Mini program encapsulates the communication between custom components and parent-child components

Write sub-components (take the pop-up box as an example)

xml

<view class="popbg" wx:if="{
    
    {showPop}}">
  <text>{
    
    {
    
    popText}}</text>
</view>

css：

.popbg{
    
    
  width: calc(80% - 2rem);
  margin: 2rem 10% 0;
  padding: 0.7rem 1rem;
  background: #fff;
  border: 1px solid rgb(0,255,0);
  text-align: center;
  border-radius: 10rpx;
  position: fixed;
  top: 0;  
  left: 0;
  z-index: 100000;
}
.popbg text{
    
    
  color:  rgb(15, 161, 40);
}

Add the following configuration to the json file on this page

{
    
    
  "component":true 
}

Edit the js part of the component

Component({
    
    
  options: {
    
    
    multipleSlots: true // 在组件定义时的选项中启用多slot支持 
  }, 
  /**
 - 页面的初始数据
   */
  data: {
    
    
    showPop:true
  },
  properties: {
    
    
    popText: {
    
     
      type: String,  
      value: '组件默认内容'  
    },
  }, 
  /**
 - 在组件实例进入页面节点树时执行
   */
  attached() {
    
    
    var _this = this;
    console.log(1111)
    setTimeout(function () {
    
    
      _this.setData({
    
     showPop: false })
      _this.handleClose()
    }, 1000)
  },
  methods:{
    
    
    handleClose(){
    
    
      console.log("处理关闭内容")
      var showStatus={
    
    msg:'已成功关闭'}
      this.triggerEvent('myevent', showStatus)
    }
  }
  
})

After the child component is written, the parent component is introduced

Write the parent component

First register in json

{
    
    
  "usingComponents": {
    
    
    "pop": "../components/pop/infoShow"
  }
}

Multiple custom components can be introduced into one page. The writing method is as follows:
"usingComponents": { "pop": ".../components/pop/infoShow", "alert": ".../components/alert/alert" } You can also register global Components, "usingComponents" in app.json : { "pop": "…/components/pop/infoShow" }

Introduced in the xml file

<view class="container"> 
  <button type="primary" catchtap="clikShowPop">点击</button>
  <text style="margin-top:3rem;color:red" wx:if="{
    
    {showTips}}">{
    
    {
    
    childMsg}}</text>
  <pop id="popInfo" bind:myevent="showStatus" wx:if="{
    
    {showPop}}" popText="{
    
    {infoMsg}}"></pop>
</view>

The js part of the parent component:

Page({
    
    
  data: {
    
       
    infoMsg:'',
    popInfo:'',
    showPop:false,
    showTips:false,
    childMsg:''
  },
  //点击按钮事件
  clikShowPop(){
    
    
    this.setData({
    
    
      showPop: true,
      infoMsg:'点击成功',
    })
  },
  //弹框消失时触发父组件的事件
  showStatus(e){
    
    
    // console.log(JSON.stringify(e))
    this.setData({
    
    
      showTips:true,
      childMsg: e.detail.msg  //接受子组件传递的参数时要用e.detail去接收
    })
  },
 
  onLoad() {
    
    
    this.popInfo = this.selectComponent('#popInfo')   //获取组件对象，调用子组件内部函数时就可以用this.popInfo.handleClose()去调用了
  }  
})

So far, a simple custom component is encapsulated

Notes about custom components:

• Component Common page part is Page Custom component is Component
• options
• data: constants in the child component can be controlled by this.selectComponent('#popInfo')…setData({ showPop: false }) in the parent component
• properties is the value passed by the parent component to the child component
• attached is a life cycle function
• methods is the function encapsulated in the child component. The
  child component can call this.triggerEvent('myevent', data) to trigger the function of the parent component, similar to this.$emit('myevents',data) in vue, data is passed data. Parent and child bind functions through bind:myevent="showStatus", which is
  equivalent to @myevent="showStatus" in vue.
  About the life cycle of components: For
  
  more details, please see https://developers.weixin.qq.com/miniprogram/ dev/framework/custom-component/
  will not be described in detail here