/********************************************************************************************/
/* FieldValidation.js                                                                       */
/*                                                                                          */
/* These routines are standard javascript functions that perform validations on CGI form    */
/* fields.  All have been tested on browser versions 4 & 5 for IE and Netscape 4.           */
/********************************************************************************************/


/* Check if required text field is blank. If yes, return error message.
 * Accepts list of one to many form elements as parameters.
 */

	function TrapBlankText()
	{
		for (i = 0; i < arguments.length; i++)
		{
			if ((arguments[i].type == "text") | (arguments[i].type == "textarea"))
			{
				if ((arguments[i].value.length == 0) || (arguments[i].value <= '    '))
				{
					arguments[i].focus();
					alert("You have left blank a field that is required.  Please check your input "
							+ "when you are returned to the field. ");
					arguments[i].focus();
					return false;
				}
			}
		}
		return true;
	}

	
	
/* Check if numerical field is populated with text. If yes, replace with 0.
 * Accepts a list of one to many form elements as parameters. 
 */
	function ReplaceNanTextWithZero()
	{
		for (i = 0; i < arguments.length; i++)
		{
			if (arguments[i].type == "text")
			{
				if ( isNaN(Number(arguments[i].value)) || (arguments[i].value <= "") )
				{
					arguments[i].value = 0;
				}
			}
		}
		return true;
	}
	
	
	
/* Check if required numerical field is populated with text. If yes, return error message.
 * Accepts a list of one to many form elements as parameters.
 */	
	function TrapNanText()
	{
		for (i = 0; i < arguments.length; i++)
		{
			if (arguments[i].type == "text")
			{
				if ( isNaN(Number(arguments[i].value)) )
				{
					alert("This field must be a number.  The update canceled.");
					arguments[i].focus();
					return false;
				}
			}
		}
		return true;
	}
	
	
	
/* Check if required option selection has been made. If not, return error message.
 * Accepts a list of one to many form elements as parameters.
 */
	function TrapNoneSelected()
	{
		for (i = 0; i < arguments.length; i++)
		{
			if ((arguments[i].type == "select-one") | (arguments[i].type == "select-multiple"))
			{
				
				if (arguments[i].selectedIndex == 0)
				{
					alert("A selection in this field must be made. The submit has been canceled.");
					arguments[i].focus();
					return false;				
				}
			}
		}
		return true;
	}
	
	
	
/* Check if required radio selection has been made. If not, return error message.
 * Accepts a list of one to many form elements as parameters.
 */	
	function TrapNoRadioSelected()
	{
		for (i = 0; i < arguments.length; i++)
		{
			if (arguments[i][0].type == "radio")
			{
				tempRad = arguments[i];
								
				for (j = 0; j < tempRad.length; j++)
				{
					if (tempRad[j].checked) break;
				}
				if ((j == tempRad.length) || (!tempRad[j].checked))
				{
					alert("A selection in this field must be made. The submit has been canceled.");
					tempRad[0].focus();
					return false;				
				}
			}
		}
		return true;
	}
	
	
	
/* Check if index of required option selection is 0. This is the index number of the first option
 * in the list which is usually "None Selected" or similar. If yes, return error message.
 * Accepts a list of one to many form elements as parameters.
 */
	function TrapZeroSelectValue()
	{
		for (i = 0; i < arguments.length; i++)
		{
			if ((arguments[i].type == "select-one") | (arguments[i].type == "select-multiple"))
			{
				if (arguments[i].options[arguments[i].selectedIndex].value == 0)
				{
					alert("A selection must be make in this field to continue.  "
							+ "Please select another option from the list");
					arguments[i].focus();
					return false;				
				}
			}
		}
		return true;
	}

	
	
	
	
	
	
/*	Check if the EMail address has a valid syntax.  NOTE: this does not go out and
 *  very that the given Email server and address actually exist, it only checks
 *  for proper formatting.  Accepts a list of one to many text elements as parameters. 
 */
	function TrapInvalidEmail() 
	{

/*  First form the Regular Expression object that describes a proper Email address */

		var emailReg = "^[\\w-_\.]*[\\w-_\.]\@[\\w]\.+[\\w]+[\\w]$";
		var regex = new RegExp(emailReg);
		
/*  Then loop through the argument list (they should all be text input elements) and 
 *  check each one against the regular expression.
 */
		for (i = 0; i < arguments.length; i++)
		{
			if (arguments[i].type == "text")
			{
				if (! regex.test(arguments[i].value))
				{
					alert("The Email address entered does not appear to be in a valid format. "
							+ "Please check and reenter. ");
							arguments[i].focus();
							return false;
				}
			}
		}
		
/*  If we get through and everything passes, return true  */
		return true;
	}
	
/*	The next two functions are to findout if a date is before or after the other.
	It accepts only two delimiters, '/' and '-' 
*/
	function isbefore(date1,date2) {
		if (date1.indexOf("/") != -1) {
			var d1_array = date1.split("/");
			var d2_array = date2.split("/");
		}
		else {
			var d1_array = date1.split("-");
			var d2_array = date2.split("-");
		}
		var dt1 = new Date(d1_array[2],d1_array[0]-1,d1_array[1]);
		var dt2 = new Date(d2_array[2],d2_array[0]-1,d2_array[1]);
		
		if (dt1 < dt2) {
			return true;
		}
		else {
			return false;
		}
	}
	
	function isafter(date1,date2) {
		
		return isbefore(date2,date1);
		
	}