This should work similar in Dart 
https://github.com/angular/angular/issues/4112#issuecomment-153811572

On Wednesday, August 10, 2016 at 7:53:24 AM UTC+2, Thomas Löffler wrote:
>
> Hello,
>
> I want to check a login before navigating to a component. In the TS 
> version there is the "AuthGuard"-Possibility, in Angular Dart there is a 
> @CanActivate annotation for the component.
>
> Unfortunately this decorator wants a anonymous function, completely 
> decoupled from the component and all injected services.
>
> My question is: How can I check things BEFORE the router navigates to a 
> component?
>
> I tried:
>
> 1. subscribing to the router change in the parent component -> 
> notifications are too late to intercept
> 2. use the OnActivate implementation in the component -> called AFTER 
> navigation
>
> How can I use the opposite of CanDeactivate properly to prevent or allow a 
> navigation to the component?
>
> Thanks.
>

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