[英]How to run a method using v-for in Vue.js?
我想获得以下数据的以下输出。
・3
・1
和样本数据:
export const dummyData = [
{
id: "1",
name: "a",
sub: [
{
id: "1#1",
name: "b",
sub_sub: [
{ id: "1#1#1", name: "b-a" },
{ id: "1#1#2", name: "b-b" },
]
},
{
id: "1#2",
name: "c",
sub_sub: [
{ id: "1#2#1", name: "c-a" },
]
},
]
},
{
id: "2",
name: "d",
sub: [
{
id: "2#1",
name: "e",
sub_sub: [
{ id: "1#2#1", name: "e-a" },
]
}
]
},
]
我想计算对象“a”和“d”中包含多少个sub_sub
元素。 所以,我做了以下代码。
<template>
<div>
<ul>
<li v-for="item in items" :key="item.i">{{rowSpanCalc(item.id)}}</li>
</ul>
</div>
</template>
<script lang="ts">
import { Component, Vue } from 'nuxt-property-decorator'
import { dummyData } from '~/store/dummy'
@Component({})
export default class extends Vue {
items: any = []
created() {
this.items = dummyData
}
rowSpanCalc(item: any) {
const count = item.sub.reduce(
(total: any, curr: any) => total + curr.sub_sub.length,
0
)
return count;
}
}
</script>
我运行了我的代码并在控制台中出现了一个错误,例如
item.sub.reduce 不是函数
谁能告诉我如何解决这个错误?
模板中的方法用作事件处理程序而不是用于渲染,尝试在计算属性中使用该方法,然后使用该属性来渲染您的项目:
@Component({})
export default class extends Vue {
items: any = []
created() {
this.items = dummyData
}
get customItems(){
return this.items.map(item=>({...item,count:this.rowSpanCalc(item.id)}))
}
rowSpanCalc(item: any) {
const count = item.sub.reduce(
(total: any, curr: any) => total + curr.sub_sub.length,
0
)
return count;
}
}
模板 :
...
<li v-for="item in customItems" :key="item.id">{{item.count}}</li>
...
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