How to achieve the pull-down refresh and pull-up loading effect of the list in the WeChat applet?

This article mainly introduces the WeChat applet in detail to implement list pull-down refresh and pull-up loading. It has certain reference value. Interested friends can refer to it.

The examples in this article are shared with you. The specific code for the Android nine-square grid image display is for your reference. The specific content is as follows

DEMO download

Rendering

Principle

Use the onPullDownRefresh function (pull-down refresh listening function) and onReachBottom function (pull-up loading listening function) of the WeChat applet to monitor the pull-down and pull-up dynamics of the page, so as to monitor the page's pull-down and pull-up dynamics. Data is modified!

Page configuration JSON

• enablePullDownRefresh: enable pull-down refresh;

• onReachBottomDistance: page pull-up The distance from the bottom of the page when the bottom event is triggered, in px.

{
 "enablePullDownRefresh": true,
 "onReachBottomDistance": 50
}

WXML

 Item -- {{item}}

JS

Here setTimeout is used to simulate requesting data;
Loading data is limited to three times, and calling wx.showToast displays no More data.

Page({
 data: {
 dataList: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20],
 count : 0
 },
 onPullDownRefresh(){
 var self = this;
 setTimeout(() => {
  // 模拟请求数据，并渲染
  var arr = self.data.dataList, max = Math.max(...arr);
  for (var i = max + 1; i <= max + 3; ++i) {
  arr.unshift(i);
  }
  self.setData({ dataList: arr });
  // 数据成功后，停止下拉刷新
  wx.stopPullDownRefresh();
 }, 1000);
 },
 onReachBottom(){
 var arr = this.data.dataList, max = Math.max(...arr);
 if (this.data.count < 3) {
  for (var i = max + 1; i <= max + 5; ++i) {
  arr.push(i);
  }
  this.setData({
  dataList: arr,
  count: ++this.data.count
  });
 } else {
  wx.showToast({
  title: '没有更多数据了！',
  image: '../../src/images/noData.png',
  })
 }
 }
})

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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