React Email Validation Example

By Hardik Savani | May 31, 2020 | Category : React JS


This post is focused on how to add email validation in react js. This article goes in detailed on react email validation regex example. i explained simply step by step email validation regex react js. you'll learn react email input validation.

Form validation is a primary part of any application. we always require to add input validation when we are adding form in our application. almost form has email and we must need to validate email address is valid ote not.

So, here i will give you step by step instruction of how to add email address validation in react js application. in this example we will take name, email and comment input and add validation for require and email now. also display error messages if they enter wrong values.

Solution:

if (typeof input["email"] !== "undefined") {

var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);

if (!pattern.test(input["email"])) {

isValid = false;

errors["email"] = "Please enter valid email address.";

}

}

Let's follow bellow step and you will find preview as bellow:

Preview:

Step 1: Install React App

In our first step, we need to download react js fresh app using bellow command, if you didn't install yet then.

npx create-react-app my-app

Step 2: Create DemoForm Component

In this step, we will create DemoForm.js component file and we will write code of form validation. so let's add code as bellow:

src/DemoForm.js

import React from 'react';

class DemoForm extends React.Component {

constructor() {

super();

this.state = {

input: {},

errors: {}

};

this.handleChange = this.handleChange.bind(this);

this.handleSubmit = this.handleSubmit.bind(this);

}

handleChange(event) {

let input = this.state.input;

input[event.target.name] = event.target.value;

this.setState({

input

});

}

handleSubmit(event) {

event.preventDefault();

if(this.validate()){

console.log(this.state);

let input = {};

input["name"] = "";

input["email"] = "";

input["comment"] = "";

this.setState({input:input});

alert('Demo Form is submited');

}

}

validate(){

let input = this.state.input;

let errors = {};

let isValid = true;

if (!input["name"]) {

isValid = false;

errors["name"] = "Please enter your name.";

}

if (!input["email"]) {

isValid = false;

errors["email"] = "Please enter your email Address.";

}

if (typeof input["email"] !== "undefined") {

var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);

if (!pattern.test(input["email"])) {

isValid = false;

errors["email"] = "Please enter valid email address.";

}

}

if (!input["comment"]) {

isValid = false;

errors["comment"] = "Please enter your comment.";

}

this.setState({

errors: errors

});

return isValid;

}

render() {

return (

<div>

<h1>React Form Validation Example - ItSolutionStuff.com</h1>

<form onSubmit={this.handleSubmit}>

<div class="form-group">

<label for="name">Name:</label>

<input

type="text"

name="name"

value={this.state.input.name}

onChange={this.handleChange}

class="form-control"

placeholder="Enter name"

id="name" />

<div className="text-danger">{this.state.errors.name}</div>

</div>

<div class="form-group">

<label for="email">Email Address:</label>

<input

type="text"

name="email"

value={this.state.input.email}

onChange={this.handleChange}

class="form-control"

placeholder="Enter email"

id="email" />

<div className="text-danger">{this.state.errors.email}</div>

</div>

<div class="form-group">

<label for="comment">Comment:</label>

<textarea

name="comment"

value={this.state.input.comment}

onChange={this.handleChange}

placeholder="Enter comment"

class="form-control" />

<div className="text-danger">{this.state.errors.comment}</div>

</div>

<input type="submit" value="Submit" class="btn btn-success" />

</form>

</div>

);

}

}

export default DemoForm;

Step 3: Import Component

In this step, we will import DemoFormcomponent in index.js main file. so let's update index.js file as bellow:

Here, i used bootstrap with react. so, if you want to use bootstrap in your app too then follow this tutorial: Install Bootstrap 4 in React JS.

src/index.js

import React from 'react';

import ReactDOM from 'react-dom';

import * as serviceWorker from './serviceWorker';

import 'bootstrap/dist/css/bootstrap.min.css';

import DemoForm from './DemoForm';

ReactDOM.render(

<React.StrictMode>

<div className="container">

<DemoForm />

</div>

</React.StrictMode>,

document.getElementById('root')

);

serviceWorker.unregister();

Now we are ready to run our application, so let's run using bellow command:

npm start

Open bellow url:

http://localhost:3000

I hope it can help you...



Tags : React JS


Hardik Savani
My name is Hardik Savani. I'm a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Javascript, JQuery, Laravel, Codeigniter, VueJS, AngularJS and Bootstrap from the early stage.
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***Do you want me hire for your Project Work? Then Contact US.

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