角度2:从另一个组件调用现有组件 [英] Angular 2: Call existing component from another component
问题描述
我正在使用路由功能使用Angular 2创建一个应用程序,并且我有一个弹出组件,该组件由上一条较高的路线之一呈现,我想在呈现的组件中的click事件上将其打开通过其中一条更深的路线.
I'm creating an app with Angular 2 using the routing features, and I have a popup component that is rendered by one of the higher up routes, and I want to open it on a click event in a component that is rendered by one of the deeper routes.
例如,假设我有一个基本路由器,其模板包含弹出窗口:
For example, let's say I have a base router with a template containing the popup:
@Component({
selector: 'application',
template: '<router-outlet></router-outlet><popup-component></popup-component>',
directives: [PopupComponent]
})
@RouteConfig([
{ ... },
{ ... }
])
export class AppRoute { }
还有一个带有打开方法的简单弹出组件:
And a simple popup component with an open method:
@Component({
selector: 'popup-component',
template: '<div [class.show]="isVisible">This is a popup.</div>'
})
export class PopupComponent {
public isVisible: boolean = false;
show() {
this.isVisible = true;
}
}
如何在特定的PopupComponent上调用此show方法,该PopupComponent已由AppRoute从位于路由树中某处的另一个组件呈现出来了?
How can I call this show method on that specific PopupComponent that was already rendered by the AppRoute from another component that resides somewhere down in the routing tree?
我曾经尝试过使用依赖注入:
I have tried using dependency injection like this:
@Component({
selector: 'my-component',
template: '<button (click)="showPopup()"></button>'
})
export class MyComponent {
constructor(private popup: PopupComponent) { }
showPopup() {
this.popup.show();
}
}
但这只是创建一个PopupComponent的新实例,而该实例实际上尚未呈现.我该如何称呼由AppRoute呈现的那个?
But this just creates a new instance of the PopupComponent that isn't actually rendered yet. How can I call the one that is rendered by the AppRoute?
推荐答案
您需要共享服务
import {Injectable} from 'angular2/core';
import {Subject} from 'rxjs/Rx';
export class PopupService{
show:Subject<boolean> = new Subject();
}
将服务添加到AppRoute
@Component({
providers:[PopupService],
selector: 'application',
...
])
export class AppRoute { }
将服务注入popup-component
并订阅表演主题.
Inject the service to popup-component
and subscribe to the show subject.
@Component({
selector: 'popup-component',
template: '<div [class.show]="isVisible">This is a popup.</div>'
})
export class PopupComponent {
public isVisible: boolean = false;
constructor(private popup: PopupService) {
popup.show.subscribe( (val:boolean) => this.isVisible = val );
}
}
将其注入到要显示弹出窗口的任何组件中,在show
主题上调用next
;
Inject it to any component where you want to show the popup, call next
on the show
subject;
@Component({
selector: 'my-component',
template: '<button (click)="showPopup()"></button>'
})
export class MyComponent {
constructor(private popup: PopupService) { }
showPopup() {
this.popup.show.next(true);
}
}
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