React Tutorial

React Tutorial

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React Hooks Tutorial for Beginners - useLockedBody()

This React hook is used to block the scrolling of the page.

A good example of a use case is when you need to open a modal.

For flexibility, this hook offers 2 APIs:

  • Use it as we would use a useState (example 1)
  • Use it with our own logic, coming from a props or redux for example (example 2)

Finally, you can optionally change the reflow padding if you have another sidebar size than the default (15px)

The Hook

import { useEffect, useLayoutEffect, useState } from 'react'

type ReturnType = [boolean, (locked: boolean) => void]

function useLockedBody(initialLocked = false): ReturnType {
  const [locked, setLocked] = useState(initialLocked)

  // Do the side effect before render
  useLayoutEffect(() => {
    if (!locked) {
      return
    }

    // Save initial body style
    const originalOverflow = document.body.style.overflow
    const originalPaddingRight = document.body.style.paddingRight

    // Lock body scroll
    document.body.style.overflow = 'hidden'

    // Get the scrollBar width
    const root = document.getElementById('___gatsby') // or root
    const scrollBarWidth = root ? root.offsetWidth - root.scrollWidth : 0

    // Avoid width reflow
    if (scrollBarWidth) {
      document.body.style.paddingRight = `${scrollBarWidth}px`
    }

    return () => {
      document.body.style.overflow = originalOverflow

      if (scrollBarWidth) {
        document.body.style.paddingRight = originalPaddingRight
      }
    }
  }, [locked])

  // Update state if initialValue changes
  useEffect(() => {
    if (locked !== initialLocked) {
      setLocked(initialLocked)
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [initialLocked])

  return [locked, setLocked]
}

export default useLockedBody

Usage

import React, { CSSProperties, useState } from 'react'

import { useLockedBody } from 'usehooks-ts'

const fixedCenterStyle: CSSProperties = {
  position: 'fixed',
  top: '50%',
  left: '50%',
  transform: 'translate(-50%, -50%)',
}

const fakeScrollableStyle: CSSProperties = {
  minHeight: '150vh',
  background: 'linear-gradient(palegreen, palegoldenrod, palevioletred)',
}

// Example 1: useLockedBody as useState()
export default function App() {
  const [locked, setLocked] = useLockedBody()

  const toggleLocked = () => {
    setLocked(!locked)
  }

  return (
    <div style={fakeScrollableStyle}>
      <button style={fixedCenterStyle} onClick={toggleLocked}>
        {locked ? 'unlock scroll' : 'lock scroll'}
      </button>
    </div>
  )
}

// Example 2: useLockedBody with our custom state
export function App2() {
  const [locked, setLocked] = useState(false)

  const toggleLocked = () => {
    setLocked(!locked)
  }

  useLockedBody(locked)

  return (
    <div style={fakeScrollableStyle}>
      <button style={fixedCenterStyle} onClick={toggleLocked}>
        {locked ? 'unlock scroll' : 'lock scroll'}
      </button>
    </div>
  )
}

Original article source at https://usehooks-ts.com

#react #hook #reachook #javascript #typescript #programming #developer #webdev 

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React Hooks Tutorial for Beginners - useLockedBody()
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

What are hooks in React JS? - INFO AT ONE

In this article, you will learn what are hooks in React JS? and when to use react hooks? React JS is developed by Facebook in the year 2013. There are many students and the new developers who have confusion between react and hooks in react. Well, it is not different, react is a programming language and hooks is a function which is used in react programming language.
Read More:- https://infoatone.com/what-are-hooks-in-react-js/

#react #hooks in react #react hooks example #react js projects for beginners #what are hooks in react js? #when to use react hooks

Dipesh Malvia

Dipesh Malvia

1628751894

Learn React JS Hooks | React Hooks Tutorial | React Hooks Explained | React Hooks for Beginners

Learn React JS Hooks | React Hooks Tutorial | React Hooks Explained | React Hooks for Beginners

This video is a complete React Hooks Crash Course for beginners in. React hooks are building blocks of function component. We will cover each react hook with detailed explanation and examples. We will see how when we should use any react hook and when not. At last we will build a custom react hook.

🔥 Video contents... ENJOY 👇 

  • 0:00:00 - Intro 
  • 0:02:22 - useState 
  • 0:18:38 - useEffect 
  • 0:28:31 - useRef 
  • 0:38:33 - useMemo 
  • 0:49:16 - useCallback 
  • 0:58:56 - useContext 
  • 1:08:45 - useReducer 
  • 1:24:16 - Build Custom React Hook 
  • 1:36:47 - Outro

***Checkout my crash courses for get started with web development*** 

  • HTML5 Crash Course in 1 Hour - https://youtu.be/Aj3QFsmsagc 
  • CSS Crash Course in 1 Hour - https://youtu.be/nYsk_U_A_lc 
  • JavaScript Tutorial in 2 Hours - https://youtu.be/sptS-bgg8Ro 

🔗 Social Medias 🔗 

  • Twitter: https://twitter.com/IMDmalvia 
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⭐️ Hashtags ⭐️

 #react #reacthooks #beginners #tutorial

Jeromy  Lowe

Jeromy Lowe

1599097440

Data Visualization in R with ggplot2: A Beginner Tutorial

A famous general is thought to have said, “A good sketch is better than a long speech.” That advice may have come from the battlefield, but it’s applicable in lots of other areas — including data science. “Sketching” out our data by visualizing it using ggplot2 in R is more impactful than simply describing the trends we find.

This is why we visualize data. We visualize data because it’s easier to learn from something that we can see rather than read. And thankfully for data analysts and data scientists who use R, there’s a tidyverse package called ggplot2 that makes data visualization a snap!

In this blog post, we’ll learn how to take some data and produce a visualization using R. To work through it, it’s best if you already have an understanding of R programming syntax, but you don’t need to be an expert or have any prior experience working with ggplot2

#data science tutorials #beginner #ggplot2 #r #r tutorial #r tutorials #rstats #tutorial #tutorials

Hayden Slater

1599277908

Validating React Forms With React-Hook-Form

Validating inputs is very often required. For example, when you want to make sure two passwords inputs are the same, an email input should in fact be an email or that the input is not too long. This is can be easily done using React Hook From. In this article, I will show you how.

Required Fields

The most simple, yet very common, validation is to make sure that an input component contains input from the user. React Hook Form basic concept is to register input tags to the form by passing register() to the tag’s ref attribute. As we can see here:

#react-native #react #react-hook-form #react-hook