title: D3.js: get text of selected dropdown option?
body: <p>I have a Dropdown Select like this and would like to retrieve the Text of the selected option using D3.js</p>
  
  <pre><code>&lt;select id = "dropdown"&gt;
     &lt;option value = "Activity1"&gt;Watch TV&lt; /option&gt;
     &lt;option value = "Activity2"&gt;Sleep&lt;/option&gt;
     &lt;option value = "Activity3"&gt;Study&lt;/option&gt;
  &lt;/select&gt;"
  </code></pre>
  
  <p>I can get the value of my selection by using :
  var ActivityNumber = d3.select("#dropdown").property("value") ;</p>
  
  <p>However i am am needing needing help to retrieve the text of the selection.
   - Either "Watching TV" or "Sleep" or "Study" based on the browser selection.. </p>
  
  <p>Thank you in advance..  </p>