69 lines
2.0 KiB
Dart
69 lines
2.0 KiB
Dart
library hello_world.index;
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import "package:angular2/bootstrap.dart" show bootstrap;
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import "package:angular2/core.dart"
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show ElementRef, Component, Directive, Injectable;
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import "package:angular2/render.dart" show Renderer;
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main() {
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// Bootstrapping only requires specifying a root component.
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// The boundary between the Angular application and the rest of the page is
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// the shadowDom of this root component.
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// The selector of the component passed in is used to find where to insert the
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// application.
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// You can use the light dom of the <hello-app> tag as temporary content (for
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// example 'Loading...') before the application is ready.
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bootstrap(HelloCmp);
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}
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// A service available to the Injector, used by the HelloCmp component.
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@Injectable()
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class GreetingService {
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String greeting = "hello";
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}
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// Directives are light-weight. They don't allow new
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// expression contexts (use @Component for those needs).
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@Directive(selector: "[red]")
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class RedDec {
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// ElementRef is always injectable and it wraps the element on which the
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// directive was found by the compiler.
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RedDec(ElementRef el, Renderer renderer) {
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renderer.setElementStyle(el, "color", "red");
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}
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}
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// Angular 2.0 supports 2 basic types of directives:
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// - Component - the basic building blocks of Angular 2.0 apps. Backed by
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// ShadowDom.(http://www.html5rocks.com/en/tutorials/webcomponents/shadowdom/)
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// - Directive - add behavior to existing elements.
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// @Component is AtScript syntax to annotate the HelloCmp class as an Angular
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// 2.0 component.
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@Component(
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selector: "hello-app",
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viewProviders: const [GreetingService],
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template:
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'''<div class="greeting">{{greeting}} <span red>world</span>!</div>
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<button class="changeButton" (click)="changeGreeting()">change greeting</button>''',
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directives: const [RedDec])
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class HelloCmp {
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String greeting;
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HelloCmp(GreetingService service) {
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this.greeting = service.greeting;
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}
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void changeGreeting() {
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this.greeting = "howdy";
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}
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}
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