title: onclick of button show toastr only once and group the error messages in toastr
body: <p>i am using toastr jquery plugin. below is the link</p>
  
  <p><a href="https://github.com/scottoffen/jquery.toaster" rel="nofollow noreferrer">https://github.com/scottoffen/jquery.toaster</a></p>
  
  <p>i am facing 2 issues here</p>
  
  <ol>
  <li><p>Currently Multiple notifications displayed on click of button (please refer attached image)</p>
  
  <p><strong>Expected:</strong> it should show one notification each time of click, if notification exist do not show another one.</p>
  
  <ol start="2">
  <li>Way to group multiple notifications </li>
  </ol>
  
  <p><strong>Expected:</strong> Group Name and password together as a single notification</p></li>
  </ol>
  
  <p>Code</p>
  
  <pre><code>$(".actions").on("click", ".startWorkflowD", function() {
  
      //Disable Start workflow button
      $('.startWorkflowD').attr('disabled', 'disabled');
  
      var userDisplayName = $("#HEADER_USER_MENU_POPUP_text").text().toLowerCase();
      var actualUserDisplayName = $("#name").val().toLowerCase();
  
      if (userDisplayName != actualUserDisplayName) {
          $.toaster({
              priority: 'warning',
              title: 'Authentication Failed',
              message: '&lt;br/&gt;' + 'Please enter valid Name (First name and Last name), to start the workflow.'
          });
  
          //Enable start workflow button
          $('.startWorkflowD').removeAttr("disabled");
  
          return;
      }
  
      var password = $("#Password");
  
      if (password.val().length == 0) {
          // password is empty
          $.toaster({
              priority: 'warning',
              title: 'Authentication Failed',
              message: '&lt;br/&gt;' + 'Please enter valid Password, to start the workflow.'
          });
  
          //Enable start workflow button
          $('.startWorkflowD').removeAttr("disabled");
      }
  
  });
  </code></pre>
  
  <p><strong>Any help is appreciated</strong> </p>
  
  <p>i tried below stackoverflow answer, my toastr does not have <code>**"preventDuplicates": true,**</code> in options</p>
  
  <p><a href="https://stackoverflow.com/questions/32310210/toastr-jquery-must-only-show-once/32310679">toastr (jquery) must only show once</a></p>
  
  <p><a href="https://i.stack.imgur.com/BrseF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BrseF.jpg" alt="multiple tostr"></a></p>