Introduction to Vuex

Vuex is the official state management library of vuex, It is used for state management as the description implies. It serves as a centralized store for the components in an application, with rules ensuring that the state can only be mutated predictably.

Starting up as a vuejs developer, vuex gave me a tough time, was confusing, and took sometime before I could master it.

In the course of this tutorial, We would be building a book library using vue and firebase. So brace yourself

App Overview

The aim of this application is for registered users to borrow books and for the bookkeeper to keep track of the books that were borrowed. The major features we would be implementing would be:

1. Authentication
2. Real-time database

From a technical point of vue…(wordplay 😆)

1. Vue — a modern javascript framework
2. Firebase — Authentication and real-time database
3. Vuex- For state management
4. Vue-Router — For routing

Note: This tutorial covers the full set up for this project. If you want to go straight into vuex and the core functionality implementation, visit part 2 of this tutorial

#vuejs #vuex #javascript

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Introduction to Vuex

Vuex is the official state management library of vuex, It is used for state management as the description implies. It serves as a centralized store for the components in an application, with rules ensuring that the state can only be mutated predictably.

Starting up as a vuejs developer, vuex gave me a tough time, was confusing, and took sometime before I could master it.

In the course of this tutorial, We would be building a book library using vue and firebase. So brace yourself

App Overview

The aim of this application is for registered users to borrow books and for the bookkeeper to keep track of the books that were borrowed. The major features we would be implementing would be:

1. Authentication
2. Real-time database

From a technical point of vue…(wordplay 😆)

1. Vue — a modern javascript framework
2. Firebase — Authentication and real-time database
3. Vuex- For state management
4. Vue-Router — For routing

Note: This tutorial covers the full set up for this project. If you want to go straight into vuex and the core functionality implementation, visit part 2 of this tutorial

#vuejs #vuex #javascript

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

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