Using nested components in Angular 2: A guide

I recently delved into Angular 2 and encountered an issue while working with components. I am attempting to integrate the "NavigationComponent" component within the template of my "MyApp" component.

Here is the code for the "MyApp" component (/app/app.component.ts):

import { Component } from 'angular2/core';
import { RouteConfig, ROUTER_DIRECTIVES, ROUTER_PROVIDERS } from 'angular2/router';
import {NavigationComponent} from './navigation/navigation.component';

@Component({
    selector: 'my-app',
    templateUrl: 'app/app.component.html'
})
export class MyApp {
}

/app/app.component.html:

<nav class="pink accent-3" role="navigation">
    <na-navigation>Loading...</na-navigation> // <-- this is my unsuccessful attempt :(
</nav>
<footer class="page-footer">
    <!--footer-->
</footer>

/app/navigation/navigation.component.ts:

import { Component, OnInit } from 'angular2/core';
import { MenuItem } from './menuItem';

@Component({
  selector: 'na-navigation',
  templateUrl: 'app/navigation/navigation.component.html'
})
export class NavigationComponent implements OnInit {

  menuItems: MenuItem[] = [];

  ngOnInit() {
      this.menuItems.push(new MenuItem("Sign in", "signIn"));
      this.menuItems.push(new MenuItem("Create account", "createAccount"));
  }
}

/app/navigation/navigation.component.html:

<div class="nav-wrapper container">
    <a id="logo-container" href="#" class="brand-logo">Logo</a>
    <ul class="right hide-on-med-and-down">
        <li *ngFor="#menuItem of menuItems">
            <a>{{menuItem.label}}</a>
        </li>
    </ul>
</div>

Instead of rendering my tag, only "Loading..." appears on the screen rather than the menu list.

How can I properly inject "NavigationComponent" into "MyApp" so that it becomes available in the "app.component.html" template?

Answer №1

Make sure to include all components and directives used in your template within the directives: [] array.

@Component({
    selector: 'my-app',
    directives: [NavigationComponent],
    templateUrl: 'app/app.component.html'
})
export class MyApp {
}

If the components' code is in the same file, be cautious not to reference classes that come after their usage. In TypeScript, classes are not hoisted.

To avoid any issues, it's recommended to have one file for each class you define.

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