// JavaScript Document

function validateFormOnSubmit(theForm) {
	var reason = "";
	
	reason += validateEmpty(theForm.txt_ent_name, 'Name');
	reason += validateEmpty(theForm.txt_business_phone, 'Business Phone');
	reason += validateEmail(theForm.txt_email);
	reason += validatePhone(theForm.txt_home_phone);
	reason += validatePhone(theForm.txt_business_phone);	
			
	if (reason != "") {
		alert("Some fields need correction:\n" + reason);
		return false;
	}

	return true;
}

function validateEmpty(fld, name) {
	var error = "";
	
	if (fld.value.length == 0) {
		fld.style.background = 'Yellow'; 
		error = "The required field " + name + " has not been filled in.\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 = 'Yellow';
        //error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Yellow';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "The email address 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 = "You didn't enter a phone number.\n";
        //fld.style.background = 'Yellow';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = 'Yellow';
    } else if (!(stripped.length == 10)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'Yellow';
    } 
    return error;
}