[英]Vue.js: how to access injected value in computed method?
我使用提供/注入机制将数据从父级传递给孙级,但在我的一个组件中,我需要在将数据发送到模板之前对其进行处理。
所以我有:
export default defineComponent({
name: 'MrComponent',
inject: ["mydata"],
computed: {
processedData() {
const mydata = this.mydata;
return mydata + 1; // Some handling of the data here
}
}
})
但我收到以下错误:
[vue-cli-service] TS2339: Property 'mydata' does not exist on type 'CreateComponentPublicInstance<{ [x: string & `on${string}`]: ((...args: any[]) => any) | undefined; } | { [x: string & `on${string}`]: ((...args: never) => any) | undefined; }, { chartOptions: { responsive: boolean; maintainAspectRatio: boolean; cutout: string; borderWidth: number; }; }, ... 15 more ..., {}>'.
[vue-cli-service] Property 'mydata' does not exist on type '{ $: ComponentInternalInstance; $data: {}; $props: { [x: string & `on${string}`]: ((...args: any[]) => any) | undefined; } | { [x: string & `on${string}`]: ((...args: never) => any) | undefined; }; ... 10 more ...; $watch(source: string | Function, cb: Function, options?: WatchOptions<...> | undefined): WatchStopHan...'.
[vue-cli-service] 41 | computed: {
[vue-cli-service] 42 | chartData() {
[vue-cli-service] > 43 | const mydata = this.mydata;
[vue-cli-service] | ^^^^^^^^
[vue-cli-service] 44 | }
[vue-cli-service] 45 | }
[vue-cli-service] 46 | })
如果我在模板中访问mydata
,它可以工作:
<template>
{{ mydata }}
</template>
但是在显示之前我需要对 mydata 做一些其他的操作。 正确的方法是什么?
谢谢。
这对我来说似乎是一个 Vue 错误,因为应该从inject
选项(归档vuejs/core#5931
)自动检测到道具,但是有几个解决方法......
defineComponent
中的假道具类型如果您的组件没有props
,您可以通过在defineComponent()
的第一个类型参数中指定它来“伪造” mydata
道具:
export default defineComponent<{ mydata: number }>({
inject: ['mydata'],
computed: {
processedData() {
// `this.mydata` is number
}
}
})
但是,此解决方法很脆弱,因为它会在您添加props
选项后立即破坏类型。
将代码的相关部分切换到 Composition API(即inject()
和computed()
):
import { defineComponent, inject, computed } from 'vue'
export default defineComponent({
setup() {
const mydata = inject('mydata') as number
const processedData = computed(() => {
return mydata + 1
})
return {
processedData
}
}
})
您在寻找实用程序类型 - ComponentCustomProperties吗?
declare module 'vue' {
interface ComponentCustomProperties {
fastdata: {
user: {
nome: string,
tel: string,
pts: number,
nivel: number,
proximo_nivel: number,
tot_kg: number,
coleta: Array<any>,
},
noticias: Array<any>,
},
}
}
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