How can I stop the browser back button using JavaScript?

Question

I am doing an online quiz application in PHP. I want to restrict the user from going back in an exam.

I have tried the following script, but it stops my timer.

Answer 1

I had this problem with React (class component).

And I solved it easily:

componentDidMount() {
    window.addEventListener("popstate", e => {
        this.props.history.goForward();
    }
}

I've used HashRouter from react-router-dom.