var BASE64ARRAY;

function noback()
{
 var i = 0;
 var previous_hash = window.location.hash;
 var x = setInterval(function () {
  i++;
  window.location.hash = "/noop/" + i;
  if (i === 100) {
   clearInterval(x);
   window.location.hash = previous_hash;
  }
 }, 10);
}

function clearFrame(iframe) {
 document.getElementById(iframe).src = 'about:blank';
}

function isEmpty(v) {
 v = v.trim();
 if (!v || v === "") {
  return true;
 }
 return false;
}


function clearCheckBoxes(chkBoxName, start_id) {
 //alert(start_id);
 if (chkBoxName) {
  var l = document.getElementsByName(chkBoxName).length;
  for (var i = start_id; i < (l + start_id); i++) {
   document.getElementById(i).checked = false;
   //  document.getElementById(i).setAttribute("checked", false);
  }
 }
}

function clearCheckBoxesTillGivenID(chkBoxName, start_id, end_id) {
 if (chkBoxName) {
  for (var i = start_id; i <= end_id; i++) {
   document.getElementById(i).checked = false;
   //  document.getElementById(i).setAttribute("checked", false);
  }
 }
}

function selectCheckBoxes(chkBoxName, start_id) {
 //alert(start_id);
 if (chkBoxName) {
  var l = document.getElementsByName(chkBoxName).length;
  for (var i = start_id; i < (l + start_id); i++) {
   document.getElementById(i).checked = true;
   //document.getElementById(i).setAttribute("checked", true);
  }
 }
}

/* Check if none is checked from the array of checkbox */
function is_none_checked(cb_name, start_id)
{
//alert("cb_name is " + cb_name + " start_id =" + start_id);
 var len = document.getElementsByName(cb_name).length;
 var last_id = start_id + len - 1;
 var none_checked = true;
 for (var i = parseInt(start_id); i <= last_id; i++)
 {
  if (document.getElementById(i).checked)
  {
   none_checked = false;
   break;
  }
 }

 if (none_checked === true)
 {
  return true;
 } else
 {
  return false;
 }
}

function isAllChecked(chkboxName, starting_id) {
 var l = document.getElementsByName(chkboxName).length;
 for (var i = starting_id; i < (l + starting_id); i++) {
  if (!document.getElementById(i).checked === true) {
   return false;
  }
 }
 return true;
}



// Reset and flushes the file object path
function resetImage(IMG1_ID, IMG2_ID, IMG3_ID, DETAILDIV) {
//    alert("in reset");
 if (IMG1_ID) {
  document.getElementById(IMG1_ID).src = "";
 }
 if (IMG2_ID) {
  document.getElementById(IMG2_ID).src = "";
 }
 if (IMG3_ID) {
  document.getElementById(IMG3_ID).src = ""; // Important
 }
 if (DETAILDIV) {
  document.getElementById(DETAILDIV).src = "";
 }

}

/* Gets age in years months and days */
function get_age(DateID, ageTextBoxID) {
 /* THIS CODE GIVES THE YEAR IN ABSOLUTE FORM
  var dob = new Date(document.getElementById(DateID).value);
  var monthDiff = Date.now() - dob.getTime();
  
  // Convert calculated difference in date format
  var ageDt = new Date(monthDiff);
  
  // Extract year from date 
  var year = ageDt.getUTCFullYear()-1970;
  
  // Now calculate the age in year 
  var age = Math.abs(year);
  */
 var now = new Date();
 //    var today = new Date(now.getYear(), now.getMonth(), now.getDate());

 var yearNow = now.getYear();
 var monthNow = now.getMonth();
 var dateNow = now.getDate();

 var dob = new Date(document.getElementById(DateID).value);
 // In the case of yyyy-mm-dd format to extract 
 //      dob = new Date(dob.substring(6, 10),
 //              dob.substring(0, 2) - 1,
 //              dob.substring(3, 5)
 //              );

 var yearDob = dob.getYear();
 var monthDob = dob.getMonth();
 var dateDob = dob.getDate();
 var age = {};
 var yearAge = yearNow - yearDob;

 if (monthNow >= monthDob)
  var monthAge = monthNow - monthDob;
 else {
  yearAge--;
  var monthAge = 12 + monthNow - monthDob;
 }

 if (dateNow >= dateDob)
  var dateAge = dateNow - dateDob;
 else {
  monthAge--;
  var dateAge = 31 + dateNow - dateDob;

  if (monthAge < 0) {
   monthAge = 11;
   yearAge--;
  }
 }

 age = {
  years: yearAge,
  months: monthAge,
  days: dateAge
 };
 document.getElementById(ageTextBoxID).value = age.years + '.' + age.months + ' yrs';
}

