title: Autocomplete functionality for textarea in angular 4
body: <p>I am working on chatting application. so here I am doing <code>@</code> functionality for text area means, while clicking <code>@</code> button or writing <code>@</code> one autocomplete list should open. That will contain username for a tag. I have got an idea in jQuery but I want to do in Angular.</p>
  
  <p>So far I am not able to do like this in Angular; if anybody has an idea, please share with me.</p>