// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
//
// Simple routines to quickly pick up obvious typos.
// All validation routines return true if executed by an older browser:
// in this case validation must be left to the server.
//
// Update Aug 2004: have tested that IE 5.0 and IE 5.5 both support DOM model
// sufficiently well, so innerHTML option removed (redundant).
//
// Update Jun 2005: discovered that reason IE wasn't setting focus was
// due to an IE timing bug. Added 0.1 sec delay to fix.
// ----------------------------------------------------------------------

var nbsp = 160;    // non-breaking space char
var node_text = 3; // DOM text node-type
var emptyString = /^\s*$/
var glb_vfld;      // retain vfld for timer thread

// -----------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// -----------------------------------------

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


// -----------------------------------------
//                  setfocus
// Delayed focus setting to get around IE bug
// -----------------------------------------

function setFocusDelayed(vfld)
{
  glb_vfld.focus()
}

function setfocus(vfld)
{
  glb_vfld = vfld;
  setTimeout( 'setFocusDelayed()', 100 );
}


// -----------------------------------------
//                  msg
// Display warn/error message in HTML element
// commonCheck routine must have previously been called
// -----------------------------------------

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
};


// -----------------------------------------
//            commonCheck
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// -----------------------------------------

var proceed = 2;  

function commonCheck    (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(ifld);
  if (!elem) {
  	alert("debug error, missing field:"+ifld);
  }
  if (!elem.firstChild)
    return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text)
    return true;  // ifld is wrong type of node  
	if (!vfld) {
  	alert("debug error, missing field:"+vfld+"("+ifld+")");		
	}
  if (emptyString.test(vfld.value)) {
    if (reqd) {
      msg (ifld, "error", "  ERROR: required");  
      setfocus(vfld);
      return false;
    }
    else {
      msg (ifld, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// -----------------------------------------
//            commonSelect
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if check box is ticked if required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// -----------------------------------------

var proceed = 2;  

function commonCheckSelect    (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(ifld);
  if (!elem) {
  	alert("debug error, missing field:"+ifld);
  }
  if (!elem.firstChild)
    return true;  // not available on this browser

  if (elem.firstChild.nodeType != 3)
    return true;  // ifld is wrong type of node  
    if (!vfld[vfld.selectedIndex]) {
  	alert("debug error, missing field:"+vfld);    	
    }
    if (reqd && vfld[vfld.selectedIndex].value == 0) {
      msg (ifld, "error", "  ERROR: Please select a value");  
      return false;
    }
    else {
      msg (ifld, "warn", "");   // OK
      return true;  
    }
 
  return proceed;
}

// -----------------------------------------
//            commonCheckBox
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if check box is ticked if required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// -----------------------------------------

var proceed = 2;  

function commonCheckbox    (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(ifld);
  if (!elem) {
  	alert("debug error, missing field:"+ifld);
  }
  if (!elem.firstChild)
    return true;  // not available on this browser

  if (elem.firstChild.nodeType != 3)
    return true;  // ifld is wrong type of node  

    if (reqd && vfld.checked != true) {
      msg (ifld, "error", "  ERROR: If you agree with this statement please check the box");  
      setfocus(vfld);
      return false;
    }
    else {
      msg (ifld, "warn", "");   // OK
      return true;  
    }
 
  return proceed;
}

// -----------------------------------------
//            commonRadio
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if a radio selection has been made
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// -----------------------------------------

var proceed = 2;  

function commonCheckradio    (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(ifld);
  if (!elem) {
  	alert("debug error, missing field:"+ifld);
  }
  if (!elem.firstChild)
    return true;  // not available on this browser
  if (elem.firstChild.nodeType != 3)
    return true;  // ifld is wrong type of node  
    var countcheck;
    countcheck=0;
	 if (!vfld) {
  		alert("debug error, missing field:"+vfld);
  	}
		var j=vfld.length; 
		for (i=0; i<j; i++){

			if(vfld[i].checked) {

				countcheck++;
			}
		}
	//	alert ("reqd"+reqd+"countcheck"+countcheck+"ifiedl"+ifld);
    if (reqd == true && countcheck==0) {
      msg (ifld, "error", "  ERROR: You must select an answer");  
      return false;
    } else {
      msg (ifld, "warn", "");   // OK
      return true;  
    }
 
