gistfile1.txt

  // http://www.w3.org/TR/html5/association-of-controls-and-forms.html#concept-form-submit
  // FormData (to support files?) FormData.append... (only POST + not string result???)
  function serializeForm(form, submitter, useFormData) {
    useFormData = useFormData && window.FormData;
    var results = useFormData ? (new FormData()) : [], tagName, i, opts, j, field, elements = form.elements;
    for (j = 0; j < elements.length; j++) {
      field = elements[j];
      tagName = field.tagName.toLowerCase();
      if (tagName === 'object' || (tagName === 'input' && (field.type === 'image' || (!useFormData && field.type === 'file')))) {
        return null;
      }
      if (!(field.disabled ||
          !field.name ||
          (tagName === 'input' && field.type === 'reset') ||
          (tagName === 'input' && (field.type === 'checkbox' || field.type === 'radio') && !field.checked) ||
          (tagName === 'input' && (field.type === 'button' || field.type === 'submit') && field !== submitter) ||
          (tagName === 'button' && field !== submitter))) {
        
        if (field.type === 'file' && tagName === 'input') {
          for (i = 0; i < field.files.length; i++) {
            results.append(field.name, field.files[i]);
          }
        } else {
        
          opts = tagName === 'select' ? field.options : [{selected: 1, value: field.value}];
          for (i = 0; i < opts.length; i++) {
            if (opts[i].selected) {
              if (useFormData) {
                results.append(field.name, opts[i].value || '');
              } else {
                results.push(encodeURIComponent(field.name) + '=' + encodeURIComponent(opts[i].value || ''));
              }
            }
          }
        }
      }
    }
    return useFormData ? results : results.join('&');
  }