formdata2querystring - input type을 queryString

/*
* Copyright 2005 Matthew Eernisse (mde@fleegix.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Original code by Matthew Eernisse (mde@fleegix.org)
* Additional bugfixes by Mark Pruett (mark.pruett@comcast.net)
*
*/

// The var docForm should be a reference to a <form>

function formData2QueryString(docForm) {

  var submitContent = '';
var formElem;
var lastElemName = '';

for (i = 0; i < docForm.elements.length; i++) {
  
   formElem = docForm.elements[i];
   switch (formElem.type) {
     // Text fields, hidden form elements
     case 'text':
     case 'hidden':
     case 'password':
     case 'textarea':
     case 'select-one':
       submitContent += formElem.name + '=' + escape(formElem.value) + '&'
       break;
      
     // Radio buttons
     case 'radio':
       if (formElem.checked) {
         submitContent += formElem.name + '=' + escape(formElem.value) + '&'
       }
       break;
      
     // Checkboxes
     case 'checkbox':
       if (formElem.checked) {
         // Continuing multiple, same-name checkboxes
         if (formElem.name == lastElemName) {
           // Strip of end ampersand if there is one
           if (submitContent.lastIndexOf('&') == submitContent.length-1) {
             submitContent = submitContent.substr(0, submitContent.length - 1);
           }
           // Append value as comma-delimited string
           submitContent += ',' + escape(formElem.value);
         }
         else {
           submitContent += formElem.name + '=' + escape(formElem.value);
         }
         submitContent += '&';
         lastElemName = formElem.name;
       }
       break;
      
   }
}
// Remove trailing separator
submitContent = submitContent.substr(0, submitContent.length - 1);
return submitContent;
}