Stable Class
What it does
Lifecycle hook that is called when any data-bound property of a directive changes.
How to use
.
@Component({selector: 'my-cmp', template: `...`}) class MyComponent implements OnChanges { @Input() prop: number; ngOnChanges(changes: SimpleChanges) { // changes.prop contains the old and the new value... } }
Class Overview
class OnChanges { ngOnChanges(changes: SimpleChanges) : void }
Class Description
ngOnChanges
is called right after the data-bound properties have been checked and before view and content children are checked if at least one of them has changed. The changes
parameter contains the changed properties.
Class Details
ngOnChanges(changes: SimpleChanges) : void
exported from @angular/core/index, defined in @angular/core/src/metadata/lifecycle_hooks.ts
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