When you enter a number in the numeric box and click on the button, you perform a task in the child component that updates the operation value in the parent component. When you run the application, you'll get the following output: In the function, we are using the JavaScript method to find a product with a matched productId and then updating the stock count of the matched product. This.productToUpdate = (this.findProducts, ) We are passing the value to productId and stock using property binding (remember, these two properties are decorated with in StockStatusComponent) and using event binding to handle the stockValueChange event (remember, this event is decorated with in StockStatusComponent). Inside the column, the component is used. Modify AppComponent to Use StockStatusComponent So to emit an event from the child component class to the parent component class, use EventEmitter with the StockStatusComponent is using both and to read data from AppComponent and emit an event to AppComponent. In addition, we are using with EventEmitter to emit an event to AppComponent. So to pass data from the parent component class to the child component class, use decorator. Here we are using the decorator to read data from AppComponent class, which happens to be the parent class in this case. We are updating the value of the color property in the ngOnChanges() lifecycle hook because each time the stock value gets updated in the AppComponent, the value of the color property should be updated.In the stockValueChanged function, we are emitting the stockValueChange event and also passing the product id to be updated and the value to be added to the product stock value.This event will be emitted to AppComponent on the click of the button. We are creating an event called stockValueChange.We are creating two decorated properties - stock and productId - because the value of these two properties will be passed from AppComponent.The value of the color property is updated in the class. So, we must use property binding to set the background of the button. We need to set the color of the button on the basis of the value of product stock.On the click event of the button, an event is emitted to the AppComponent. We need to pass this value with an event to the AppComponent. In the template, there is one numeric input box which is bound to the updatedStockValue property using.In the first line, we are importing everything that's required: etc. ![]() Let's explore the above class line by line. Consider the AppChildComponent as shown below: import ) Both are parts of the by the jargon? Let's simplify it together. In Angular, a component can emit an event using EventEmitter.
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