OnInit - Angular - W3cubDocs

A lifecycle hook that is called after Angular has initialized all data-bound properties of a directive. Define an ngOnInit() method to handle any additional initialization tasks.

API

interface OnInit {
  ngOnInit(): void;
}

ngOnInit

void

A callback method that is invoked immediately after the default change detector has checked the directive's data-bound properties for the first time, and before any of the view or content children have been checked. It is invoked only once when the directive is instantiated.

@returnsvoid

Usage Notes

The following snippet shows how a component can implement this interface to define its own initialization method.

@Component({
        selector: 'my-cmp',
        template: `...`,
      })
      class MyComponent implements OnInit {
        ngOnInit() {
          // ...
        }
      }