Angular2: How to find out what was previous page url when using angular2 routing [duplicate]

Answer 1

You can do this with document.referrer

if(document.referrer !== '/myapp/signup'){
    location.back()
}

Answer 2

You can maybe leverage the OnActivate phase with the routerOnActivate method that gives you access to the previous url and the current one.

routerOnActivate(next: ComponentInstruction, prev: ComponentInstruction) {
  console.log(`Finished navigating from "${prev ? prev.urlPath : 'null'}" to "${next.urlPath}"`);
}