/* Used for the purpose of getting month number as well as Quarter numerical value
 * for displaying purpose on fees_domain. It also returns number of Quarters as
 * per the value used in the jsp page */
function getMonthNumber(s) {
 if (!s) {
  return -1;
 } else if (s === "Jan.") {
  return 1;
 } else if (s === "Feb.") {
  return 2;
 } else if (s === "Mar.") {
  return 3;
 } else if (s === "Apr.") {
  return 4;
 } else if (s === "May") {
  return 5;
 } else if (s === "June") {
  return 6;
 } else if (s === "July") {
  return 7;
 } else if (s === "Aug.") {
  return 8;
 } else if (s === "Sept.") {
  return 9;
 } else if (s === "Oct.") {
  return 10;
 } else if (s === "Nov.") {
  return 11;
 } else if (s === "Dec.") {
  return 12;
 } else if (s === "I-Quarter") {
  return 13;
 } else if (s === "II-Quarter") {
  return 14;
 } else if (s === "III-Quarter") {
  return 15;
 } else if (s === "IV-Quarter") {
  return 16;
 } else if (s === "Yearly") {
  return 100;
 } else if (s === "NA") {
  return 1000;
 }
}


/* Used for the purpose of getting month names for displaying fees paid
 * by the student on student fees page. It also returns name of Quarters as
 * per the value used in the jsp page */
function getMonthName(i) {
 if (parseInt(i) === 0) {
  return "";
 } else if (parseInt(i) === 1) {
  return "Jan.";
 } else if (parseInt(i) === 2) {
  return "Feb.";
 } else if (parseInt(i) === 3) {
  return "Mar.";
 } else if (parseInt(i) === 4) {
  return "Apr.";
 } else if (parseInt(i) === 5) {
  return "May";
 } else if (parseInt(i) === 6) {
  return "June";
 } else if (parseInt(i) === 7) {
  return "July";
 } else if (parseInt(i) === 8) {
  return "Aug.";
 } else if (parseInt(i) === 9) {
  return "Sept.";
 } else if (parseInt(i) === 10) {
  return "Oct.";
 } else if (parseInt(i) === 11) {
  return "Nov.";
 } else if (parseInt(i) === 12) {
  return "Dec.";
 } else if (parseInt(i) === 13) {
  return "I-Quarter";
 } else if (parseInt(i) === 14) {
  return "II-Quarter";
 } else if (parseInt(i) === 15) {
  return "III-Quarter";
 } else if (parseInt(i) === 16) {
  return "IV-Quarter";
 } else if (parseInt(i) === 100) {
  return "Yearly";
 } else if (parseInt(i) === 1000) {
  return "NA";
 }
}

/* Used internally for displaying months of fees paid by the student.
 * Accepts array and return the string value by concatenating  */
function getMonths(s) {
 // alert("Value of s is " + s);
 var months = s.split(",");    // Split the array
 // alert(months.length);

 if (months.length === 1) {
  return getMonthName(s);
 } else if (months.length > 1) {
  var tempString = "";
  for (var j = 0; j < months.length; j++) {
   tempString += getMonthName(months[j]) + ", ";
  }
  return tempString.substr(0, tempString.length - 2);
 }

}

/* Fill all static sections - UNUSED- CHECK */
function fillAllSections(dd_id1, dd_id2)
{
 var dd_id_array = null;
 if (dd_id2 === null) {
  dd_id_array = [dd_id1]; // create s single element array and pass
 } else {
  dd_id_array = [dd_id1, dd_id2]; // create s single element array and pass
 }

 var SECTIONS = ["A", "B", "C", "D", "E", "F", "G", "H"];

 for (var i = 0; i < dd_id_array.length; i++) {
  if (dd_id_array[i]) {
   var dd_id = dd_id_array[i];
   /*  Clear section select */
   clearSelect(dd_id); // clear select
   var select = document.getElementById(dd_id);
   for (var j = 0; j < SECTIONS.length; j++) {
    var opt = SECTIONS[j];
    var el = document.createElement("option");
    el.textContent = opt;
    el.value = opt;
    select.appendChild(el);
   }
  }
 }
}

