Template: You can either use the native change event or NgModel directive's ngModelChange.
<input type="checkbox" (change)="onNativeChange($event)"/>
or
<input type="checkbox" ngModel (ngModelChange)="onNgModelChange($event)"/>
TS:
onNativeChange(e) { // here e is a native event
if(e.target.checked){
// do something here
}
}
onNgModelChange(e) { // here e is a boolean, true if checked, otherwise false
if(e){
// do something here
}
}