Blocking App Access on Multiple Browser Tabs in React JS for Fresh JavaScript Developers

I’m assuming you want to prevent users from accessing certain apps on multiple browser tabs in a React JS application. To achieve this, we can utilize localStorage to store the state of the app access and prevent users from opening the app in multiple tabs.

Here’s a step-by-step tutorial on how to block app access on multiple browser tabs using React JS:

Step 1: Create a React JS project
First, create a new React JS project using the create-react-app tool. Open your terminal and run the following command:

npx create-react-app block-app-access
cd block-app-access

Step 2: Install react-router-dom
Next, install react-router-dom to set up routing in our React application. Run the following command in your terminal:

npm install react-router-dom

Step 3: Create App components
In the "src" folder of your React project, create a new file called App.js. Add the following code to create a basic React component:

import React from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';

const App = () => {
  return (
    <div className="App">
      <Router>
        <Switch>
          {/* Add your routes here */}
          {/* Example: <Route exact path="/" component={Home} /> */}
        </Switch>
      </Router>
    </div>
  );
}

export default App;

Step 4: Implement app access blocking
Now, let’s implement the logic to block app access on multiple browser tabs. We will use localStorage to store a flag indicating whether the app is already open in another tab. Add the following code to App.js:

import React, { useEffect } from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';

const App = () => {
  useEffect(() => {
    if (localStorage.getItem('appOpenInAnotherTab')) {
      alert('App is already open in another tab!');
      window.close();
    } else {
      localStorage.setItem('appOpenInAnotherTab', 'true');
    }
  }, []);

  return (
    <div className="App">
      <Router>
        <Switch>
          {/* Add your routes here */}
          {/* Example: <Route exact path="/" component={Home} /> */}
        </Switch>
      </Router>
    </div>
  );
}

export default App;

Step 5: Test your application
Now, run your React application using the following command:

npm start

Open your application in one tab, and then try to open it in another tab. You should see an alert message indicating that the app is already open in another tab, and the second tab will be closed.

That’s it! You’ve successfully blocked app access on multiple browser tabs in a React JS application. Feel free to customize the logic further to suit your specific requirements. Happy coding!