WeChat applet simulation drop-down menu development example

This article mainly shares with you the development examples of WeChat applet simulation drop-down menu, hoping to help everyone.

1. Knowledge points

1.Achieve dynamic display and hiding of a certain control

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  data:{
    open:false
  },
  showitem:function(){
      this.setData({
          open:!this.data.open
      })
  },

.display_show{
    display: block;
}
.display_none{
    display: none;
}

2.Passed data-* and e.target.dateset Pass parameters

283eed59fef83674640c93d96f3ff046{{firstPerson}}de5f4c1163741e920c998275338d29b2

## 8a6c9425929143cf888ccd17a8bbd489 Eatde5f4c1163741e920c998275338d29b2

    this.setData({
             firstPerson:e.target.dataset.me,
       })

At this time: firstPerson= Eat

3. Flexible box word: display:flex;

<view class="phone_one" bindtap="clickPerson">
    <view class="phone_personal">{{firstPerson}}</view>
    <image src="../../image/i.png" class="personal_image {{selectArea ? &#39;rotateRight&#39; :&#39;&#39;}}"></image>
</view>

At the parent level:

display:flex; justify -content:space-between;

This way the subsets will be juxtaposed. justify-content:space-between;This way the subsets will be at both ends

2. Events

(1). Drop-down list

##1.wxml

<view class="page">
    <view class="page_bd">
        <view class="body_head" bindtap="showitem">点击我显示下拉列表</view>
        <navigator url="pages/list/list">
        	<view class="{{open?&#39;display_show&#39;:&#39;display_none&#39;}}">列表1</view>
        </navigator>
        <navigator url="pages/scroll-view/index">
        	<view class="{{open?&#39;display_show&#39;:&#39;display_none&#39;}}">列表2</view>
        </navigator>
        <navigator url="pages/scroll-view/index">
        	<view class="{{open?&#39;display_show&#39;:&#39;display_none&#39;}}">列表3</view>
        </navigator>
    </view>
</view>

2.wxss

.page_bd{
    padding: 10px;
    background-color: snow;
}
.body_head{
    border: 1px solid;
    border-color: beige;
    padding: 10px;
}
.display_show{
    display: block;
    border: 1px solid;    
    border-color: beige;
    padding: 10px;
}
.display_none{
    display: none;
}

3.js

Page({
  data:{
    open:false
  },
  showitem:function(){
      this.setData({
          open:!this.data.open
      })
  },
  onLoad:function(options){
    // 页面初始化 options为页面跳转所带来的参数
  },
  onReady:function(){
    // 页面渲染完成
  },
  onShow:function(){
    // 页面显示
  },
  onHide:function(){
    // 页面隐藏
  },
  onUnload:function(){
    // 页面关闭
  }
})

##(2). Drop-down menu

1.wxml

<view class="phone_one" bindtap="clickPerson">
    <view class="phone_personal">{{firstPerson}}</view>
    <image src="../../image/i.png" class="personal_image {{selectArea ? &#39;rotateRight&#39; :&#39;&#39;}}"></image>
</view>

    
 

2.wxss

phone_personal{
  width: 100%;
  color:rgb(34, 154, 181);
  height:100rpx;
  line-height:100rpx;
  text-align: center;
}
.phone_one{
    display:flex;
    position:relative;
    justify-content:space-between;
    background-color:rgb(239, 239, 239);
    width:90%;
    height:100rpx;
    margin:22px auto;
    border-radius:10rpx;
    border-bottom:2rpx solid rgb(255, 255, 255);
    line-height:51px;
    padding-left:10px;
}
.person_box{
  position: relative;
}
.phone_select{
  margin-top:0;
  z-index: 100;
  position: absolute;
}
.select_one{
  text-align: center;
  background-color:rgb(239, 239, 239);
  width:676rpx;
  height:100rpx;
  line-height:100rpx;
  margin:0 5%;
  border-bottom:2rpx solid rgb(255, 255, 255);
}
.personal_image{
  z-index: 100;
  position: absolute;
  right:2.5%;
  width: 34rpx;
  height: 20rpx;
  margin:40rpx 20rpx 40rpx 0;
  transition: All 0.4s ease; 
  -webkit-transition: All 0.4s ease;
}
.rotateRight{
  transform: rotate(180deg);
}

3.js

Page({
  data:{
    selectPerson:true,
    firstPerson:'兴趣',
    selectArea:false,
  },
  //点击选择类型
  clickPerson:function(){
    var selectPerson = this.data.selectPerson;
    if(selectPerson == true){
        this.setData({
        selectArea:true,
        selectPerson:false,
      })
    }else{
      this.setData({
        selectArea:false,
        selectPerson:true,
      })
    }
  } ,
  //点击切换
  mySelect:function(e){
    this.setData({
      firstPerson:e.target.dataset.me,
      selectPerson:true,
      selectArea:false,
    })
  },
  onLoad:function(options){
  // 页面初始化 options为页面跳转所带来的参数
  },
  onReady:function(){
  // 页面渲染完成
  },
  onShow:function(){
  // 页面显示
  },
  onHide:function(){
  // 页面隐藏
  },
  onUnload:function(){
  // 页面关闭
  }
})

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