Angular - Pass data to parent component

Question

I have in my parent component this:

 obj: any = { row1: [], row2: [], total: [], sumTotal: 0 };

I pass obj to child component :

Answer 1

Inside this child component i have another child component where i change values of array but its not changing on my parent object.

Data flow between parent and child components is not two-way in Angular. So the changes you make in a child component won't be reflected in the parent component.

You can use EventEmitter to emit events from child component to parent component.

Child component:

In your child component, declare an EventEmitter object.

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

Then use emit method from anywhere in the child component to send data to parent component.

// Update parent component data.
this.updateObjDataEvent.emit(obj);

Parent component:

In your parent component template, subscribe to this event:

Then in your parent component, create updateObj() method to handle data updates from child component.

updateObj(data) {
  // Do something.
}

In the updateObj() method, you can update your parent component's array object.