Category: Front End

import React, { useState } from 'react';
import { BrowserRouter } from 'react-router-dom';
import './App.css';

function App() {
	var [showChat, setShowChat ] = useState('hide');
	var [showButton , setShowButton ] = useState('show');
	function handleChatShow() {
		setShowChat((showChat === "hide") ? "show" : "hide");
		setShowButton((showChat === "hide") ? "hide" : "show");
	}
	return (
		<>
			<button className={"open-button "+showButton} id="openchat" onClick={handleChatShow}></button>
			<div className={"chat_box form-container "+showChat} id="chatbubble">
				<button type="button" className="btn cancel" onClick={handleChatShow}>—</button>
				Text here
			</div>
		</>
	);
}
export default App;

API

We will use a free Login API from MeCallAPI.com with the following detail:

• Method: POST
• URL: https://www.mecallapi.com/api/login
• Body (JSON):

{
    "username": "karn.yong@mecallapi.com",
    "password": "mecallapi"
}

• Response:

{
    "status": "ok",
    "message": "Logged in",
    "accessToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
    "user": {
        "id": 1,
        "fname": "Karn",
        "lname": "Yong",
        "username": "karn.yong@mecallapi.com",
        "email": "karn.yong@mecallapi.com",
        "avatar": "https://www.mecallapi.com/users/1.png"
    }
}

For more APIs with populated fake data, such as user list and user profile authentication with JWT, these can be found at MeCallAPI.com.

Add packages

We will add the following packages to our application:

• Material UI
• react-router-dom
• Sweetalert

npm i @material-ui/core @material-ui/icons react-router-dom sweetalert

Create screen for Sign-in

Create Sigin.js (From line 41 is the use of login API from MeCallAPI.com)

import React, { useState } from 'react';
import swal from 'sweetalert';
import './Login.css';

async function loginUser(credentials) {
	return fetch('https://www.mecallapi.com/api/login', {
		method: 'POST',
		headers: {
			'Content-Type': 'application/json'
		},
		body: JSON.stringify(credentials)
	})
    .then(data => data.json())
}

const Login = props => {
	const [username, setUserName] = useState();
	const [password, setPassword] = useState();
	const handleSubmit = async e => {
		e.preventDefault();
		const response = await loginUser({
			username,
			password
		});
		if ('accessToken' in response) {
			swal("Success", response.message, "success", {
				buttons: false,
				timer: 2000,
			})
			.then((value) => {
				localStorage.setItem('accessToken', response['accessToken']);
				localStorage.setItem('user', JSON.stringify(response['user']));
				window.location.href = "/admin";
			});
		} else {
			swal("Failed", response.message, "error");
		}
	}
	return (
		<>
			<div id="page-wrap" className="my-4 mx-4">
				<h1>Login</h1>
				<form noValidate onSubmit={handleSubmit}>
				  <div className="mb-3">
					<label for="email" className="form-label">Email address</label>
					<input
					  required
					  id="email"
					  name="email"
					  className="form-control"
					  aria-describedby="emailHelp"
					  onChange={e => setUserName(e.target.value)}
					/>
				  </div>
				  <div className="mb-3">
					<label for="password" className="form-label">Password</label>
					<input
					  id="password"
					  name="password"
					  type="password"
					  className="form-control"
					  onChange={e => setPassword(e.target.value)}
					/>
				  </div>
				  <div className="mb-3 form-check">
					<input type="checkbox" className="form-check-input" id="exampleCheck1" />
					<label className="form-check-label" for="exampleCheck1">Remember me</label>
				  </div>
				  <button type="submit" className="btn btn-primary">Submit</button>
				</form>
			</div>
		</>
	)
}
export default Login;

Now you can update your menu to show correct menu items for logged in/out states:

import React, { lazy } from 'react';
import { Link } from 'react-router-dom';
import './Sidebar.css';

const Menu = lazy(() => import('react-burger-menu/lib/menus/elastic'));


const Sidebar = props => {
	const isLoggedIn = localStorage.getItem('accessToken');
    
	const handleLogout = () => {
		localStorage.removeItem("accessToken");
		localStorage.removeItem("user");
		window.location.href = "/";
	};
	
	let adminLink, loggedLink;
    if (isLoggedIn) {
		adminLink = <Link className="menu-item" to="/admin">Admin</Link>;
		loggedLink = <div className="menu-item" onClick={handleLogout}>Logout</div>;
    } else {
		loggedLink = <Link className="menu-item" to="/login">Login</Link>;
    }
	
	return (
		<Menu>
      <Link className="menu-item" to="/">
        Home
      </Link>
      <Link className="menu-item" to="/favourites">
        Favourites
      </Link>
	  {adminLink}
	  {loggedLink}
    </Menu>
	);
}
export default Sidebar;

Hold ID of each row inside an array that you set when clicked. Use if statement inside JSX to check whether array has the ID value and show selected icon if it does, empty icon if it doesn’t.

