typescript Angular：将组件传递给组件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/43933783/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Angular: Pass Component to a Component
提问by Draftsman
I have this small gridComponent:
我有这个小 gridComponent：
@Component({
selector: 'moving-grid',
templateUrl: './grid.component.html',
styleUrls: ['./grid.component.css']
})
export class GridComponent {
@Input('widgets') extComponents: Array<Component>;
}
And a second testComponent
和第二个 testComponent
@Component({
selector: 'test',
template: `
<div #content>I say hello<li>i</li><li>u</li><button (click)="test()">click me</button> world</div>
`
})
export class TestComponent {
@ViewChild('content') content: HTMLElement;
getContent() {
return this.content;
}
test() {
console.log("test");
}
}
Now I'm trying to pass multiple instances of testComponent to the gridComponent. Therefore I have a third Component which looks like this one:
现在我试图将 testComponent 的多个实例传递给 gridComponent。因此，我有第三个组件，如下所示：
template: `
<moving-grid [widgets]="[z1,z2]">
<test class="grid-item-content-001" #z1></test>
<test class="grid-item-content-002" #z2></test>
</moving-grid>
`
Until this point, everything works like expected. But how can I render the Components from @Input in the gridComponent? My first approach was to declare a @ViewChild in the testComponent and return it with a getContent()-function. But it won't work. Can I use the ng-content directive in some way or is there a better solution?
到目前为止，一切都按预期进行。但是如何从 gridComponent 中的 @Input 渲染组件？我的第一种方法是在 testComponent 中声明一个 @ViewChild 并使用 getContent() 函数返回它。但它不会工作。我可以以某种方式使用 ng-content 指令还是有更好的解决方案？
The GridComponent looks like this. I want to display the templates of a @Input-Component inside one of the black boxes. Is it possible?
GridComponent 看起来像这样。我想在其中一个黑框内显示 @Input-Component 的模板。是否可以？
Thanks for any kind of help
感谢您的任何帮助
回答by Poul Kruijt
You should not use an @Inputto pass in the components. You can use @ContentChildrenfor that and an abstract WidgetComponent:
您不应该使用 an@Input来传递组件。你可以使用@ContentChildren它和一个摘要WidgetComponent：
@Component({
selector: 'moving-grid',
template: `
<div class="widget-wrapper">
<ng-container *ngFor="let widget of widgets">
<!-- use a ngSwitchCase here for different types-->
<grid-test-widget [widget]="widget" *ngIf="widget.active && widget.type === 'test'"></grid-widget>
</ng-container>
</div>
`,
styleUrls: ['./grid.component.css']
})
export class GridComponent implements AfterContentInit {
@ContentChildren('widget') widgets: WidgetComponent[];
ngAfterContentInit() {
//your components will be available here
}
}
The template of your third component will stay the same, but without the [widgets]and an added #widgetname:
第三个组件的模板将保持不变，但没有[widgets]和 添加的#widget名称：
<moving-grid>
<test-widget class="grid-item-content-001" #widget [active]="false"></test>
<test-widget class="grid-item-content-002" #widget></test>
</moving-grid>
Your TestWidgetComponentwhich will extend an abstract WidgetComponent :
您的TestWidgetComponent这将扩展一个抽象的 WidgetComponent ：
@Directive({
selector: 'test-widget'
})
export class TestWidgetComponent extends WidgetComponent {
public type: string = 'test';
}
And your WidgetComponent:
还有你的WidgetComponent：
@Injectable()
export class WidgetComponent {
@Input()
public active: boolean;
public type: string;
}
And you'll have several grid widgets based on the type of the widget:
您将拥有多个基于小部件类型的网格小部件：
@Component({
selector: 'grid-test-widget',
template: `<div #content>I say hello<li>i</li><li>u</li><button (click)="test()">click me</button> world</div>`
})
export class GridTestWidgetComponent{}
