Vue component communication: use $destroy for component destruction communication

Vue component communication: Use $destroy for component destruction communication

In Vue development, component communication is a very important aspect. Vue provides a variety of ways to implement component communication, such as props, emit, vuex, etc. This article will introduce another method of component communication: using $destroy for component destruction communication.

In Vue, each component has a life cycle, which includes a series of life cycle hook functions. The destruction of components is also one of them. Vue provides a $destroy method for destroying components. By calling the $destroy method when a component is destroyed, we can trigger an event to notify other components to do some cleanup work or other operations.

The following is a simple example to demonstrate how to use $destroy for component destruction communication:

Parent.vue Parent component:

<template>
  <div>
    <h1>Parent Component</h1>
    <button @click="destroyChildComponent">Destroy Child Component</button>
    <ChildComponent v-if="showChildComponent" @destroy="handleChildComponentDestroy" />
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      showChildComponent: true
    };
  },
  methods: {
    destroyChildComponent() {
      this.showChildComponent = false;
    },
    handleChildComponentDestroy() {
      console.log('Child component has been destroyed');
      // 在这里可以做其他操作
    }
  }
}
</script>

ChildComponent.vue Child component:

<template>
  <div>
    <h2>Child Component</h2>
  </div>
</template>

<script>
export default {
  mounted() {
    // 监听组件销毁事件
    this.$once('hook:beforeDestroy', () => {
      this.$emit('destroy');
    });
  }
}
</script>

In this example, the parent component contains a button. Clicking the button will destroy the child component. The child component notifies the parent component by listening to its own beforeDestroy life cycle hook and triggering an $emit event before the component is destroyed. After receiving this event in the parent component, you can do some cleanup work or other processing.

It should be noted that we use the $once method in the subcomponent to listen to the beforeDestroy hook. This is because Vue's life cycle hook will be called before each component is destroyed. In order to avoid sending events repeatedly, we use $once to ensure that the listening only occurs once.

Using $destroy for component destruction communication makes it easy to perform some operations when the component is destroyed. For example, clear some timers, cancel subscriptions, etc. It is another useful way for Vue components to communicate and can take advantage of some special needs scenarios.

Summary:

This article introduces the method of using $destroy for component destruction communication. By triggering an event before the child component is destroyed, we can receive the event in the parent component and do some cleanup or other processing. This method can easily communicate when the component is destroyed, and is a useful way for Vue component communication. I hope that the examples in this article can help you understand and apply this component communication method.

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