// formChecker v1.6.0 (June 7, 2007) by Bramus! 
// http://www.bram.us/
//
// License : don't use, nor modify without Bramus! his permission.
//
// Checking routines based upon http://juicystudio.com/article/generic-form-validation.php/
//
// v 1.6.0 - Tuesday, June 7, 2007
//			- FEATURE 	: added _isColor
//
// v 1.5.1 - Tuesday, June 5, 2007
//			- CHANGE	: Added check to see if formChecker doesn't exist yet, to avoid conflicts if multiple includes are made.
//
// v 1.5.0 - Wednesday, February 7, 2007
//			- CHANGE	: Dateverification no longer depends on _my_ datepicker, since frequencydecoder his implementation 
// 						  is way more flexible and dynamic than mine
//			- CHANGE	: Due to the change above, the date validation needed to be real now (and not just checking on a string).
// 						  Implementation modded from http://www.codetoad.com/forum/17_10053.asp
//
// v 1.4.2 - Wednesday, November 29, 2006
//			- FEATURE	: added isUrl (http & ftp & https only)
//
// v 1.4.1 - Wednesday, August 23, 20006
//			- BUGFIX	: Minor bugfix in _isDate
//
// v 1.4 - Monday, August 7, 2006
//			- FEATURE 	: checkForm now shows and errormessage into an element with id=error_{nameofthefield}, if it is found. (backdrop from iedereenleeftmee)
//			- FEATURE	: possibility to make fields optional by adding optional to the class of the element
//			- CHANGE	: instead of selecting all children from the form by calling objForm.getElementsByTagName('*'),
//						  now only the following elements are selected: input, textarea, select
//
// v 1.3 - Monday, July 31, 2006
//			- CHANGE 	: greatly tweaked checkBox & radio checking (complete overhaul)
//
// v 1.2 - Somewhere in June 2006
//			- FEATURE 	: checkBox & radio checking
//
// v 1.1 - Somewhere in Q1 2006
//			- FEATURE 	: added isDate
//
// v 1.0 - Somewhere Q3 2005
//			- first version
//
// some stuff one needs to read before sinning against Exodus 20.15 (*)!
// - to validate a checkbox, you must place it in a label and give the label lbl_$item as id
//
// (*) See http://www.biblegateway.com/passage/?search=exodus%2020.15&version=31 for more details on Exodus 20.15 ;)

if (!formChecker) {

	var formChecker = {
	
		okColor			: '#ffffff',									// background to set when value is ok (textfield, textarea, select)
		nokColor		: '#ea9b9b',	/* '#ea9b9b', */				// background to set when value is not ok	
		okTextColor		: '#000000',									// background to set when value is ok (checkbox/radiobutton)
		nokTextColor	: '#ea9b9b',	/* '#CF2639', */				// background to set when value is not ok (checkbox/radiobutton)
		nokMessage		: 'Gelieve alle verplichte velden in te vullen',		// message to alert when form not ok, leave empty to not alert any message
		
		errorMsgSelect	: 'Please select a value',						// message to show on screen when select not ok
		errorMsgCheck	: 'Please make a choice',						// message to show on screen when checkbox/radiobutton not ok
		errorMsgString	: 'Please complete this field',					// message to show on screen when a textfield is empty
		errorMsgNumber	: 'Please enter a number',						// message to show on screen when no number was entered
		errorMsgEmail	: 'Please enter a valid e-mailaddress',			// message to show on screen when no e-mail was entered
		errorMsgUrl		: 'Please enter a valid url',					// message to show on screen when no url was entered
		errorMsgDate	: 'Please choose a date',						// message to show on screen when no date was selected
		errorMsgColor	: 'Please enter a hex color',					// message to show on screen when no date was selected
	
		checkForm		: function (daForm) {						
							var arClass, bValid, gotError;		  
							var objForm= daForm;
											
