如何在Angular 2中发出@Output事件

Question

使用Angular 2版本:2.0.0-alpha.44

我试图从组件发出输出信号.我在这里关注了Angular文档 .Below是我的组件的代码

@Component({
    selector: 'summary'
})
@View({
    directives: [NgFor, NgIf, ROUTER_DIRECTIVES, LogoutComponent, BarChartDirective, SunburstChartDirective],
    templateUrl: 'view/summary-component.html'
})
export class SummaryComponent {
    @Output() loadSummary: EventEmitter = new EventEmitter();
    project: Project;
    data: any;

    constructor(public http: Http,
            public router: Router,
            public xxxGlobalService: XXXGlobalService) {
        console.log("SummaryComponent: Created");
        this.getSummary()  
    }

    getSummary() {
        this.project = this.xxxGlobalService.getOpenedProject();
        var url = "/project_summary?username="+ this.xxxGlobalService.getUser().name + "&project_id=" + this.project.id;
        this.http.get(url)
                 .map(res => res.json())
                 .subscribe(
                     data => this.extractData(data),
                     err => this.logError(err),
                () => console.log('SummaryComponent: Successfully got the summary')
        );
    }

    extractData(data) {
        this.data = data;
        console.log("SummaryComponent: Emitting loadSummary event");
        this.loadSummary.next("event");
    }
}

但是,当我尝试分配EventEmitter(下面的行)时,我收到错误说"TypeError:router_1.EventEmitter不是函数"

@Output() loadSummary: EventEmitter = new EventEmitter();

我检查了链接并修改了线条

@Output() loadSummary: EventEmitter;

但loadSummary似乎始终未定义.如何发出输出信号？请帮忙

Answer 1

从 beta.0（也许更早）开始，EventEmitter现在是angular2/core.

使用以下命令发出事件emit()：

@Output() loadSummary: EventEmitter<any> = new EventEmitter();
...
this.loadSummary.emit("event");