title: Angular2 make textarea press enter without new line added
body: <p>I have a textarea for some text input.
  When user finish typing, I let them use [Enter] to confirm the text by</p>
  
  <pre><code>&lt;textarea #msgInput (keyup.enter)="confirmText(msgInput.value)" &gt;
  &lt;/textarea&gt;
  </code></pre>
  
  <p>Although i can successfully get the text inside confirmText().
  A newline is created on the value of the textarea.</p>
  
  <p>How do I drop the new-line char to the textarea correctly?
  I know there exist some method like return 0 and preventDefault() when writing js but I have no idea how to do it in Angular2 typescript.</p>