How to share and transfer data in Vue components

How to realize data sharing and transfer in Vue components

In Vue, components are the core part of building web applications. Within components, the sharing and transfer of data is very important. This article will introduce in detail how to share and transfer data in Vue components, and provide specific code examples.

Data sharing refers to the sharing of the same data between multiple components. Data sharing can be achieved even if these components are located in different hierarchies. The transfer of data refers to passing data from one component to another component, usually through the transfer between parent and child components.

1. Data Sharing

1.1 Using Vuex

Vuex is a state management mode provided by Vue, which can easily enable multiple components to share the same copies of data. The following is a simple example of using Vuex to achieve data sharing:

// store.js
import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++
    }
  }
})

// App.vue
<template>
  <div>
    <h1 id="count">{{ count }}</h1>
    <button @click="increment">Increment</button>
  </div>
</template>

<script>
export default {
  computed: {
    count() {
      return this.$store.state.count
    }
  },
  methods: {
    increment() {
      this.$store.commit('increment')
    }
  }
}
</script>

In the above example, we share data by importing Vuex and creating a store object. In the App.vue component, obtain the shared count data through the computed attribute, and call the increment method through the methods attribute to update the data. It should be noted that in each component that needs to share data, you need to import Vuex and use the corresponding state.

1.2 Using provide and inject

In addition to using Vuex, Vue also provides a simpler way to share data, using provide and inject. The following is an example of using provide and inject to achieve data sharing:

// App.vue
<template>
  <div>
    <h1 id="count">{{ count }}</h1>
    <button @click="increment">Increment</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      count: 0
    }
  },
  provide() {
    return {
      count: this.count,
      increment: this.increment
    }
  },
  methods: {
    increment() {
      this.count++
    }
  }
}
</script>

// Child.vue
<template>
  <div>
    <h2 id="count">{{ count }}</h2>
    <button @click="increment">Increment in Child</button>
  </div>
</template>

<script>
export default {
  inject: ['count', 'increment']
}
</script>

In the above example, we use provide in the parent component App.vue to share the count data and increment method. Use inject in the child component Child.vue to inject the data and methods provided by the parent component. In this way, the data of the parent component can be directly accessed and updated in the child component.

2. Transmission of data

2.1 Using props

In Vue, data can be passed from the parent component to the child component through the props attribute. The following is an example of using props to pass data:

// Parent.vue
<template>
  <div>
    <h1 id="message">{{ message }}</h1>
    <Child :message="message" />
  </div>
</template>

<script>
import Child from './Child.vue'

export default {
  data() {
    return {
      message: 'Hello Vue!'
    }
  },
  components: {
    Child
  }
}
</script>

// Child.vue
<template>
  <div>
    <h2 id="message">{{ message }}</h2>
  </div>
</template>

<script>
export default {
  props: ['message']
}
</script>

In the above example, we pass the message data in the parent component Parent.vue to the child component Child.vue through the props attribute, and in the child component through the props attribute to receive data passed by the parent component.

3. Summary

Through the above sample code, we have learned how to share and transfer data in Vue components. You can choose a suitable solution based on specific business needs to realize data sharing and transfer, and improve the development efficiency and maintainability of Web applications.

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