OnInit

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.

interface OnInit {
  ngOnInit(): void
}

See also

• AfterContentInit

• Lifecycle Hooks guide

Methods

ngOnInit()
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.
ngOnInit(): void Parameters There are no parameters. Returns void

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() {
    // ...
  }
}