// Generic Form Validation
// Jacob Hage (jacob@hage.dk)
var checkObjects    = new Array();
var errors      = "";
var returnVal       = false;
var language        = new Array();

language["header"]  = "The following error(s) occured:"
language["start"]   = "->";
language["field"]   = " Field ";
language["require"] = " is required";
language["min"]     = " and must consist of at least ";
language["max"]     = " and must not contain more than ";
language["minmax"]  = " and no more than ";
language["chars"]   = " characters";
language["num"]     = " and must contain a number";
language["email"]   = " must contain a valid e-mail address";

// -----------------------------------------------------------------------------
// define - Call this function in the beginning of the page. I.e. onLoad.
// n = nom de variable du champs (Requis) Ex : text1
// type = string, num, email (Requis) Ex : string
// HTMLname = nom du champs (Requis) Ex : Prénom
// min = la valeur doit avoir au moins [min] caractères (Optionel)
// max = la valeur doit avoir au maximum [max] caractères (Optionel)
// d = (Optionel)
// -----------------------------------------------------------------------------

//fonction define
function define(n, type, HTMLname, min, max, d)
{
    var p;
    var i;
    var x;

    if (!d) d = document;

    if ((p=n.indexOf("?"))>0&&parent.frames.length)
    {
        d = parent.frames[n.substring(p+1)].document;
        n = n.substring(0,p);
    }

    if (!(x = d[n]) && d.all) x = d.all[n];

    for (i = 0; !x && i < d.forms.length; i++)
    {
        x = d.forms[i][n];
    }

    for (i = 0; !x && d.layers && i < d.layers.length; i++)
    {
        x = define(n, type, HTMLname, min, max, d.layers[i].document);
        return x;
    }

    eval("V_"+n+" = new formResult(x, type, HTMLname, min, max);");

    checkObjects[eval(checkObjects.length)] = eval("V_"+n);
}

//fonction formResult
function formResult(form, type, HTMLname, min, max)
{
    this.form = form;
    this.type = type;
    this.HTMLname = HTMLname;
    this.min  = min;
    this.max  = max;
}

//fonction validate
function validate()
{

    if (checkObjects.length > 0)
    {
        errorObject = "";

        for (i = 0; i < checkObjects.length; i++)
        {
            validateObject = new Object();
            validateObject.form = checkObjects[i].form;
            validateObject.HTMLname = checkObjects[i].HTMLname;
            validateObject.val = checkObjects[i].form.value;
            validateObject.len = checkObjects[i].form.value.length;
            validateObject.min = checkObjects[i].min;
            validateObject.max = checkObjects[i].max;
            validateObject.type = checkObjects[i].type;

            if (validateObject.type == "num" || validateObject.type == "string")
            {
                if ((validateObject.type == "num" && validateObject.len <= 0) || (validateObject.type == "num" && isNaN(validateObject.val)))
                    {
                    errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['num'] + "\n";
                    }
                else if (validateObject.min && validateObject.max && (validateObject.len < validateObject.min || validateObject.len > validateObject.max))
                    {
                    errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['min'] + validateObject.min + language['minmax'] + validateObject.max+language['chars'] + "\n";
                    }
                else if (validateObject.min && !validateObject.max && (validateObject.len < validateObject.min))
                    {
                    errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['min'] + validateObject.min + language['chars'] + "\n";
                    }
                else if (validateObject.max && !validateObject.min &&(validateObject.len > validateObject.max))
                    {
                    errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['max'] + validateObject.max + language['chars'] + "\n";
                    }
                else if (!validateObject.min && !validateObject.max && validateObject.len <= 0)
                    {
                    errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + "\n";
                    }
            }
            else if(validateObject.type == "email")
            {
                // Checking existense of "@" and ".".
                // Length of must >= 5 and the "." must
                // not directly precede or follow the "@"
                if ((validateObject.val.indexOf("@") == -1) || (validateObject.val.charAt(0) == ".") || (validateObject.val.charAt(0) == "@") || (validateObject.len < 6) || (validateObject.val.indexOf(".") == -1) || (validateObject.val.charAt(validateObject.val.indexOf("@")+1) == ".") || (validateObject.val.charAt(validateObject.val.indexOf("@")-1) == "."))
                {
                    errors += language['start'] + language['field'] + validateObject.HTMLname + language['email'] + "\n";
                }
            }
            
        }
    }

    if (errors)
    {
        alert(language["header"].concat("\n" + errors));
        errors = "";
        
        //
        return_val=false;
        
        return false;
    }
    else
    {
        //
        return_val=true;
        
        return true;
    }
}