Friday, April 19, 2024
Bootstrap 4Reactjs

Reactjs Form Validation Working Demo

Reactjs Form Validation Working Demo

Hello friends, welcome back to my blog. Today in this blog post, I am going to show you, Reactjs Form Validation Working Demo.

In this we will do:

  1. Email Format Validation.
  2. Confirm Passwords Validation.
Reactjs Form Validation Working Demo
React Custom Form Validation Working Demo

For reactjs new comers, please check the below link:

Reactjs Basic Tutorials

Friends now I proceed onwards and here is the working code snippet for Reactjs Form Validation Working Demo and please use this carefully to avoid the mistakes:

1. Firstly, we need fresh reactjs setup and for that, we need to run below commands into out terminal and also we should have latest node version installed on our system:

npx create-react-app reacttemplate

cd reacttemplate

npm start

2. Now we need to run below commands into our project terminal to get bootstrap and related modules into our reactjs application:

npm install bootstrap --save

npm start //For start project again

3. Finally for the main output, we need to add below code into our reacttemplate/src/App.js file or if you have fresh setup then you can replace reacttemplate/src/App.js file code with below code:

import React from "react";
import './App.css'
import 'bootstrap/dist/css/bootstrap.min.css';

class App extends React.Component {
  //Settings the varaibles
  constructor(props) {
    this.state = {
      fields: {},
      errors: {}

  //Handle Validation
  handleValidation() {
    let fields = this.state.fields;
    let errors = {};
    let formIsValid = true;

    //Email Validation
    if (!fields["email"]) {
      formIsValid = false;
      errors["email"] = "*This field is required."
    function validateEmail(email) {
        const re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
        return re.test(email);
    //Email valid validation
    if (typeof fields["email"] != "undefined") {
        if (!validateEmail(fields["email"])) 
        formIsValid = false;
        errors["email"] = "*Email is not valid."

    //Pssword Validation
    if (!fields["password"]) {
      formIsValid = false;
      errors["password"] = "*This field is required."

    //Confirm Password Validation
    if (!fields["cpassword"]) {
      formIsValid = false;
      errors["cpassword"] = "*This field is required."

    //Confirm Password Match Validation

    if (fields["password"] !== fields["cpassword"]) {
      formIsValid = false;
      errors["cpassword"] = "*Password doesn't match."

    //setting the errors messages
    this.setState({ errors: errors });
    return formIsValid;
  contactSubmit(e) {
    if (this.handleValidation()) {
    else {
      // alert("Error");

  //this will set and get value from inputs fields
  handleChange(field, e) {
    let fields = this.state.fields;
    fields[field] =;
    this.setState({ fields });
  render() {
    return (
      <div className="main_container">
        <div className="container">
          <div className="row h-100 justify-content-center align-items-center bg-light mt-5">
            <div className="col-4 mt-5 mb-5 pt-5 pb-4 pl-4 pr-4">
              <h2 className="text-left mt-1 mb-3">Sign Up</h2>
              <form name="contactform" onSubmit={this.contactSubmit.bind(this)}>
                <div className="form-group pb-2">
                  <input borderColor={this.state.errors["email"] ? "red" : ""} type="text" className="form-control" placeholder="E-Mail" refs="email" onChange={this.handleChange.bind(this, "email")} value={this.state.fields["email"]} />
                  <span showerror={this.state.errors["email"] ? "yes" : ""} className="pl-3" style={{ color: "red", display: "none" }}>{this.state.errors["email"]}</span>

                <div className="form-group pb-2">
                  <input borderColor={this.state.errors["password"] ? "red" : ""} type="password" className="form-control" placeholder="Password" refs="password" onChange={this.handleChange.bind(this, "password")} value={this.state.fields["password"]} />
                  <span showerror={this.state.errors["password"] ? "yes" : ""} className="pl-3" style={{ color: "red", display: "none" }}>{this.state.errors["password"]}</span>

                <div className="form-group pb-4">
                  <input borderColor={this.state.errors["cpassword"] ? "red" : ""} type="password" className="form-control" placeholder="Confirm Password" refs="cpassword" onChange={this.handleChange.bind(this, "cpassword")} value={this.state.fields["cpassword"]} />
                  <span showerror={this.state.errors["cpassword"] ? "yes" : ""} className="pl-3" style={{ color: "red", display: "none" }}>{this.state.errors["cpassword"]}</span>

                <div className="form-group">
                  <button className="btn btn-primary button_contenkt mb-3">Continue</button>




export default App;

4. Now friends, we need to below code into our reacttemplate/src/App.css file for some custom styling:

    display: block!important;

Now we are done friends. If you have any kind of query or suggestion or any requirement then feel free to comment below.

Note: Friends, I just tell the basic setup and things, you can change the code according to your requirements.

I will appreciate that if you will tell your views for this post. Nothing matters if your views will be good or bad.



the authortherichpost
Hello to all. Welcome to Myself Ajay Malhotra and I am freelance full stack developer. I love coding. I know WordPress, Core php, Angularjs, Angular 14, Angular 15, Angular 16, Angular 17, Bootstrap 5, Nodejs, Laravel, Codeigniter, Shopify, Squarespace, jQuery, Google Map Api, Vuejs, Reactjs, Big commerce etc.

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