Tips for implementing pinia store getters with v-model on an input field?

Question

Tips for implementing pinia store getters with v-model on an input field?

In my project, I am currently focused on saving user form responses. I have set up a pinia store and defined each form as an object within it. By integrating this store into my component and assigning the getter function of that store to a variable,

I am using this variable as a v-model. However, even after providing input, nothing is being returned. Strangely, there are no error messages either. Could it be possible that I have taken the wrong approach?

Userstore.js

    import { defineStore } from 'pinia';
    
    export const userResponses = {
      formsResponses: {
        form1: {
          input1: '',
        },
      },
    };
    
    export default defineStore('userStore', {
      state() { return userResponses; },
    
      getters: {
        getFormsInput: (state) => state.formsResponses.form1,
      },
      actions: {
        setFormsResponses(formResponses) {
          this.formsResponses.form1 = formResponses;
        },
      },
    });

Form1.vue

  <template>
    <input type="text" name="input_form" v-model="input"/>
    <button type="Primary" @click="submit">submit</button>
  </template>
    
    <script setup>
    import { computed, ref } from 'vue';
    import useUserStore from '@/store/userStore';
    
    
    const userStore = useUserStore();
    
    const input = ref('');
    const responses = computed(() => userStore.getFormsInput);
    
    reponses.value.input1 = input.value;
    
    function submit() {
      console.log(reponses.value.input1); // it is giving nothing
    }
    
    </script>

Why am I struggling to utilize getters or update the value? Would it work if I directly used getters in the v-model?

javascript vue.js vuejs3 pinia

Answer 1

Answer №1

There are multiple ways to bind a store's state to a form input, such as using writable computed directly on the store's state, storeToRefs, toRefs, or a writable computed with store getter and action.

An efficient way to do this is:

const { someState } = toRefs(useStore())

You can now utilize someState with v-model, which updates the store state instantly.
In order to rename the store state members and prevent name conflicts:

const { 
  foo: localFoo,
  bamboo: localBamboo
} = toRefs(useStore())
// console.log(localBamboo.value)

All of these methods create reactive refs. When used in the script, you need to append .value, unlike in the <template> where Vue automatically unwraps them.

If you require full control over the read and write operations (for validation or data transformation), consider using a Writable Computed (computed getter/setter):

const store = useStore()
const myInput = computed({
  get() {
    return store.someState
  },
  set(val) {
    store.someState = val
  }
})

While not essential here, this approach proves valuable for complex forms, especially when intricate control and custom validation are needed.

The mentioned method closely resembles how store state writing is performed using the Options API:

  computed: {
    myInput: {
      get() { 
        return useStore().someState
      },
      set(val) { 
        useStore().someState = val
      }
    }
  }

Notably, the 'pinia' library offers an alternative to 'toRefs' called 'storeToRefs', providing all store state and getters as reactive refs. Even though it may just be a re-export of 'toRefs', I personally prefer 'storeToRefs' from 'pinia'. Check out the following example:

<script setup>
import { useUserStore } from "../store";
import { storeToRefs } from "pinia";

const { form1 } = storeToRefs(useUserStore());
</script>
<template>
  <input v-model="form1.input1" />
</template>

View it in action. The input writes directly to the store's state.

To link a store getter to a v-model, a setter must be present (as illustrated above).

Note: Simplify your store's structure unless there is a valid reason to complicate it unnecessarily.

If you require a local form state (and want the user to decide when to save/reset):

Check out this example of a local form state.
Once again, eliminated unnecessary code.
Notice the destructuring at the points where the store's state interacts with the local state. Initially, you might think the submit assignment would look like:

form1.value = localForm

However, after doing so, the reactivity of localForm becomes linked to the store state, causing every user input to be saved in the store without needing to call submit().

Related links:

Setting up Pinia getter in Vue 3 Composition API
Pinia writable getter ¹

¹ - Refer to Setup stores syntax for utilizing "writable getters".

Answer 2

There are multiple ways to bind a store's state to a form input, such as using writable computed directly on the store's state, storeToRefs, toRefs, or a writable computed with store getter and action.

An efficient way to do this is:

const { someState } = toRefs(useStore())

You can now utilize someState with v-model, which updates the store state instantly.
In order to rename the store state members and prevent name conflicts:

const { 
  foo: localFoo,
  bamboo: localBamboo
} = toRefs(useStore())
// console.log(localBamboo.value)

All of these methods create reactive refs. When used in the script, you need to append .value, unlike in the <template> where Vue automatically unwraps them.

If you require full control over the read and write operations (for validation or data transformation), consider using a Writable Computed (computed getter/setter):

const store = useStore()
const myInput = computed({
  get() {
    return store.someState
  },
  set(val) {
    store.someState = val
  }
})

While not essential here, this approach proves valuable for complex forms, especially when intricate control and custom validation are needed.

