//SCRIPT with several functions used for validation purposes and other form purposes

// Array to hold error messages
var errors = new Array();

// Function to add an error message to the array
function addError(msg)
{
    if ( (msg != null) && (msg.length > 0) )
        errors.push(msg);
}

// Function to validate whether all form fields are filled
// Parameter notRequired contains an array of fieldnames not to be checked
// Parameter identifier contains initial characters of the fields to be checked
// Returns the names of the fields that failed the verification, separated by commas.
function validate(myForm, notRequired, identifier)
{               
    var strCompulsory = '';          

                

        for (var i=0;i< myForm.elements.length;i++)

        { // for all of the elements on the form..

            // except those excluded

            var exclude = false;

            if (notRequired != null)

              for (var j=0; j < notRequired.length; j++)

                if (myForm.elements[i].name == notRequired[j])

                    exclude = true;

                    

            if ( ((myForm.elements[i].name.indexOf(identifier) == 0) || (identifier == null)) &&

                 (!exclude) ) 

            { // if the element's name starts with the identifier or no identifier is required..

                if (myForm.elements[i].type == 'select-one' || myForm.elements[i].type == 'select-multiple') 

                {

                    // if it's a list element(for Nav)..

                    if (!myForm.elements[i].options[myForm.elements[i].selectedIndex].value)

                    {

                        // and if the element is empty give a warning

                        strCompulsory = strCompulsory + ' ' + myForm.elements[i].name + ',';

                    }

                }

                else

                    if (!myForm.elements[i].value) 
                    {
                        strCompulsory = strCompulsory + ' ' + myForm.elements[i].name + ',';
                    }               
            } 
        }
        return strCompulsory;
    } 

// Function to assess whether a specified string has a predefined HTTP URL format.
// Returns true ou false.    
function isSite(siteURL) 
{   
        var siteok=/^(http:\/\/)?[A-Za-z0-9-_]+\.([a-zA-Z]{2,3}|[0-9]{1,3})[A-Za-z0-9-_%&\?\/.=]+$/;        
        return checkRegEx(siteURL, siteok);
}

// Function to assess whether a specified string has a predefined e-mail format.
// Returns true ou false.
function isEmail(mailAddress) 
{   
        var mailok=/^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/;       
        return checkRegEx(mailAddress, mailok);
}

// Function to assess whether a specified string has a predefined date format: dd-mm-yyyy.
// Returns true ou false.
function isDateFormat(dateStr) 
{   
        var dateok=/^\d{2}(\/|\-)\d{2}(\/|\-)\d{4}$/;
        return checkRegEx(dateStr, dateok);
}

// Function to assess whether a specified date is correct and actual (after 1900). Date must be in the right format
// Returns true ou false.
function isDate(day,month,year) 
{           
    if (year > 1900)
    {        
         switch(month)
         {
                    case '1':
                    case '3':
                    case '5':
                    case '7':
                    case '8':
                    case '01':
                    case '03':
                    case '05':
                    case '07':
                    case '08':
                    case '10':
                    case '12':                        
                        if (day <= 31) return true;
                        else return false;
                        break;
                    case '4':
                    case '6':
                    case '9':
                    case '04':
                    case '06':
                    case '09':
                    case '11':
                        if (day <= 30) return true;
                        else return false;
                        break;
                    case '2':
                    case '02':
                        if (isLeapYear(year))   
                        {
                            if (day <= 29) return true;
                            else return false;
                        }
                        else
                        {
                            if (day <= 28) return true;
                            else return false;
                        }
                        break;
                    default: return false;
         }          
   }
   else return false;
}

// Function to assess whether a specified date is in the future. Date must be in the right format
// Returns true ou false.
function isFutureDate(day,month,year) 
{          
    var thisDate=new Date()
    thisDate.setFullYear(year,month-1,day)
    var today = new Date()
    if (today >= thisDate)
        return false;
    else
        return true;
}

function isLeapYear(year)
{
        if (year%400 == 0) return true;
        else if ( (year%4 == 0) && (year%100 != 0) ) return true;
        else return false;
}

// Function to assess whether a specified string matches a given regular expression
// Returns true ou false.
function checkRegEx(str, regextrue) 
{      
        var reg = regextrue; // valid
        if (reg.test(str)) // if syntax is valid
            return true;
        else return false; // if syntax is not valid
}

// Function to generate a password, all capitals, with a specific size, and a specific prefix
function genPassword(size, prefix)
{
   var chars = new Array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','X','Z','0','1','2','3','4','5','6','7','8','9');
   var passSize = size;
   var pass = prefix;
   for (var i = 0; i < passSize; i++)
   {
                var pos = Math.floor(Math.random()* chars.length);
                pass = pass + chars[pos];
   }
   return pass;
}

 // Function to determine whether a form has at least one field filled out 
    // exceptions made to hidden fields and reset/submit buttons
    // Returns true ou false.
  function atLeast(myForm)
    {
        var foundOne = false;              
        
        for (var i=0;i< myForm.elements.length;i++)
        { // for all of the elements on the form..                
                if (myForm.elements[i].type == 'select-one' || myForm.elements[i].type == 'select-multiple') 
                {
                    // if it's a list element(for Nav)..
                    if (myForm.elements[i].options[myForm.elements[i].selectedIndex].value)
                    {
                        // and if the element is not empty found one                       
                        foundOne = true;
                    }
                }
                else
                {
                    if  ( (myForm.elements[i].type != 'hidden') &&
                        (myForm.elements[i].type != 'reset') &&
                        (myForm.elements[i].type != 'submit') )
                    {
                        if (myForm.elements[i].value) 
                        {                                                   
                            foundOne = true;
                        }                                              
                    }
                }
        }       
        return foundOne;
    }