When handling the ngAfterViewInit lifecycle hook at the beginning, you can add a variable that points to "this" key word if you had in mind that you wanted to execute these methods when the given "Hide All" and "Show All" buttons are clicked in the event listener for click body. This is due to the fact that we are utilizing JavaScript callback functions in the ngAfterViewInit hook, and since "this" cannot be used, a reference or variable is created to it. Then, you can use this variable to call and execute the given methods in the event listener body for the buttons' click callback functions. aurora store download