/*
This is a main function that calls a series of subfunctions, each of which checks a single form element for compliance. If the element complies than sufunction returns an empty string. Otherwise it returns a message describing the error and highlight appropriate element with yellow.
*/

function validateNewsletterFormOnSubmit() {

var theForm = document.getElementById('newsletterform');

var reason = "";

  reason += validateName(theForm.newsletter_name);
  reason += validateEmail(theForm.newsletter_email);
      
  if (reason != "") {
    alert("Some fields need correction:\n" + reason);
    return false;
  }

  // Submit Form
  document.getElementById('newsletterform').submit(); 

}

/*
This is a main function that calls a series of subfunctions, each of which checks a single form element for compliance. If the element complies than sufunction returns an empty string. Otherwise it returns a message describing the error and highlight appropriate element with yellow.
*/

function validateManagedServicesFormOnSubmit() {

var theForm = document.getElementById('managedservicesform');

var reason = "";

  reason += validateName(theForm.name);
  reason += validateEmail(theForm.email);
  reason += validatePhone(theForm.phone);

  if (reason != "") {
    alert("Some fields need correction:\n" + reason);
    return false;
  }

  // Submit Form
  document.getElementById('managedservicesform').submit();

}
/*

The function below checks if the user entered anything at all in the Name field. If its not blank, we check the length of the string and permit only Name that are between 2 and 20 characters. Next, we use the JavaScript regular expression /\W/ to forbid illegal characters from appearing in Names. Wewant to allow only letters, numbers and underscopes.

*/

function validateName(fld) {
    var error = "";
    //var illegalChars = /\W/; // allow letters, numbers, and underscores
    
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]\@\$\%\#\!\^\&\*]/ ;
   
 
    if (fld.value == "") {
        fld.style.background = 'red'; 
        error = "You didn't enter a name.\n";
    } else if ((fld.value.length < 2) || (fld.value.length > 20)) {
        fld.style.background = 'red'; 
        error = "The name is the wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'red'; 
        error = "The name contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    } 
    return error;
}

/*
The function below checks if a required field has been left empty. If the required field is blank, we return the error string to the main function. If it.s not blank, the function returns an empty string.
*/

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

/*
The function below checks the password field for blankness and allow only letters and numbers - no underscopes this time. So we should use a new regular expression to forbid underscopes. This one /[\W_]/ allow only letters and numbers. Next, we want to permit only passwords that contain letters and at least one numeral. For that we use the seacrh() method and two more regular expressions: /(a-z)+/ and /(0-9)/.
*/

function validatePassword(fld) {
    var error = "";
    var illegalChars = /[\W_]/; // allow only letters and numbers 
 
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter a password.\n";
    } else if ((fld.value.length < 7) || (fld.value.length > 15)) {
        error = "The password is the wrong length. \n";
        fld.style.background = 'Yellow';
    } else if (illegalChars.test(fld.value)) {
        error = "The password contains illegal characters.\n";
        fld.style.background = 'Yellow';
    } else if (!((fld.value.search(/(a-z)+/)) && (fld.value.search(/(0-9)+/)))) {
        error = "The password must contain at least one numeral.\n";
        fld.style.background = 'Yellow';
    } else {
        fld.style.background = 'White';
    }
   return error;
}  

/*
Next we want to see if the email address the user entered is real. This means that the input data must contain at least an @ sign and a dot (.). Also, the @ must not be the first character of the email address, and the last dot must at least be one character after the @ sign. 

At first we check if the user entered anything at all in the email field. Next, we use regular expression and the test() method to check the field for a compliance. Also we will use trim() function that will trim leading whitespace off the string. This won.t be perfect validation . it is possible to slip not compliant addresses by it . but it's normally good enough.
*/

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 = 'red';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'red';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'red';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

/*
The function below checks if the phone number is valid. At first we use regular expression and the replace() method to clear out any spacer characters. Next, we use the isNaN() function to check if the phone number contain only numbers. At last we check the length of the string and permit only phone numbers with 10 digits.
*/

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 = 'Red';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = 'Red';
    } else if (!(stripped.length == 10)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'Red';
    } 
    return error;
}