微信小程序页面滑动屏幕加载数据效果

滑动屏幕加载数据是任何小程序中都会用到的功能,本文我就将这个功能整理给大家,希望对大家有意。我们先看看效果图:

创建目录

首先我们现在项目中创建资讯目录,以下是我自己创建的目录,大家可以根据自己的需求创建。如图所示:

创建lists.js文件

以下是lists.js代码

var app = getApp()

Page({

data: {

newsList: [],

lastid: 0,

toastHidden: true,

confirmHidden: true,

isfrist: 1,

loadHidden: true,

moreHidden: 'none',

msg: '没有更多文章了'

},

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: 'http://127.0.0.1:9090/hpm_bill_web/news/getnewslist', //数据接口

data: { lastid: lastid, limit: limit },

header: {

'Content-Type': 'application/json'

},

success: function (res) {

if (!res.data) {

that.setData({ toastHidden: false })

that.setData({ moreHidden: 'none' })

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('CmsList', newData)

}

that.setData({ newsList: newData })

that.setData({ moreHidden: '' })

},

fail: function (res) {

if (lastid == 0) {

var newData = wx.getStorageSync('CmsList')

if(newData) {

that.setData({ newsList: newData })

that.setData({ moreHidden: '' })

var len = newData.length

if (len != 0) {

that.setData({ lastid: newData[len - 1].id })

} else {

that.setData({ toastHidden: false })

}

console.log('data from cache');

}

} else {

that.setData({ toastHidden: false, moreHidden: 'none', msg: '当前网格异常,请稍后再试' })

}

},

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 != 'wifi' && isfrist == '1') {

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 })

}

})

创建页面文件(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>

创建页面样式(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;}

通过以上代码就能实现在屏幕上滑动显示数据的功能。

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