Implementar ação condicional no estado no React-redux

Ao trabalhar com aplicativos React de nível empresarial, você precisa lidar com o gerenciamento de estado complexo. A complexidade do estado aumenta à medida que o aplicativo é dimensionado. Você pode evitar problemas relacionados ao estado nesses aplicativos usando uma biblioteca de gerenciamento de estado. Uma biblioteca de gerenciamento de estado faz todo o trabalho pesado para você e fornece uma API declarativa para gerenciar o estado em todo o aplicativo.

Redux é uma biblioteca de gerenciamento de estado popular para React. O Redux ajuda você a gerenciar o estado com comportamento previsível, o que ajuda na manutenção do código a longo prazo. Neste guia, você aprenderá como usar o Redux para despachar ações condicionalmente com base no valor no armazenamento global atual.

Entendendo as ações

As ações são objetos simples que enviam dados ou cargas úteis de informações de seu componente para o objeto de armazenamento global. Abaixo está um exemplo de objeto de ação que representa uma ação para autenticar um usuário.

const AUTHENTICATE = `LOGIN_USER`;

{
    type: AUTHENTICATE,
    payload: {
        email: 'john@doe.com',
        password: 'john123'
    }
}

A typechave é a única propriedade obrigatória para ação; outras propriedades dependem de você e podem ser flexíveis para atender aos requisitos do seu aplicativo. É uma boa prática enviar o mínimo de dados possível em cada ação e evitar objetos aninhados.

Ação de despacho do componente

Agora que você entende as ações do Redux, nesta seção, você aprenderá como despachar uma ação de um componente.

Como exemplo, considere um LoginFormcomponente que trata da validação e envio do formulário; uma vez que o formulário é submetido com sucesso, ele passa os valores para o componente pai, ou seja, o LoginPagecomponente usando a onSubmitprop. Quando o formulário for enviado, você precisará despachar a AUTHENTICATEação, que cuidará do processo de autenticação.

import React from "react";

class LoginPage extends React.Component {
  constructor(props) {
    super(props);

    this.handleFormSubmit = this.handleFormSubmit.bind(this);
  }

  handleFormSubmit(values) {
    // dispatch AUTHENTICATE action
  }

  render() {
    return (
      <div>
        <LoginForm onSubmit={this.handleFormSubmit} />
      </div>
    );
  }
}

export default LoginPage;

Agora, para despachar a ação do LoginPagecomponente, você precisa usar o connectmétodo da react-reduxbiblioteca.

import React from "react";
import { connect } from "react-redux";

class LoginPage extends React.Component {
  constructor(props) {
    // ...
  }

  handleFormSubmit(values) {
    // dispatch AUTHENTICATE action
    this.props.dispatch({
      type: AUTHENTICATE,
      payload: values,
    });
  }

  render() {
    // ...
  }
}

export default connect()(LoginPage);

O connectmétodo é uma função de aprimoramento que conecta o componente com o armazenamento global e também injeta um método de despacho no prop.

O dispatchmétodo pega o objeto de ação como seu parâmetro e despacha essa ação para o armazenamento do Redux.

Despachando ação condicionalmente do componente

Considere que a autenticação já está em andamento, nesse caso você não deseja despachar a AUTHENTICATEação. Então aqui, você precisa conectar o componente ao armazenamento global e recuperar o status de autenticação. Você pode fazer isso passando o mapStateToPropsargumento para o connect()método.

const mapStateToProps = (globalState) => {
  const { isAuthenticating } = globalState;
  return { isAuthenticating };
};

export default connect(mapStateToProps)(LoginPage);

Então, no handleFormSubmitmétodo, você pode fazer o seguinte.

handleFormSubmit(values) {
    if (!this.props.isAuthenticating)
      this.props.dispatch({
        type: AUTHENTICATE,
        payload: values,
      });
}

A condição acima garantirá que a AUTHENTICATEação seja despachada somente quando o isAuthenticationestado for definido como falso.

