#react javascript

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Use React.js with ASP.NET | Online Productivity Solutions Pvt. Ltd.

A new package is released to use React & JSX in .Net applications. Read the blog to learn the steps to create an ASP.NET MVC web application.

React is a JavaScript library used to build UI and the top feature of React is SPEED. 

A new ReactJs.Net package “React.Web.Mvc4” is released to use React and JSX in .Net applications. JSX is JavaScript XML syntax extension.

We will go through the steps to create an ASP.NET MVC web application.

https://opspl.com/blog/use-react-js-with-asp-net/

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Best Coding Practices In ReactJS

Best Coding Practices In ReactJS

Combine state In long component hierarchy use useContext Separate UI and logic Remove unnecessary props Write a function for a repetitive task Avoid named import/member import Use forEach instead of map 1. Combine State In most of the components, you’ll have a state. While defining a new state, take time and think if you can combine multiple states into a single state. Let’s understand this with…

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React Components

React is a library used to create user interfaces. React utilizes components to describe a portion of user interface. Components are independent and reusable bits of code. According to React documentation, components let you split the UI into independent, reusable pieces, and think about each piece in isolation.

There are two ways to declare React components:

 Using React createClass() method

 Using ES6 classes

Using React createClass() method

Using ES6 Classes

In the above code, a new class Library is declared, and the class extends React.Component which provides built in properties and attributes.

Types of components

React lets you define components as classes or functions.

Class components

A class component requires you to extend from React.Component (this statement creates an inheritance to React.Component and gives your component access to React.Component's functions) and create a render() function. React.Component is the base class for React components when they are defined using ES6 classes.

Class components are stateful, ie., they can manage local state (Note: React has a built-in object called state, which allows components to create and manage their own data). setState() method and life cycle methods can be used in class components. Class components can be used as container components as they can deal with state and logic.

Functional Components

A functional component is a plain JavaScript function which accepts props (which stands for “properties”: object argument with data) as arguments and returns a React element.

  A functional component does not extend React.component and hence is stateless, and setState() and life cycle methods cannot be used. A functional component returns JSX (syntax extension to JavaScript), instead of using a render() method. Functional components can be used as presentation components as they are only concerned with displaying content.

Summary

React components are small, reusable pieces of code that return a React element to be rendered to the page.

Class Components

Stateful

Life cycle methods and setState() method (https://reactjs.org/docs/react-component.html#setstate) can be used

May  contain logic

 Can be used as container components

Functional Components

Stateless

Life cycle and setState() methods cannot be used

Can be used as presentational components

 Thanks for reading.

References

https://www.w3schools.com/REACT/react_components.asp

https://reactjs.org/docs/react-api.html#reactcomponent

https://reactjs.org/docs/jsx-in-depth.html

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React tutorial for beginners breaks down important aspects such as JSX, Looping, ES, Bug Fixing, Redux, etc which helps build small projects from scratch.

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JavaScript fundamentals before learning React - RWieruch

"All the fundamentals in JavaScript for React applications. Often React newcomers realize that most of the learnings are JavaScript, because React has only a small API ...

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New Post has been published on https://semicolon.codes/facebook-react-js-repos-guide/

Facebook React JS Repository Installation Guide

React is a JavaScript library for building user interfaces.

Declarative: React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable, simpler to understand, and easier to debug.

Component-Based: Build encapsulated components that manage their own state, then compose them to make complex UIs. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep state out of the DOM.

Learn Once, Write Anywhere: We don’t make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code. React can also render on the server using Node and power mobile apps using React Native.

Hello World

The easiest way to get started with React is to use this Hello World example code on CodePen. You don’t need to install anything; you can just open it in another tab and follow along as we go through examples. If you’d rather use a local development environment, check out the Installation section.

The smallest React example looks like this:

ReactDOM.render( <h1>Hello, world!</h1>, document.getElementById('root') );

It renders a heading saying “Hello, world!” on the page.

The next few sections will gradually introduce you to using React. We will examine the building blocks of React apps: elements and components. Once you master them, you can create complex apps from small reusable pieces.

A Note on JavaScript

React is a JavaScript library, and so we’ll assume you have a basic understanding of the JavaScript language. If you don’t feel very confident, we recommend refreshing your JavaScript knowledge so you can follow along more easily.

We also use some of the ES6 syntax in the examples. We try to use it sparingly because it’s still relatively new, but we encourage you to get familiar with arrow functions, classes, template literals, let, and const statements. You can use the Babel REPL to check what ES6 code compiles to.

Documentation

You can find the React documentation on the website. It is divided into several sections:

Quick Start

Advanced Guides

API Reference

Tutorial

Where to Get Support

Contributing Guide

You can improve it by sending pull requests to this repository.

Examples

We have several examples on the website. Here is the first one to get you started:

class HelloMessage extends React.Component render() return <div>Hello this.props.name</div>; ReactDOM.render( <HelloMessage name="John" />, document.getElementById('container') );

This example will render “Hello John” into a container on the page.

You’ll notice that we used an HTML-like syntax; we call it JSX. JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML. We recommend using Babel with a React preset to convert JSX into native JavaScript for browsers to digest.

Installation

React is available as the react package on npm. It is also available on a CDN.

React is flexible and can be used in a variety of projects. You can create new apps with it, but you can also gradually introduce it into an existing codebase without doing a rewrite.

