开发一个微信小程序(7)：查询天气添加热门城市

前面查询天气时，都是在输入框输入城市名，然后点击查询触发请求

本篇添加一下热门城市，点击城市后能够显示该城市的天气状况

拆解一下接下来要做的事情：

（1）前端页面中需要列出热门城市；

（2）点击热门城市后，当前城市高亮，同时触发请求，显示所选城市天气；

1、前端添加热门城市

<view style="margin-top: 40rpx;margin-left: 20rpx;"><text>热门城市：</text></view>
<view class="cards">
    <view class="{{id=='1'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="广州" data-id="1">广州</view>
    <view class="{{id=='2'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="北京" data-id="2">北京</view>
    <view class="{{id=='3'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="深圳" data-id="3">深圳</view>
    <view class="{{id=='4'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="南京" data-id="4">南京</view>
    <view class="{{id=='5'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="武汉" data-id="5">武汉</view>
    <view class="{{id=='6'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="杭州" data-id="6">杭州</view>
    <view class="{{id=='7'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="成都" data-id="7">成都</view>
    <view class="{{id=='8'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="西安" data-id="8">西安</view>
    <view class="{{id=='9'?'choose':'cards__item'}}" bindtap="hotcitywwather" data-city="三亚" data-id="9">三亚</view>
</view>

每一个<view>标签中都绑定了一个hotcitywwather事件，同时传递2个参数：city和id，使用data-*方式传递参数

为了实现点击城市后，城市变高亮，每个<view>标签中的class属性根据id值选择，

例如广州，如果广州被选中，我会在后台把id置为1，而当id=1时，它的class=choose，否则class=cards_item

这样就实现了--选中元素样式和未选中元素样式不同的目的

2、后端添加hotcitywwather方法

//热门城市触发的查询请求
  hotcitywwather(e) {
    console.log(e);
    this.setData({
      id: e.target.dataset.id  // 点击城市，激活这个事件，把id参数置为传递来的值
    })
    //获取locationid
    wx.request({
      url: 'https://geoapi.qweather.com/v2/city/lookup', 
      method: 'GET',
      data: {
        key: this.data.key,
        location: e.target.dataset.city  //取前端点击的热门城市，因为前端点击事件传递了这个参数
      },
      success: (res) => {
        console.log(res);
        // return res.data.location[0].id
        this.setData({
          location: res.data.location[0].id  //提取返回结果中的id
        })

        // 获取locationid后，查询当前天气，在success中发起请求
        var location_id = this.data.location;
        // console.log(location_id);
        wx.request({
          url: 'https://devapi.qweather.com/v7/weather/now', 
          method: 'GET',
          data: {
            key: this.data.key,
            location: location_id
          },
          success: (res) => {
            console.log(res);
            this.setData({
              weather_now: res.data.now,
              flag: true
            })
          },
        });
          // 获取locationid后，查询未来3天气，在success中发起请求
          wx.request({
            url: 'https://devapi.qweather.com/v7/weather/3d', 
            method: 'GET',
            data: {
              key: this.data.key,
              location: location_id
            },
            success: (res) => {
              console.log(res);
              this.setData({
                future: res.data.daily,
                flag: true
              })
            },
      
          });

          // 获取locationid后，查询未来24小时天气，在success中发起请求
          wx.request({
            url: 'https://devapi.qweather.com/v7/weather/24h', 
            method: 'GET',
            data: {
              key: this.data.key,
              location: location_id
            },
            success: (res) => {
              console.log(res);
              this.setData({
                twenty_four: res.data.hourly,
                flag: true
              })
            },
       
          });

          // 获取locationid后，查询天气指数
          wx.request({
            url: 'https://devapi.qweather.com/v7/indices/1d', 
            method: 'GET',
            data: {
              key: this.data.key,
              location: location_id,
              type: 3
            },
            success: (res) => {
              console.log(res);
              this.setData({
                indices: res.data.daily,
                flag: true
              })
            },
  
          });
      },
    })
  },

 完整样式文件 pages/weather/weather.wxss

查看代码

/* pages/weather/weather.wxss */


.title {
  display: flex;
  justify-content: center;
  margin-top: 40rpx;
  
}
.title text {
  font-family: sans-serif;
  font-size: 36rpx;
  font-weight: bold;  /*加粗*/
  letter-spacing: 4rpx; /*字符之间的间距*/

}

.search {
  display: flex;
  justify-content: center;
  
}
/* .search-container {
  height: 88rpx;
  background-color: #ada5a5;
  display: flex;
  align-items: center;
  padding: 0 10rpx;
} */

.search-container  {
  font-size: 28rpx;
  margin-top: 20rpx;
  margin-left: 20rpx;
  height: 60rpx;
   50%;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;  /*光标居中，在input标签下设置这个即可*/
  border-radius: 8px;
  background: #ffffff;
  box-shadow: inset 5px 5px 10px #cccccc,
              inset -5px -5px 10px #ffffff;
}


.placeho {
  font-size: 22rpx;
  color: rgb(152, 153, 155);
  text-align: center;
}

