How to use provide/inject in Vue to implement method transfer between ancestor components and descendant components

Vue, as a popular front-end framework, provides a variety of methods to organize and manage interactions between components. In Vue, provide and inject are two methods that can be used to implement method transfer between ancestor components and descendant components.

provide and inject are methods for communication between advanced components provided by Vue. Their function is to provide data to ancestor components, and then use the inject method to receive data in descendant components.

1. Definition of provide and inject

provide and inject are new features in Vue.js 2.2.0. They are alternatives for communication between parent and child components.

The provide option can be an object or a function that returns an object, and its role is to define the data you provide. The inject option can be an array or an object, where the array member is a string, representing the property you need to inject. The key of the object member represents the name of the local binding, and the key value is the key provided by its parent component.

2. Usage scenarios of provide and inject

Using provide and inject can be used in the following scenarios:

• Communication between multi-level nested components;
• Ancestral components can pass data and methods to descendant components;
• Avoid using simple state management of vuex.

Using vuex can manage global status and solve the problem of status management between multiple components. However, for simple status management scenarios, it is simpler and more effective to use provide and inject communication methods.

3. Implementation of provide and inject

The following is an example to introduce the implementation of provide and inject:

1. In the parent component App.vue, Use the provide method to provide the method setData:

<template>
  <div>
    <child-comp :setData="setData"></child-comp>
  </div>
</template>

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

export default {
  components: {
    ChildComp
  },
  provide() {
    return {
      setData: this.setData
    }
  },
  data() {
    return {
      text: 'Hello World'
    }
  },
  methods: {
    setData() {
      this.text = 'Vue.js is awesome';
    }
  }
}
</script>

2. In the sub-component ChildComp.vue, use the inject method to receive the setData method and call the setData method in the component:

<template>
  <div>
    <button @click="setData()">修改文本</button>
  </div>
</template>

<script>
export default {
  inject: ['setData']
}
</script>

3. Click the button in the child component and change the text attribute in the parent component by calling the setData method provided by the parent component.

4. Notes on provide and inject

Although using provide and inject is simple and convenient, you need to pay attention to the following points:

• provide and inject It is not responsive. When the data provided by the parent component changes, the child component will not automatically update;
• You need to pay attention to the naming conflict between provide and inject to prevent naming conflicts from causing data transfer errors;
• The attributes injected by provide and inject in different ancestors are different, so you need to pay attention to the source of the attributes.

5. Summary

This article introduces how to use provide and inject in Vue to implement method transfer between ancestor components and descendant components. Using provide and inject can achieve simple component communication, avoid using vuex's simple state management, and improve development efficiency. However, you need to note that provide and inject are not responsive, and you need to pay attention to the naming conflict between provide and inject.

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