							//var objField	= objForm.getElementsByTagName('*');	// old method : got ALL items (including labels and such)		
							var objField 	= formChecker._mergeNodeLists(
													objForm.getElementsByTagName('input'), 
													objForm.getElementsByTagName('textarea'), 
													objForm.getElementsByTagName('select')
											   ); 
							
							gotError = false;
							
							document.getElementById('formSubmit').disabled		= true;
							if (document.getElementById('spinner')) {
								document.getElementById('spinner').style.visibility	= 'visible';
							}
							
							for (var iFieldCounter=0; iFieldCounter<objField.length; iFieldCounter++) {
							
								// Allow for multiple values being assigned to the class attribute
								arClass = objField[iFieldCounter].className.split(' ');
								
								for (var iClassCounter=0; iClassCounter<arClass.length; iClassCounter++) {
									
									// console.debug("checking item '%s' with class '%s'", objField[iFieldCounter].name, arClass[iClassCounter]);
								
									switch (arClass[iClassCounter]) {
									
										case 'select':		      	
											bValid 		= formChecker._isSelected(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgSelect;
											break;
										case 'check':		      	
											bValid 		= formChecker._isChecked(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgCheck
											break;
										case 'string':
											bValid 		= formChecker._isString(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgString;
											break;
										case 'number' :
											bValid 		= formChecker._isNumber(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgNumber;
											break;
										case 'url' :
											bValid 		= formChecker._isUrl(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgUrl;
											break;
										case 'email' :
											bValid 		= formChecker._isEmail(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgEmail;
											break;
										case 'date' :
											bValid 		= formChecker._isDate(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgDate;
											break;
										case 'colour' :
										case 'color' :
											bValid 		= formChecker._isColor(objField[iFieldCounter]);
											errorMsg	= formChecker.errorMsgColor;
											break;
										default:
											bValid = 'NULL';
											break;
										
									}
						
									if (bValid == false) {
						
										gotError = true;
										
										// date : color the label
										if(arClass[iClassCounter] == 'check') {
											var elems = document.getElementsByName(objField[iFieldCounter].name);
											for (var i=0; i<elems.length; i++) {
												document.getElementById('lbl_' + elems[i].id).style.color = formChecker.nokTextColor;
											}
										// normal : color the item
										} else {
											//objField[iFieldCounter].focus();
											objField[iFieldCounter].style.background = formChecker.nokColor;
										}
									
										// set errorMessage	
										if (document.getElementById("error_" + objField[iFieldCounter].name)) {
											document.getElementById("error_" + objField[iFieldCounter].name).innerHTML			= errorMsg;
											document.getElementById("error_" + objField[iFieldCounter].name).style.visibility	= 'visible';
										}
										
									} else {
										
										if (bValid != 'NULL') {		
											// date : color the label
											if(arClass[iClassCounter] == 'check') {
												var elems = document.getElementsByName(objField[iFieldCounter].name);
												for (var i=0; i<elems.length; i++) {
													document.getElementById('lbl_' + elems[i].id).style.color = formChecker.okTextColor;
												}
											// normal : color the item
											} else {
												//objField[iFieldCounter].focus();
												objField[iFieldCounter].style.background = formChecker.okColor;
											}
											
											// unset errorMessage									
											if (document.getElementById("error_" + objField[iFieldCounter].name)) {
												document.getElementById("error_" + objField[iFieldCounter].name).innerHTML			= '';
												document.getElementById("error_" + objField[iFieldCounter].name).style.visibility	= 'hidden';
											}
										}	
										
									}
								}
							}
							
							if (gotError) {
								if (formChecker.nokMessage != '') {
									alert(formChecker.nokMessage);
								}
								document.getElementById('formSubmit').disabled		= false;
								document.getElementById('spinner').style.visibility	= 'hidden';
								return false;
							} else {
								return true;
							}
						