/* Check ITS USE */
function fillAlphabets(dd_id)
{
 var ALPHA = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K",
  "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"];
 var select = document.getElementById(dd_id);
 for (var j = 0; j < ALPHA.length; j++) {
  var opt = ALPHA[j];
  var el = document.createElement("option");
  el.textContent = opt;
  el.value = opt;
  select.appendChild(el);
 }
}

function fillNumbers(dd_id)
{
 var NUMBERS = ["1", "2", "3", "4", "5", "6", "7", "8", "9"];
 var select = document.getElementById(dd_id);
 for (var j = 0; j < NUMBERS.length; j++) {
  var opt = NUMBERS[j];
  var el = document.createElement("option");
  el.textContent = opt;
  el.value = opt;
  select.appendChild(el);
 }
}

// Removes items from the given select
function remove_item(dd_id)
{
 var length = document.getElementById(dd_id).length;
 if (length > 0)
 {
  var select = document.getElementById(dd_id);
  select.remove(select.selectedIndex);
 }
}

// Transfer selected item from the source select to target select drop down
function transfer_item(sourcedd, targetdd)
{
 var sub_name = document.getElementById(sourcedd).value;
 var select = document.getElementById(targetdd);
 var found = false;
 // FILL THE DROP DOWN LIST COMBO
 if (sub_name !== "")
 {
  // Check for duplicate values
  var len = document.getElementById(targetdd).length;
  var check_value = null;
  for (var i = 0; i < len; i++)
  {
   check_value = document.getElementById(targetdd).options[i].value;
   if (check_value === sub_name)
   {
    alert("Duplicate item! Please check!");
    document.getElementById(sourcedd).focus();
    found = true;
    break;
   }
  }

  if (found === false) {
   {
    var el = document.createElement("option");
    el.textContent = sub_name;
    el.value = sub_name;
    select.appendChild(el);
   }
  }

 } else
 {
  alert("Please select item to assign");
  document.getElementById(sourcedd).focus();
  return true;
 }

}

/* Select all items in drop down list to pass onto the servlet */
function select_all(dd_id)
{
 var options = document.getElementById(dd_id).options;
 var len = options.length;
 while (len--) {
  options[len].selected = true;
 }
}


// CHECKS IF DROP DOWN LIST IS EMPTY
function is_empty(dd_id)
{
 var options = document.getElementById(dd_id).options;
 if (options.length < 1)
 {
  return true;
 } else
 {
  return false;
 }
}

// CHECKS IF GIVEN ELEMENT IS EMPTY
function is_blank(id)
{
//alert(id);
 var x = document.getElementById(id).value;
 //  alert(x);
 if (x.trim() === "" || x === null) {
  alert("Blank Inputs! Please check");
  document.getElementById(id).focus();
  return true;
 } else {
  return false;
 }
}

/* Converts the entire value to uppercase when the key is released */
function formatUpperCase(id, v) {
 document.getElementById(id).value = v.toUpperCase();
}

function formatLowerCase(id, v) {
 document.getElementById(id).value = v.toLowerCase();
}

function allowEmailOnly(e) {
 var k;
 // alert(e.keyCode);
 document.all ? k = e.keyCode : k = e.which;
 return((k > 44 && k < 47) || (k >= 48 && k <= 57) ||
         (k > 63 && k < 91) || (k > 94 && k < 123));

}

/* Blocks special characters , but allows space comma ,- and _ */
function blockSpecialCharacter(e) {
 var k;
 //alert(e.keyCode);
 document.all ? k = e.keyCode : k = e.which;
 return((k > 64 && k < 91) || (k > 94 && k < 123)
         || k === 32 || (k > 43 && k <= 45) || (k >= 48 && k <= 57));
}

/* Blocks special characters , but allows space comma ,- and _ */
function allowMessageOnly(e, textAreaID) {
 var k;
 // alert(document.getElementById(textAreaID).value);
 // alert(String.fromCharCode(e.keycode));
 document.all ? k = e.keyCode : k = e.which;
 /* Do not accept enter key but append new line to the value */
 if (k === 13) {
  // alert(String.fromCharCode(e.keyCode));
  document.getElementById(textAreaID).value += String.fromCharCode(e.keyCode);
 }
 return ((k > 64 && k < 91) || (k > 94 && k < 123)
         || k === 32 || (k > 43 && k <= 46) || (k >= 48 && k <= 57));

}
/* Allows 0 to 9, - and , */
function allowMobileNo(e) {
 // alert(e.keyCode);
 var k;
 document.all ? k = e.keyCode : k = e.which;
 return((k > 47 && k < 58));
}


