父組件頁面是carts.wxml 子頁面是product.html
子組件wxml代碼
<view class='cartAllSel' bindtap="bindSelectAll" >
<icon wx:if="{{selectedAllStatus}}" class='iconDel' type='success' color='#4D4D4D' size="20" ></icon>
<icon class='iconDel' wx:else type="circle" size="20"></icon>
<text class='product-title'>全選</text>
</view>
子組件js代碼
methods: {
//購物車全選
bindSelectAll: function (e) {
var that =this;
var allChecked = !this.data.selectedAllStatus;
var carts = this.data.productList;
for (var i = 0; i < carts.length; i++) {
carts[i].selected = allChecked;
}
if (allChecked){
this.data.checkedNum = carts.length;
}else{
this.data.checkedNum=0;
}
//需要添加部分,traCheckedNum是父頁面調用需要
var checkeddata = { checkedNum: this.data.checkedNum};
this.triggerEvent("traCheckedNum", checkeddata )
this.setData({
productList: carts,
selectedAllStatus: allChecked,
})
},
}
父頁面 carts.wxml
需要在子組件處添加 bind:traCheckedNum="checkNum" checkNum是父js中的方法
<ProductList bind:traCheckedNum="checkNum" productList="{{cartList}}" listType="{{'cart'}}"></ProductList>
父頁面 carts.js
注意checkNum方法是不能寫在Methods中不然小程序會報找不到該組件,就和data平級就可以
checkNum: function (e) {
this.setData({
checkedNum: e.detail.checkedNum,
})
console.log(e.detail.checkedNum)
}
父頁面carts.wxml引用值
<view>已選 {{checkedNum}}</view>