/*
 * 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;
}

function makeRequest() {
  //var xmlHttpRequest = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
    xmlHttpRequest = new XMLHttpRequest();
    if (xmlHttpRequest.overrideMimeType) {
      xmlHttpRequest.overrideMimeType('text/xml');
      // See note below about this line
    }
  } else if (window.ActiveXObject) { // IE
    try {
      xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e) {}
    }
  }
  
  return (xmlHttpRequest ? xmlHttpRequest : false);
}

/*
 * Function  - xmlHttpPost
 * Parameter - docForm: form name 
 *           - strResultFunc: javascript function name to be execute after response has been received
 *           - retType: response return type, 1:XML output, else text output
 */
function xmlHttpPost(docForm, strResultFunc, retType) {
  /* ADDED BY SIMON ON 20071022 */
  var oSrchMsg = document.getElementById("msg_searching");
  if (oSrchMsg) {
    oSrchMsg.style.left = (document.body.scrollWidth/2 - 96) + "px";
    oSrchMsg.style.top = (document.body.scrollHeight/2 - 32) + "px";
    oSrchMsg.style.display = "";
  }
  /* END */
  
  var xmlHttpReq = makeRequest();
  if (xmlHttpReq) {
    xmlHttpReq.open('POST', docForm.action, true);
    //xmlHttpReq.setRequestHeader('Content-Type: multipart/form-data');
    xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlHttpReq.onreadystatechange = function() {
      //loading program code places here (if require)
      if (xmlHttpReq.readyState == 4) {
        if (xmlHttpReq.status == 200) {
          if (oSrchMsg) oSrchMsg.style.display = "none"; // ADDED BY SIMON ON 20071022
          eval(strResultFunc + (retType ? '(xmlHttpReq.responseXML);' : '(xmlHttpReq.responseText);'));
        }
      }
    }
    xmlHttpReq.send(formData2QueryString(docForm));
  }
  return false;
}


/*
 * Function  - xmlHttpPostData
 * Parameter - queryString: query string
 *           - formAction: file to receive data
 *           - strResultFunc: javascript function name to be execute after response has been received
 *           - retType: response return type, 1:XML output, else text output
 */
function xmlHttpPostData(queryString, formAction, strResultFunc, retType) {
  /* ADDED BY SIMON ON 20071022 */
  var oSrchMsg = document.getElementById("msg_searching");
  if (oSrchMsg) {
    oSrchMsg.style.left = (document.body.scrollWidth/2 - 96) + "px";
    oSrchMsg.style.top = (document.body.scrollHeight/2 - 32) + "px";
    oSrchMsg.style.display = "";
  }
  /* END */

  var xmlHttpReq = makeRequest();
  if (xmlHttpReq) {
    xmlHttpReq.open('POST', formAction, true);
    //xmlHttpReq.setRequestHeader('Content-Type: multipart/form-data');
    xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlHttpReq.onreadystatechange = function() {
      //loading program code places here (if require)
      if (xmlHttpReq.readyState == 4) {
        if (xmlHttpReq.status == 200) {
         if (oSrchMsg) oSrchMsg.style.display = "none"; // ADDED BY SIMON ON 20071022
          eval(strResultFunc + (retType ? '(xmlHttpReq.responseXML);' : '(xmlHttpReq.responseText);'));
        }
      }
    }
    xmlHttpReq.send(queryString);
  }
  return false;
}