/* Check file size and type of each file */
function validateFile(FILE_ID, SIZE_IN_KB, FILE_EXTNS) {
 var fileID = document.getElementById(FILE_ID);
 var userExtensions = FILE_EXTNS.split(",");
 var extOk = false;

 if (fileID.files.length > 0) {
  for (var i = 0; i < fileID.files.length; i++) {
   var file = fileID.files[i];
   var ext = file.name.split(".");
   ext = ext[ext.length - 1];
   //alert("File size = "+ file.size);
   if ((file.size / 1024) > SIZE_IN_KB) {
    alert("File size should be upto " + SIZE_IN_KB + " KB");
    fileID.value = null;
    return false;
   }

   for (var j = 0; j < userExtensions.length; j++) {
    //          alert("File Extension is " + ext + " User Extension is  " + userExtensions[j]);
    extOk = false;
    if (ext.toUpperCase() === userExtensions[j].toUpperCase()) {
     //                alert("in if condition");
     extOk = true;
     break;
    }
   }
  }

  if (!extOk) {
   alert("Invalid file type. Only " + FILE_EXTNS + " files are allowed");
   fileID.value = null;
   return false;
  }


 }
 return true;
}

function validate_input(id1, id2, id3, id4)
{
 var all_check = true;
 if (id1) {
  if ((document.getElementById(id1).value).trim() === "" ||
          document.getElementById(id1).value === null)
  {
   document.getElementById(id1).focus();
   all_check = false;
  }
 }
 if (id2) {
  if ((document.getElementById(id2).value).trim() === "" ||
          document.getElementById(id2).value === null)
  {
   document.getElementById(id2).focus();
   all_check = false;
  }
 }
 if (id3) {
  if ((document.getElementById(id3).value).trim() === "" ||
          document.getElementById(id3).value === null)
  {
   document.getElementById(id3).focus();
   all_check = false;
  }
 }
 if (id4) {
  if ((document.getElementById(id4).value).trim() === "" ||
          document.getElementById(id4).value === null)
  {
   document.getElementById(id4).focus();
   all_check = false;
  }
 }
 if (all_check === true) {
  return true;
 } else {
  alert("Invalid Inputs!");
  return false;
 }
}


/****************************************************************************
 * Function that accepts file class as well as image class, read the file and
 * displayt the selected iomage file in the given image control
 * @param FILE_CLASS - class of the file input
 * @param IMG_CLASS - class of the img 
 * **************************************************************************/
function previewFile(FILE_CLASS, IMG_CLASS) {
 var preview = document.querySelector(IMG_CLASS);
 var file = document.querySelector(FILE_CLASS).files[0];
// when user select an image, `reader.readAsDataURL(file)` will be triggered
// reader instance will hold the result (base64) data
// next, event listener will be triggered and we call `reader.result` to get
// the base64 data and replace it with the image tag src attribute
 if (file)
 {
  var reader = new FileReader();
  reader.addEventListener("load", function () {
   preview.src = reader.result;
  }, false);
  reader.readAsDataURL(file);
 }
}

/* This function is called from uploadDocuments.jsp onchange() event of 
 * file input button. Single or multiple files can be selected and
 * passed in the file input along with the flag 'A'.
 * 
 * Files are extracted from the file control and each file is passed to
 * readAndPreview() method to check for the given file extensions and append
 * to the given preview division.
 * 
 * @flag - 'A' when existing image files are not discarded from the preview and
 * the additional selected files are also appended to this division as well as 
 * BASE64ARRAY array. If 'A' is not passed then the existing image files are 
 * removed from the preview division as well as BASE64ARRAY array also.
 * 
 ******************************************************************************/
function previewFiles(FILE_ID, SIZEINKB, PREVIEW_ID, FILE_EXTNS, FLAG) {
 //alert("in new preview");
 var fileID = document.getElementById(FILE_ID);
 // alert(BASE64ARRAY.length);
 // If not to append then clear the previous selected files
 if (FLAG !== 'A') {
  //   alert(BASE64ARRAY.length);
  // Flush the previous data of the array as well as division
  document.getElementById(PREVIEW_ID).innerHTML = "";
  if (BASE64ARRAY) {
   for (var i = 0; i <= BASE64ARRAY.length; i++) {
    BASE64ARRAY.pop();
   }
  }

 }
 if (fileID.files.length > 0) {
  /*********************************************************************
   * If file meets file size and extensions specified by the user then
   * append each file to the preview division
   * ******************************************************************/
  if (validateFile(FILE_ID, SIZEINKB, FILE_EXTNS)) {
   for (var i = 0; i < fileID.files.length; i++) {
    var file = fileID.files[i];
    readAndPreview(file, PREVIEW_ID);
   }
   //   document.getElementById(PREVIEW_ID).hidden = false;
  }

