title: Disable a button dynamically created
body: <p>I have a button created in ajax event (I call some data and I create a button at the end).</p>
  
  <p>How do I disable it?</p>
  
  <p>I try:</p>
  
  <pre><code>$(document).on("click", ".sendLead", function(event) {
      $(".sendLead").disabled = true;
      some code...
  </code></pre>
  
  <p>but it does not work !</p>
  
  <p>Any idea ?</p>