/*
Name:		validations.js
Modified:	06/06/2006
Function:	Common validations
Copyright:	UK2 Ltd
*/

function validate_login_form(form) {

    if (form.firstName.value == '') {
        alert("Please enter your first name.");
        form.firstName.focus();
        return false;
    }

    if (form.lastName.value == '') {
        alert("Please enter your last name.");
        form.lastName.focus();
        return false;
    }

    if (form.email.value != '') 
    {
        if (checkEmail(form.email.value)) 
        {
                return true;
        }
        else 
        {
                alert("Please enter a valid email address.");
                form.email.focus();
                return false;
        }
    }
    else 
    {
        alert("Please enter your email address");
        form.email.focus();
        return false;
    }
}

//For checking Null values
function isNull(aStr) {
    var index;
    for (index = 0; index < aStr.length; index++)
        if (aStr.charAt(index) != ' ')
        return false;
    return true;
}

function PopWindow() {
    window.open("", "windowname", "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=425,height=425,top=50,left=50");
}


//For checking invalid E-Mail address
var reEmail = /^[0-9a-zA-Z_\.-]+@[0-9a-zA-Z_\.-]+\..{2,8}$/;

function checkEmail(str) {
    var at = "@";
    var dot = ".";
    var lat = str.indexOf(at);
    var lstr = str.length;
    var ldot = str.indexOf(dot);
    if (str.indexOf(at) == -1) {
        return false;
    }

    if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr) {
        return false;
    }

    if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr) {
        return false;
    }

    if (str.indexOf(at, (lat + 1)) != -1) {
        return false;
    }

    if (str.substring(lat - 1, lat) == dot || str.substring(lat + 1, lat + 2) == dot) {
        return false;
    }

    if (str.indexOf(dot, (lat + 2)) == -1) {
        return false;
    }

    if (str.indexOf(" ") != -1) {
        return false;
    }
    return true;
}

function checkphone(val) {
    str = "^0";
    var reg = new RegExp(str);
    return reg.test(val);
}

// For checking and allowing only certain numeric values for Quantity
function isNumeric(val, allow_dec, allow_neg) {
    var str = "";
    if (allow_neg)         //value can be negative
    {
        str += "^-";
    }
    if (allow_dec)         //value can be decimal 
    {
        str += "[0-9]{1,}\.{0,1}";
    }
    str += "^[0-9]{1,}$";
    var reg = new RegExp(str);
    return reg.test(val);
}

function isAlphaNumeric(varData) {
    varRegExp = new RegExp("^[A-Za-z0-9_]+$");
    if (!varRegExp.test(varData)) {
        return true
    }
    return false
}

function IsValidImageName(strVal) {
    nNoOfArguments = IsValidImageName.arguments.length;

    //if parameter is not supplied
    if (nNoOfArguments < 1) {
        return false;
    }

    //valid characters a supplied string value can have
    var sValidChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-";
    strVal = new String(strVal); //convert the value to a string object

    var bReturn = true
    var i = new Number(0);
    while ((bReturn) && (i < strVal.length)) {
        bReturn = (sValidChars.indexOf(strVal.charAt(i)) >= 0)
        i++
    }
    return (bReturn);
}

/* 
Date Should be in MM/DD/YY
date 1 > date 2 return 1
date 1 < date 2 return -1
date 1 = date 2 return 0

*/

function compareDates(dt1, dt2) {
    var datepart1 = dt1.split("/");
    var datepart2 = dt2.split("/");

    for (i = 0; i < datepart1.length; i++) {
        datepart1[i] = parseInt(parseFloat(datepart1[i]));
        datepart2[i] = parseInt(parseFloat(datepart2[i]));
    }

    if (datepart1[2] > datepart2[2])
        return 1;
    else if (datepart1[2] < datepart2[2])
        return -1;
    else if (datepart2[2] == datepart1[2]) {
        if (datepart1[0] > datepart2[0])
            return 1;
        else if (datepart1[0] < datepart2[0])
            return -1;
        else if (datepart1[0] == datepart2[0]) {
            if (datepart1[1] > datepart2[1])
                return 1;
            else if (datepart1[1] < datepart2[1])
                return -1;
        }
    }
    return 0;
}


function isdefined(variable) {
    //return (typeof(window[variable]) == "undefined")?  false: true;
    return (typeof (variable) == "undefined") ? false : true;
}
//-------------------------------------------------------------------
// isDigit(value)
//   Returns true if value is a 1-character digit
//-------------------------------------------------------------------
function isDigit(num) {
    if (num.length > 1) { return false; }
    var string = "1234567890";
    if (string.indexOf(num) != -1) { return true; }
    return false;
}