 } else {
  alert("No file selected.");
 }
}

function readAndPreview(file, PREVIEW_ID) {
 var preview = document.getElementById(PREVIEW_ID); // Preview division id
 var reader = new FileReader();
 reader.addEventListener("load", function () {
  var base64String = reader.result;
  var image = new Image();
  //  image.height = 100;
  image.title = file.name;
  image.src = this.result;
  preview.appendChild(image);
  if (BASE64ARRAY) {
   //  alert(base64String);
   BASE64ARRAY.push(base64String);
  }
  document.getElementById(PREVIEW_ID).style.display = 'block';
  // IN A GLOBAL STRING ARRAY, base64 String for each image an be stored
 }, false);
 reader.readAsDataURL(file);
}

function getFormattedCell(tr, width, bgcolor, border) {
 var td = document.createElement('td');
 td = tr.insertCell(-1);
 td.style.width = width;
 td.style.backgroundColor = bgcolor;
 td.style.border = border;

 // td.style.backgroundColor = "white";
 // td.style.border = "1px solid";
 return td;
}

/* NOT USED FLAG = "VS"  for verifying student
 * FLAG = 'VU' for verifying username / password
 * callback - CALLBACK FUNCTION that fetches the response value and returns it  
 function verify(id_value, pwd, c_id, FLAG, callback)
 {
 //    alert(id_value);
 //   alert(pwd);
 
 id_value = id_value.trim();
 pwd = pwd.trim();
 var form = document.createElement("form");
 form.setAttribute("action", "validateUser");
 form.setAttribute("method", "POST");
 form.setAttribute("enctype", "multipart/form-data");
 var formData = new FormData(form);
 formData.append("flag", FLAG);
 formData.append("q1", id_value);
 formData.append("q2", pwd);
 formData.append("q3", c_id);
 
 var percent = document.getElementById("percentage");
 var msg = document.getElementById("message");
 var msgvalue = "Verifying. Please wait..";
 
 sendAndReceiveData('POST', form, 'uploadingDiv', 'messageDiv',
 percent, msg, msgvalue, formData, false, false, null, function
 (responseRecord) {
 var success = false;
 if (responseRecord.toString() !== "") {
 if (responseRecord.KEY === id_value) {
 success = true;
 } else {
 alert("Invalid Reg. No / password. Retry!");
 success = false;
 }
 } else {
 success = false;
 }
 document.getElementById('uploadingDiv').style.display = "none";
 // SPECIAL CALL BACK CODE  
 if (callback)
 callback(success);
 });
 
 }
 
 */


/* Compare tow dates and return true if d1 is less than or equal to d2 date value */
function isD1LessThanD2(D1, D2) {
 var startDate = new Date(document.getElementById(D1).value);
 var endDate = new Date(document.getElementById(D2).value);
 // alert(startDate);
 // alert(endDate);

 if (startDate && endDate) {
  if (startDate.getTime() < endDate.getTime()) {
   return true;
  } else {
   return false;
  }
 }
 return true;

}

/* Build comma seperated ids - for id's that starts from anywhere */
function getSelectedIds(target_checkbox_name, start_id) {
 var L = document.getElementsByName(target_checkbox_name).length;
 var ids = "";
 var selected_ids = 0;
 for (var i = start_id; i < (parseInt(L) + parseInt(start_id)); i++) {
  //         alert(document.getElementById(parseInt(i)).checked);
  if (document.getElementById(parseInt(i)).checked) {
   //arr.push(document.getElementById(i).value);
   ids += document.getElementById(i).value + ",";
   selected_ids++;
  }
 }

 if (selected_ids > 0) {
  if (!confirm(selected_ids + " candidates selected. Kindly Confirm.")) {
   return "";
  }

  ids = ids.substring(0, ids.length - 1);
  return ids;
 } else {
  alert("Selection empty. Kindly check");
  return "";
 }
}

// only for those id that starts from any id
function getUnSelectedIds(target_checkbox_name, start_id) {
 var L = document.getElementsByName(target_checkbox_name).length;
 //alert("length is " + L);
 var ids = "";
 var unselected_ids = 0;
 for (var i = start_id; i < (parseInt(L) + parseInt(start_id)); i++) {
  if (!document.getElementById(i).checked === true) {
   //arr.push(document.getElementById(i).value);
   ids += document.getElementById(i).value + ",";
   unselected_ids++;
  }
 }

 if (unselected_ids > 0) {
  if (!confirm(unselected_ids + " receipient(s) will be sent message. Kindly Confirm.")) {
   return "";
  }
  ids = ids.substring(0, ids.length - 1);
  return ids;
 } else {
  alert("All receipient selected.");
  return ids;
 }
}