Force child to call parent method

Question

I have this situation:

abstract class A implements OnInit {
    ngOnInit() {
        this.abstractMethod();
    }

    abstract abstractMethod();
}

class B extends A implements OnInit {
    ngOnInit() {
        doOtherStuff();
    }
      
    abstractMethod() {
        doStuff();
    }
}

My problem is that B is not forced to call super.ngOnInit() inside it's ngOnInit method so abstractMethod is not called. Is there a way to force B to call super.ngOnInit()?

I'm asking this because I'm trying to create a base component for standard actions but some child components needs to do other things in ngOnInit (plus call abstractMethod()) and I'm trying to avoid mistakes caused by forgetfulness.

Answer 1

I had same problem. you can use this approach:

abstract class A implements OnInit {
    ngOnInit() {
        this.abstractMethod();
        this.childOnInit();
    }

    abstract abstractMethod();
    abstract childOnInit();
}

class B extends A {
    childOnInit() {
        doOtherStuff();
    }
      
    abstractMethod() {
        doStuff();
    }
}