Vue コンポーネント通信における状態管理ソリューションの比較

<template>
  <ChildComponent :message="message" @notify="handleNotify"></ChildComponent>
</template>

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

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      message: 'Hello Vue!'
    }
  },
  methods: {
    handleNotify(newValue) {
      console.log(newValue)
    }
  }
}
</script>

<template>
  <div>
    <p>{{ message }}</p>
    <button @click="handleClick">Notify</button>
  </div>
</template>

<script>
export default {
  props: {
    message: String
  },
  methods: {
    handleClick() {
      this.$emit('notify', 'Message from ChildComponent')
    }
  }
}
</script>

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

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    message: 'Hello Vuex!'
  },
  mutations: {
    setMessage(state, payload) {
      state.message = payload
    }
  },
  actions: {
    updateMessage({ commit }, payload) {
      commit('setMessage', payload)
    }
  },
})

// parent.vue
<template>
  <div>
    <p>{{ $store.state.message }}</p>
    <button @click="updateMessage">Update Message</button>
  </div>
</template>

<script>
import { mapActions } from 'vuex'

export default {
  methods: {
    ...mapActions(['updateMessage']),    
  }
}
</script>

// child.vue
<template>
  <div>
    <p>{{ $store.state.message }}</p>
    <button @click="updateMessage">Update Message</button>
  </div>
</template>

<script>
import { mapActions } from 'vuex'

export default {
  methods: {
    ...mapActions(['updateMessage']),    
  }
}
</script>

// provider.vue
<template>
  <div>
    <provide :message="message">
      <child></child>
    </provide>
  </div>
</template>
  
<script>
export default {
  data() {
    return {
      message: 'Hello Provide and Inject!'
    }
  }
}
</script>

// child.vue
<template>
  <div>
    <p>{{ message }}</p>
  </div>
</template>
  
<script>
export default {
  inject: ['message']
}
</script>