//Javascript form validation

function validateFormOnSubmit(theForm) {
	var reason = "";

	reason += validateName(theForm.name);
	
	isemail = validateEmail(theForm.email);
	
	isphone = validatePhone(theForm.phone);
	
	if(isemail!='' && isphone!=''){
		reason += 'Phone number or email is required.\n';	
	}
	else{
		if(isemail==''){
			reason += isemail;
		}
		else if(isphone==''){
			reason += isphone;
		}
	}
			
	reason += validateMessage(theForm.message);
    
	if (reason != "") {
    	alert("The following error(s) occurred:\n" + reason);
      return false;
	}

	return true;
}



function validateName(fld) {
    var error = "";
    var illegalChars = /[^A-Za-z \.-]/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = '#dddddd'; 
        error = "Name is required.\n";
    } else if ((fld.value.length < 2) || (fld.value.length > 50)) {
        fld.style.background = '#dddddd'; 
        error = "Name should be at least 2, but less than 50, characters.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = '#dddddd'; 
        error = "Name contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}



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

function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
   
    if (fld.value == "") {
        fld.style.background = '#dddddd';
        error = "Email (or phone number) is required.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = '#dddddd';
        error = "Invalid email.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = '#dddddd';
        error = "Email contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}



function validatePhone(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');    

   if (fld.value == "") {
        error = "Phone number (or email) is required.\n";
        fld.style.background = '#dddddd';
    } else if (isNaN(parseInt(stripped))) {
        error = "Phone number contains illegal characters.\n";
        fld.style.background = '#dddddd';
    } else if (!(stripped.length == 10)) {
        error = "Phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = '#dddddd';
    } else {
        fld.style.background = 'White';
    }
    return error;
}



function validateMessage(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = '#dddddd'; 
        error = "Message is required.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;  
}