//Required field cannot be left blank

function validateFormFields(myform, action)
{
  //TODO - enable again
  //with if (action == "CancelOperation") assign action and submit...
  if (action == "CancelOperation")
  {
    myform.act_req.value = action;
    setCookie('db_update', action, 180)
    myform.submit();
    return false;
  }
	
  //var theForm = document.forms[0]
  var foundError = false;
  var passwordA = "";

  //validate fields that were populated
  for(i=0; i<myform.elements.length; i++)
  {     
    var fieldValue = trim(myform.elements[i].value);
    var classValue = myform.elements[i].className;
    var errorElemID = myform.elements[i].id + "Failed";

    if (document.getElementById(errorElemID) == null)
      continue;
    document.getElementById(errorElemID).innerHTML = '' + "" + '';  //reset error message
    
    if ((myform.elements[i].type == "text") || (myform.elements[i].type == "textarea") || (myform.elements[i].type == "password"))
    {
      //check mandatory fields (with '*' in their class attribute)
      if (classValue.indexOf('*') != -1)
      {
        if (isEmpty(fieldValue))
        {
          document.getElementById(errorElemID).innerHTML = '' + "Required field cannot be left blank" + '';
          if (!foundError) myform.elements[i].focus()
          foundError = true;          
          continue;
        }
      }
      
      //check minimum size (a number in the class attribute)
      var minLength = removeNonDigits(classValue);
      if (!isEmpty(minLength))
      {
        if (fieldValue.length < minLength)
        {
          document.getElementById(errorElemID).innerHTML = '' + "Field must be at least " + minLength + " characters long" + '';
          if (!foundError) myform.elements[i].focus();
          foundError = true;          
          continue;        
        }
      }
      
      //now check specific formats like emails, passwords, phone numbers
      if (classValue.indexOf('_') != -1)
      {
        classValue = classValue.substring(0, classValue.indexOf('_'));
      }
      switch (classValue)
      {
        case "text":
          break;
        case "email":
          if (!isEmailValid(fieldValue))
          {
            document.getElementById(errorElemID).innerHTML = '' + "Email format is invalid. Please re-enter" + '';
            if (!foundError) myform.elements[i].focus()
            foundError = true;          
            continue;          
          }
          break;
        case "emailNotMandatory":
          if (!isEmpty(fieldValue) && !isEmailValid(fieldValue))
          {
            document.getElementById(errorElemID).innerHTML = '' + "Email format is invalid. Please re-enter" + '';
            if (!foundError) myform.elements[i].focus()
            foundError = true;          
            continue;          
          }
          break;
        case "passwordA":
          passwordA = fieldValue;        
          break;
        case "passwordB":
          if (passwordA != fieldValue)
          {
            document.getElementById(errorElemID).innerHTML = '' + "Passwords do not match" + '';
            if (!foundError) myform.elements[i].focus()
            foundError = true;          
            continue;             
          }
          break;
        default:
          break;               
      }      
    
    }
    if (myform.elements[i].type == "select-one")
    {
      if (myform.elements[i].options[myform.elements[i].selectedIndex].value == "")
      {
        document.getElementById(errorElemID).innerHTML = '' + "Please select from the drop down list" + '';
        if (!foundError) myform.elements[i].focus()
          foundError = true;          
          continue;
      }  
    }

  }
  
  //validate mandatory fields and check any custom rules
  switch (myform.name)
  {
    case "registration":
      break;
    default:
      break;  
  }
    /*if(theForm.elements[i].type == "checkbox"){
      alertText += "Element Checked? " + theForm.elements[i].checked + "\n"
    }*/

  // submit form if no error found
  if (!foundError)
  {
	myform.act_req.value = action;
	setCookie('db_update', action, 180)
	myform.submit();
  }

  return;
}

function isEmailValid(emailAddr)
{
 return emailAddr.match("^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$");
}

function removeNonDigits(textStr) {
  var tempStr = textStr + "";
  return tempStr.replace(/\D/g, "");
}

function trim(aTextString)
{
  return aTextString.replace(/^\s+|\s+$/g, '');
}

function isEmpty(aTextField) {
   if ((aTextField == null) || (aTextField.length == 0)) {
      return true;
   }
   else { return false; }
} 

function setCookie(cookieName, cookieValue, liveMin)
{
  var expireDate = new Date
  expireDate.setMinutes(expireDate.getMinutes()+liveMin)
  document.cookie = cookieName + "=" + cookieValue + ";expires=" + expireDate.toGMTString()
}

