Detailed explanation of an example of sliding the screen to load data on the WeChat applet page-Mini Program Development-php.cn

Detailed explanation of an example of sliding the screen to load data on the WeChat applet page

黄舟

Release： 2018-05-29 15:00:15

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This article mainly introduces in detail the effect of sliding screen loading data on the WeChat applet page, which has certain reference value. Interested friends can refer to it

The sliding screen loading data is any small program There are functions that are commonly used in the program. In this article, I will organize this function for everyone. I hope it will be interesting to everyone. Let’s take a look at the renderings first:

Create directory

First we create an information directory in the project. The following is what I created myself Directory, you can create it according to your own needs. As shown in the picture:

Create lists.js file

The following is the lists.js code

var app = getApp()
Page({
 data: {
  newsList: [],
  lastid: 0,
  toastHidden: true,
  confirmHidden: true,
  isfrist: 1,
  loadHidden: true,
  moreHidden: &#39;none&#39;,
  msg: &#39;没有更多文章了&#39;
 },
 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: &#39;http://127.0.0.1:9090/hpm_bill_web/news/getnewslist&#39;, //数据接口
   data: { lastid: lastid, limit: limit },
   header: {
    &#39;Content-Type&#39;: &#39;application/json&#39;
   },
   success: function (res) {
    if (!res.data) {
     that.setData({ toastHidden: false })
     that.setData({ moreHidden: &#39;none&#39; })
     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(&#39;CmsList&#39;, newData)
     }
    that.setData({ newsList: newData })
    that.setData({ moreHidden: &#39;&#39; })
   },
   fail: function (res) {
    if (lastid == 0) {
     var newData = wx.getStorageSync(&#39;CmsList&#39;)
     if(newData) {
      that.setData({ newsList: newData })
      that.setData({ moreHidden: &#39;&#39; })
      var len = newData.length
      if (len != 0) {
       that.setData({ lastid: newData[len - 1].id })
      } else {
       that.setData({ toastHidden: false })
      }
      console.log(&#39;data from cache&#39;);
     }
     } else {
      that.setData({ toastHidden: false, moreHidden: &#39;none&#39;, msg: &#39;当前网格异常，请稍后再试&#39; })
     }
   },
   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 != &#39;wifi&#39; && isfrist == &#39;1&#39;) {
     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 })
 }
})

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Create page file (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>

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Create page style (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;}

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Through the above code, you can realize the function of sliding and displaying data on the screen.

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