我已经按照angular2的官方指南来学习angular2.当我使用angular2-alpha28时,一切顺利!当将angular2更改为alpha36时,它无法工作!它显示以下错误:
EXCEPTION: Error during instantiation of Token(Promise<ComponentRef>)!.
angular2.dev.js:22746 ORIGINAL EXCEPTION: TypeError: Cannot read property 'toString' of undefined
angular2.dev.js:22746 ORIGINAL STACKTRACE:
angular2.dev.js:22746 TypeError: Cannot read property 'toString' of undefined
at new InvalidBindingError (angular2.dev.js:9171)
at _resolveBindings (angular2.dev.js:27377)
at Function.execute.Injector.resolve (angular2.dev.js:28030)
at Function.execute.DirectiveBinding.createFromBinding (angular2.dev.js:28611)
at Function.execute.DirectiveBinding.createFromType (angular2.dev.js:28643)
at execute.Compiler._bindDirective (angular2.dev.js:29892)
at execute.Compiler.compileInHost (angular2.dev.js:29908)
at execute.DynamicComponentLoader.loadAsRoot (angular2.dev.js:17421)
at angular2.dev.js:30555
at Injector.execute.Injector._instantiate (angular2.dev.js:27893)
这是我的ts代码:
/// <reference path="typings/angular2/angular2.d.ts" />
import { Component, View, bootstrap, NgFor, NgIf, Inject, forwardRef} from 'angular2/angular2';
@Component({
selector: "my-app",
bindings: [FriendsService]
})
@View({
template: `<h1>Hello {{ name }}</h1>
<p>Friends:</p>
<ul>
<li *ng-for="#name of names">{{ name }}</li>
</ul>
<p *ng-if="names.length > 3">Has many friends!</p>
<input #myname (keyup)>
<p>{{myname.value}}</p>
<input #nametext>
<button (click)="addName(nametext.value)">Add Name</button>
`,
directives: [NgFor, NgIf]
})
//Component controller
class MyAppComponent {
name: string;
names: Array<string>;
constructor(@Inject(forwardRef( () => FriendsService )) friendsService: FriendsService) {
this.name = 'Alice';
this.names = friendsService.names;
}
addName(name: string) {
this.names.push(name);
}
doneTyping($event) {
if($event.which === 13) {
this.addName($event.target.value);
$event.target.value = null;
}
}
}
class FriendsService {
names: Array<string>;
constructor() {
this.names = ["Alice", "Aarav", "Martin", "Shannon", "Ariana", "Kai"];
}
}
bootstrap(MyAppComponent,[FriendsService]);
和HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Angular 2 Quickstart</title>
<script src="https://github.jspm.io/jmcriffey/bower-traceur-runtime@0.0.87/traceur-runtime.js"></script>
<script src="https://jspm.io/system@0.16.js"></script>
<script src="https://code.angularjs.org/2.0.0-alpha.36/angular2.dev.js"></script>
</head>
<body>
<my-app></my-app>
<script>System.import('app');</script>
</body>
</html>
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