微信小程序实现音乐搜索页面

前情提要

wx:if 和 hidden

wx:if 类似于Vue中的v-if，条件渲染；hidden 类似于Vue中的v-show，简单地控制显示与隐藏。

包装元素block

wx:if可以添加到一个标签上，可以添加到一组标签上。如果想用wx:if来控制一组标签，用将该组标签包装起来即可。

小程序项目

代码涉及的主要文件有：

1. pages/search/search.json
2. pages/search/search.wxml
3. pages/search/search.wxss
4. pages/search/search.js

pages/search.json

{
  "usingComponents": {},
  "navigationBarTitleText": "搜一搜",
  "navigationBarBackgroundColor": "#fff",
  "navigationBarTextStyle": "black"
}

pages/search.wxml

<view class="search-container">
  <view class="header">
    <view class="input-box">
      <image src="/static/images/search.png">image>
      <input type="text" placeholder="你想听的 这里都有~" placeholder-style="font-swxize:27rpx"
        bindinput="handleInput" value="{{keyword}}"/>
        <image src="/static/images/cross.png" bindtap="removeKeyword" hidden="{{!keyword}}">image>
    view>
  view>
  <block wx:if="{{keyword}}">
    <view class="search-container">
      <view class="search-title">搜索"{{keyword}}"view>
      <view class="search-list">
        <view class="search-item" wx:for="{{searchList}}" wx:key="id">
          <image src="/static/images/search.png">image>
          <view class="content">{{item.content}}view>
        view>
      view>
    view>
  block>
  <block wx:else>
    <view class="history-container" wx:if="{{historyList.length}}">
      <view class="history-header">
        <view class="history-title">搜索历史view>
        <image src="/static/images/delete.png" bindtap="deleteHistory">image>
      view>
      <view class="history-list">
        <text class="history-item" wx:for="{{historyList}}" wx:key="*this">{{item}}text>
      view>
    view>
    <view class="hot-container">
    <view class="hot-title">热搜榜view>
    <view class="hot-list">
      <view class="hot-item" wx:for="{{hotList}}" wx:key="id">
        <text class="order" style="{{(index===0 || index ===1 || index==2) && 'color:#d81e06' }}">{{index+1}}text>
        <text class="name">{{item.keyword}}text>
        <image wx:if="{{item.iconUrl}}" src="{{item.iconUrl}}">image>
      view>
    view>
  view>
  block>
view>

pages/search.wxss

.search-container{
  padding: 20rpx;
}
.input-box{
  background: #eee;
  border-radius: 28rpx;
  display: flex;
  align-items: center;
}
.input-box input{
  height: 60rpx;
  line-height: 60rpx;
  flex: 1;
  font-size: 27rpx;
}
.input-box image{
  width: 36rpx;
  height: 36rpx;
  padding: 0 20rpx;
}
.hot-container{
  margin: 20rpx 0;
}
.hot-container .hot-title{
  font-size: 26rpx;
  font-weight:550;
}
.hot-list{
  padding: 10rpx 0 ;
}
.hot-item{
  height: 60rpx;
  line-height: 60rpx;
  display: flex;
  align-items: center;
  margin-bottom: 20rpx;
}
.hot-item .order{
  display: inline-block;
  width: 40rpx;
  height: 60rpx;
  line-height: 60rpx;
  text-align: center;
  margin-right: 30rpx;
  color: #888;
}
.hot-item .name{
  font-weight: 550;
}
.hot-item image{
  width: 48rpx;
  height: 48rpx;
  margin-left: 20rpx;
}
.search-container .search-title{
  color: #d81e06;
  height: 80rpx;
  line-height: 80rpx;
  font-size: 28rpx;
}
.search-item{
  display: flex;
  align-items: center;
  height: 80rpx;
  line-height: 80rpx;
}
.search-item image{
  width: 28rpx;
  height: 28rpx;
  margin-right: 20rpx;
}
.search-item .content{
  flex:1;
  color: #666;
  font-size: 28rpx;
}
.history-container{
  margin-top: 20rpx;
}
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.history-header .history-title{
  font-size: 26rpx;
  font-weight:550;
}
.history-header image{
  width: 36rpx;
  height: 36rpx;
}
.history-list{
  display: flex;
  flex-wrap: wrap;
  padding: 20rpx 0;
}
.history-item{
  font-size: 26rpx;
  height: 36rpx;
  line-height: 36rpx;
  text-align: center;
  padding: 6rpx 16rpx;
  background: #eee;
  border-radius: 16rpx;
  margin: 0 20rpx 20rpx 0;
}

pages/search.js

const host = "http://localhost:3000"
let timer = null;

Page({
  data:{
    hotList:[],
    keyword:'',
    searchList:[],
    historyList:[]
  },
  onLoad(){
    this.getHotList();
    const historyList = wx.getStorageSync('historyList');
    if(historyList){
      this.setData({historyList})
    }
  },
  getHotList(){
    const result = [
      {id:"001",keyword:"周杰伦",iconUrl:host+"/images/hot-fill.png"},
      {id:"002",keyword:"最伟大的作品"},
      {id:"003",keyword:"林俊杰"},
      {id:"004",keyword:"孤勇者"},
      {id:"005",keyword:"再见莫妮卡"},
      {id:"006",keyword:"陈奕迅"},
      {id:"007",keyword:"李荣浩"},
      {id:"008",keyword:"毛不易"}
    ]
    this.setData({hotList:result})
  },
  handleInput(event){
    const keyword = event.detail.value.trim();
    if(!keyword) {
      this.setData({keyword:''});
      return;
    }
    this.throttle(this.getSearchList,500);

    const {historyList} = this.data;
    const index = historyList.indexOf(keyword);
    if(index > -1){
      historyList.splice(index,1);
    }
    const newHistoryList = [keyword,...historyList].slice(0,10) //最多显示10条搜索历史，且后来者居上
    wx.setStorageSync("historyList",newHistoryList)
    this.setData({
      keyword,
      historyList:newHistoryList
    });
  },
  throttle(fn,delay){
    if(timer != null) return;
    timer = setTimeout(() => {
      timer = null
      fn();
    },delay) 
  },
  getSearchList(){
    const result = [
      {id:"001",content:"周杰伦"},
      {id:"002",content:"周杰伦 最伟大的作品"},
      {id:"003",content:"周杰伦 爷爷泡的茶"},
      {id:"004",content:"周杰伦 珊瑚海"},
      {id:"005",content:"周杰伦 夜的第七章"},
      {id:"006",content:"周杰伦 说好不哭"},
      {id:"007",content:"周杰伦 等你下课"},
      {id:"008",content:"周杰伦 我是如此相信"}
    ]
    this.setData({searchList:result})
  },
  removeKeyword(){
    this.setData({keyword:'',searchList:[]})
  },
  deleteHistory(){
    this.setData({historyList:[]});
    wx.removeStorageSync('historyList');
  }
})

相关链接

条件渲染