The mentioned method closely resembles how store state writing is performed using the Options API:

  computed: {
    myInput: {
      get() { 
        return useStore().someState
      },
      set(val) { 
        useStore().someState = val
      }
    }
  }

Notably, the 'pinia' library offers an alternative to 'toRefs' called 'storeToRefs', providing all store state and getters as reactive refs. Even though it may just be a re-export of 'toRefs', I personally prefer 'storeToRefs' from 'pinia'. Check out the following example:

<script setup>
import { useUserStore } from "../store";
import { storeToRefs } from "pinia";

const { form1 } = storeToRefs(useUserStore());
</script>
<template>
  <input v-model="form1.input1" />
</template>

View it in action. The input writes directly to the store's state.

To link a store getter to a v-model, a setter must be present (as illustrated above).

Note: Simplify your store's structure unless there is a valid reason to complicate it unnecessarily.

If you require a local form state (and want the user to decide when to save/reset):

Check out this example of a local form state.
Once again, eliminated unnecessary code.
Notice the destructuring at the points where the store's state interacts with the local state. Initially, you might think the submit assignment would look like:

form1.value = localForm

However, after doing so, the reactivity of localForm becomes linked to the store state, causing every user input to be saved in the store without needing to call submit().

Answer №2

In case you're searching for the Vue 3 Options API version that hasn't been shared yet, here it is:

import { defineStore } from 'pinia';

export const kittenStore = defineStore('kitten', {
  state: function () {
    return {
      kittenName: ''
    };
  },
  actions: {
    setKittenName: function (name) {
      this.kittenName = name;
    }
  }
});

<template>
  <input v-model="kittenName">
</template>

<script>
import { kittenStore } from '@/stores/kitten.js';

export default {
  name: 'ExampleComponent',
  computed: {
    kittenName: {
      get: function () {
        return kittenStore().kittenName;
      },
      set: function (value) {
        kittenStore().setKittenName(value);
      }
    }
  }
};
</script>

This method ensures uniformity in all files. It upholds structured code at the framework level.

Answer 4

In case you're searching for the Vue 3 Options API version that hasn't been shared yet, here it is:

import { defineStore } from 'pinia';

export const kittenStore = defineStore('kitten', {
  state: function () {
    return {
      kittenName: ''
    };
  },
  actions: {
    setKittenName: function (name) {
      this.kittenName = name;
    }
  }
});

<template>
  <input v-model="kittenName">
</template>

<script>
import { kittenStore } from '@/stores/kitten.js';

export default {
  name: 'ExampleComponent',
  computed: {
    kittenName: {
      get: function () {
        return kittenStore().kittenName;
      },
      set: function (value) {
        kittenStore().setKittenName(value);
      }
    }
  }
};
</script>

This method ensures uniformity in all files. It upholds structured code at the framework level.

Answer 5

Answer №3

It appears there may be a typo in this section.

let data = reactive({
    user: 'John Doe',
    age: 30,
    city: 'New York'
});
      
data.age = 31; //typo: data
      
function displayData() {
    console.log(data.user); // typo: data
}

Answer 6

It appears there may be a typo in this section.

let data = reactive({
    user: 'John Doe',
    age: 30,
    city: 'New York'
});
      
data.age = 31; //typo: data
      
function displayData() {
    console.log(data.user); // typo: data
}

Answer 7

Answer №4

In the realm of Pinia, a Getter is considered a computed value derived from a state. It's advisable to steer clear of using a computed value as a v-model, particularly in scenarios where there are no getter and setter options available for getters within Pinia at present..

If getFormsInput serves the sole purpose of retrieving a specific property from a JSON object, it would be more efficient to directly modify the state by accessing formsResponses.form1.input1.

<template>
  <input type="text" name="input_form" v-model="userStore.formsResponses.form1.input1"/>
  <button type="Primary" @click="submit">submit</button>
</template>

<script setup>
import { computed, ref } from 'vue';
import useUserStore from '@/store/userStore';

const userStore = useUserStore();

function submit() {
  console.log(userStore.formsResponses.form1.input1); //they should be the same
  console.log(userStore.getFormsInput); //they should be the same
}

</script>

On a side note, I personally believe that referencing the value of a JSON property does not necessitate the use of .value.

Answer 8

In the realm of Pinia, a Getter is considered a computed value derived from a state. It's advisable to steer clear of using a computed value as a v-model, particularly in scenarios where there are no getter and setter options available for getters within Pinia at present..

If getFormsInput serves the sole purpose of retrieving a specific property from a JSON object, it would be more efficient to directly modify the state by accessing formsResponses.form1.input1.

<template>
  <input type="text" name="input_form" v-model="userStore.formsResponses.form1.input1"/>
  <button type="Primary" @click="submit">submit</button>
</template>

<script setup>
import { computed, ref } from 'vue';
import useUserStore from '@/store/userStore';

const userStore = useUserStore();

function submit() {
  console.log(userStore.formsResponses.form1.input1); //they should be the same
  console.log(userStore.getFormsInput); //they should be the same
}

</script>

On a side note, I personally believe that referencing the value of a JSON property does not necessitate the use of .value.

Tips for implementing pinia store getters with v-model on an input field?

Answer №1

Answer №2

Answer №3

Answer №4

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