  return proceed;
}


// -----------------------------------------
//            validateCheckbox
// Validate if checkbox has been checked
// Returns true if so 
// -----------------------------------------

function validateCheckbox(vfld,   // element to be validated
                         ifld )  // id of element to receive info/error msg
{
  var stat = commonCheckbox (vfld, ifld, true);
  if (stat != proceed) return stat;

  msg (ifld, "warn", "");  
  return true;
};
// -----------------------------------------
//            validateRadio
// Validate if radio has been clicked
// Returns true if so 
// -----------------------------------------

function validateRadio(vfld,   // element to be validated
                         ifld )  // id of element to receive info/error msg
{
  var stat = commonCheckradio (vfld, ifld, true);
  if (stat != proceed) return stat;

  msg (ifld, "warn", "");  
  return true;
};
// -----------------------------------------
//            validatePresent
// Validate if something has been entered
// Returns true if so 
// -----------------------------------------
// -----------------------------------------
//            validateSelectBox
// Validate if Select box has been changed
// Returns true if so 
// -----------------------------------------

function validateSelectBox(vfld,   // element to be validated
                         ifld )  // id of element to receive info/error msg
{
  var stat = commonCheckSelect (vfld, ifld, true);
  if (stat != proceed) return stat;

  msg (ifld, "warn", "");  
  return true;
};
// -----------------------------------------
//            validatePresent
// Validate if something has been entered
// Returns true if so 
// -----------------------------------------


function validatePresent(vfld,   // element to be validated
                         ifld )  // id of element to receive info/error msg
{
  var stat = commonCheck (vfld, ifld, true);
  if (stat != proceed) return stat;

  msg (ifld, "warn", "");  
  return true;
};

// -----------------------------------------
//               validateEmail
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
// -----------------------------------------

function validateEmail  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/
  if (!email.test(tfld)) {
    msg (ifld, "error", "  ERROR: not a valid e-mail address");
    setfocus(vfld);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/
  if (!email2.test(tfld)) 
    msg (ifld, "warn", "  Unusual e-mail address - check if correct");
  else
    msg (ifld, "warn", "");
  return true;
};


// -----------------------------------------
//            validateTelnr
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// Permits spaces, hyphens, brackets and leading +
// -----------------------------------------

function validateTelnr  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/
  if (!telnr.test(tfld)) {
    msg (ifld, "error", "  ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    setfocus(vfld);
    return false;
  }
  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (ifld, "error", "  ERROR: " + numdigits + " digits - too short");
    setfocus(vfld);
    return false;
  }

  if (numdigits>14)
    msg (ifld, "warn", numdigits + " digits - check if correct");
  else { 
    if (numdigits<10)
      msg (ifld, "warn", "  Only " + numdigits + " digits - check if correct");
    else
      msg (ifld, "warn", "");
  }
  return true;
};

// -----------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// -----------------------------------------

function validateAge    (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(tfld)) {
    msg (ifld, "error", "  ERROR: not a valid age");
    setfocus(vfld);
    return false;
  }

  if (tfld>=200) {
    msg (ifld, "error", "  ERROR: not a valid age");
    setfocus(vfld);
    return false;
  }

  if (tfld>110) msg (ifld, "warn", "Older than 110: check correct");
  else {
    if (tfld<7) msg (ifld, "warn", "Bit young for this, aren't you?");
    else        msg (ifld, "warn", "");
  }
  return true;
};
// -----------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// -----------------------------------------

function validatePassword    (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd,vfldp)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;
 	var invalid=" ";
  // if it contains spaces or quotes do not allow it
  if ((vfld.value.indexOf(invalid) > -1) || (vfldp.value.indexOf(invalid) > -1)) {
    msg (ifld, "error", "  ERROR: not a valid password please do not use spaces in your password");
    setfocus(vfld);
    return false;
  }
  if (vfld.value != vfldp.value && vfld.value != "" && vfldp.value != "") {
    msg (ifld, "error", "  ERROR: your passwords do not match please recheck");
    setfocus(vfld);
    return false;
  } else {
    msg (ifld, "warn", "");  	
  }
  return true;
};