Angular2 Get router params outside of router-outlet

Question

I have a dashboard application which consists of a treeview component (which lists various content nodes) and a dashboard-edit component which renders some editable content

Answer 1

Is it only possible to access route params in a component rendered by a router-outlet?

Yes, the tells Angular2 to treat the containing component as a "routing" component. Therefore you cannot get a RouteParams instance injected into the class as it wasn't instantiated via the routing directive.

If not, then what am I doing wrong?

I wouldn't say you're doing anything wrong, you simply had a misconception on how it was designed. I too has this initial misconception. I found this Angular2 article to be a great source for understanding how to pass data around and how to communicate betwixt parent and child components.

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In your specific case I'd suggest removing the RouteParams from the constructor of the ContentTreeComponent as it will only be available if rendered from a "routing" component.

export class ContentTreeComponent implements OnInit {

    constructor(
        private _contentService: ContentService,
        private _router: Router
    ) { }

    // Omitted for brevity...
}

Then in order to get the id, you'd probably have to share a bit more of your top-level code so that I can see where it is coming from...