const List = props => {
	var pagedList = props.pagedList;
	const [isFave, setIsFave] = useState([]);
	
	const selectFavourite = e => {
		const { id } = e.target;
		if(isFave.includes(id)){
			setIsFave(isFave.filter(item => item !== id));
		}else{
			setIsFave([...isFave, id]);
		}
    	}
	console.log(isFave);
    	return ( 
		<>
		{pagedList.map((row,i) => {
			return (
				<div key={i} className="list-card row">
					<div className="col-12 col-md g-0 list-content">
					<div 
						className="favouriteButton" 
						id={row.id_pg} 
						onClick={selectFavourite}
					>
						{isFave.includes(row.id_pg) ? <FavoriteIcon /> : <FavoriteBorderIcon /> }
					</div>
					</div>
				</div>
			);
		})}
		</>
    	);  
}  
export default List

We get the checkboxes from an array of results called list. We use one of the array values to set the checked states and hold it in a variable called isCheck.

All checkboxes in the list have an onChange function called selectCheckbox which sets the checkbox ID in the isCheck array when checked and removes when unchecked.

IMPORTANT: To control the selecting all checkboxes, you need to add a checked attribute onto each individual checkbox that checks if the isCheck array includes the current array value.

In the main component below we have the select all checkbox. We have an onChange function called selectAll which toggles the true/false value for isCheckAll variable. Then it sets all checkboxes or empties all checkboxes array of isCheck depending on the true/false value of isCheckAll.

import React, { lazy, useEffect, useState } from 'react';
import axios from 'axios';

const MyList = lazy(() => import('../../components/MyList/MyList'));

const YourComponent = props => {
	const [isCheckAll, setIsCheckAll] = useState(false);
	const [isCheck, setIsCheck] = useState([]);
	var [list, setList] = useState([]);
	useEffect(() => {
		getRows()
	}, []);
	function getRows() {
		let getUrl = 'https://domain.com/getrows.php';
		axios({
			method: "get",
			url: getUrl,
		}).then((response) => {
			let data = response.data;
			setList(data.listRows);
		}, (error) => {
			console.log(error)
		})
	}
	const selectAll = e => {
		setIsCheckAll(!isCheckAll);
		setIsCheck(list.map(row => row.id_pg));
		if (isCheckAll) {
		  setIsCheck([]);
		}
	};
	return (
		<>
			<input
				id="selectAllCheckbox"
				name="selectAllCheckbox"
				type="checkbox"
				value=""
				className="form-check-input"
				onChange={selectAll}
			/>
			{list.length > 0 &&
			<MyList 
				list={list} 
				isCheck={isCheck}
				setIsCheck={setIsCheck.bind(this)} 
			/>
			}
		</>
	)
}
export default YourComponent;

Next create the checkboxes list component:

import React from 'react'
import './List.css'; 

const MyList = props => {
	var list= props.list;
	const isCheck = props.isCheck;

	const selectCheckbox = e => {
		const { id, checked } = e.target;
		props.setIsCheck([...isCheck, id]);
		if (!checked) {
			props.setIsCheck(isCheck.filter(item => item !== id));
		}
	};
	console.log(isCheck);
    return ( 
		<>
		{list.map((row,i) => {
			return (
			<div key={i} className="row">
				<div className="col-1">
					<input
						id={row.id_pg}
						name="select"
						type="checkbox"
						className="form-check-input"
						onChange={selectCheckbox}
						checked={isCheck.includes(row.id_pg)}
					/>
				</div>
				<div className="col-11">
				{row.name}
				</div>
			</div>
			);
		})}
		</>
    );  
}  
export default MyList

dangerouslySetInnerHTML is React’s replacement for using innerHTML in the browser DOM. In general, setting HTML from code is risky because it’s easy to inadvertently expose your users to a cross-site scripting (XSS) attack.

It is better/safer to sanitise your raw HTML (using e.g., DOMPurify) before injecting it into the DOM via dangerouslySetInnerHTML.

DOMPurify – a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify works with a secure default, but offers a lot of configurability and hooks.

import React from 'react'
import * as DOMPurify from 'dompurify';

const dropdownMenu = `
<div class="dropdown">
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-expanded="true">
    Dropdown
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Action</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Another action</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Something else here</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Separated link</a></li>
  </ul>
</div>
`

const YourComponent = props => {
  <div>
    { <div dangerouslySetInnerHTML={{ __html: DOMPurify.sanitize(dropdownMenu) }} /> }
  </div>
}
export default YourComponent;

If the HTML is coming from user input, make sure it is sanitized!

With a dynamic key-value array you can save all form values without needing to create a separate variable for each form element.

import React, { useEffect, useState } from 'react'

const Form = props => {
	const [state, setState] = React.useState({});
	function handleFieldChange(event) {
		setState({ ...state, [event.target.name]: event.target.value });
	}
    return (  
	<div className="form">
            <div className="row g-3 mb-3">
                <div className="col">
                    <input name="firstname" onChange={handleFieldChange} />
                </div>
                <div className="col">
                    <input name="email" onChange={handleFieldChange} />
                </div>
            </div>
            <div className="row g-3 mb-3">
                    <div className="col">
                        <textarea name="message" onChange={handleFieldChange}></textarea>
                </div>
            </div>
        </div>
    );  
}
export default Form