.search-button {
  margin-left: 60rpx;
  margin-top: 20rpx;
  height: 55rpx;
   120rpx;
  border-radius: 8px;
  background: linear-gradient(145deg, #e6e6e6, #ffffff);
  box-shadow:  18px 18px 24px #e2e0e0,
              -18px -18px 24px #ffffff;
  display: flex;
  /* flex-wrap: wrap; */
  justify-content: center;
}

.search-button view {
  font-size: 28rpx;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-button image{
  height: 34rpx;
   34rpx;
  margin-left: 5rpx;
}

.search-button text{
  font-size: 26rpx;
}

/* 热门城市 样式*/
.cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}
.cards__item {
  display: flex;
  flex-basis: 25%;
  /* padding-left: 8px;
  padding-right: 8px; */
  margin: 20rpx 0 0 20rpx;
  justify-content: center;
  align-items: center;
  height: 60rpx;
  /*  1000rpx; */
  border: 1rpx solid rgb(211, 210, 210);
  font-size: 24rpx;
  border-radius: 8px;
  background: linear-gradient(145deg, #d8d8d8, #ffffff);
  box-shadow:  18px 18px 24px #e2e0e0,
              -18px -18px 24px #ffffff;
}
.choose {
  display: flex;
  flex-basis: 25%;
  /* padding-left: 8px;
  padding-right: 8px; */
  margin: 20rpx 0 0 20rpx;
  justify-content: center;
  align-items: center;
  height: 60rpx;
  /*  1000rpx; */
  border: 1rpx solid rgb(211, 210, 210);
  font-size: 24rpx;
  color: white;
  border-radius: 8px;
  background: #0cb5df;
box-shadow:  14px 14px 59px #fcfdfd,
             -14px -14px 59px #e6f0f5;
}

/* 实时天气样式 */
.top-box {
  border-radius: 5px;
  background: #ace3fb;
  box-shadow: inset 6px 6px 12px #92c1d5,
            inset -6px -6px 12px #c6ffff;
  height: 100%;
  margin-left: 20rpx;
  margin-right: 20rpx;
}
.weather-image {
  margin-top: 20rpx;
  
  padding-top: 40rpx;
  /*  100%; */
  
  display: flex;
  justify-content: center;
  
}

/* 调整天气图标大小 */
.weather-image image {
   150rpx;
  height: 150rpx;
  filter: drop-shadow(red);
}
/* 调整文本位置 */
.weather-text {
  margin-left: 50rpx;
  display: flex;
  flex-direction: column; 
}

.weather-text text {
   margin: 4rpx;
}
.indices {
  display: flex;
  justify-content: center;
  font-size: 26rpx;
  margin: 50rpx 30rpx 0 30rpx;
}
.next {
  margin-top: 60rpx;
  white-space: nowrap;
  /* display: flex;
  justify-content: center; */
}

.next-son {
  /* align-items: center;
  justify-content: center; */
   20%;
  display: inline-block;
  margin-bottom: 20rpx;
  
}
.next-son text {
  font-size: 26rpx;
}
.next-son image {
   40rpx;
  height: 40rpx;
  margin: 15rpx 0 15rpx 0;
}

.next-son view {
  display: flex;
  flex-direction: column; 
  align-items: center;
  justify-content: center; 
}

/* 未来3天天气的样式 */
.future-3d-father {
  margin-top: 20rpx;
  display: flex;
  /* flex-wrap: wrap; */
  justify-content: center;
  height: 100%;
  margin-left: 20rpx;
  margin-right: 20rpx;
  padding-bottom: 20rpx;  /*里面填充*/
  margin-bottom: 40rpx;  /*外壳距底部*/
  border-radius: 5px;
  background: #ace3fb;
  box-shadow: inset 6px 6px 12px #92c1d5,
            inset -6px -6px 12px #c6ffff;
}
.future-3d-father view {
  
}
.future-3d-son1  {
  margin-top: 40rpx;
   33.33%;
  
  /* height: 100rpx; */
  /* display: flex; */
  
  align-items: center;
  justify-content: center;
}
.future-3d-son2 {
  margin-top: 40rpx;
   33.33%;
  /* height: 220rpx; */
  /* display: flex; */
  align-items: center;
  justify-content: center;
  border-left: 1rpx dashed black;
  border-right: 1rpx dashed black;
}

.future-3d-son3 {
  margin-top: 40rpx;
   33.33%;
  /* height: 100rpx; */
  /* display: flex; */
  align-items: center;
  justify-content: center; 
}

.future-3d-son1 view {
  display: flex;
  flex-direction: column;  /*使元素纵向布局（默认为横向）*/
  align-items: center;
  justify-content: center; 
}

.future-3d-son2 view {
  display: flex;
  flex-direction: column;  /*使元素纵向布局（默认为横向）*/
  align-items: center;
  justify-content: center; 
}

.future-3d-son3 view {
  display: flex;
  flex-direction: column;  /*使元素纵向布局（默认为横向）*/
  align-items: center;
  justify-content: center; 
}

.future-3d-father image {
   50rpx;
  height: 50rpx;
  margin: 15rpx 0 15rpx 0;
}
.banquan {
  height: 20rpx;
}