title: How to get a text area value in an Angular2 component with material design lite?
body: <p>I have a materiel design lite page with :</p>
  
  <pre><code>&lt;div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label"&gt;
              &lt;textarea name="categoryName" class="mdl-textfield__input" type="text" id="textAddCategory"&gt;&lt;/textarea&gt;
              &lt;label class="mdl-textfield__label" for="textAddCategory"&gt;categoryName&lt;/label&gt;
          &lt;/div&gt;
  </code></pre>
  
  <p>I am wondering how I could get the text area value in my component ...
  Any Idea ?</p>