// Generic Form Validation by Jacob Hage (jacob@hage.dk)
// Free JavaScripts from the JavaScript Source (http://javascriptsource.com)
// Original script has been modified by Stephen Cockle (scockle@rogers.com)

// Define variables and error message text
var checkObjects= new Array();
var errors          = "";
var returnVal       = false;
var language        = new Array();
language["header"]  = "Your form was found to contain the following error(s):"
language["start"]   = "      - ";
language["require"] = " is required";
language["min"]     = " - at least ";
language["max"]     = " - no 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";
language["end"]     = "\nPlease review your form and resubmit.";

// Define features of required input fields.
// n = name of the input field (Required)
// type= string, num, email (Required)
// min = the value must have at least [min] characters (Optional)
// max = the value must have maximum [max] characters (Optional)
// d = Optional)
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); }

// Assign features of actual required input fields - must be customized
function initValidate() {
  define('field1', 'string', '"Name"');
  define('field5', 'string', '"Phone"',10);
  define('field6', 'email', '"Email"');
  define('field10', 'string', '"Message"'); }

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

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'] + validateObject.HTMLname + language['require'] + language['num'] + "\n"; }
        else if (validateObject.min && validateObject.max && (validateObject.len < validateObject.min || validateObject.len > validateObject.max)) {
          errors += language['start'] + 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'] + validateObject.HTMLname + language['require'] + language['min'] + validateObject.min + language['chars'] + "\n"; }
        else if (validateObject.max && !validateObject.min &&(validateObject.len > validateObject.max)) {
          errors += language['start'] + validateObject.HTMLname + language['require'] + language['max'] + validateObject.max + language['chars'] + "\n"; }
        else if (!validateObject.min && !validateObject.max && validateObject.len <= 0) {
          errors += language['start'] + validateObject.HTMLname + language['require'] + "\n"; }}
      else if(validateObject.type == "email") {
// Check existence of "@" and "." in email address. 
// Length 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'] + validateObject.HTMLname + language['email'] + "\n"; }}}}
  if (errors) {
    alert(language['header'].concat("\n" + errors + language['end']));
    errors = "";
    returnVal = false; }
  else {
    returnVal = true; }}

// Run initValidate function when page loads
function onLoad() { 
  initValidate(); }