// This function validate Email string in a control whose ID passed as a parameter.
function ValidateEmail(ControlToValidate,ControlToDisplay)
{
	try
	{
		var textValue=document.getElementById(ControlToValidate).value;
		
		//Declare regular expression
        var re = new RegExp('^.+@[^\.].*\.[a-z]{2,}$');

        if (textValue.match(re)) 
        {
            //allow postback to continue
            return true;
        } 
        else
        {
            //inform user that the Email ID is not valid
            if(ControlToDisplay=='')
			{
				alert("Invalid email id");
			}
			else
			{
				document.getElementById(ControlToDisplay).innerHTML = "Invalid email id";	
			}
        
            //Set the focus on non-compliant field
            document.getElementById(ControlToValidate).focus();
        
            //Prevent the postback
            return false;
        }
	}
	catch(err)
	{
		if(ControlToDisplay=='')
		{
			alert("Please check the control ID pass in function ValidateEmail()");
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Please check the control ID pass in function ValidateEmail()";	
		}		
	    return false;
	}
}

// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2028;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}
function isDate(dtStr,ControlToDisplay)
{
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1)
	{
		if(ControlToDisplay=='')
		{
			alert("The date format should be : mm/dd/yyyy");
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "The date format should be : mm/dd/yyyy";
		}		
		return false
	}
	if (strMonth.length<1 || month<1 || month>12)
	{
		if(ControlToDisplay=='')
		{
			alert("Please select valid date");
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Please select valid date";
		}		
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month])
	{
		if(ControlToDisplay=='')
		{
			alert("Please select valid date");
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Please select valid date";
		}		
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear)
	{
		if(ControlToDisplay=='')
		{
			alert("Please select valid date");
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Please select valid date";
		}		
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false)
	{
		if(ControlToDisplay=='')
		{
			alert("Please select valid date");
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Please select valid date";
		}				
		return false
	}
return true
}

// Function to remove white spaces staring and ending of string		
function trim(sString) 
{
    while (sString.substring(0,1) == ' ')
    {
        sString = sString.substring(1, sString.length);
    }
    while (sString.substring(sString.length-1, sString.length) == ' ')
    {
        sString = sString.substring(0,sString.length-1);
    }
    return sString;
}

// This function validate Numeric Value in a control whose ID passed as a parameter.
function ValidateNumeric(ControlToValidate)
{
	var textValue=document.getElementById(ControlToValidate).value;
	if(isNaN(textValue))
    {
        alert('Please enter numeric value');
        textValue="";
        document.getElementById(ControlToValidate).focus();
        return false;
    }
}

// This function validate Mobile No. in a control whose ID passed as a parameter.
function ValidateMobileNo(ControlToValidate,ControlToDisplay)
{
	var textValue=document.getElementById(ControlToValidate).value;
	if(isNaN(textValue))
    {
        if(ControlToDisplay=='')
		{
			alert('Please enter numeric value');
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Please enter numeric value";
		}
        textValue="";
        document.getElementById(ControlToValidate).focus();
        return false;            
    }
    if(textValue.length<10)
    {
		if(ControlToDisplay=='')
		{
        	alert('Mobile no. must be of 10 digits');
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Mobile no. must be of 10 digits";
		}
        document.getElementById(ControlToValidate).focus();            
        return false; 
    }
    if(!(textValue.charAt(0)=="9" || textValue.charAt(0)=="8" || textValue.charAt(0)=="7"))
    {
        if(ControlToDisplay=='')
		{
			alert('Please enter valid mobile no.');
		}
		else
		{
			document.getElementById(ControlToDisplay).innerHTML = "Please enter valid mobile no.";
		}
        document.getElementById(ControlToValidate).focus();            
        return false;
    }  
}

// This function validate URL string in a control whose ID passed as a parameter.
function ValidateURL(ControlToValidate)
{
    try
	{
		var textValue=document.getElementById(ControlToValidate).value;
		
		//Declare regular expression
        var re = new RegExp('^(ftp|https?):\/\/+(www\.)?[a-z0-9\-\.]{3,}\.[a-z]{2}$');
        if (textValue.match(re)) 
        {
            //allow postback to continue
            return true;
        } 
        else
        {
            //inform user that the Email ID is not valid
            alert("Invalid URL !!!");
        
            //Set the focus on non-compliant field
            document.getElementById(ControlToValidate).focus();
        
            //Prevent the postback
            return false;
        }        
	}
	catch(err)
	{
		alert('Please check the Control ID pass in function ValidateURL()');
	    return false;
	}
}

// This function validate UserName string in a control whose ID passed as a parameter.
function ValidateUserName(ControlToValidate)
{
	var textValue=document.getElementById(ControlToValidate).value;
	if(textValue=="")
    {
        alert('Please Enter UserName !!!');
        document.getElementById(ControlToValidate).focus();
        return false;            
    }
	if ((textValue.length < 4) || (textValue.length > 20))
	{
    	alert('UserName must be in between 4 to 20 Characters !!!');
        document.getElementById(ControlToValidate).focus();
        return false;
	}
	var illegalChars = /\W/;
  	// allow only letters, numbers, and underscores
    if (illegalChars.test(textValue))
	{
	   alert('UserName contains illegal characters !!!\nIt allows only letters, numbers, and underscores.');
       document.getElementById(ControlToValidate).focus();
       return false;
    } 
}

// This function is used to set maxlength.
function imposeMaxLength(Object, MaxLen)
{
  return (Object.value.length <= MaxLen);
}

// This function counts the characters of textbox and display left characters(using maxLength of textbox) in a label.
function CountCharacters(sourceTextBox, displayControl, maxlength)
{   
    if(sourceTextBox != null && displayControl != null)
    {
		sourceTextBox = document.getElementById(sourceTextBox);
        displayControl = document.getElementById(displayControl);
        var maxLength = maxlength; //sourceTextBox.maxLength;
        if(sourceTextBox != null)
        {
            var len = sourceTextBox.value.length
            if (len<=maxLength) //if entered charcters less than the Maximum Limit.
            {
//                Shows Number of characters Remaining 
                displayControl.innerHTML = maxLength -len+" characters left";
            }
            else
            {
                sourceTextBox.value = sourceTextBox.value.substring(0, maxLength);
                return false;
            }
        }
    }
}
	
function changeScreenSize(w,h)
{
    window.resizeTo( w,h );	   
}