微信小程序实战之上拉（分页加载）效果（2）

<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' "></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> 

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 "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(); 
 } 
 } 
}) 

function getSearchMusic(keyword, pageindex, callbackcount, callback){ 
 wx.request({ 
 url: 'https://c.y.qq.com/soso/fcgi-bin/search_for_qq_cp', 
 data: { 
  g_tk: 5381, 
  uin: 0, 
  format: 'json', 
  inCharset: 'utf-8', 
  outCharset: 'utf-8', 
  notice: 0, 
  platform: 'h5', 
  needNewCode: 1, 
  w: keyword, 
  zhidaqu: 1, 
  catZhida: 1, 
  t: 0, 
  flag: 1, 
  ie: 'utf-8', 
  sem: 1, 
  aggr: 0, 
  perpage: 20, 
  n: callbackcount, //返回数据的个数 
  p: pageindex, 
  remoteplace: 'txt.mqq.all', 
  _: Date.now() 
 }, 
 method: 'GET', 
 header: {'content-Type': 'application/json'}, 
 success: function(res){ 
  if(res.statusCode == 200){ 
  callback(res.data); 
  } 
 } 
 }) 
} 
 
module.exports = { 
 getSearchMusic: getSearchMusic 
} 

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(../../images/icon-loading.png) no-repeat; 
 background-size: contain; 
 animation: rotate 1s linear infinite; 
} 
.loading.complete:before{ 
 display: none; 
}