In my last blog I have explained about @Input decorator to pass data from parent component to the child component. @Output is on other hand used in response to some event within a child component to receive some information for the parent component through some events. If you are not read my previous blog , I would suggest you to read the same. I have used the same example here also.
Modifying the child component
Next I am going to pass some data to the parent through the same productCardClick() method in the child component. In order to do that first you have to add a new property of type EventEmitter and emit the data you want to pass in to the parent component through this property like below .
Let’s go the parent component named ProductListComponent
In the parent component (ProductListComponent) you can see I have receiver method named onProductCardClickHandled(data:any) with a parameter to receive the data from the child component and I am calling this receiver method with a parameter via the @Output decorated property onProductCardClick inside the child component. Now when you click the button you will receive the child component data in to the parent component