转眼间我们教你微信小程序系列已经有十节系列课程了,每天的工作压力繁重,小女子也不知道自己还能坚持这样的系列教程多久。只希望每篇教程真的对大家有帮助。这节课我们要介绍的就是如何实现分页的下拉加载,我们先来看效果图
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主要的页面结果如下:
1.index.wxml
<view class="search"> <view class="search-bar"> <view class="search-wrap"> <icon type="search" size="16" class="icon-search" /> <input type="text" placeholder="请输入搜索内容" class="search-input" name="searchKeyword" bindinput="bindKeywordInput" value="{{searchKeyword}}" /> </view> <view class="search-cancel" bindtap="keywordSearch">搜索</view> </view> <view class="search-result"> <scroll-view scroll-y="true" bindscrolltolower="searchScrollLower"> <view class="result-item" wx:for="{{searchSongList}}" wx:key="unique" data-data="{{item}}" > <view class="icon{{item.isonly=='0' ? ' nocopyright' : ''}}"></view> <text class="title">{{item.songname}}</text> <view class="subtitle"> <text wx:for="{{item.singer}}" wx:key="unique">{{item.name}}</text> </view> </view> <view class="loading" hidden="{{!searchLoading}}">正在载入更多...</view> <view class="loading complete" hidden="{{!searchLoadingComplete}}">已加载全部</view> </scroll-view> </view> </view>
2.index.wxss
page{ display: flex; flex-direction: column; height: 100%; } /*搜索*/ .search{ flex: auto; display: flex; flex-direction: column; background: #fff; } .search-bar{ flex: none; display: flex; align-items: center; justify-content: space-between; padding: 20rpx; background: #f4f4f4; } .search-wrap{ position: relative; flex: auto; display: flex; align-items: center; height: 80rpx; padding: 0 20rpx; background: #fff; border-radius: 6rpx; } .search-wrap .icon-search{ margin-right: 10rpx; } .search-wrap .search-input{ flex: auto; font-size: 28rpx; } .search-cancel{ padding: 0 20rpx; font-size: 28rpx; } /*搜索结果*/ .search-result{ flex: auto; position: relative; } .search-result scroll-view{ position: absolute; bottom: 0; left: 0; right: 0; top: 0; } .result-item{ position: relative; display: flex; flex-direction: column; padding: 20rpx 0 20rpx 110rpx; overflow: hidden; border-bottom: 2rpx solid #e5e5e5; } .result-item .media{ position: absolute; left: 16rpx; top: 16rpx; width: 80rpx; height: 80rpx; border-radius: 999rpx; } .result-item .title, .result-item .subtitle{ overflow: hidden; text-overflow: ellipsis; white-space: nowrap; line-height: 36rpx; } .result-item .title{ margin-bottom: 4rpx; color: #000; } .result-item .subtitle{ color: #808080; font-size: 24rpx; } .result-item:first-child .subtitle text{ margin-right: 20rpx; } .result-item:not(:first-child) .subtitle text:not(:first-child):before{ content: '/'; margin: 0 8rpx; } .loading{ padding: 10rpx; text-align: center; } .loading:before{ display: inline-block; margin-right: 5rpx; vertical-align: middle; content: ''; width: 40rpx; height: 40rpx; background: url(../index/images/icon-loading.png) no-repeat; background-size: contain; animation: rotate 1s linear infinite; } .loading.complete:before{ display: none; }
3.index.js
var util = require('../../utils/util.js') Page({ data: { searchKeyword: '', //需要搜索的字符 searchSongList: [], //放置返回数据的数组 isFromSearch: true, // 用于判断searchSongList数组是不是空数组,默认true,空的数组 searchPageNum: 1, // 设置加载的第几次,默认是第一次 callbackcount: 15, //返回数据的个数 searchLoading: false, //"上拉加载"的变量,默认false,隐藏 searchLoadingComplete: false //“没有数据”的变量,默认false,隐藏 }, //输入框事件,每输入一个字符,就会触发一次 bindKeywordInput: function(e){ console.log("输入框事件") this.setData({ searchKeyword: e.detail.value }) }, //搜索,访问网络 fetchSearchList: function(){ let that = this; let searchKeyword = that.data.searchKeyword,//输入框字符串作为参数 searchPageNum = that.data.searchPageNum,//把第几次加载次数作为参数 callbackcount =that.data.callbackcount; //返回数据的个数 //访问网络 util.getSearchMusic(searchKeyword, searchPageNum,callbackcount, function(data){ console.log(data) //判断是否有数据,有则取数据 if(data.data.song.curnum != 0){ let searchList = []; //如果isFromSearch是true从data中取出数据,否则先从原来的数据继续添加 that.data.isFromSearch ? searchList=data.data.song.list : searchList=that.data.searchSongList.concat(data.data.song.list) that.setData({ searchSongList: searchList, //获取数据数组 zhida: data.data.zhida, //存放歌手属性的对象 searchLoading: true //把"上拉加载"的变量设为false,显示 }); //没有数据了,把“没有数据”显示,把“上拉加载”隐藏 }else{ that.setData({ searchLoadingComplete: true, //把“没有数据”设为true,显示 searchLoading: false //把"上拉加载"的变量设为false,隐藏 }); } }) }, //点击搜索按钮,触发事件 keywordSearch: function(e){ this.setData({ searchPageNum: 1, //第一次加载,设置1 searchSongList:[], //放置返回数据的数组,设为空 isFromSearch: true, //第一次加载,设置true searchLoading: true, //把"上拉加载"的变量设为true,显示 searchLoadingComplete:false //把“没有数据”设为false,隐藏 }) this.fetchSearchList(); }, //滚动到底部触发事件 searchScrollLower: function(){ let that = this; if(that.data.searchLoading && !that.data.searchLoadingComplete){ that.setData({ searchPageNum: that.data.searchPageNum+1, //每次触发上拉事件,把searchPageNum+1 isFromSearch: false //触发到上拉事件,把isFromSearch设为为false }); that.fetchSearchList(); } } })
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