Do You Really Need Vuex?

The core flux library in Vue.js is Vuex, but do you really need it? We take a look at this question and answer it here.

Vue is already established as a major JavaScript framework. This is due to a multitude of reasons, ranging from its smooth developer experience to its extensive ecosystem. Vue’s core ecosystem and tooling is particularly admirable and is also what makes it eligible to be called a full-fledged framework.

Vue was built to be versatile, however, this versatility is very often misinterpreted by newcomers and certain seasoned developers, which tend to include a lot of tools because they think they may “need them later”. In reality, those tools are not always needed. Therefore, it is very important to understand how a tool can benefit us before adding it, or else it may turn into a disadvantage rather than something helpful.

We will now take a look at the core flux library in Vue.js: Vuex.

Vuex is the state management system in Vue.js. It is a centralized store that follows strict rules in order to help manage the state of all the components present in your Vue application.

Sounds extremely important. right? In reality, it’s a powerful tool that may or may not be helpful depending on the use case.

#vuex #vue #vuejs #javascript #web-development

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Do You Really Need Vuex?

The core flux library in Vue.js is Vuex, but do you really need it? We take a look at this question and answer it here.

Vue is already established as a major JavaScript framework. This is due to a multitude of reasons, ranging from its smooth developer experience to its extensive ecosystem. Vue’s core ecosystem and tooling is particularly admirable and is also what makes it eligible to be called a full-fledged framework.

Vue was built to be versatile, however, this versatility is very often misinterpreted by newcomers and certain seasoned developers, which tend to include a lot of tools because they think they may “need them later”. In reality, those tools are not always needed. Therefore, it is very important to understand how a tool can benefit us before adding it, or else it may turn into a disadvantage rather than something helpful.

We will now take a look at the core flux library in Vue.js: Vuex.

Vuex is the state management system in Vue.js. It is a centralized store that follows strict rules in order to help manage the state of all the components present in your Vue application.

Sounds extremely important. right? In reality, it’s a powerful tool that may or may not be helpful depending on the use case.

#vuex #vue #vuejs #javascript #web-development

Simple Vuex Module to Handle Form Fields and Validations.

Simple Vuex module to handle form fields and validations.

You can build a view model for your form, which runs valdations easily. You just provide initial fields and validators to build the module, then map getters/actions to components.

Usage

Installation

$ npm i vuex-module-validatable-state

Register to core Vuex module

This module provides the function to return Vuex module as default. The function takes arguments:

• Initial field set
• Validators

A. Define directly

import validatableModule from "vuex-module-validatable-state";

const initialFields = {
  amount: null,
  description: "default text"
};

const validators = {
  amount: [
    ({ amount }) => amount === null ? "Require this" : false
  ],
  description: [
    ({ description }) => description.length > 15 ? "Should be shorter than 15" : false,
    ({ description, amount }) => description.indexOf(amount.toString())  ? "Should include amount" : false,
  ]
};

new Vuex.Store({
  modules: {
    myForm: {
      namespaced: true
      store,
      getters,
      actions,
      mutations,
      modules: {
        ...validatableModule(initialFields, validators) // <-- HERE
      }
    }
  }
});

B. Register to existing module

import { register } from "vuex-module-validatable-state";

const initialFields = {
  amount: null,
  description: "default text"
};

const validators = {
  amount: [
    ({ amount }) => amount === null ? "Require this" : false
  ],
  description: [
    ({ description }) => description.length > 15 ? "Should be shorter than 15" : false,
    ({ description, amount }) => description.indexOf(amount.toString())  ? "Should include amount" : false,
  ]
};

const store = new Vuex.Store({
  modules: {
    myForm: {
      namespaced: true
      store,
      getters,
      actions,
      mutations
    }
  }
});

register(store, "myForm", initialFields, validators);

Map to Components

Provided Getters

Getter name	Returns
GetterTypes.ALL_FIELDS_VALID	boolean whether all fields don’t have error
GetterTypes.FIELD_VALUES	All fields as { [fieldName]: value }
GetterTypes.FIELD_ERRORS	All errors as { [fieldName]: errorMessage }
GetterTypes.FIELD_EDITABILITIES	All editable flags as { [fieldName]: editability }
GetterTypes.FIELD_DIRTINESSES	All dirtiness flags as { [fieldName]: dirtiness }
GetterTypes.ANY_FIELD_CHANGED	boolean whether all fields are not dirty

Provided Actions

Import ActionTypes from the module.

Action name	Runs
ActionTypes.SET_FIELD	Set value for a field, then runs validation if enabled
ActionTypes.SET_FIELDS_BULK	Set values for fields at once, then make all dirtiness flags false
ActionTypes.RESET_FIELDS	Reset values on field with initial values
ActionTypes.ENABLE_ALL_VALIDATIONS	Enable interactive validation and run validations for all fields
ActionTypes.VALIDATE_FIELD_VALUE	Validate specific field
ActionTypes.VALIDATE_FIELDS	Validate all fields
ActionTypes.SET_FIELDS_EDITABILITY	Set editability flag for a field, disabled field is not updated nor validated
ActionTypes.SET_FIELDS_PRISTINE	Make all dirtiness flags false

Validators

You can pass validators when you initialize the module.

const validators = {
  amount: [/* validators for filling error against to amount */],
  description: [/* validators for filling error against to description */]
}

Each validator can take all fields values to run validation:

const validators = {
  amount: [
    ({ amount, description }) => /* return false or errorMessage */
  ]
}

Optionally, can take getters on the store which calls this module:

const validators = {
  description: [
    ({ description }, getters) => getters.getterOnStore && validationLogicIfGetterOnStoreIsTruthy(description)
  ]
}

And you can request “interactive validation” which valites every time dispatch(ActionTypes.SET_FIELD) is called

const validators = {
  amount: [
    [({ amount }, getters) => /* validator logic */, { instant: true }]
  ]
}

Provided Typings

You can import handy type/interface definitions from the module. The generic T in below expects fields type like:

interface FieldValues {
  amount: number;
  description: string;
}

getters[GetterTypes.FIELD_VALUES] returns values with following FieldValues interface.

