What does #id in input tag mean?

Question

From this Angular.io tutorial, I show:

where I do not unde

Answer 1

A template reference is used to give your controlling class a reference to an element. #searchBox will give you a reference to your input element if you define it in typescript like:

@ViewChild('searchBox') searchBox;

now you can use that reference to control or ask from your input element like:

this.searchBox.nativeElement.focus();