client/src/app/core/routing/can-deactivate-guard.service.ts


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import { Observable } from 'rxjs'
import { Injectable } from '@angular/core'
import { ConfirmService } from '@app/core/confirm'

export type CanComponentDeactivateResult = { text?: string, canDeactivate: Observable<boolean> | boolean }

export interface CanComponentDeactivate {
  canDeactivate: () => CanComponentDeactivateResult
}

@Injectable()
export class CanDeactivateGuard {

  constructor (private confirmService: ConfirmService) { }

  canDeactivate (component: CanComponentDeactivate) {
    const result = component.canDeactivate()
    const text = result.text || $localize`All unsaved data will be lost, are you sure you want to leave this page?`

    return result.canDeactivate || this.confirmService.confirm(
      text,
      $localize`Warning`
    )
  }

}