子组件的Angular 4访问子

Question

I'm using ngx-charts line chart component which has a timeline inside. So the structure go like this : MyComponent -> LineChartComponent -> TimelineComponent.

(where LineChartComponent is the component from the library)

Having a reference to LineChartComponent is it possible to execute something like @ViewChild() on this reference to access the TimelineComponent ?

Answer 1

If it's projected, you can use @ContentChild() , otherwise you need LineChartComponent to make it available.

The better approach would be to use a shared service that you provide at MyComponent and inject to MyComponent and TimelineComponent and use like a message bus to communicate between these two components for example using Observables.

See also https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service