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Learn to Build an Application with ReactJS in 30 Minutes

  • By Nagarani Gorantla
  • January 2, 2020

ReactJS has become a versatile development platform for developers across the globe. It is a specially designed framework for performance and productivity.
Today let’s see how to make a simple “note-taking” application with ReactJS in under 30 minutes.
react mobile - note-taking app

What is React?

React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It lets you compose complex UIs from small and isolated pieces of code called “Components”.

Install React

To get started, open the command line interface run the below command,
>> npm install -g create-react-app
Note: When using create-react-app ensure you are in the desired directory or folder location as this command will create the project folder in the current path.

Creating “Note-app” application in React

In the command line interface, need to run below the line so that note-app will be created,
>>npx create-react-app note-app
The entire process is automated and begins with creating a new React app folder for the project, then install packages and dependencies. Default, packages include react, react-dom and react-scripts and it will take a few minutes

Run an application in React

>> cd note-app
>> npm start
Default In local, React applications are running in http://localhost:3000/ it looks like this,
react mobile app
In this application, I’m going to use “react-bootstrap” for responsive and icons from “font-awesome”.
Here, we can find how to use these packages in our application

How to use React-bootstrap?

Install it with this following command,
>> npm install react-bootstrap bootstrap
Below stylesheet link, we need to add in index.html

rel="stylesheet"   href=""   integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"

Usage in Application

import { Button } from 'react-bootstrap';

In the render return statement like follow.

<Button variant="secondary">Close </Button>

How to use Fontawesome in React Applications?

Install the following packages using npm,
>> npm i –save @fortawesome/fontawesome-svg-core @fortawesome/free-solid-svg-icons @fortawesome/react-fontawesome
Usage in application

import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faPlus} from '@fortawesome/free-solid-svg-icons'

In the render return statement like follow,

<FontAwesomeIcon icon={faPlus} />  New Note</Button>

How to display notes as Card?

Initialized the constructor to App component,

    this.state = {
      notes: props.notes ,
      show: false,
      title: '',
      content: ''

In the App component, render function like,

       {, i )=> {
            return <Col xs={6} md={3} key={i}>
              <Card className="text-center" key={i} >
                <div className="close-icon text-danger" onClick={ (e) => this.removeCard(e, note)}>
                  <FontAwesomeIcon icon={faTimes} />      
                </div >
                <Card.Body onClick={(e) => this.updateNote(note, i, e)}>
                <Card.Footer className="text-muted">2 days ago</Card.Footer>

Create a new note

Here, I’ve created one button so when we are clicking on that the form modal will be open while clicking on the save button the note added to state notes then will display in notes Dashboard.
The button code with a click be like,

 <Button onClick={ () => this.handleShow('new')}>

The form modal will be like,

     <Modal show={} onHide={this.handleClose} centered>
        <Modal.Header closeButton>
          <Modal.Title>{this.state.modalTitle} Note</Modal.Title>
          <Form  onSubmit={this.submitNote}>
              <Form.Label>Title :-</Form.Label>
              <Form.Control as="textarea" rows="1" name="title" value={this.state.title} onChange={this.changeTitle}>
              <Form.Label>Content :-</Form.Label>
              <Form.Control as="textarea" rows="3" name="content" value={this.state.content} onChange={this.changeContent}>
            <Button variant="secondary" onClick={this.handleClose}>
            <Button variant="primary" type="submit">
              Save Changes

In the handleShow() function maintains showing the modal and initializing the form values like,

  handleShow = (type) => {
    if (type === 'new'){
      this.setState({id: 0, title: '', content: '', modalTitle: 'Create a New'});
    this.setState({show: true});

While closing, we need to set the show state as false.

  handleClose = () => {
    this.setState( {show: false});

When submitting the changes, form values adding to notes array.

  this.updatedNotes =  [...this.state.notes, {
        id: this.state.notes[this.state.notes.length - 1] ? this.state.notes[this.state.notes.length - 1].id + 1 : 1,
        title: this.state.title || 'Untitled Title', 
        content: this.state.content || 'Untitled Content'
      notes: this.updatedNotes,
      title: '',
      content: '',
      show: false

Update a note

If we want to update existing notes then we just need to click on a notecard, after that form modal opens with respective card values

 updateNote = (note, index, event) => {
      title: note.title,
      content: note.content, 
      show: true,
      modalTitle: 'Update'

While saving the changes, it will update in the existing notes as,

this.updatedNotes = => {
     if ( === {
       note.title = this.state.title;
       note.content = this.state.content;
     return note;
      notes: this.updatedNotes,
      title: '',
      content: '',
      show: false

Remove the Card

Remove icon will be present for each card if we are clicking on the button, for that we are calling removeCard() function and based on Card Id we are removing that particular card from the notes list.

 removeCard = (event, note) => {
    this.allNotes = [...this.state.notes];
    const noteIndex = this.allNotes.indexOf(note);
    this.allNotes.splice(noteIndex, 1);
      notes:  this.allNotes

You can find the code available on Github here.
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Nagarani Gorantla

Software Engineer having 2 years of experience in Web Development, hands on expertise in Ruby, Ruby On Rails, Angular and CMS. An Active ally of Social services and Blood camps.