//sets all form elemnts to be optional by default
function requiredElements() {
	var keepGoing = true;
	for(var i = 0; i < document.userInfo.length; i++) {
		//check each form element to see if it is in the list of required elements
		for(var m = 0; (m < arguments.length) && keepGoing; m++) {
			if(document.userInfo.elements[i].name == arguments[m]){
				keepGoing = false;
				var asterisk = document.createTextNode("*");
				var tempElem = document.userInfo.elements[i];
				tempElem.parentNode.insertBefore(asterisk, tempElem.previousSibling);
			}
		}
		if(keepGoing) document.userInfo.elements[i].optional = true;
		keepGoing = true;
	}
}


// returns true if a string contains only whitespace characters
function isblank(s) {
	for(var i = 0; i < s.length; i++ ) {
		var c = s.charAt(i);
		if ((c != ' ') && (c != '\n') && (c != '')) return false;
	}
	return true;
}


//this function performs the form verification and is invoked from the onsubmit event handler.
//The handler should return whatever value this function returns.
function verify(f) {
	var empty_fields = false;
	//Loop through the elements of the form, looking for all Text and Textarea elements that don't have an "optional" property defined.
	//Then check for fields that are empty and make a list of them. Put together error messages for fields that are wrong.
	for(var i = 0; i < f.length; i++) {
		
		var e = f.elements[i];
		
		if (((e.type =="text") || (e.type == "textarea")) && !e.optional) {
			//first check if the field is empty
			if ((e.value == null) || (e.value == "") || isblank(e.value)) {
				empty_fields = true;
				var tempStr = e.name.concat("Div");
				var tempElem = document.getElementById(tempStr);
					tempElem.className = "requiredFieldHighlight";
				continue;
			}
		}
	}
	
	//Now, if there were any errors, display the messages, and return false to prevent the form from being submitted. Otherwise, return true.
	if(!empty_fields) return true;
	displayError();
	
	return false;
}


//This function searches through the email submit field on the eventDescription.xsl page and checks it for an '@' symbol followed by a "." in the address.
function verifyEmail(id) {
	var fieldElem = document.getElementById(id);
	var tempStr = fieldElem.value;
	if((tempStr != "") && (tempStr.indexOf(" ") == -1 )) {		
		var firstAtSymIndex = tempStr.indexOf("@");
		var periodIndex = tempStr.indexOf(".", firstAtSymIndex);
		if((firstAtSymIndex != -1) && (periodIndex != -1)){
			return true;
		}
	}
	alert("Please enter a valid email address.");
	fieldElem.value = "example@domain.com";
	return false;
}

function displayError() {
	document.getElementById('errorMsg').style.display = "block";
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function requiredElementsQuestionnaire() {
	var keepGoing = true;
	for(var i = 0; i < document.questionnaireAnswers.length; i++) {
		//check each form element to see if it is in the list of required elements
		for(var m = 0; (m < arguments.length) && keepGoing; m++) {
			if(document.questionnaireAnswers.elements[i].name == arguments[m]){
				keepGoing = false;
				var asterisk = document.createTextNode("*");
				document.questionnaireAnswers.elements[i].parentNode.insertBefore(asterisk,document.questionnaireAnswers.elements[i].parentNode.firstChild);
			}
		}
		if(keepGoing) 
		{
			document.questionnaireAnswers.elements[i].optional = true;
		}
		keepGoing = true;
	}
}

function verifyQuestionnaire(f) {
	var empty_fields = false;
	//Loop through the elements of the form, looking for all Text and Textarea elements that don't have an "optional" property defined.
	//Then check for fields that are empty and make a list of them. Put together error messages for fields that are wrong.
	for(var i = 0; i < f.length; i++) {
		
		var e = f.elements[i];
		
		if (!e.optional) {
			//first check if the field is empty
			if ((e.value == null) || (e.value == "") || isblank(e.value)) {
				empty_fields = true;
				var tempStr = e.name.concat("Div");
				var tempElem = document.getElementById(tempStr);
				tempElem.className = "requiredFieldHighlight";
				continue;
			}
		}
	}
	
	//Now, if there were any errors, display the messages, and return false to prevent the form from being submitted. Otherwise, return true.
	if(!empty_fields) return true;
	displayError();
	return false;
}