This allows us to control different routes, data and the components that render the data as well as many additional features. Sorry it's quite complex to post to StackBlitz. Ideally, the app would launch with just the AppModule and the HeroesModule loaded and then, almost immediately, load the CrisisCenterModule in the background. Hero feature route configuration Create a new heroes-routing. The existing AuthGuard already has the essential logic in its checkLogin method to support the CanLoad guard. There are several examples over the next few sections. Both buttons navigate back to the Crisis Center and its list of crises.
ActivatedRoute A service that is provided to each route component that contains route specific information such as route parameters, static data, resolve data, global query params, and the global fragment. The guard can also tell the router to navigate elsewhere, effectively canceling the current navigation. The Crisis Detail route is a child of the Crisis List. Either configure routes in the Routing Module or within the module itself but not in both. I've also seen some bizarre behavior from just doing debugging alert 'test' statements completely screwing up the 'flow' - so watch out for that too.
Stick with the default unless you have a compelling reason to resort to hash routes. Shortly, you'll extend the AdminDashboardComponent to inject this service and display its preloadedModules array. Optional parameters are the ideal vehicle for conveying arbitrarily complex information during navigation. By organizing the application into modules— AppModule, HeroesModule, AdminModule and CrisisCenterModule—you have natural candidates for lazy loading. The admin feature file structure looks like this: manage-heroes. Fortunately, you have another way to demonstrate an asynchronous router hook. Example: The following Navigates to the Detail route from child route Conclusion In this tutorial, we looked at various ways you can navigate between Angular routes, using the Angular router.
In our SpeakersComponent template, we are going to do essentially the same thing but instead of one router outlet, we will use two. Clearing secondary routes As you've learned, a component in an outlet persists until you navigate away to a new component. Unfortunately, ngOnInit is only called once per component instantiation. If you list AppRoutingModule first, the wildcard route will be registered before the hero routes. In our case, when we go to the speakers route, we want to map our list outlet to the speakerList path and our bio outlet to have a path of none which evaluates to a speaker id of none. You must add a to the app's index. But the guard doesn't have to know that.
You can go up to higher levels in the navigation using something like this: Go! Remove the HeroListComponent from the AppModule's declarations because it's now provided by the HeroesModule. You haven't made a mistake in the configuration. The user must click one of the links to trigger a navigation and display a component. If your app had many feature areas, the app component trees might look like this: Child routing component Add the following crisis-center. Give it a loadChildren property not a children property! The router throws an error if you don't. You can't block while waiting for the server—that's not possible in a browser.
Search criteria are often loosely structured, e. Now that we have our AppRoutingModule, we need to import it in our AppModule to enable it. The params emits new id values when the user navigates to the component. Route parameter: Required or optional? This approach makes the guard reusable. It's also logged to the browser's console. At some point you'll reach a tipping point where the application takes long time to load.
And within our SpeakersListComponent, we will call router. Now import the AuthGuard into the AppRoutingModule and add the AuthGuard to the canLoad array for the admin route. If you have not imported AppRoutingModule in AppModule during module generation you need to import it manually, otherwise, it will raise an error while you serve the application. The angular injector will automatically inject an instance of the Router service when an instance of EmployeeComponent is created. Instead, this article focuses on what Angular router does at runtime, after the router configuration has been loaded. The route to HeroDetailComponent has a twist. Each click navigated imperatively to the HeroDetailComponent with the next or previous id.
You still might delay navigation until the save succeeds. These are concerns at the top level of the application itself. Within the speakers route, we want to be able to display a list of speakers and the bio for the currently selected speaker. Quick workaround that im not proud of is to use window: window. Instead, it asks the user to make that choice explicitly in a confirmation dialog box that waits asynchronously for the user's answer. Once all resolvers have completed, their return values are merged in the route's data property and Angular router continues to step 6. Finally, re-export the Angular RouterModule by adding it to the module exports array.
We recommend moving the routing information into a special-purpose module called a Routing Module. Milestone 3: Heroes feature You've seen how to navigate using the RouterLink directive. Add an animations array to the Component metadata's that contains the slideInDownAnimation. Instead, I would get an error about the Url Matcher not being able to make a match. You can combine relative navigation syntax with an ancestor path. The idea behind is to be able to compose the pages via routes configuration. Router Navigate So far this has been a fairly straightforward exercise in the universe matching up with what we expect to see.