title: How to access an external element inside a polymerjs element
body: <p>How to access an external element inside a polymerjs element.</p>
  
  <pre><code>&lt;polymer-element attributes="externalDropZoneContainerId"&gt;&gt;
  &lt;script&gt;
      Polymer('file-upload', {
          ready: function(){
              //Here I want to access the externalDropZoneContainerId so that I can bind drag and drop functionality to this ID
              //$('#' + externalDropZoneContainerId) does not work.
          }
      })
  &lt;/script&gt;
  &lt;polymer-element&gt;
  </code></pre>