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在列表数据的时候,一般都会有分页,因为如果一次性都加载出来的话,会造成卡顿的现象,浪费用户的流量,所以就会有下拉刷新,上拉加载。这里我们介绍两种实现微信小程序的下拉刷新,上拉加载的实现方式:
一、第一种实现方式:
1.官方文档:https://mp.weixin.qq.com/debug/wxadoc/dev/component/scroll-view.html?t=20161107
通过scroll-view(可滚动视图区域)的属性来实现的,bindscrolltoupper(滚动到顶部/左边,会触发 scrolltoupper 事件),bindscrolltolower(滚动到底部/右边,会触发 scrolltolower 事件),bindscroll()滚动时触发,event.detail = {scrollLeft, scrollTop, scrollHeight, scrollWidth, deltaX, deltaY}
2.效果图如下,
3.index.js中:
//index.js
//获取应用实例
const app = getApp();
const parentUrl = "http://apicloud.mob.com/v1/cook/menu/search?name=%E7%BA%A2%E7%83%A7%E8%82%89&cid=0010001007&key=17113fceca309&size=20&page=";
var curPage = 0;
var ctgTitles;
var thumbnail;
var isRefresh = true;
Page({
data: {
refresh_h: false,//刷新
load_h: true,//加载
line_h: true,//底线
scrollTop: 0,
},
onLoad: function () {
//微信的scroll-view必须要设置高度才能监听滚动事件,所以,需要在页面的onLoad事件中给scroll-view的高度赋值
var that = this;
wx.getSystemInfo({
success: (res) => {
this.setData({
windowHeight: res.windowHeight,
windowWidth: res.windowWidth
})
}
})
//设置第一次数据
GetList(that);
},
//页面滑动到顶部(下拉刷新)
topLoad: function (e) {
isRefresh = true;
curPage = 0;
var that = this;
that.setData({
list: [],
scrollTop: 0
})
GetList(that)
},
//页面滑动到底部(上拉加载)
downLoad: function (e) {
var that = this;
isRefresh = false;
GetList(that)
},
//设置竖向滚动条位置
scroll: function (event) {
this.setData({
scrollTop: event.detail.scrollTop
});
console.log(event.detail.scrollTop);
},
})
var GetList = function (that) {
if (isRefresh == true) {
//下拉刷新
that.setData({
refresh_h: false,
load_h: true,
});
} else {
//上拉加载
that.setData({
refresh_h: true,
load_h: false,
});
}
// 请求网络请求
wx.request({
url: parentUrl + curPage,
data: {
curPage: curPage,
ctgTitles: ctgTitles,
thumbnail: thumbnail,
},
method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
header: {
'content-type': 'application/json'
},// 设置请求的 header
success: function (res) {
console.log(that.data.list);
var list;
if (res.statusCode == 200) {
if (that.data.list == undefined) {
list = [];
} else {
list = that.data.list;
}
for (var i = 0; i < res.data.result.list.length; i++) {
list.push(res.data.result.list[i]);
}
that.setData({
list: list,
});
curPage++;
//这里判断了加载的页数大于10页,就显示底线
if (curPage > 10){
that.setData({
refresh_h: true,
load_h: true,
line_h: false,
});
}else{
that.setData({
refresh_h: true,
load_h: true,
line_h: true,
});
}
} else {
}
},
fail: function (res) {
},
complete: function () {
// complete
}
})
}
4.index.wxml中:
<loading hidden='{{refresh_h}}' bindchange="loadingChange">
刷新中...
</loading>
<scroll-view style="height: {{windowHeight}}px; width: {{windowWidth}}px;" bindscroll="scroll" scroll-y="true" scroll-top="{{scrollTop}}" bindscrolltoupper="topLoad" bindscrolltolower="downLoad">
<block wx:for="{{list}}" wx:key="listKey">
<view class="myView">
<image class="image" src="{{item.thumbnail}}"></image>
<view class="title">{{item.ctgTitles}}</view>
<view class="body">{{item.name}}</view>
</view>
</block>
</scroll-view>
<view class="line" hidden="{{line_h}}">--别太放肆,我是有底线的--</view>
<loading hidden="{{load_h}}" bindchange="loadingChange">
加载中...
