title: Get an ID value as a string from a webview
body: <p>I would like to know how I can get a value from a webview.
  For example, to load a value into the webview I use:</p>
  
  <pre><code>myWebView.loadUrl("www.example.com");
  myWebView.loadUrl("javascript:document.getElementById('username').value='"+ user + "';");
  </code></pre>
  
  <p>Now I would like to read some text from a certain ID from a webpage.
  Something like:</p>
  
  <pre><code>myWebView.loadUrl("www.example.com");
  myWebView.getUrl("javascript:document.getElementById('username').toString(user);");
  </code></pre>
  
  <p>Is this possible?</p>