How to Type React Events with TypeScript

What type to use for your React event handlers if you use TypeScript

#react #typescript

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How to Type React Events with TypeScript
Autumn  Blick

Autumn Blick

1598839687

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

Cayla  Erdman

Cayla Erdman

1601431482

React Events

In this blog, we will be going to get an overview of React Events, these events occur on various actions like user action or system-generated events. For eg: window resize, web page loading, keypress, mouse hover, mouse click, and many other interactive actions are known as events.

React consists of its own events handling systems which are very similar in the way we use to handling events on DOM elements. And event handling in react known as Synthetic events. The synthetic event is a cross-browser wrapper of the browser’s native event.

Note:

1: React events are named using camelCase, rather than lowercase.

2: With JSX you pass a function as the event handler, rather than a string.

Let’s see now how we declare events in plain HTML and React as well.

Event Declaration in plain HTML

_<button onclick="displayText()">_

_Event declaration in plain HTML_

_</button>_

Event Declaration in Reactjs

_<button onClick={displayText()}_

_Event declaration in ReactJS_

_</button>_

Another difference in the react event is that we cannot return false to prevent the default behavior. We must call the preventDefault event explicitly to prevent the default behavior.

In plain HTML, to prevent the default link behavior of showing alert in a text.

<a onclick="console.log('Learning react events.');

return false"> Click Me</a>

Similarly, we write the same code in react as:

function ReactActionLink() {
   function handleClick(e) { 
    e.preventDefault();
    console.log('Learning react events.');
}
return(
    <a href="#" onClick={handleClick}>Click me</a>
    );
}

In this snippet, e is a synthetic event_. _Also, you don’t have to worry about cross-browser compatibility. as these synthetic events define according to the W3C standards.

#event #react ##events in reactjs ##react-events ##reactjs #react native

Verdie  Murray

Verdie Murray

1636236360

How to add Cypress for Create React App with TypeScript

In this lesson we look at how to add #cypress with code coverage support for a Create #React App application with #TypeScript.

In the end you will have a developer flow that can save you a bunch of time in testing effort 

#react-native #react #cypress #typescript 

Typescript in React — How to Add

In this article, I will be showing you how to add typescript from your existing react application.

If you are a software developer that started from strongly typed programming languages such as Java and C sharp, you might want to always have a type checking and see errors beforehand. Unlike without adding typescript, you only see the type errors after you’ve compiled and run the code.

It serves as an early and preventive measure while you are developing your application.

You can also follow the demonstration via video:

How to add Typescript in React

First, setup a react application using the create-react-app command

npx create-react-app

We can add typescript to this project by adding the following node packages

npm install --save typescript @types/node @types/react @types/react-dom @types/jest

What this does is that you are installing the following packages:

  • Typescript — installs the base typescript language
  • Node
  • React
  • React-DOM
  • Jest — A testing framework

After installing, we can checkout our current project and here you can see that extension of the files are still .JS, this will still work as expected.

But if you want to leverage typescript, you will start replacing it with the .TS and .TSX extensions.

.TS — is a replacement for normal javascript files

.TSX — is a replacement for files with react’s JSX render components

// filename: Header.ts

import React from 'react';
export default function Header(){
    return (
        <>
            <p>This is a header section</p>
        </>
    );
}

If we only add with .TS extension, it will cause an error as typescript does not recognize what is the content of the returned statement which is supposed to be JSX.

What we will do is to rename it to .TSX and see what happens.

#typescript-with-react #how-to #typescript #react #strongly-typed

Verdie  Murray

Verdie Murray

1638074460

How to Ignore Errors in JSX with TypeScript and React (Example)

This quick lesson demonstrates how to ignore errors in a JSX / #React file with #TypeScript

#typescript #react