Utilizing vuexjs's getter function with parameters

Can parameters be passed into a getter of the Vuex store? something like:

new Vuex.Store({
  getters: {
    someMethod(arg){
       // return data from store with query on args
    }
  }
})

This would allow using in a component like this

<template>
    <div>
        <p>{{someMethod(this.id)}}</p>
    </div>
</template>
<script lang="ts>
    import { mapGetters } from "vuex"

    export default {
        props: ['id'],
        computed: mapGetters(['someMethod'])
        }
    }
</script>

However, in vuex the first argument is state and the second is other getters. Is it possible?

Answer №1

You can also use an ES6 arrow function in this scenario. Imagine you are searching for a specific item in your store.

new Vuex.Store({
  getters: {
    findItem: (state) => (id) => {
      return state.items.find(item => item.id === id)
    }
  },
})

For more examples, check out the Vuex documentation

Answer №2

Here is a possible solution:

new Vuex.Store({
  getters: {
    someMethod(state){
      var self = this;
       return function (args) {
          // retrieve data from store based on args and using self as reference
       };       
    }
  }
})

It's worth noting that getters do not accept arguments, as discussed in this thread:

The naming convention of getters can be misleading; they actually act like reducers.

We could consider having pure reducer methods for tasks like filtering and mapping.

Getters could then be used with any context, similar to computed properties, allowing for a more organized component structure.

Edit:

A more efficient approach would involve utilizing ES6 arrow functions as explained by nivram80, implementing method style access for getters to pass parameters through a returned function:

new Vuex.Store({
  getters: {
    someMethod: (state) => (id) => {
        return state.things.find(thing => thing.id === id)
      }
    };       
  }
})

Answer №3

If you need to pass arguments to getters, you can achieve this by utilizing a function as the return value. This approach is especially handy when dealing with querying an array in the store:

getters: {
  // ...
  getTodoById: (state) => (id) => {
    return state.todos.find(todo => todo.id === id)
  }
}

When using this getter inside your Vue component:

store.getters.getTodoById(2) // -> { id: 2, text: '...', done: false }

Keep in mind that getters accessed through methods will execute each time they are called, and the output is not stored in cache.

The content above has been extracted from the official Vue documentation: https://vuex.vuejs.org/guide/getters.html#method-style-access

Answer №4

To utilize the MapGetters helper, you need to first define store getters in Vue.js:

new Vuex.Store({
  getters: {
    myGetterMethod(state){
       return (value) => {
          return value;
       }
    }
  }
})

After defining the getter method, you can call it from a component as shown below:

<script>
import { mapGetters } from "vuex"

export default {
 computed: {
 ...mapGetters(['myGetterMethod'])
 },
 mounted() {
   console.log(this.myGetterMethod('example data')); // this will output "example data"
 }       
}
</script>

Answer №5

This doesn't seem to align with the intended purpose of a vuex getter.

From the examples provided, it is clear that getters are typically used as computed properties.

<script>
    import { mapGetters } from "vuex"

    export default {
     computed: {
     ...mapGetters(['someGetter'])
     },
     mounted() {
       console.log(this.someGetter); // Keep in mind that a computed property is not a method.
     }       
}
</script>

If you require the getter to accept arguments, it might be more appropriate to use a method instead of a computed property.

Consider utilizing a store action like this:

new Vuex.Store({
  actions: {
    someMethod({ state }, arg){
       // Perform operations using state.someValue and the argument
       return transformedState;
    }
  }
})

Actions and mutations can be mapped as methods, allowing for usage like the following:

<script>
    import { mapActions } from "vuex"

    export default {
     computed: {
     
     },
     mounted() {
       // Invoke someMethod with arguments in your component 
       this.someMethod('the argument');
     },
     methods: {
     ...mapActions(['someMethod'])
     },       
}
</script>

The first parameter of an action is the store itself, providing access to the state. This applies to dispatch and commit functions as well.

Please note that an action can only receive one parameter (payload). If multiple parameters need to be passed, they must be wrapped in an object or array.

this.someMethod({ arg1, arg2, ...});

Answer №6

Struggling with how to call a getter in Vuex? Try this notation:

$this.$store.getters['store/someMethod']

To create your getter method, simply follow these steps:

new Vuex.Store({
  getters: {
    someMethod: (state) => (id) => {
      return state.things.find(thing => thing.id === id)
    }
  },
})

To use the someMethod getter, make sure to include the id parameter like so:

$this.$store.getters['store/someMethod'](thing.id)

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