Angular use modal dialog in canDeactivate Guard service for unsubmitted changes (Form dirty)

Question

In my Angular 4 application I have some components with a form, like this:

export class MyComponent implements OnInit, FormComponent {

  form: FormGroup;

          


        

Answer 1

Just expanding on the additional info provided by mitschmidt regarding click outside / escape button, this canDeactivate method works with Francesco Borzi's code. I just add the subscribe to onHide() inline in the function:

canDeactivate(component: FormComponent) {
        if (component.form.dirty) {
            const subject = new Subject<boolean>();

            const modal = this.modalService.show(ConfirmLeaveComponent, { 'class': 'modal-dialog-primary' });
            modal.content.subject = subject;

            this.modalService.onHide.subscribe(hide => {
                subject.next(false);
                return subject.asObservable();
            });

            return subject.asObservable();
        }

        return true;
    }