当子组件位于路由器出口Angular中时，从子组件调用父组件函数

Question

I need to update some data in parent component by calling a function in it after an event has occurred in the child component. Here my child components are in router outlet of parent

parentComponent.html:-

<div class="row">
     Parent component
</div>
<router-outlet></router-outlet>

Parentcomponent.ts:-

fetchRequestsStatus(role, user) {
if (this.userRole) {
  this.dashboardService.getStatusCount(role, user).subscribe(
    res => {
      console.log(res)
    },
    err => {
      console.log(err)
    })
}

}

Now on a button click in the child, I need to call function fetchRequestsStatus(role, user) by passing a parameter from the child. I have seen @input @ output decorators for sharing data but here my child component is inside the router.

How can I proceed with this?

Answer 1

If you're thinking something like

<router-outlet (onButtonClick)="fetchRequestsStatus($events)"></router-outlet>

it's invalid as the child component you're thinking is a child component is actually a sibling component at runtime.

I am guessing this is your app component. So, you can have a subject in the app.service which can be an observer for the child and an observable for the parent.

Answer 2

The cleanest solution would be to create a shared service between the parent and child component, service that holds an Subject used by parent and child component.

Refer to this answer for code sample: https://stackoverflow.com/a/41989983/5620535

Make sure you use the new providedIn: 'root' angular feature to make sure the service is only instantiated once. (singleton)