小程序滑动屏幕加载数据

作者: 陈楠酒肆 | 来源:发表于2017-08-23 15:42 被阅读158次

    滑动屏幕加载数据是任何小程序中都会用到的功能,本文我就将这个功能整理给大家,希望对大家有意。我们先看看效果图:

    功能效果图

    创建目录

    首先我们现在项目中创建资讯目录,以下是我自己创建的目录,大家可以根据自己的需求创建。如图所示:

    项目目录

    创建lists.js文件

    以下是lists.js代码

    var app = getApp()
    Page({
      data: {
        newsList: [],
        lastid: 0,
        toastHidden: true,
        confirmHidden: true,
        isfrist: 1,
        loadHidden: true,
        moreHidden: 'none',
        msg: '没有更多文章了'
      },
      loadData: function (lastid) {
        //显示出加载中的提示
        this.setData({ loadHidden: false })
    
        var limit = 10
        var that = this
    
        wx.request({
          url: 'http://127.0.0.1:9090/hpm_bill_web/news/getnewslist', //数据接口
          data: { lastid: lastid, limit: limit },
          header: {
            'Content-Type': 'application/json'
          },
          success: function (res) {
            if (!res.data) {
              that.setData({ toastHidden: false })
              that.setData({ moreHidden: 'none' })
              return false
            }
            var len = res.data.length
            var oldLastid = lastid
            if(len != 0) {
              that.setData({ lastid: res.data[len - 1].id })
            } else {
              that.setData({ toastHidden: false})
            }
            var dataArr = that.data.newsList
            var newData = dataArr.concat(res.data);
    
             if (oldLastid == 0) {
               wx.setStorageSync('CmsList', newData)
             }
             
           
            that.setData({ newsList: newData })
            that.setData({ moreHidden: '' })
          },
          fail: function (res) {
            if (lastid == 0) {
              var newData = wx.getStorageSync('CmsList')
             if(newData) {
               that.setData({ newsList: newData })
               that.setData({ moreHidden: '' })
               var len = newData.length
               if (len != 0) {
                 that.setData({ lastid: newData[len - 1].id })
               } else {
                 that.setData({ toastHidden: false })
               }
               console.log('data from cache');
             }
             
             } else {
               that.setData({ toastHidden: false, moreHidden: 'none', msg: '当前网格异常,请稍后再试' })
             }
          },
          complete: function () {
            //显示出加载中的提示
            that.setData({ loadHidden: true })
          }
        })
      },
      loadMore: function (event) {
        var id = event.currentTarget.dataset.lastid
        var isfrist = event.currentTarget.dataset.isfrist
        var that = this
    
        wx.getNetworkType({
          success: function (res) {
            var networkType = res.networkType // 返回网络类型2g,3g,4g,wifi
    
            if (networkType != 'wifi' && isfrist == '1') {
              that.setData({ confirmHidden: false })
            }
          }
        })
    
        this.setData({ isfrist: 0 })
        this.loadData(id);
      },
      onLoad: function () {
        var that = this
        this.loadData(0);
        
      },
    
      toastChange: function () {
        this.setData({ toastHidden: true })
      },
      modalChange: function () {
        this.setData({ confirmHidden: true })
      }
    })
    

    创建页面文件(lists.wxml)

    <view class="warp">
      <!-- 文章列表模板 begin -->
      <template name="items">
        <navigator url="../../pages/detail/detail?id={{id}}" hover-class="navigator-hover">
          <view class="imgs">
            <image src="{{image}}" class="in-img" background-size="cover" model="scaleToFill"></image>
          </view>
          <view class="infos">
            <view class="title">{{name}}</view>
            <view class="dates">{{createtime}}</view>
          </view>
        </navigator>
      </template>
      <!-- 文章列表模板 end -->
    
      <!-- 循环输出列表 begin -->
      <view wx:for="{{newsList}}" class="list">
        <template is="items" data="{{...item}}" />
      </view>
      <!-- 循环输出列表 end -->
    
    
    <loading hidden="{{loadHidden}}" bindchange="loadChange">
        数据加载中...
    </loading>
    
      <view bindtap="loadMore" data-lastid="{{lastid}}" data-isfrist="{{isfrist}}" class="loadMore" style="display:{{moreHidden}}">加载更多</view>
      <toast hidden="{{toastHidden}}" bindchange="toastChange" duration="3000">{{msg}}</toast>
      <modal title="温馨提示" no-cancel confirm-text="明确"  cancel-text="关闭" hidden="{{confirmHidden}}" bindconfirm="modalChange" bindcancel="modalChange">你当前不在在WIFI网格下下,会产生流量费用</modal>
    </view>
    

    创建页面样式(lists.wxss)

    .warp {height:100%;display:flex;flex-direction: column;padding:20rpx;}
    navigator {overflow: hidden;}
    
    .list {margin-bottom:20rpx;height:200rpx;position:relative;}
    .imgs{float:left;}
    .imgs image {display:block;width:200rpx;height:200rpx;}
    
    .infos {float:left;width:480rpx;height:200rpx;padding:20rpx 0 0 20rpx}
    .title {font-size:20px; font-family: Microsoft Yahei}
    .dates {font-size:16px;color: #aaa; position: absolute;bottom:0;}
    
    .loadMore {text-align: center; margin:30px;color:#aaa;font-size:16px;}
    

    通过以上代码就能实现在屏幕上滑动显示数据的功能。为了更好的服务大家,请加入我们的技术交流群:(511387930),同时您也可以扫描下方的二维码关注我们的公众号,每天我们都会分享经验,谢谢大家。

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