/**********************************************************
 *
 *           AJAX form validation
 *           
 **********************************************************/   

// holds an instance of XMLHttpRequest
var xmlHttp = createXmlHttpRequestObject();
// holds the remote server address 
var serverAddress = "./utilities/validate_forms.php";
// when set to true, display detailed error messages
var showErrors = true;
// initialize the validation requests cache 
var cache = new Array();

// creates an XMLHttpRequest instance
function createXmlHttpRequestObject() 
{
  // will store the reference to the XMLHttpRequest object
  var xmlHttp;
  // this should work for all browsers except IE6 and older
  try
  {
    // try to create XMLHttpRequest object
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    // assume IE6 or older
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
    // try every id until one works
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      { 
        // try to create XMLHttpRequest object
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {} // ignore potential error
    }
  }
  // return the created object or display an error message
  if (!xmlHttp)
    displayError("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}

// function that displays an error message
function displayError($message)
{
  // ignore errors if showErrors is false
  if (showErrors)
  {
    // turn error displaying Off
    showErrors = false;
    // display error message
     alert("Error encountered: \n" + $message);
    // retry validation after 10 seconds
    setTimeout("validate();", 10000);
  }
}

// the function handles the validation for any form field
function validate(inputValue, fieldID)
{
  return;  //disable AJAX form validation for now

  // only continue if xmlHttp isn't void
  if (xmlHttp)
  {
    // if we received non-null parameters, we add them to cache in the
    // form of the query string to be sent to the server for validation
    if (fieldID)
    {
      // encode values for safely adding them to an HTTP request query string
      inputValue = encodeURIComponent(inputValue);
      fieldID = encodeURIComponent(fieldID);
      // add the values to the queue
      cache.push("inputValue=" + inputValue + "&fieldID=" + fieldID);
    }
    // try to connect to the server
    try
    {
      // continue only if the XMLHttpRequest object isn't busy
      // and the cache is not empty
      if ((xmlHttp.readyState == 4 || xmlHttp.readyState == 0) 
         && cache.length > 0)
      {
        // get a new set of parameters from the cache
        var cacheEntry = cache.shift();
        // make a server request to validate the extracted data
        xmlHttp.open("POST", serverAddress, true);
        xmlHttp.setRequestHeader("Content-Type", 
                                 "application/x-www-form-urlencoded");
        xmlHttp.onreadystatechange = handleRequestStateChange;
        xmlHttp.send(cacheEntry);
      }
    }
    catch (e)
    {
      // display an error when failing to connect to the server
      displayError(e.toString());
    }
  }
}

// function that handles the HTTP response
function handleRequestStateChange() 
{
  // when readyState is 4, we read the server response
  if (xmlHttp.readyState == 4) 
  {
    // continue only if HTTP status is "OK"
    if (xmlHttp.status == 200) 
    {
      try
      {
        // read the response from the server
        readResponse();
      }
      catch(e)
       {
        // display error message
        displayError(e.toString());
      }
    }
    else
    {
      // display error message
      displayError(xmlHttp.statusText);
    }
  }
}

// read server's response 
function readResponse()
{
  // retrieve the server's response 
  var response = xmlHttp.responseText;
  // server error?
  if (response.indexOf("ERRNO") >= 0 
      || response.indexOf("error:") >= 0
      || response.length == 0)
    throw(response.length == 0 ? "Server error." : response);
  // get response in XML format (assume the response is valid XML)
  responseXml = xmlHttp.responseXML;
  // get the document element
  xmlDoc = responseXml.documentElement;
  result = xmlDoc.getElementsByTagName("result")[0].firstChild.data;
  fieldID = xmlDoc.getElementsByTagName("fieldid")[0].firstChild.data;
  if (result == "OK") result = "";
  // update the client display using the data received from the server
  document.getElementById(fieldID + "Failed").innerHTML = '' + result + '';
  // call validate() again, in case there are values left in the cache
  setTimeout("validate();", 500);
}

// sets focus on the first field of the form
function setFocus()    
{
  document.getElementById("txtUsername").focus();
}