How to use provide and inject for component communication in Vue?

How to use provide and inject for component communication in Vue?

In Vue, communication between components is a very important issue. Vue provides a variety of methods to pass data and communicate between components. In some specific scenarios, using provide and inject is a very convenient and efficient way to achieve communication between components.

provide and inject are a pair of matching options that allow ancestor components to inject a dependency into all descendant components without manually passing it layer by layer. They can form a "dependency injection tree" between ancestors and descendants.

Components that provide dependencies use the provide option, and components that receive dependencies use the inject option.

Let's look at an example below. Suppose there is a parent component A and two child components B and C. We need to pass the data in the parent component A to the child components B and C.

The code of parent component A is as follows:

<template>
  <div>
    <child-b></child-b>
    <child-c></child-c>
  </div>
</template>

<script>
import ChildB from './ChildB.vue'
import ChildC from './ChildC.vue'

export default {
  components: {
    ChildB,
    ChildC
  },
  provide() {
    return {
      dataFromA: this.dataFromA
    }
  },
  data() {
    return {
      dataFromA: 'Hello'
    }
  }
}
</script>

Child component B can receive the data provided by parent component A through the inject option. The code is as follows:

<template>
  <div>
    <p>Child B</p>
    <p>Data from A: {{ dataFromA }}</p>
  </div>
</template>

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

Similarly, the child component Component C can also receive the data provided by parent component A through the inject option. The code is as follows:

<template>
  <div>
    <p>Child C</p>
    <p>Data from A: {{ dataFromA }}</p>
  </div>
</template>

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

In this way, the data "dataFromA" provided by parent component A will be automatically injected into child components B and C. Components B and C can use this data directly.

It should be noted that provide and inject can only be used for communication between ancestor components and descendant components, not for communication between sibling components.

The above is a simple example of using provide and inject for component communication. Using provide and inject can effectively reduce the complexity of transferring data between components and improve the maintainability and reusability of the code. In some specific scenarios, using provide and inject is a very convenient and efficient way of component communication.

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