gistfile1.js

        function state_set(state) {
          var form = $('#panda-ajax-uploader');
          var file = $('#panda-upload-file');
          var button = $('#panda-upload-button');
          var box = $('#panda-progress-box');
          var bar = $('#panda-progress-bar');
          var status = $('#panda-progress-status');

          $('#panda-progress-box').removeClass();
          switch (state) {
            case 'begin':
              file.show();
              button.attr('disabled', 'disabled').show();
              box.hide();
              var msg = '<p>Please choose a file to upload.</p>';
              if (options.allowed_filetype != '*') {
                msg += '<p>Allowed filetype are <em>' +
                       options.allowed_filetype.join(', ') +
                       '</em></p>';
              }

              statusSet('status', msg);
              break;
            case 'start_upload':
              file.hide();
              button.hide();
              box.show();
              statusSet('status', 'Uploading: 0%');
              break;
            case 'upload_success':
              clearInterval(window.pandaTimer);
              barWidth('100%');
              file.hide();
              button.hide();
              statusSet('status', 'Uploaded <em>' + $('#panda-upload-file').val() + '</em> success.');
              var filename = file.val();
              try {
                file.remove();
                options.upload_success(id, filename);
              }
              catch (err) {
                // Nothing
              }
              break;
            case 'upload_error':
              clearInterval(window.pandaTimer);
              state_set('begin');
              statusSet('error', 'Something error, Please try again.');
              break;
            default:
              break;
          }
        }