//---------- [one.ngn] Content Managent System --------------
//----------    created by zerophobic.com      --------------
//-----------------------------------------------------------
// MODULE	:	validation javascript
// FUNCTION	:	performs form validation
// AUTHOR	:	jim richards <grumpy@cyber4.org>
// CREATED	:	01/10/2001
// MODIFIED	:	11/01/2002
//-----------------------------------------------------------
//-----------------------------------------------------------


/* start form validation code */
// returns true if all the characters in value are in str
function isOnly(value, str) {

    // check if character 'c' from value is in str
    for (var i = 0 ; i < value.length ; i++) {
        var c = value.charAt(i);
        if (str.indexOf(c) == -1)
            return false;
    }
    return true;
}

function isValid(value){
	return alphaNumeric(value);
}

function binary(value){
	return alphaNumeric(value);
}

function select(value){
	return true;
}

// function to test for only letters or numbers
function alphaNumeric(value) {

    // for for null and empty
    if ((value == null) || (value == ""))
        return false;

    // check for all blank
    return !isOnly(value, " \t\n");
}

// this checks for only numbers
function numeric(value) {

    if (!isValid(value))
        return false;

    return isOnly(value, "0123456789");
}

function isValidCreditMonth(value) {

    if (!isValid(value))
        return false;

    return isOnly(value, "0123456789") && value.length == 2 && 1 <= value && value <= 12;
}

function isValidCreditYear(value) {

    if (!isValid(value))
        return false;

    // tricky as year is NOT Y2K at all, have a 2 digit value between 00 and 99
    return isOnly(value, "0123456789") && value.length == 2 && 0 <= value && value <= 99;
}

function isValidCreditExpiry(value) {

    if (!isValid(value))
        return false;
	
	

    // tricky as year is NOT Y2K at all, have a 2 digit value between 00 and 99
    return isOnly(value, "0123456789/") && value.length == 5 && value.substring(2,3) == "/";
}

function isValidCreditCard(value) {

    if (!isValid(value))
        return false;
	
	// tricky as year is NOT Y2K at all, have a 2 digit value between 00 and 99
    return isOnly(value, "0123456789");
}

// this checks for a phone valid number
function phoneNumber(value) {

    if (!isValid(value))
        return false;

    // now check for a number, perhaps with '-', '(', ')' and '+' in it ' '
    return isOnly(value, "-|+0123456789() ");
}

// this checks for a valid username
function username(value) {
    
    if (!isValid(value))
        return false;

    // Check that length is 4-12.
    // Check that charset is valid.
    return ((value.length >= 4) && (value.length <= 20)) && (isOnly(value, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_"))
}

function password(value) {

    if (!isValid(value))
        return false;
	
	// Check that length is 4-15.
    if ((value.length >= 4) && (value.length <= 15)){	
		// check that there is at least one numeral
		var str = "0123456789";
	    for (var i = 0 ; i < value.length ; i++) {
	        var c = value.charAt(i);
	        if (str.indexOf(c) != -1)
	            return true;
	    }
	} else {
		return false;
	}    
}

function emailAddress(value) {

	try {
		if (!isValid(value))
			return false;
		// sourced from http://www.breakingpar.com/bkp/home.nsf/Doc?OpenNavigator&U=87256B280015193F87256C40004CC8C6
		var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
		return re.test(value);

		//var at_sign = value.indexOf('@');
		//return at_sign != -1 && at_sign != 0 && at_sign != value.length;
	}
	catch (er) {
		alert('You are using an old browser and we could not validate your email address. Please verify that it is correct before submitting your order.');
		return true;
	}
}

function validate(data_form) {

    // assume valid, until shown otherwise
    var valid_form = true;

    // the error message string for display
    var empty_elements = "";

    // the first empty element
    var first_element = null;

    // loop through the form looking for fields that are required
    // as these are required fields and must have input.
    for (var i = 0 ; i < data_form.length ; i++) {
        var element = data_form.elements[i];

        // the data is invalid if either
        //  element is not required, something is supplied and it has a validation routine it fails
        //   or
        //  element is required, it has a validation routine it fails or it fails the default one

        if(
            (!element.required && (isValid(element.value) && element.validate != null && !element.validate(element.value)))
            ||
            (element.required && ((element.validate != null && !element.validate(element.value)) || !isValid(element.value)))
        ){

            // so the form doesn't submit
            valid_form = false;

            // for the error message (clean it up for display)
            empty_elements += "   - " + element.display_name + "\n";

            // set the first element that is empty for focus (and not hidden)
            if (first_element == null && (element.type != "hidden"))
                first_element = element;
        }
    }

    if (!valid_form) {

        var error_message = "";

        // build the error message
        if (empty_elements != "")
            error_message = "These fields do not have correct values:\n" + empty_elements;

        // and display for all to see
        alert(error_message);

        // and jump to the first element
        if (first_element != null)
            first_element.focus();

    }

    // if cookie code is being used, the call to cookie.save() is made here
    // if there are no errors in the validation of the form
    // if (valid_form)
        // save_data();

    return valid_form;
}
/* end form validation code */