Implement two-way data binding for custom property

Question

I see in primeng components the use something like ngModel (two-way data binding) style for some property like this

[(selection)]=\"selectedItem\";
<         


        

Answer 1

In your child component (component-a) you need an @output

@Output() change:EventEmitter = new EventEmitter();

and then you notify parent component about a changed value by

change.emit(newValue);

See also Angular2: https://stackoverflow.com/a/33220997/3710630