		},
		
		_mergeNodeLists		: function (objInput, objTextarea, objSelect) {
		
								var objField = new Array();
								
								if (objInput.length != 0) {
									for (i = 0; i < objInput.length; i++) {
										objField[i]	= objInput.item(i);	
									}
								}
								
								if (objTextarea.length != 0) {
									for (i = 0; i < objTextarea.length; i++) {
										objField[objInput.length + i]	= objTextarea.item(i);	
									}
								}
								
								if (objSelect.length != 0) {
									for (i = 0; i < objSelect.length; i++) {
										objField[objInput.length + objTextarea.length + i]	= objSelect.item(i);	
									}
								}	
								
								return objField;
		},
		
		_isOptional			: function(className) {
								//alert(className);
								var re = new RegExp("optional");
								var m = re.exec(className);
								if (m == null) {
									return false;
								} else {
									return true;
								}
		},
			
		_isSelected			: function (objField) {
								if (formChecker._isOptional(objField.className) && (objField.selectedIndex == 0)) {
									return true;
								} else {
									if (objField.selectedIndex == 0) {
										return false;
									} else {
										return true;
									}
								}
		},
		
		_isChecked			: function (objField) {
								var arrOptions = document.getElementsByName(objField.name);
								for (var i=0; i<arrOptions.length; i++) {
									if (arrOptions[i].checked) return true;
								}
								return false;
		},
			
		_isString			: function (objField) {
								strValue	= objField.value.replace(/^\s*|\s*$/g, '');
								if (formChecker._isOptional(objField.className) && (strValue == "")) {
									return true;
								} else {
									return (typeof strValue == 'string' && strValue != ''); //  && isNaN(strValue)
								}
		},
			
		_isNumber			: function (objField) {
								strValue	= objField.value;
								if (formChecker._isOptional(objField.className) && (strValue == "")) {
									return true;
								} else {
									return (!isNaN(strValue) && strValue != '');
								}
		},
			
		_isEmail			: function (objField) {
								strValue	= objField.value;
								if (formChecker._isOptional(objField.className) && (strValue == "")) {
									return true;
								} else {
									var objRE = /^[\w-\.\']{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,}$/;
									return (strValue != '' && objRE.test(strValue));
								}
		},
		
		_isUrl				: function (objField) {	
								strValue	= objField.value;
								if (formChecker._isOptional(objField.className) && (strValue == "")) {
									return true;
								} else {
									var regexp = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/
									return regexp.test(strValue);
								}	
		},
		
		_isDate				: function (objField) {
								strValue	= objField.value;
								if (formChecker._isOptional(objField.className) && (strValue == "")) {
									return true;
								} else {
									//return !isNaN(new Date(strValue));		// <<--- this needs checking
									//return !isNaN(Date.parse(strValue));		// <<--- this needs checking -->> only works with / as divider
									
									var dateStr		= strValue;
									var datePat 	= /^(\d{4})(\/|-)(\d{1,2})(\/|-)(\d{1,2})$/; // (YYYY-MM-DD) or (YYYY/MM/DD)
									var matchArray 	= dateStr.match(datePat); // is the format ok?
									
									if (matchArray == null) {
										return false;
									}
									
									year 	= matchArray[1]; // parse date into variables
									month 	= matchArray[3];
									day 	= matchArray[5];
									
									if (month < 1 || month > 12) { // check month range
										// alert("Month must be between 1 and 12.");
										return false;
									}
									
									if (day < 1 || day > 31) {
										// alert("Day must be between 1 and 31.");
										return false;
									}
									
									if ((month==4 || month==6 || month==9 || month==11) && day==31) {
										// alert("Month "+month+" doesn't have 31 days!")
										return false;
									}
									
									if (month == 2) { // check for february 29th
										var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
										if (day > 29 || (day==29 && !isleap)) {
											// alert("February " + year + " doesn't have " + day + " days!");
											return false;
										}
									}
									return true; // date is valid
								}
		},
		
		_isColor 			: function(objField) {
								strValue	= objField.value;
								if (formChecker._isOptional(objField.className) && (strValue == "")) {
									return true;
								} else {
									var regexp = /^\#?[0-9A-F]{6}$/;
									return regexp.test(strValue.toUpperCase());
								}
		}
	}
}