See all typings

ValidatorTree<T>

As like ActionTree, MutationTree, you can receive type guards for Validators. By giving your fields’ type for Generics, validator can get more guards for each fields:

SetFieldAction<T>

It’s the type definition of the payload for dispatching ActionTypes.SET_FIELD, you can get type guard for your fields by giving Generics.

FieldValidationErrors<T>

Type for getters[GetterTypes.FIELD_ERRORS]

FieldEditabilities<T>

Type for getters[GetterTypes.FIELD_EDITABILITIES]

FieldDirtinesses<T>

Type for getters[GetterTypes.FIELD_DIRTINESSES]

Working Sample

Registering to Vuex Store

const initialField = {
  amount: 0,
  description: null
};

const validators = {
  amount: [
    ({ amount }) => (!amount ? "Amount is required" : false),
    ({ amount }) => (amount <= 0 ? "Amount should be greater than 0" : false)
  ],
  description: [
    ({ amount, description }) =>
      amount > 1000 && !description
        ? "Description is required if amount is high"
        : false
  ]
};

const store = new Vuex.Store({
  modules: {
    ...theModule(initialField, validators)
  }
});

Mapping to Component

<template>
  <form>
    <div>
      <label for="amount">Amount (Required, Positive)</label>
      <input type="number" name="amount" v-model="amount">
      <span v-if="errors.amount">{{ errors.amount }}</span>
    </div>
    <div>
      <label for="description">Description (Required if amount is greater than 1000)</label>
      <textarea name="description" v-model="description"/>
      <span v-if="errors.description">{{ errors.description }}</span>
    </div>
    <button @click.prevent="submit">Validate and Submit</button>
  </form>
</template>

<script>
import { GetterTypes, ActionTypes } from "vuex-module-validatable-state";

export default {
  name: "App",
  computed: {
    amount: {
      get() {
        return this.$store.getters[GetterTypes.FIELD_VALUES].amount;
      },
      set(value) {
        this.$store.dispatch(ActionTypes.SET_FIELD_VALUE, {
          name: "amount",
          value
        });
      }
    },
    description: {
      get() {
        return this.$store.getters[GetterTypes.FIELD_VALUES].description;
      },
      set(value) {
        this.$store.dispatch(ActionTypes.SET_FIELD_VALUE, {
          name: "description",
          value
        });
      }
    },
    errors() {
      return this.$store.getters[GetterTypes.FIELD_ERRORS];
    }
  },
  methods: {
    submit() {
      this.$store.dispatch(ActionTypes.ENABLE_ALL_VALIDATIONS).then(() => {
        if (this.$store.getters[GetterTypes.ALL_FIELDS_VALID]) {
          alert("Form is valid, so now submitting!");
          this.$store.dispatch(ActionTypes.SET_FIELDS_PRISTINE);
        }
      });
    }
  }
};
</script>

Demo || Download

---

Thank for read!

#vuex #vuex-module #vue-form #vue-form-validate

Vuex Tutorial Example From Scratch

Vuex Tutorial Example From Scratch is today’s main topic. VueJS is the front end library to design the interfaces, and it is gaining immense popularity nowadays. Vuex is one of the Vue js’s model implementation, or we can say State of our data representation. So let us talk about Vuex with an example in deep. We are using Vuex 2.0 so, technically it is a Vuex 2.0 tutorial example.

Vuex 2.0 and VueJS 2.0 Tutorial will go through the practice of how you can set up the dev environment with each other, and we are creating Simple Counter Tutorial.

Purpose

One possible reason I am writing this is showcase how Vuex will play nicely together.

Requirements

For learning Vue.js, I suggest going with my this article Vuejs Tutorial With Example. It will guide you to learn fundamentals of Vue.js 2.0

#vuex #vue.js #vuex 2.0

Why You Might Not Need Vuex With Vue 3

Vuex is an awesome state management library. It’s simple and integrates well with Vue. Why would anyone leave Vuex? The reason could be that the upcoming Vue 3 release exposes the underlying reactivity system and introduces new ways of structuring your application. The new reactivity system is so powerful that it can be used for centralized state management.

---

Do You Need a Shared State?

There are circumstances when data flow between multiple components becomes so hard that you need centralized state management. These circumstances include:

• Multiple components using the same data.
• Multiple roots with data access.
• Deep nesting of components.

If none of the cases above are true, it’s easy to determine whether you need it or not. You don’t.

But what about if you have one of these cases? The straightforward answer would be to use Vuex. It’s a battle-tested solution and does a decent job.

But what if you don’t want to add another dependency or find the setup overly complicated? Together with the Composition API, the new Vue 3 version can solve these problems with its built-in methods.

---

The New Solution

A shared state must fit two criteria:

• Reactivity: When the state changes, the components using them should also update.
• Availability: The state can be accessed in any of the components.

---

Reactivity

Vue 3 exposes its reactivity system through numerous functions. You can create a reactive variable with the reactive function (an alternative would be the ref function):

	import { reactive } from 'vue';

	export const state = reactive({ counter: 0 });

#vue #vuejs #programming #javascript #vue 3 #vuex

You might not need Vuex - Vue.js Amsterdam 2020

Natalia Tepluhina - You might not need Vuex

#vuex #vue #vue.js #programming