HTML form elements already provide for an “autofocus” attribute that will pull focus to an input field after it is rendered on the page. This is great for static pages; but, in my experience, using the autofocus attribute in an Angular 5 application can be a bit hit-and-miss. It will often work the first time that an input is rendered; but, it will then stop working even if that input is hidden and re-rendered. As such, I usually end-up creating an autofocus attribute directive that wraps the focus workflow in a timer. Encapsulating the autofocus in an attribute directive has the added benefit of being able to (somewhat) programmatically control which input receives focus.
Source: Creating An Input-Driven AutoFocus Directive In Angular 5.0.2
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