I'm new to angular, I want stop the routing when user clicks on refresh button or back button based on some condition. I don't know whether this is possible, if anybody knows help me

constructor(private route: Router) {
    this.route.events
        .filter(event => event instanceof NavigationEnd)
        .pairwise().subscribe((event) => {
            if (expression === true){
                // stop routing 
            } else {
                // continue routing
            }      
        });
}

Can it be possible? If yes, how can I do this?