本文实例讲述了微信小程序实现页面下拉刷新和上拉加载功能。分享给大家供大家参考，具体如下：
web手机端或app中经常会有下拉刷新，上拉加载这些功能。
微信小程序中如何实现下拉刷新，上拉加载的功能。
实现思路：
1.监听界面的下拉刷新事件和上拉加载事件
2.下拉刷新时清空数据列表，并重新请求数据进行界面展示。
3.上拉加载增量请求数据，增量增加数据列表，增量界面展示
效果图：
实现代码：
waterfall.wxml:
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<!--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
});
//加载首组图片
this.loadimages();
}
})
},
pulldownrefresh:function(){
console.log("页面下拉2");
},
onshow: function () {
console.log("页面显示");
},
/**
* 生命周期函数--监听页面隐藏
*/
onhide: function () {
console.log("页面隐藏");
},
/**
* 用户点击右上角分享
*/
onshareappmessage: function () {
console.log("点击分享");
},
onimageload: function (e) {
let imageid = e.currenttarget.id;
let oimgw = e.detail.width; //图片原始宽度
let oimgh = e.detail.height; //图片原始高度
let imgwidth = this.data.imgwidth; //图片设置的宽度
let scale = imgwidth / oimgw; //比例计算
let imgheight = oimgh * scale; //自适应高度
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;
//判断当前图片添加到左列还是右列
if (col1h <= col2h) {
col1h += imgheight;
col1.push(imageobj);
} else {
col2h += imgheight;
col2.push(imageobj);
}
let data = {
loadingcount: loadingcount,
col1: col1,
col2: col2
};
//当前这组图片已加载完毕，则清空图片临时加载区域的内容
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
});
}
})
希望本文所述对大家微信小程序设计有所帮助。
如对本文有疑问， 点击进行留言回复！！
offset、client、scroll (width,height、left,top、X,Y)
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