// formChecker v1.5.0 (February 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	sunday, Octobre 14, 2007
// 			- CHANGE 	: while not wanting this to depend on prototype, extra checks are mad to ensure everything works fine
//							checks to the existance of id formSubmit and spinner
//							adding them to ensure no error is envoked resulting in a submit of the form (ajax)
//
// 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 ;)

var formChecker = {

	okColor			: '#ffffff',									// background to set when value is ok (textfield, textarea, select)
	nokColor		: '#ffffff',	/* '#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		: 'An error was found, please check the highlighted fields',		// 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
	colorForm		: '',

	checkForm		: function (daForm) {						
						var arClass, bValid, gotError;		  
						var objForm= daForm;
						
						formChecker.colorForm = objForm.style.backgroundColor;	
						
						//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;
						if (document.getElementById('formSubmit')) {
							var button = document.getElementById('formSubmit');
						} else if(document.getElementById('newsletterSubmit')) {
							var button = document.getElementById('newsletterSubmit');
						} else if(objForm.submit == undefined) {
							alert("Error, no submit button could be found (no formSubmit, nor button with the name submit");
						} else {
							var button = objForm.submit;							
						}
						/*button.disabled		= true;*/
						if (document.getElementById('spinner')) {
							document.getElementById('spinner').style.visibility	= 'visible';
						} else {
							objForm.style.background = "#FFFFCC";
						}
						
						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;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'check':		      	
										bValid 		= formChecker._isChecked(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgCheck;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'string':
										bValid 		= formChecker._isString(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgString;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'number' :
										bValid 		= formChecker._isNumber(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgNumber;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										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;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										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) {
							
							button.disabled		= false;							
							
							if (document.getElementById('spinner')) {
								document.getElementById('spinner').style.visibility	= 'hidden';
							} else {
								objForm.style.background = formChecker.colorForm;
							}
							
							if (formChecker.nokMessage != '') {
								//alert(formChecker.nokMessage);
								if (daForm.id != 'newsletter') {
									document.getElementById('notification').innerHTML = document.getElementById('errMsgContact').value;
								} else {
									document.getElementById('errNewsletter').innerHTML = document.getElementById('errMsgNewsletter').value;
								}
							}
							
							return false;
							
						} else {
							if (!document.getElementById('spinner')) {								
								objForm.style.background = formChecker.colorForm;
							}
							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
							}
	}
}