.config.page++
      }
    },
  },
}
</script>

<style lang="scss" scoped></style>

3.uniapp使用scroll-view下拉加载更多

 <scroll-view
        class="law_main"
        scroll-y="true"
        @scrolltolower="lower"
        lower-threshold="50"
        refresher-enabled
        :refresher-triggered="triggered"
        @refresherrefresh="onRefresh"
      >
 <view v-for="(item, index) in dataList" :key="index" class="content">
  <view class="time">
    {{ item.createTime }}
  </view>
  <view class="score">
   {{ item.integral }}
    </view>
   </view>
   <!-- <view class="more_text" v-if="showMoreData">没有数据了...</view> -->
   </scroll-view>

<script>
import { exam } from '@/api/index.js'
export default {
  data() {
    return {
      dataList: [],
      pageNum: 1,
      pageSize: 20,
      totalPage: 1,
      triggered: false,
      isfreshing: false,
      showMoreData: false,
      title: '暂无数据',
    }
  },
  onShow() {
    this.getData()
  },
  methods: {
    lower(e) {
      if (this.pageNum < this.totalPage) {
        this.pageNum += 1
        this.getData()
      }
    },
    onRefresh() {
      if (!this.triggered) {
        if (this.isfreshing) return
        this.isfreshing = true
        if (!this.triggered) {
          this.triggered = true
        }
        this.showMoreData = false
        this.emptyData = false
        this.dataList = []
        this.pageNum = 1
        this.getData()
      }
    },
    getData() {
      let params = {
        current: this.pageNum,
        size: this.pageSize,
      }
      uni.showLoading({
        title: '正在加载',
      })
      try {
        exam.answerPaperUserPaperList(params).then((res) => {
          if (this.pageNum == 1) {
            this.dataList = res.data.records
            this.triggered = false
            this.isfreshing = false
          } else {
            this.dataList = this.dataList.concat(res.data.records)
          }
          // if (this.dataList.length == res.data.total && this.dataList.length > 20) {
          // 	this.showMoreData = true;
          // }
          res.data.total == this.pageSize
            ? (this.totalPage = 1)
            : (this.totalPage = parseInt(res.data.total / this.pageSize + 1))
          if (!this.dataList.length) {
            this.emptyData = true
            this.showMoreData = false
          }
          uni.hideLoading()
        })
      } catch (error) {
        uni.hideLoading()
      }
    },
  },
  onUnload() {},
}
</script>

tips:使用scroll-view下拉加载更多时,需要给一个高度,否则下拉加载将不生效

4.uniapp监听页面触底加载更多onReachBottom

<script>
import { articlePageListApi } from '@/service/newpage.js'
import qs from 'qs'
export default {
  data() {
    return {
      params: {
        page: 1,
        pageSize: 10,
      },
      status: 'loadmore',// loadmore/loading / nomore
      artlist: [],
      hasmore: true,
    }
  },
  onLoad() {
    this.params.page = 1
    this.artlist = []
    this.hasmore = true
    this.getMylist()
  },
  //关键代码下拉刷新加载更多
  onReachBottom() {
    this.status = 'loading'
    if (this.hasmore) {
      this.status = 'loading'
      this.params.page++
      this.getMylist()
    } else {
      let timmer = setTimeout(() => {
        this.status = 'nomore'
      }, 1000)
    }
  },
  methods: {
    getMylist() {
      articlePageListApi(
        qs.stringify({
          ...this.params,
        }),
      ).then((res) => {
        if (res.data) {
          const { list } = res.data
          if (this.artlist?.length < list.total) {
            this.hasmore = true
            this.status = 'loadmore'
          } else {
            this.hasmore = false
            this.status = 'nomore'
          }
          this.artlist = [...this.artlist, ...list.records]
        }
      })
    },
  },
}
</script>