小程序子组件向父组件传递数据

<!- 子组件wxml -->
<view class="child">
    <view class="child_item {{item.isActive===true?'active':''}}" 
     wx:for="test_data" 
     wx:key="id" 
     bindtap="handleTap"
data-index = {{index}} >{{item.name}}</view> </view>

 绑定点击事件, 子组件触发父组件的自定义事件 this.triggerEvent("事件名",参数)向父组件传递参数

//子组件js
Component({
    properties: {
        test_data:{
           type:Array,
           value:[]
        }
    },
    methods:{
       handleTap(e) {
          const index = e.currentTarget.dataset.index;
          this.triggerEvent("handlefatherEvent",index);
       }
    }
})

 

 

<!-- 父组件wxml -->
<child test_data="{{testData}}" bindhandleFatherEvent="handleFatherEvent">
</child>

 父组件绑定自定义事件,接收子组件传递数据

//父组件js
Page({ data:{ testData:[ {id:0,apple,isActive:true}, {id:1,banana,isActive:false}, {id:2,grape,isActive:false} ] }, handleFatherEvent(e) { const index = e.detail; let data = this.data.testData; data.forEach( (v,i)=>i===index? v.isActive=true:v.isActive=false) this.setData({testData}); } })

 

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