微信小程序實現(xiàn)頁面下拉刷新和上拉加載功能詳解

更新時間：2018年12月03日 12:07:44 作者：kerryqpw

這篇文章主要介紹了微信小程序實現(xiàn)頁面下拉刷新和上拉加載功能,結合實例形式分析了微信小程序頁面下拉刷新和上拉加載相關事件監(jiān)聽與功能實現(xiàn)操作技巧,需要的朋友可以參考下

本文實例講述了微信小程序實現(xiàn)頁面下拉刷新和上拉加載功能。分享給大家供大家參考，具體如下：

web手機端或App中經(jīng)常會有下拉刷新，上拉加載這些功能。

微信小程序中如何實現(xiàn)下拉刷新，上拉加載的功能。

實現(xiàn)思路：

1.監(jiān)聽界面的下拉刷新事件和上拉加載事件

bindscrolltolower 監(jiān)聽上拉加載
bindscrolltoupper 監(jiān)聽下拉刷新

2.下拉刷新時清空數(shù)據(jù)列表，并重新請求數(shù)據(jù)進行界面展示。

3.上拉加載增量請求數(shù)據(jù)，增量增加數(shù)據(jù)列表，增量界面展示

效果圖：

實現(xiàn)代碼：

WaterFall.wxml:

<!--pages/WaterFall/WaterFall.wxml-->
<view style="display:none">
 <image wx:for="{{images}}" wx:key="id" id="{{item.id}}" src="{{item.pic}}" bindload="onImageLoad"></image>
</view>
<scroll-view scroll-y="true" style="height:{{scrollH}}px" bindscrolltolower="loadImages" bindscrolltoupper="PullDownRefresh">
 <view style="width:100%">
  <view class="img_item">
   <view wx:for="{{col1}}" wx:key="id">
    <image src="{{item.pic}}" style="width:100%;height:{{item.height}}px"></image>
   </view>
  </view>
  <view class="img_item">
   <view wx:for="{{col2}}" wx:key="id">
    <image src="{{item.pic}}" style="width:100%;height:{{item.height}}px"></image>
   </view>
  </view>
 </view>
</scroll-view>

WaterFall.js：

let col1H = 0;
let col2H = 0;
Page({
 data: {
  scrollH: 0,
  imgWidth: 0,
  loadingCount: 0,
  images: [],
  col1: [],
  col2: []
 },
 onLoad: function () {
  wx.getSystemInfo({
   success: (res) => {
    let ww = res.windowWidth;
    let wh = res.windowHeight;
    let imgWidth = ww * 0.48;
    let scrollH = wh;
    this.setData({
     scrollH: scrollH,
     imgWidth: imgWidth
    });
    //加載首組圖片
    this.loadImages();
   }
  })
 },
 PullDownRefresh:function(){
  console.log("頁面下拉2");
 },
  onShow: function () {
   console.log("頁面顯示");
 },
 /**
  * 生命周期函數(shù)--監(jiān)聽頁面隱藏
  */
 onHide: function () {
  console.log("頁面隱藏");
 },
 /**
  * 用戶點擊右上角分享
  */
 onShareAppMessage: function () {
  console.log("點擊分享");
 },
 onImageLoad: function (e) {
  let imageId = e.currentTarget.id;
  let oImgW = e.detail.width;     //圖片原始寬度
  let oImgH = e.detail.height;    //圖片原始高度
  let imgWidth = this.data.imgWidth; //圖片設置的寬度
  let scale = imgWidth / oImgW;    //比例計算
  let imgHeight = oImgH * scale;   //自適應高度
  let images = this.data.images;
  let imageObj = null;
  for (let i = 0; i < images.length; i++) {
   let img = images[i];
   if (img.id === imageId) {
    imageObj = img;
    break;
   }
  }
  imageObj.height = imgHeight;
  let loadingCount = this.data.loadingCount - 1;
  let col1 = this.data.col1;
  let col2 = this.data.col2;
  //判斷當前圖片添加到左列還是右列
  if (col1H <= col2H) {
   col1H += imgHeight;
   col1.push(imageObj);
  } else {
   col2H += imgHeight;
   col2.push(imageObj);
  }
  let data = {
   loadingCount: loadingCount,
   col1: col1,
   col2: col2
  };
  //當前這組圖片已加載完畢，則清空圖片臨時加載區(qū)域的內(nèi)容
  if (!loadingCount) {
   data.images = [];
  }
  this.setData(data);
 },
 loadImages: function () {
  let images = [
   { pic: "../../images/1.png", height: 0 },
   { pic: "../../images/2.png", height: 0 },
   { pic: "../../images/3.png", height: 0 },
   { pic: "../../images/4.png", height: 0 },
   { pic: "../../images/5.png", height: 0 },
   { pic: "../../images/6.png", height: 0 },
   { pic: "../../images/7.png", height: 0 },
   { pic: "../../images/8.png", height: 0 },
   { pic: "../../images/9.png", height: 0 },
   { pic: "../../images/10.png", height: 0 },
   { pic: "../../images/11.png", height: 0 },
   { pic: "../../images/12.png", height: 0 },
   { pic: "../../images/13.png", height: 0 },
   { pic: "../../images/14.png", height: 0 }
  ];
  console.log("dasddasd" + images);
  let baseId = "img-" + (+new Date());
  for (let i = 0; i < images.length; i++) {
   images[i].id = baseId + "-" + i;
  }
  this.setData({
   loadingCount: images.length,
   images: images
  });
 }
})

希望本文所述對大家微信小程序設計有所幫助。

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