Hello Devs,
In this tutorial, we will learn React Phone Number Validation Example
Form validation is a primary part of any application. we always have to add input validation when we have to add form in our application. if you want to add phone number validation like it must be 10 digit mobile number or 11 digit, 12 digit then you can easily do it from this example.
Follow this step by step guide below.
Solution:
if (typeof input["phone"] !== "undefined") {
var pattern = new RegExp(/^[0-9\b]+$/);
if (!pattern.test(input["phone"])) {
isValid = false;
errors["phone"] = "Please enter only number.";
}else if(input["phone"].length != 10){
isValid = false;
errors["phone"] = "Please enter valid phone number.";
}
}
Step 1: Install React App
npx create-react-app my-app
Step 2: Create DemoForm Component
src/DemoForm.js
import React from 'react';
class DemoForm extends React.Component {
constructor() {
super();
this.state = {
input: {},
errors: {}
};
this.handleChange = this.handleChange.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleChange(event) {
let input = this.state.input;
input[event.target.name] = event.target.value;
this.setState({
input
});
}
handleSubmit(event) {
event.preventDefault();
if(this.validate()){
console.log(this.state);
let input = {};
input["name"] = "";
input["email"] = "";
input["phone"] = "";
input["comment"] = "";
this.setState({input:input});
alert('Demo Form is submited');
}
}
validate(){
let input = this.state.input;
let errors = {};
let isValid = true;
if (!input["name"]) {
isValid = false;
errors["name"] = "Please enter your name.";
}
if (!input["email"]) {
isValid = false;
errors["email"] = "Please enter your email Address.";
}
if (typeof input["email"] !== "undefined") {
var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
if (!pattern.test(input["email"])) {
isValid = false;
errors["email"] = "Please enter valid email address.";
}
}
if (!input["phone"]) {
isValid = false;
errors["phone"] = "Please enter your phone number.";
}
if (typeof input["phone"] !== "undefined") {
var pattern = new RegExp(/^[0-9\b]+$/);
if (!pattern.test(input["phone"])) {
isValid = false;
errors["phone"] = "Please enter only number.";
}else if(input["phone"].length != 10){
isValid = false;
errors["phone"] = "Please enter valid phone number.";
}
}
if (!input["comment"]) {
isValid = false;
errors["comment"] = "Please enter your comment.";
}
this.setState({
errors: errors
});
return isValid;
}
render() {
return (
<div>
<h1>React Validation For Phone Number Example - rathorji.in</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="Phone">Phone:</label>
<input
type="text"
name="phone"
value={this.state.input.phone}
onChange={this.handleChange}
class="form-control"
placeholder="Enter phone"
id="email" />
<div className="text-danger">{this.state.errors.phone}</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
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();
Run this below command:
npm start
Open this URL:
http://localhost:3000
May this example help you.