Cristian Vasta

Cristian Vasta

1576842056

Style Your Application Using Sass with React

When you are developing web applications with React, you know that writing the JavaScript code is only half of the story. The other half is implementing the design using style sheets. When your application becomes larger, using plain CSS style sheets can become tedious and unmaintainable. Sass is one of the most popular alternatives to CSS. It extends the CSS language with variables, mixins, and many other features. It also lets you divide up the style sheets into multiple files.

The Sass Language

Sass source files come in two flavors. The older .sass format has now almost completely replaced by the .scss syntax. The latter is a superset of CSS and lets you paste existing CSS code into the SCSS file without problems. Sass compiles the SCSS source files into a single CSS file with the option of minifying the resulting output. The resulting file can be included in your web page just like any other CSS style sheet.

Many CSS frameworks use Sass to generate their stylesheets. In this tutorial, I will show you how to integrate Zurb’s Foundation framework using Sass mixins. Using this approach keeps the size of your CSS to a minimum. It also gives you the opportunity of more semantic markup.

Create Your React Application with Sass

You will be using the Create React App command-line tool to create the application. First of all, make sure that you have installed Node on your system with a version greater than 10. If you are unsure which Node version you have, open a terminal and run the following command.

node -v

Provided your Node version is up to date, the Create React App command-line tool can be run without any installation. In the terminal, navigate to a directory of your choice and run the following command.

npx create-react-app react-calculator

This will create a new folder, react-calculator initialize the React application and download all necessary packages. After a minute or two, once the process has finished, change into the new folder with the command below.

cd react-calculator

Set Up Authentication for Your React App

Any serious web application will need some sort of user authentication. Implementing your own not only takes time and effort but can also introduce security risks if you don’t know exactly what you are doing. Okta lets you set up authentication with just a few commands.

If you don’t already have an account with Okta, you need to register for a free account. Open your browser and navigate to https://developer.okta.com. Click on Create Free Account and complete the registration process.

Once you are done you can see your Okta developer dashboard. Click on Applications > Add Application to register a new application. On the next screen, choose Single Page App and click Next.

Creating a single-page app

The following screen lets you edit the application’s settings. Under Allowed grant types, check the box Authorization Code. Then make sure that the port number is 3000. Change the base URI to http://localhost:3000/ and set the Login Redirect URI to http://localhost:3000/implicit/callback.

Once you are done, you will see a Client ID which you will need in a minute.

The application settings on your Okta dashboard

Set Up Authentication in Your React Sass App

Okta has created a tool to add authentication to React applications in seconds. It uses the Angular Schematics command-line tool to inject code into your skeleton application. Install the Schematics CLI on your system by running the following command in your terminal.

npm i -g @angular-devkit/schematics-cli@0.803.20

TIP: Depending on your system, you might need to run this command using sudo.

You might be asking why I am telling you to use an Angular tool when you are developing a React application? It turns out that this tool is generic and works for Angular and Vue too! Not only that, but it even has support for Ionic and React Native!

Install OktaDev Schematics:

npm i -E @oktadev/schematics@1.1.1

Now, add Okta for authentication to your React application by running the command below.

schematics @oktadev/schematics:add-auth

You will be asked for your issuer’s URL. This can be found at API > Authorization Servers in your Okta dashboard. .

You will also need the application’s client ID which you received when earlier when setting up your application. Once the questions have been answered, the schematic will insert all the necessary code into your application to provide the authentication flow. Pretty neat, don’t you think?

Implement a React Calculator with Sass

Now it’s time to implement the calculator. This calculator is a nice demonstration of how to use stack operations to process user input and perform mathematical operations. The calculator has four basic operations +, -, *, and /, as well as a % button. It takes care of operator precedence.

Create a new file called src/Calculator.js and paste the following code into it.

