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单击按钮时,如何从父组件打开位于子组件中的模态?

vuejs3 vue.js javascript

base · 技术社区 · 5 月前

家长有一个按钮。当点击按钮时,我们如何让子组件知道打开模式?

Parent.vue

<script setup>
import Child from "Child.vue";
</script>

<template>
  <button onClick=""> // open modal when button clicked
  <Child/>
</template>

孩子.vue

<script setup>
import { ref } from "vue";

const openModal = ref(false);
</script>

<template>
  <div>example</div>
</template>

1 回复 | 直到 5 月前

rozsazoltan 5 月前

与父级共享变量

在“子”组件中,您可以使用 defineExpose 发送 status 父级可访问的反应变量。

defineExpose() -Vue 3文档
defineExpose from component's <script setup> not working in Vue 3 -堆栈溢出

例子

Try with Playground

或实时CDN示例:

const { createApp, ref, defineExpose } = Vue;

// Child
const ChildComponent = {
  template: `
    <div v-if="status">
      <div>
        <p>Modal is open!</p>
        <button @click="closeModal">Close</button>
      </div>
    </div>
  `,
  setup() {
    const status = ref(false);

    const closeModal = () => {
      status.value = false;
    };

    defineExpose({ status });

    return { status, closeModal };
  }
};

// Parent
const App = {
  components: { ChildComponent },
  setup() {
    const childRef = ref(null);

    const openChildModal = () => {
      if (childRef.value) {
        childRef.value.status = true;
      }
    };

    return { childRef, openChildModal };
  }
};

createApp(App).mount("#app");

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>

<div id="app">
  <button @click="openChildModal">Open Modal</button>
  <child-component ref="childRef"></child-component>
</div>

通知家长某个事件

然而,我认为从组件中提取函数是不好的做法,就像给定的例子一样。组件应该是自包含的,在任何时候都可以完全重用,并且受外部因素的影响最小。因此,我将把打开和关闭按钮都放在子组件内,允许通过发射通知父组件他们的点击。

defineEmits() -Vue 3文档
@emit is not picked up by parent -堆栈溢出
Vue Composition API: Defining emits -堆栈溢出

您可以从子组件调用emit,当它被触发时,父组件将收到通知,允许您构建自定义函数作为响应。

例子

Try with Playground

或实时CDN示例:

const { createApp, ref, defineEmits } = Vue;

// Child
const ChildComponent = {
  template: `
    <button v-if="! status" @click="openModal">Open Modal</button>
    <div v-if="status">
      <div>
        <p>Modal is open!</p>
        <button @click="closeModal">Close</button>
      </div>
    </div>
  `,
  setup(_, { emit }) {
    const status = ref(false);

    const openModal = () => {
      status.value = true;
      emit('opened');
    };
    
    const closeModal = () => {
      status.value = false;
      emit('closed');
    };

    return { status, openModal, closeModal };
  }
};

// Parent
const App = {
  components: { ChildComponent },
  setup() {
    const customFnForChildOpen = () => {
      console.log('modal opened');
    };
    
    const customFnForChildClose = () => {
      console.log('modal closed');
    };

    return { customFnForChildOpen, customFnForChildClose };
  }
};

createApp(App).mount("#app");

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>

<div id="app">
  <child-component @opened="customFnForChildOpen" @closed="customFnForChildClose"></child-component>
</div>