title: Get form value from Sonata Admin
body: <p>I would like get value from form of Sonata Admin, but in source html i have for example:</p>
  
  <pre><code>&lt;input type="text" class="span5" maxlength="255" required="required" name="s215268450cfc7[username]" id="s215268450cfc7_username"&gt;
  </code></pre>
  
  <p><strong>s215268450cfc7</strong> this is uniqid, but for what this is add to all fields in form? This is regenerate after refresh page. </p>
  
  <p>I would like get value from this form, but i can't use:</p>
  
  <pre><code>$('#s215268450cfc7_username').val()
  </code></pre>
  
  <p>because this is still renames.</p>