“我是新来的,在这里遇到了问题。我的顶级父是下面提到的这个页面代码,有2个子组件。就像{CURRENT PAGE..} > {FancyButton} > {AnotherViewChild}我想使用provide和inject将值从当前父组件传递到孙子组件AnotherViewChild组件,这可以通过以下代码实现,没有问题。但是如果我使用setTimeOut来延迟获取消息,我会得到[]值。
我如何才能得到解决这个问题?通常情况下,当大量数据来自后端时,可能会发生这种情况。我的演示消息数据就像... message.value = [{id:1,name:“ddl”},{id:2,name:“Omen ser”},{id:3、名称:“天然海”},.]`
<script setup lang="ts">
import { ref, provide, computed, onMounted } from 'vue'
import FancyButton from './FancyButton.vue'
let someValue: any[]
const message = ref<any[]>([])
message.value = [
{id: 1, name: "ddl"},
{id: 2, name: "Omen ser"},
{id: 3, name: "natural sea"},
{id: 4, name: "Whale is swiming"},
{id: 5, name: "Best food in"},
{id: 6, name: "Better choice"},
{id: 7, name: "What is next?"},
{id: 8, name: "Other Option"},
]
someValue = []
onMounted(() => {
setTimeout(() => {
message.value = [
{id: 1, name: "ddl"},
{id: 2, name: "Omen ser"},
{id: 3, name: "natural sea"},
{id: 4, name: "Whale is swiming"},
{id: 5, name: "Best food in"},
{id: 6, name: "Better choice"},
{id: 7, name: "What is next?"},
{id: 8, name: "Other Option"},
]
}, 2000)
})
console.log('-------->', message.value)
provide('message', message.value)
computed(() => {
console.log('-------->', someValue)
})
</script>
<template>
<div style="border: 1px solid purple">
<!-- <h1>Hello</h1>
<h2 style="color: red">{{ count }}</h2>
<button @click="addButton" style="color: red">Add</button> -->
<FancyButton>
<AnotherViewChild />
<div class="role">Role</div>
<div class="role">Role</div>
</FancyButton>
</div>
</template>
<style scoped>
.role {
color:green
}
.read-the-docs {
color: #888;
}
</style>
I am expecting if I use settimeout, data should be available after mentioned timeframe in message.value and can show in my child component <AnotherViewChild /> using provide, inject. Please help.
Expected screenshot
2条答案
按热度按时间fnatzsnv1#
如果我理解正确,你的目标是在父组件和孙组件之间延迟数据,我会这样做:
因为如果你在一个setString中赋值message.value,provide()函数将在message.value被赋值之前被调用。换句话说,当你的组件挂载时:
1.在调用provide()之后,message.value将在2秒后被赋值
z9ju0rcb2#
通过将provide()放置在根目录中并使用'message' provide('message',message)// deleted .value解决了问题