import React from 'react';

class Calculator extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      stack: ['='],
      display: '0'
    }
  }

  numberPressed(val) {
    const s = this.state;
    if (typeof s.stack[s.stack.length - 1] !== 'number') {
      s.display = val;
      s.stack.push(parseInt(s.display, 10));
    } else {
      s.display += val;
      s.stack[s.stack.length - 1] = parseInt(s.display, 10);
    }
    this.setState(s);
  }

  operatorPressed(val) {
    const s = this.state;
    const precedenceMap = {'+': 0, '-': 0, '*': 1, '/': 1};
    this.ensureNumber(s);
    const precedence = precedenceMap[val];
    let reduce = true;
    while (reduce) {
      let i = s.stack.length - 1;
      let lastPrecedence = 100;

      while (i >= 0) {
        if (typeof s.stack[i] === 'string') {
          lastPrecedence = precedenceMap[s.stack[i]];
          break;
        }
        i--;
      }
      if (precedence <= lastPrecedence) {
        reduce = this.reduceLast(s);
      } else {
        reduce = false;
      }
    }

    s.stack.push(val);
    this.setState(s);
  }

  equalPressed() {
    const s = this.state;
    this.ensureNumber(s);
    while (this.reduceLast(s)) {}
    s.stack.pop();
    this.setState(s);
  }

  percentPressed() {
    const s = this.state;
    this.ensureNumber(s);
    while (this.reduceLast(s)) {}
    const result = s.stack.pop() / 100;
    s.display = result.toString(10);
    this.setState(s);
  }

  acPressed() {
    const s = this.state;
    s.stack = ['='];
    s.display = '0';
    this.setState(s);
  }

  cePressed() {
    const s = this.state;
    if (typeof s.stack[s.stack.length - 1] === 'number') { s.stack.pop(); }
    s.display = '0';
    this.setState(s);
  }

  ensureNumber(s) {
    if (typeof s.stack[s.stack.length - 1] === 'string') {
      s.stack.push(parseInt(s.display, 10));
    }
  }

  reduceLast(s) {
    if (s.stack.length < 4) { return false; }
    const num2 = s.stack.pop();
    const op = s.stack.pop();
    const num1 = s.stack.pop();
    let result = num1;
    switch (op) {
      case '+': result = num1 + num2;
        break;
      case '-': result = num1 - num2;
        break;
      case '*': result = num1 * num2;
        break;
      case '/': result = num1 / num2;
        break;
      default:
    }
    s.stack.push(result);
    s.display = result.toString(10);
    return true;
  }

  render() {
    return (
      <div className="calculator-container">
        <div className="calculator">
          <p className="display">{this.state.display}</p>
          <div className="calculator-buttons">
            <button className="reset-button" onClick={this.acPressed.bind(this)}>AC</button>
            <button className="reset-button" onClick={this.cePressed.bind(this)}>CE</button>
            <button className="operator-button" onClick={this.percentPressed.bind(this)}>%</button>
            <button className="operator-button" onClick={this.operatorPressed.bind(this, '/')}>÷</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '7')}>7</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '8')}>8</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '9')}>9</button>
            <button className="operator-button" onClick={this.operatorPressed.bind(this, '*')}>x</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '4')}>4</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '5')}>5</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '6')}>6</button>
            <button className="operator-button" onClick={this.operatorPressed.bind(this, '-')}>-</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '1')}>1</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '2')}>2</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '3')}>3</button>
            <button className="operator-button" onClick={this.operatorPressed.bind(this, '+')}>+</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '0')}>0</button>
            <button className="number-button" onClick={this.numberPressed.bind(this, '.')}>.</button>
            <button className="equal-button" onClick={this.equalPressed.bind(this)}>=</button>
          </div>
        </div>
        <div className="calculator-stack">
          <h4>Stack</h4>
          <table>
            <tbody>
              {this.state.stack.map(el => (<tr><td>{el}</td></tr>))}
            </tbody>
          </table>
        </div>
      </div>
    );
  }
}

export default Calculator;

You can see that the HTML of the calculator consists of groups of buttons. Each button is linked to a callback function in the Calculator class. To give you an insight into what the stack contains at any time, a separate div contains a table displaying the stack entries.

Now open src/Home.js and remove the import of logo.svg. Add the following import to the top of the file.

import Calculator from './Calculator';

Further down in the file, replace the render() function with the following.

render() {
  const {authenticated} = this.state;
  let body = null;
  if (authenticated) {
    body = (
      <div className="page-body">
        <div className="login-buttons">
          <button onClick={this.logout}>Logout</button>
        </div>
        <Calculator></Calculator>
      </div>
    );
  } else {
    body = (
      <div className="page-body">
        <div className="login-buttons">
          <button onClick={this.login}>Login</button>
        </div>
      </div>
    );
  }

  return (
    <div className="App">
      <h1>Calculator</h1>
      {body}
    </div>
  );
}

Cool! The calculator should be functional. If you run npm start, you should be able to open your browser at http://localhost:3000 and see a Login button. After logging in you will be able to use the calculator. But we haven’t styled it yet, so it won’t look nice.

