问题描述
我想重构 this 教程中有关渲染函数的代码以使用 Composition API。除了 onClick 函数中的 context.emit("update:activeTabId",tab.props.tabId);
行外,一切正常。控制台记录 tab.props.tabId
显示 onClick 函数正常工作并正确读取 tabId,但 update:activeTabId
不会更新 activeTabId
值。是否有另一种方式在 Composition API 中使用同步修饰符发出事件,还是我做错了什么?
这是我的代码:
---- App.vue ----
<template>
<!-- eslint-disable-next-line -->
<tab-container v-model:activeTabId="activeTabId">
<tab tabId="1">Tab #1</tab>
<tab tabId="2">Tab #2</tab>
<tab tabId="3">Tab #3</tab>
<tab-content tabId="1">Content #1</tab-content>
<tab-content tabId="2">Content #2</tab-content>
<tab-content tabId="3">Content #3</tab-content>
</tab-container>
</template>
<script>
import {ref} from 'vue'
import {Tab,TabContent,TabContainer} from './components/tabs.js';
export default {
components: {
Tab,TabContainer
},setup() {
const activeTabId = ref('1');
return {
activeTabId,};
},};
</script>
--- tabs.js ---
import { h } from "vue";
export const TabContainer = {
props: {
activeTabId: {
type: String,required: true,},emits: ['update:activeTabId'],setup(props,context) {
const $slots = context.slots.default();
const tabs = $slots
.filter((x) => x.type === Tab)
.map((tab) =>
h(tab,{
class: {
tab: true,active: props.activeTabId === tab.props.tabId,onClick: () => {
console.log(tab.props.tabId)
context.emit("update:activeTabId",tab.props.tabId);
},})
);
const content = $slots.find(
(slot) =>
slot.props.tabId === props.activeTabId && slot.type === TabContent
);
return () => [
h(() => h("div",{ class: "tabs" },tabs)),h(() => h("div",content))
];
},};
const tabItem = (content) => ({
...content,props: {
tabId: {
type: String,setup(_,context) {
return () => h("div",context.slots.default())
}
});
export const Tab = tabItem({ name: "Tab" });
export const TabContent = tabItem({ name: "TabContent" });
解决方法
经过一些研究,我发现 this.state.users.push(newUser)
正在更新,但 TabContainer 不知何故不认为它是反应值,所以它没有改变。我已经用 activeTabId
监视 watchEffect
更改包装了所有 TabContainer 逻辑,现在它可以正常工作了!
https://codesandbox.io/s/solitary-currying-50ick?file=/src/App.vue