Aqui está o código completo para sua referência.

import React from "react";
import { connect } from "react-redux";

class LoginPage extends React.Component {
  constructor(props) {
    super(props);

    this.handleFormSubmit = this.handleFormSubmit.bind(this);
  }

  handleFormSubmit(values) {
    if (!this.props.isAuthenticating)
      this.props.dispatch({
        type: AUTHENTICATE,
        payload: values,
      });
  }

  render() {
    return (
      <div>
        <LoginForm onSubmit={this.handleFormSubmit} />
      </div>
    );
  }
}

const mapStateToProps = (globalState) => {
  const { isAuthenticating } = globalState;
  return { isAuthenticating };
};

export default connect(mapStateToProps)(LoginPage);

O Redux facilita a previsão do estado do aplicativo e do fluxo de dados. Redux dev-tools fornece depuração de "viagem no tempo" que permite despachar quaisquer ações anteriores.

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How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

• Performance: It delivers optimal performance.
• Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
• UI design: React Native enables you to design simple and responsive UI for your mobile app.
• 3rd party plugins: This framework supports 3rd party plugins.
• Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

• Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
• Near-native user experience: React Native provides several native components, and these are platform agnostic.
• The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

Reduce Redux Boilerplate Code with Redux-Actions

Redux has become one of the most popular libraries in front-end development since it was introduced by Dan Abramov and Andrew Clark in 2015. They designed it as the successor for Flux, with the support of some developer tools and a few more concepts embedded in it.

Flux is a fancy name for observer pattern further modified to support React. Both Flux and Redux consist of similar concepts like Store, Actions (events in the application). In other words, Flux is a simple JavaScript object but with some middleware like redux-thunk. It can be a function or a promise for Redux. However, Redux is a single source of truth with concepts like immutability, which improve performance. It is one of the main reasons for Redux to dominate in State Management.

Flux vs Redux comparison source: enappd.com

Despite its advantages, some developers have found it rather challenging to deal with Redux due to the amount of boilerplate code introduced with it. And the complexity of the code seems to be another reason for the difficulty.

In this article, we will look at how to reduce the boilerplate code brought about by Actions and Reducers using Redux-Actions

#react-redux-boilerplate #react-redux #react #react-actions #redux

Himalayausa Clone using React JS and Redux

Inspired from Himalayausa.com

Project-code: closed-birthday-4512

Tech Stack Used

#React.js

#Redux

#Chakra-UI

#React Slick

#JavaScript

#HTML

#CSS

#Heroku

#Versel

#NPM

Deploy link:- Versal

This website was originally inspired from Himalayausa.com Our Team made Tremendus efforts and build this website within 5 consicutive days. We used React.js library for the UI part and used REDUX store for maintaing the states of the components. We used Heroku server API for getting the Mock Data and used Versel to deploy.

sneak peeks of the project...

Landing page...

Shop By Category ...

Best Seller ...

Navbar ...

Footer ...

About Page ...

Login page ...

Signup page ...

product page ...

Single Product ...

Cart page ...

Checkout page ...

Main Contributors

#Anurag Dinkar Pawar GitHub

#Veena Sahu GitHub

#Narayan Chatalwar GitHub

#SHILAJIT PAUL GitHub

#Govind Lakhotiya GitHub

---

Author: AnuragPawar-132
Source code: https://github.com/AnuragPawar-132/closed-birthday-4512

#react #javascript #Redux 

Accessing Redux from Components In React & React Native

How to set up a basic version of Redux in your React or React Native application. To make things clearer, I based my setup on my event application, where users create events that other users attend. We generated the action creators, reducers, and Redux store, and wrapped the application in a provider. Today I’ll finish the loop and talk about how to access the Redux store in your application using both class and functional components. The provider we added to the root component provides the store to all the components in your application. Therefore, we will just look at how to access the store from an individual component.

#react-redux #redux #hooks #react #react-native

A Basic Redux Setup in React/React Native

Redux is a powerful state management tool that can be very useful as your React or React Native application grows and requires you to keep track of more state. How you want to set up Redux is up to you, but if you’re a beginner, it may be easiest to learn the flow of Redux with a step-by-step walkthrough. Here I’ve outlined a basic way to set up Redux to go along with this post and it will be the same for React and React Native.

#react #react-native #redux #react-redux