React is very popular front-end framework from facebook for creating single page apps. Let's start by creating the basic Login form; users can login with their credentials in our react application. Before accessing the app you asked to sign-in with their email and password in the apps.
You should check out the React Docs.
You should check out the React Docs.
Some noted points for the below example -
1. The useState gives you the current value of the variable you want to store in the state and a function to set the new value.
2. The setEmail and setPassword functions to store what the user types in — e.target.value.
3. The autoFocus sets focus to email field.
4. The validateForm function is used to validate the form after click on submit form.
5. Finally when the form is submitted, we trigger our handleSubmitcallback.
First install create-react-app globally -
npm install -g create-react-app
Create new project for in your Documents -
create-react-app logindemo
cd logindemo
npm start
If you have yarn package manager installed then run npm start.
Open localhost:3000 in your browser to see basic react app in action.
Now that we are done with setup process let’s see the below example code-
As an Example,
Create a new file src/Login.js and add the following :-
Create a new file src/Login.js and add the following :-
import React, { useState } from "react";
import { Button } from "react-bootstrap";
export default function Login(props) {
const [email, setEmail] = useState('');
const [password, setPassword] = useState('');
function validateForm() {
return email.length > 0 && password.length > 0;
}
function handleSubmit(event) {
event.preventDefault();
//Validate Your email and Password from API call
//If everything id ok, redirect to user dashboard otherwise redirect to login page.
if (authenticateUser(email, password){
window.localStorage.setItem('token', true);
props.history.push("/user/dashboard");
}
else {
props.history.push("/login");
}
}
return (
"container">
"row justify-content-md-center">
"card">
"card-header">Login
"card-body">
"form-group">
"email" className="form-control" aria-describedby="emailHelp" placeholder="Enter email" autoFocus
value={email} onChange={e => setEmail(e.target.value)} />
"form-group">
"password" className="form-control" placeholder="Password" value={password}
onChange={e => setPassword(e.target.value)} />
)
}
The login result page looks like -