</loading>
5.index.wxss中:
.image {
width: 200rpx;
height: 200rpx;
float: left;
}
.myView {
width: 100%;
float: left;
margin: 10px;
}
.title {
font-size: 12px;
padding-left: 10px;
padding-top: 15px;
float: left;
}
.body {
font-size: 10px;
float: left;
padding-left: 15px;
padding-right: 15px;
padding-top: 15px;
}
.line {
font-size: 12px;
width: 100%;
height: 50rpx;
text-align: center;
}
二、第二种实现方式:
1.官方文档:https://mp.weixin.qq.com/debug/wxadoc/dev/framework/app-service/page.html?t=20161107
2.效果图如下:
3.second.js中:
// pages/second/second.js
const parentUrl = "http://apicloud.mob.com/v1/cook/menu/search?name=%E7%BA%A2%E7%83%A7%E8%82%89&cid=0010001007&key=17113fceca309&size=20&page=";
var curPage = 0;
var ctgTitles;
var thumbnail;
var isFirst = true;
Page({
/**
* 页面的初始数据
*/
data: {
load_h: true,//加载
line_h: true,//底线
},
/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
//设置第一次数据
wx.startPullDownRefresh;
var that = this;
GetList(that);
},
/**
* 页面相关事件处理函数--监听用户下拉动作
*/
onPullDownRefresh: function () {
console.log("监听用户下拉动作");
var that = this;
curPage = 0;
isFirst = true;
that.setData({
list: [],
})
GetList(that);
},
/**
* 页面上拉触底事件的处理函数
*/
onReachBottom: function () {
console.log("监听用户上拉拉动作");
var that = this;
GetList(that);
},
})
var GetList = function (that) {
//设置加载提示窗是否显示
if (isFirst == true){
//第一次请求数据
that.setData({
load_h: true,
});
isFirst = false;
}else{
that.setData({
load_h: false,
});
}
// 请求网络请求
wx.request({
url: parentUrl + curPage,
data: {
curPage: curPage,
ctgTitles: ctgTitles,
thumbnail: thumbnail,
},
method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
header: {
'content-type': 'application/json'
},// 设置请求的 header
success: function (res) {
// console.log(that.data.list);
var list;
if (res.statusCode == 200) {
//成功停止刷新
wx.stopPullDownRefresh;
if (that.data.list == undefined) {
list = [];
} else {
list = that.data.list;
}
for (var i = 0; i < res.data.result.list.length; i++) {
list.push(res.data.result.list[i]);
}
that.setData({
list: list,
});
curPage++;
//这里判断了加载的页数大于10页,就显示底线
if (curPage > 10) {
that.setData({
load_h: true,
line_h: false,
});
} else {
that.setData({
load_h: true,
line_h: true,
});
}
} else {
}
},
fail: function (res) {
//失败停止刷新
wx.stopPullDownRefresh;
},
complete: function () {
// complete
}
})
}
4.second.wxml中:
<view>
<block wx:for="{{list}}" wx:key="listKey">
<view class="myView">
<image class="image" src="{{item.thumbnail}}"></image>
<view class="title">{{item.ctgTitles}}</view>
<view class="body">{{item.name}}</view>
</view>
</block>
</view>
<view class="line" hidden="{{line_h}}">--别太放肆,我是有底线的--</view>
<loading hidden="{{load_h}}" bindchange="loadingChange">
加载中...
</loading>
5.second.wxss中:
.line {
font-size: 12px;
width: 100%;
height: 50rpx;
text-align: center;
}
.image{
width: 95%;
margin: 20rpx;
}
.title{
font-size: 18px;
margin-left: 20rpx;
}
.body{
font-size: 16px;
margin-left: 20rpx;
}
6.second.json中:
{
"enablePullDownRefresh": true
}
7.demo地址:
本人菜鸟一个,有什么不对的地方希望大家指出评论,大神勿喷,希望大家一起学习进步!
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