# Titanium Angular Routing

Up to this point most of the Angular concepts are the same as in a normal Angular web application. This makes it possible to share a great part of you application logic within Angular regardless of whether your develop for the web or Titanium apps.

Starting with the application routing however, there are a few fundamental changes. How to setup and use routing in Titanium Angular will be described in detail here. If you haven't dealt with routing in Angular before, the Routing & Navigation (opens new window) guide is a great read.

# Setting up routing

If you followed our Titanium Angular Getting Started Guide and Titanium Angular Basics guides you noticed that until now everything revolved around the app.component.ts and app.component.html. Let's change that and move to multiple components and setup the routing for those.

First, open src/app/app.component.ts and copy its content to src/app/intro.component.ts. Do the same for src/app/app.component.html and copy it over to src/app/intro.component.html. Open intro.component.ts again and change the component name and its template to reflect those recent changes.

intro.component.ts

@Component({
    templateUrl: "./intro.component.html"
})
export class IntroComponent implements AfterViewInit, OnInit {
  ...
}

Now, open app.component.ts and replace it with an empty AppComponent.

import { Component } from '@angular/core';

@Component({
    selector: "ti-app",
    templateUrl: "./app.component.html"
})
export class AppComponent { }

After that, open app.component.html and replace its content with the Titanium router outlet directive.

app.component.html

<ti-router-outlet></ti-router-outlet>

This is the place where Angular will load the routed views.

To let Angular know which routes your application has, create another file named app-routing.module.ts and paste the following code into it.

import { NgModule } from '@angular/core';
import { Router, RouterModule, Routes } from '@angular/router';
import { TitaniumRouterModule } from 'titanium-angular';

import { IntroComponent } from './intro.component';

const appRoutes: Routes = [
    { path: '', redirectTo: '/intro', pathMatch: 'full' },
    { path: 'intro', component: IntroComponent }
];

@NgModule({
    imports: [TitaniumRouterModule.forRoot(appRoutes)],
    exports: [TitaniumRouterModule]
})
export class AppRoutingModule { }

This will setup a route for your previously created IntroComponent under the path /intro. It also instructs Angular to load this route upon the initial app launch by setting up a redirect for an empty path string.

Finally, open up the app.module.ts and add imports for the AppRoutingModule and IntroComponent, add the module to the imports and the component to the declarations of the AppModule configuration. Your app.module.ts should look like this afterwards:

import { NgModule, NO_ERRORS_SCHEMA } from '@angular/core';
import { TitaniumModule } from 'titanium-angular';

import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { HomeComponent } from './home.component';

@NgModule({
    imports: [
        TitaniumModule,
        AppRoutingModule
    ],
    declarations: [
        AppComponent,
        HomeComponent
    ],
    bootstrap: [AppComponent],
    schemas: [NO_ERRORS_SCHEMA]
})
export class AppModule { }

You can now build your app again and routing will be enabled. But the app won't be any different than before so let's change that and see the router in action.

# Adding another component

Now that routing is in place, it is time to add a new component and navigate to it using the Angular Router. Create src/app/home.component.ts and paste the following code.

home.component.ts

import { Component } from '@angular/core';

@Component({
    templateUrl: "./home.component.html"
})
export class HomeComponent {

}

Since we focus on the routing aspect here, we just use a very simple template. Create app/src/home.component.html and create the following user interface.

home.component.html

<Window backgroundColor="#fafafa">
    <Label>Hello World!</Label>
</Window>

Now you need to go back to your app-routing.module.ts and add a route for your newly created component.

import { NgModule } from '@angular/core';
import { Router, RouterModule, Routes } from '@angular/router';
import { TitaniumRouterModule } from 'titanium-angular';

import { IntroComponent } from './intro.component';
import { HomeComponent } from './home.component';

const appRoutes: Routes = [
    { path: '', redirectTo: '/intro', pathMatch: 'full' },
    { path: 'intro', component: IntroComponent },
    { path: 'home', component: HomeComponent }
];

@NgModule({
    imports: [TitaniumRouterModule.forRoot(appRoutes)],
    exports: [TitaniumRouterModule]
})
export class AppRoutingModule { }

After that, go to your app.module.ts and add the HomeComponent to the declarations property.

import { NgModule, NO_ERRORS_SCHEMA } from '@angular/core';
import { TitaniumModule } from 'titanium-angular';

import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { IntroComponent } from './intro.component';
import { HomeComponent } from 'home.component';

@NgModule({
    imports: [
        TitaniumModule,
        AppRoutingModule
    ],
    declarations: [
        AppComponent,
        IntroComponent,
        HomeComponent
    ],
    bootstrap: [AppComponent],
    schemas: [NO_ERRORS_SCHEMA]
})
export class AppModule { }

At this point the routing setup is done and Angular knows about your new component and its route. The last thing that is missing now is to actually trigger the navigation. Go back to the intro.component.html and change the Button element that is marked with the #demoButton identifier to the following.

<Button #demoButton title="Tap me!" tiRouterLink="/home" bottom="40" height="40" width="150" backgroundColor="#1976d2" color="white" borderRadius="20"></Button>

Note the usage of the tiRouterLink directive which is used to trigger the navigation to a new route. You can use this directive on all elements that support the click Event. If you need to trigger the navigation from your code, for example, the click event isn't available or you need to execute some other logic first, you can also navigate using the TitaniumRouter. For this you inject the router into your component and then call the navigate or navigateByUrl methods as demonstrated by the code below.

import { TitaniumRouter } from 'titanium-angular';

class ExampleComponent {
  constructor(private router: TitaniumRouter) { }

  openHome() {
    this.router.navigate(['home']).catch(e => Ti.API.error(e.message));
  }
}

These methods take the same parameters as navigate (opens new window) and navigateByUrl (opens new window) from the original Angular router.

Thats it! If you build the app again and tap on the button, it will now navigate to your second component.

# Appendix

# Additional information on routing

In some guides, the routing configuration is added directly into the app.module.ts along wit the import of the TitaniumRouter (or it's web equvalent). That way you don't need a specilal module only for routing. For simple apps that only have a handful of views, this is totally fine. But as your app grows, you will find it useful to split up routing configurations over different modules and seperate routing concers from other app concerns.

For more details in this topic make sure to read the extensive Angular Routing & Navigation (opens new window) guide. There you will learn more about routing modules or feature modules and how to organize your routing using those. This goes far beyond the goal of this simple getting started guide. If you want to see an example of all this applied to Titanium Angular check the ti-angular-example (opens new window) app.