Angular2: How to prevent/ nullify history manipulation while implementing routerCanDeactivate?

Question

routerCanDeactivate() successfully prevents navigation away from component.

routerCanDeactivate(nextInstruction: ComponentInstruction, prevInstructi         


        

Answer 1

Due to window.onpopstate triggering at every back button click,

I thought that a pushState will be required. But that wasn't the case, and following code works perfectly.

routerCanDeactivate(nextInstruction: ComponentInstruction, prevInstruction: ComponentInstruction) {
    if(confirm("Do you want to discard unsaved changes ?")){
      return true;
    }
    else {
      history.forward();
      return false;
    }
  }

But it would be nice if somebody could explain what is happening because I don't have much knowledge of history api.