function makeTextNode(text) {
	return document.createTextNode(text);
}


function makeLabel(label, id) {
	var newLabel = document.createElement("label");
	if (id !== undefined && id != "") {
		newLabel.setAttribute("for", id);
	}
	newLabel.appendChild(makeTextNode(label));
	return newLabel;
}

function makeInput(type,id,value,label){
	var newInput = document.createElement("input");
	newInput.setAttribute("type",type);
	if (id !== undefined && id != "") {
		newInput.setAttribute("id", id);
	}
	if (value !== undefined && value != "") {
		newInput.setAttribute("value",value);
	}
	if (label !== undefined && label != "") {
		var newLabel = makeLabel(label,id);
		var newDiv = document.createElement("div");
		newDiv.appendChild(newLabel);
		newDiv.appendChild(newInput);
		return newDiv;
	}
	else{
		return newInput;
	}
}

function makeSelect(id,values,label){
	var newSelect = document.createElement("select");
	if (id !== undefined && id != "") {
		newSelect.setAttribute("id", id);
		newSelect.setAttribute("name", id);
	}
	for(i=0; i<values.length; i++){
		var newOption = document.createElement("option");
		newOption.setAttribute("value",values[i]);
		newOption.appendChild(makeTextNode(values[i]));
		newSelect.appendChild(newOption);
	}
	if (label !== undefined && label != "") {
		var newLabel = makeLabel(label,id);
		var newDiv = document.createElement("div");
		newDiv.appendChild(newLabel);
		newDiv.appendChild(newSelect);
		return newDiv;
	}
	else{
		return newSelect;
	}
}

function makeArray(start,end){
	var myArray = [];
	for(i=start; i<=end; i++){
		var myString = i.toString();
		myArray.push(myString);
	}
	return myArray;
}


function checkInputs(event){
	
	var inputsArray = document.querySelectorAll("div input");
	for(i=0; i<inputsArray.length; i++){
		if (inputsArray[i].value == undefined || inputsArray[i].value == ""){
			var newParentElement = inputsArray[i].parentElement;
			newParentElement.setAttribute("class","error");
			event.preventDefault();
		}
		else{
			var newParentElement = inputsArray[i].parentElement;
			newParentElement.setAttribute("class","");
		}
	}
	
	
	
	var inputsArray = document.querySelectorAll("div select");
	for(i=0; i<inputsArray.length; i++){
		if (inputsArray[i].value == undefined || inputsArray[i].value == ""){
			var newParentElement = inputsArray[i].parentElement;
			newParentElement.setAttribute("class","error");
			event.preventDefault();
		}
		else{
			var newParentElement = inputsArray[i].parentElement;
			newParentElement.setAttribute("class","");
		}
	}
	
}

function checkAgeYear(event){
	
	var selectsArray = document.querySelectorAll("div select");
	
	
	var EXP = document.querySelector("#exp");
	var AGE = document.querySelector("#age");
	
	if(  (AGE.value - EXP.value)  <=18){
			var newParentElement = selectsArray[0].parentElement;
			newParentElement.setAttribute("class","error");
			event.preventDefault();
		}
		else{
			var newParentElement = selectsArray[0].parentElement;
			newParentElement.setAttribute("class","");
		}
}