title: ionic 2 + angular 2 : auto scroll to bottom of list / page / chat
body: <p>I'm trying to code a page with two segments "chat" and "content". I want that one "chat" segment the page auto-scroll to the bottom with no effect. The chat is a <code>&lt;ion-list&gt;</code> with several <code>&lt;ion-item&gt;</code>.</p>
  
  <pre><code>&lt;ion-list&gt;
  &lt;ion-item&gt; item 1 &lt;/ion-item&gt;
  &lt;ion-item&gt; item 2 &lt;/ion-item&gt;
  ....
  &lt;ion-item&gt; item 20 &lt;/ion-item&gt;
  &lt;ion-item&gt; item 21 &lt;/ion-item&gt; &lt;!-- user should see directly this item on bottom of the page --&gt;
  &lt;/ion-list&gt;
  </code></pre>
  
  <p>I'm using Javascript, not typescript, and I don't wan't to use jQuery.
  Thanks :)
  Plus, when I go to "content" segment and go back to "chat" I want to auto-scroll again the chat.</p>