The recommended way to install React depends on your project. Here you can find short guides for the most common scenarios

Try React

Try React online or set up your local development environment.

Online

If you’re just interested in playing around with React, you can use an online code playground. Try a Hello World template on CodePen or CodeSandbox.

Minimal HTML Template

If you prefer to use your own text editor, you can also download this HTML file, edit it, and open it from the local filesystem in your browser. It does a slow runtime code transformation, so don’t use it in production.

Next Steps

Quick Start

Head over to the Quick Start section for a step-by-step introduction to React concepts.

Try the Tutorial for a hands-on practical example.

Complete Development Environment

The lightweight solutions above are the best fit if you are new to React or just experimenting.

When you are ready to build your first application with React, check out the install guides below. These setups are designed to get you up and running with a great developer experience and are ready for production. They include linting, testing, and optimizations built-in; however, they require more time and disk space to set up and install.

Add React to a New App: Create a new app with a fully-featured starter kit.

Add React to an Existing App: Add React to a build system or a larger app.

Include React to a New Application

The easiest way to get started on a new React project is by using a starter kit.

Note:

This page describes setting up a single-page application with everything you need for a comfortable development workflow, including linting, testing, production optimizations, and more. Full-featured tools like these require some time and disk space to install.

If you are looking for a lightweight environment to experiment with React, check out the Try React page instead. A single HTML file is enough to get you started!

Finally, if you’re not building a single-page application, you can either add React to your existing build pipeline or use it from CDN and without a build step.

Create React App

Create React App is the best way to start building a new React single page application. It sets up your development environment so that you can use the latest JavaScript features, provides a nice developer experience, and optimizes your app for production. You’ll need to have Node >= 6 on your machine.

npm install -g create-react-app create-react-app my-app cd my-app npm start

If you have npm 5.2.0+ installed, you may use npx instead.

npx create-react-app my-app cd my-app npm start

Create React App doesn’t handle backend logic or databases; it just creates a frontend build pipeline, so you can use it with any backend you want. It uses build tools like Babel and webpack under the hood, but works with zero configuration.

When you’re ready to deploy to production, running npm run build will create an optimized build of your app in the build folder. You can learn more about Create React App from its README and the User Guide.

Other Starter Kits

We have created a curated list of third-party starter kits that we officially recommend.

They slightly differ in their focus but are all production-ready, well-maintained, and don’t require configuration to get started.

You can also check out a list of other kits contributed by the community.

Add React to an Existing Application

You don’t need to rewrite your app to start using React.

We recommend adding React to a small part of your application, such as an individual widget, so you can see if it works well for your use case.

While React can be used without a build pipeline, we recommend setting it up so you can be more productive. A modern build pipeline typically consists of:

A package manager, such as Yarn or npm. It lets you take advantage of a vast ecosystem of third-party packages, and easily install or update them.

A bundler, such as webpack or Browserify. It lets you write modular code and bundle it together into small packages to optimize load time.

A compiler such as Babel. It lets you write modern JavaScript code that still works in older browsers.

Installing React

Note:

Once installed, we strongly recommend setting up a production build process to ensure you’re using the fast version of React in production.

We recommend using Yarn or npm for managing front-end dependencies. If you’re new to package managers, the Yarn documentation is a good place to get started.

To install React with Yarn, run:

yarn init yarn add react react-dom

To install React with npm, run:

npm init npm install --save react react-dom

Both Yarn and npm download packages from the npm registry.

Note:

To prevent potential incompatibilities, all react packages should use the same version. (This includes react, react-dom, react-test-renderer, etc.)

Enabling ES6 and JSX

We recommend using React with Babel to let you use ES6 and JSX in your JavaScript code. ES6 is a set of modern JavaScript features that make development easier, and JSX is an extension to the JavaScript language that works nicely with React.

The Babel setup instructions explain how to configure Babel in many different build environments. Make sure you install babel-preset-react and babel-preset-env and enable them in your .babelrc configuration, and you’re good to go.

Hello World with ES6 and JSX

We recommend using a bundler like webpack or Browserify, so you can write modular code and bundle it together into small packages to optimize load time.

The smallest React example looks like this:

import React from 'react'; import ReactDOM from 'react-dom'; ReactDOM.render( <h1>Hello, world!</h1>, document.getElementById('root') );

This code renders into a DOM element with the id of root, so you need <div id="root"></div> somewhere in your HTML file.

Similarly, you can render a React component inside a DOM element somewhere inside your existing app written with any other JavaScript UI library.

Learn more about integrating React with existing code.

Development and Production Versions

By default, React includes many helpful warnings. These warnings are very useful in development.

However, they make the development version of React larger and slower so you should use the production version when you deploy the app.

Learn how to tell if your website is serving the right version of React, and how to configure the production build process most efficiently:

Creating a Production Build with Create React App

Creating a Production Build with Single-File Builds

Creating a Production Build with Brunch

Creating a Production Build with Browserify

Creating a Production Build with Rollup

Creating a Production Build with webpack

Using a CDN

If you don’t want to use npm to manage client packages, the react and react-dom npm packages also provide single-file distributions in umd folders. See the CDN page for links.

Download Link to the File:

react js.zip

3.43 MB

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Rich Text Editor Framework for React

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React Javascript - Learn React JS Tutorial within 3 Days in Shristi Tech Labs. Our React JS tutorial course aims at exploring the fundamentals of React and help you understand what this platform is all about.