如何在Angular4中实现ngFor回调？

Question

I know that there are several questions about this point. I have a table and for each row I've a button to show row's details with a modal, so I need to call a function to initialize these buttons when ngFor has finished to render them. This external function will add listeners "onClick" to every button to open modal, sadly I can't edit this external function anyway.

Answer 1

ngFor is synchounous, so as soon as the ngForOf array is updated during the ngDoCheck lifecycle it will render all items. So you can safely use ngAfterViewChecked in the parent component to perform your logic. When this lifecycle hook is triggered ngFor has added items to the DOM.