title: How to prevent jQuery Droppable from accepting certain Draggable?
body: <p>I'm creating a page with "groups" of droppable widgets, and each draggable can only be dropped on one group of droppables.</p>
  
  <p>I was able to achieve this by the following code:</p>
  
  <pre><code>$("div.droppable").droppable({
      //accept: ".draggable",
      accept: function (draggable) {
          if ($(this).attr("question_id") != null) {
              if ($(this).attr("question_id") == draggable.attr("question_id")) return true;
          }
          return false;
      });
  </code></pre>
  
  <p>However, now I'm having a little trouble. After dropping, I was not able to move the draggable around droppables in the same group as I could before. I could drop it on a droppable once, move it to another, but I couldn't move it back to the first droppable.</p>
  
  <p>Does anyone know what could have happened? Any input would be appreciated.</p>