Style Your Calculator in React With Sass

Back in the days when CSS was all the rage, it came with a promise of a bright future where content and style were completely separated. Your HTML code would only contain the actual content and the markup would be completely semantic. One of the promises was that class names would only relate to the meaning of the content and not the way that it was displayed on the screen.

Then along came CSS frameworks. They introduced CSS classes for creating a responsive grid layout, such as col-md-4. Other classes determined the size of buttons, such as btn-sm. While incredibly useful, this broke the separation of content and design.

Using Sass together with the Foundation CSS framework, it is possible to regain this strict separation. You might have noticed in the code above, that I have used semantic className attributes. The classes tell you what is contained in a div and not how it should be shown on the screen. This actually has an accessibility advantage because screen readers can group the contents in a meaningful way.

To get started with Sass and Foundation, install two more packages. In the terminal run the following command.

npm i -E sass@1.23.7 foundation-sites@6.6.1

There are actually two Sass packages available through npm. node-sass is generally faster but does require a compilation step during installation. I have opted for the more compatible sass package which is a pure JavaScript implementation of the Sass language.

Copy the default settings from the Foundation folder to your src/ folder by running the following command in a terminal.

cp node_modules/foundation-sites/scss/settings/_settings.scss src/

Now open src/_settings.scss and, and change line 63 (@import 'util/util';) to the following:

@import '~foundation-sites/scss/util/util';

If you look through the settings file, you can see that it defines a huge number of Sass variables. Foundation is highly customizable but the default settings provide a good starting point. Now rename src/App.css to src/App.scss and replace its content with the following.

@import 'settings';
@import '~foundation-sites/scss/foundation';

.App {
  text-align: center;
  @include xy-grid-container;
}

.login-buttons {
  display: flex;
  justify-content: flex-end;

  button {
    @include button;
  }
}

.calculator-container {
  @include xy-grid;
}

.calculator {
  @include xy-cell(12);
  @include breakpoint(medium) {
    @include xy-cell(6);
    @include xy-cell-offset(2);
  }

  .display {
    background-color: $light-gray;
    font-size: 48px;
    padding: 8px;
    overflow: hidden;
  }

  .calculator-buttons {
    @include xy-grid-layout(4, 'button');
  }

  button {
    @include button;

    &.reset-button {
      @include button-style($warning-color, auto, auto);
    }

    &.number-button {
      @include button-style($secondary-color, auto, auto);
    }

    &.equal-button {
      width: calc(50% - 1.25rem);
    }
  }
}

.calculator-stack {
  @include xy-cell(12);
  @include breakpoint(medium) {
    @include xy-cell(2);
    @include xy-cell-offset(1);
  }
}

table {
  @include table;
}

In this style sheet, I have used a number of Sass features. I have used a number of @include statements to include mixins from the Foundation framework.

For example @include xy-cell(6); will add styles to the surrounding class to turn it into a 6 column wide cell. Note also, how I have used the $warning-color and $secondary-color variables to define the button style of the reset and the number buttons.

These variables are defined in the src/_settings.scss file. If you want to learn more about the Sass language, the official documentation is a good starting point.

How I Theme My React App With Sass is a good tutorial that teaches you more about the power of mixins.

To include the stylesheet in your application, open Home.js and change the import of App.css to the following.

import './App.scss';

The React scripts installed by the create-react-app command use webpack to compile and package everything. By default, they also install the module loaders for .scss files. By changing the import above, everything should now work out of the box without any further configuration. Simply run the following command and your perfectly styled calculator will be available on http://localhost:3000.

npm start

Congratulations, you should now see something like this in your browser.

A Sass-styled Calculator

Learn More About React and Sass

In this tutorial, you learned how to use Sass in a React application. Using the create-react-app command makes it extremely easy to include Sass without any further configuration needed. I also showed you how to achieve truly semantic markup in your application while still using a powerful CSS framework. In this tutorial, I used Zurb’s Foundation as an example. You can achieve a similar effect when using the Bootstrap framework.

You can find the source code for this tutorial on GitHub in the oktadeveloper/okta-react-sass-example repository.

#reactjs #javascript #programming

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Buddha Community

Style Your Application Using Sass with React
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

Mathew Rini

1615544450

How to Select and Hire the Best React JS and React Native Developers?

