title: Disable input Textbox in Sweet Alert when use showLoaderOnConfirm
body: <p>I am using Sweet Alert plugin to create a button and create a popup to delete a something 
  I would like to disable textbox when the delete process is running, and i dont know how to do, anyone lead me?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>jQuery("#vbb_btn_delete_post").on("click", function(e) {
          swal({
              title: "Lý do xóa bài",
              type: "input",
              showCancelButton: true,
              closeOnConfirm: false,
              animation: "slide-from-top",
              inputPlaceholder: "Write something",
              showLoaderOnConfirm: true,
              customClass: "mySwall"
          },      
          function(inputValue){
              if (inputValue === false) return false;
              if (inputValue === "") {
                swal.showInputError("Bạn cần nhập lý do"); return false;   
              } 
              $('.mySwall').find(':text').prop('disabled', true); //it not working ???          
              jQuery.ajax({
                  url: "http://staging.webtretho.vn/forum/editpost.php?do=deletepost&amp;p={vb:raw postinfo.postid}",
                  type: "POST",
                  data: {
                      "dodelete": "1",
                      "deletepost": "delete",
                      "reason": inputValue,
                      "securitytoken": "{vb:raw bbuserinfo.securitytoken}",
                      "p": {vb:raw postinfo.postid},
                      "url": "{vb:raw url}",
                      "do": "deletepost",
                      "posid": {vb:raw postinfo.postid},
                      "forumid": {vb:raw $GLOBALS.forumid}
                  },
                  dataType: "html",
                  success: function () {
                      //console.log(data);
                      swal("Done!","It was succesfully deleted!","success");
                      window.location="http://staging.webtretho.vn/forum/f"+{vb:raw $GLOBALS.forumid};
                  }
              });
          //swal("Nice!", "You wrote: " + inputValue, "success");
          })
  });</code></pre>
  </div>
  </div>
  </p>