// Form Validations 

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

  reason += validatename(theForm.name);
  reason += validateEmail(theForm.email);
      
  if (reason != "") {
    alert("Error - You cannot submit form for the following reasons:\n" + reason);
    return false;
  }

  return true;
}


function validateEmpty(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = '#FF3C3C';
        fld.style.color = 'White'; 
        error = "The required field has not been filled in.\n"
    } else {
        fld.style.background = 'White';
        fld.style.color = '#969873'; 
    }
    return error;  
}

function validatename(fld) {
    var error = "";
    // names can contain whitespace
    //var illegalChars = //; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = '#FF3C3C'; 
        fld.style.color = 'White'; 
        error = "Please enter your name.\n";
    } else if ((fld.value.length < 4) || (fld.value.length > 15)) {
        fld.style.background = '#FF3C3C'; 
        fld.style.color = 'White'; 
        error = "The name must be longer than 4 characters.\n";
    } else if (fld.value == "Your Name") {
        fld.style.background = '#FF3C3C'; 
        fld.style.color = 'White'; 
        error = "Please enter your name.\n";
    } else {
        fld.style.background = 'White';
        fld.style.color = '#969873'; 
    }
    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 = '#FF3C3C';
        fld.style.color = 'White'; 
        error = "Please enter email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = '#FF3C3C';
        fld.style.color = 'White'; 
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = '#FF3C3C';
        fld.style.color = 'White'; 
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
        fld.style.color = '#969873'; 
    }
    return error;
}
// End Form validation methods