Since March 2020 reached 556 million monthly downloads have increased, It shows that React JS has been steadily growing. React.js also provides a desirable amount of pliancy and efficiency for developing innovative solutions with interactive user interfaces. It’s no surprise that an increasing number of businesses are adopting this technology. How do you select and recruit React.js developers who will propel your project forward? How much does a React developer make? We’ll bring you here all the details you need.

What is React.js?

Facebook built and maintains React.js, an open-source JavaScript library for designing development tools. React.js is used to create single-page applications (SPAs) that can be used in conjunction with React Native to develop native cross-platform apps.

React vs React Native

  • React Native is a platform that uses a collection of mobile-specific components provided by the React kit, while React.js is a JavaScript-based library.
  • React.js and React Native have similar syntax and workflows, but their implementation is quite different.
  • React Native is designed to create native mobile apps that are distinct from those created in Objective-C or Java. React, on the other hand, can be used to develop web apps, hybrid and mobile & desktop applications.
  • React Native, in essence, takes the same conceptual UI cornerstones as standard iOS and Android apps and assembles them using React.js syntax to create a rich mobile experience.

What is the Average React Developer Salary?

In the United States, the average React developer salary is $94,205 a year, or $30-$48 per hour, This is one of the highest among JavaScript developers. The starting salary for junior React.js developers is $60,510 per year, rising to $112,480 for senior roles.

* React.js Developer Salary by Country

  • United States- $120,000
  • Canada - $110,000
  • United Kingdom - $71,820
  • The Netherlands $49,095
  • Spain - $35,423.00
  • France - $44,284
  • Ukraine - $28,990
  • India - $9,843
  • Sweden - $55,173
  • Singapore - $43,801

In context of software developer wage rates, the United States continues to lead. In high-tech cities like San Francisco and New York, average React developer salaries will hit $98K and $114per year, overall.

However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.

It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.

As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.

How to Hire React.js Developers?

  • Conduct thorough candidate research, including portfolios and areas of expertise.
  • Before you sit down with your interviewing panel, do some homework.
  • Examine the final outcome and hire the ideal candidate.

Why is React.js Popular?

React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.

React is scalable. it utilises a single language, For server-client side, and mobile platform.

React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.

React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.

Is there a market for React.js programmers?
The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.

Final thoughts:

As you’ve seen, locating and Hire React js Developer and Hire React Native developer is a difficult challenge. You will have less challenges selecting the correct fit for your projects if you identify growing offshore locations (e.g. India) and take into consideration the details above.

If you want to make this process easier, You can visit our website for more, or else to write a email, we’ll help you to finding top rated React.js and React Native developers easier and with strives to create this operation

#hire-react-js-developer #hire-react-native-developer #react #react-native #react-js #hire-react-js-programmer

Aria Barnes

Aria Barnes

1627031571

React 18: Things You Need To Know About React JS Latest Version

The most awaited version of React 18 is finally out now. Its team has finally revealed the alpha version of React 18 and its plan, though the official launch is still pending. This time the team has tried something and released the plan first to know their user feedback because the last version of React 17 was not that much appreciated among developers.

According to Front-end Frameworks SurveyReact JS has ranked top in the list of most loved frameworks. Thus, the developer communities expect a bit higher from the framework, so they are less appreciative of the previous launch.
ReactJS stats.pngSo, this time React 18 will be a blast. For beginners, the team is working on a new approach. They have called a panel of experts, library authors, educators, and developers to take part in a working group. Initially, it will be a small group.

I am not a part of this release but following the team on their GitHub discussion group. After gathering the information from there, I can say that they have planned much better this time.

React 17 was not able to meet the developer's community. The focus was all primarily centered on making it easier to upgrade React itself. React 18 release will be the opposite. It has a lot of features for react developers.

Read more here: React 18: Things You Need To Know About React JS Latest Version

#hire react js developers #hire react js developers india #react developers india #react js developer #react developer #hire react developers

Aubrey  Price

Aubrey Price

1589722410

Build a simple React Native Pokemon app with React-Navigation

As we start learning new technologies we want to start building something or work on a simple project to get a better understanding of the technology. So, let’s build this simple app.
For this app, we will be using PokeApi to get our pokemon data, and also we will be using Hooks. I am using pokemondb for pokemon sprites. It’s just a personal preference you can use whatever you want.

#react-native #react-native-app #react-navigation #react-native-development #react