Differences between using a getter in Vue.js/Vuex compared to directly accessing state values on the create lifecycle hook

Question

Differences between using a getter in Vue.js/Vuex compared to directly accessing state values on the create lifecycle hook

As I utilize the created lifecycle hook within vue.js to fetch data from my store and pass it to a vue component's data, an interesting observation arises. When I employ

this.selectedType = store.state.selectedType

, the data is successfully retrieved from the store. However, when attempting to retrieve the same data using a getter (i.e.

this.selectedType = store.getters.getType()

), an error is encountered:

Error in created hook: "TypeError: Cannot read property 'selectedType' of undefined"

The confusion sets in as selectedType should not be considered undefined since it holds the value "Item" within the store and can be correctly accessed during creation utilizing

this.selectedType = store.state.selectedType

.

A snippet of the getter function looks like this:

getters: {
    getSelectedType: state => {
      return state.selectedType
    }
}

Moving on to how the state is set up:

state: {
  selectedType: "Item"
}

If anyone could shed light on why this discrepancy exists, I suspect there may be a gap in my understanding of lifecycles contributing to this unexpected behavior.

javascript vue.js vuex

Answer 1

Answer №1

When working with Vuex in your Vue application, it's important to remember not to call getters directly. Instead, treat them like you would a variable and let the function defined in the Vuex store handle the logic.

Additionally, avoid using lifecycle hooks to initialize variables. Instead, initialize local component variables in the data property and use computed properties for accessing Vuex state.

To access the store in any component, simply use this.$store. Utilize the mapGetters helper to easily map getters to component properties:

import { mapGetters } from 'vuex';

export default {
  // Omitted some things here

  computed: {
    ...mapGetters({
      selectedType: 'getSelectedType'
    })
  },

  methods: {
    doSomething () {
      console.log(this.selectedType);
    }
  }
}

This setup is essentially the same as manually defining the getter in the computed property:

computed: {
  selectedType () {
    return this.$store.getters.getSelectedType;
  }
}

Answer 2

When working with Vuex in your Vue application, it's important to remember not to call getters directly. Instead, treat them like you would a variable and let the function defined in the Vuex store handle the logic.

Additionally, avoid using lifecycle hooks to initialize variables. Instead, initialize local component variables in the data property and use computed properties for accessing Vuex state.

To access the store in any component, simply use this.$store. Utilize the mapGetters helper to easily map getters to component properties:

import { mapGetters } from 'vuex';

export default {
  // Omitted some things here

  computed: {
    ...mapGetters({
      selectedType: 'getSelectedType'
    })
  },

  methods: {
    doSomething () {
      console.log(this.selectedType);
    }
  }
}

This setup is essentially the same as manually defining the getter in the computed property:

computed: {
  selectedType () {
    return this.$store.getters.getSelectedType;
  }
}

Differences between using a getter in Vue.js/Vuex compared to directly accessing state values on the create lifecycle hook

Answer №1

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