// JavaScript Document

////////////////////////////////////////////////////////////////////////
//http://www.devshed.com/c/a/JavaScript/Form-Validation-with-JavaScript/
////////////////////////////////////////////////////////////////////////

// create object
function formvalidator()
{
		// set up array to hold error messages
		this.errorList = new Array;
		// set up object methods
		this.isEmpty = isEmpty; 
		this.isNumber = isNumber; 
		this.isAlphabetic = isAlphabetic; 
		this.isAlphaNumeric = isAlphaNumeric; 
		this.isWithinRange = isWithinRange; 
		this.isEmailAddress = isEmailAddress; 
		this.isChecked = isChecked; 
		this.raiseError = raiseError; 
		this.numErrors = numErrors; 
		this.displayErrors = displayErrors; 
		this.stringLength = stringLength;

		// check to see if input is whitespace only or empty
		function isEmpty(val)
		{
			val = Trim(val);
			if (val.match(/^s+$/) || val == "" || val == " ")
			{
				return true;
			}
			else
			{
				return false;
			} 
		}
		// check to see if input is number
		function isNumber(val)
		{
			if (isNaN(val))
			{
				return false;
			}
			else
			{
				return true;
			} 
		}
		// check to see if input is alphabetic
		function isAlphabetic(val)
		{
			if (val.match(/^[a-zA-Z]+$/))
			{
				return true;
			}
			else
			{
				return false;
			} 
		}
		// check to see if input is alphanumeric
		function isAlphaNumeric(val)
		{
			if (val.match(/^[a-zA-Z0-9]+$/))
			{
				return true;
			}
			else
			{
				return false;
			} 
		}
		// check to see if value is within range
		function isWithinRange(val, min, max)
		{
			if (val >= min && val <= max)
			{
				return true;
			}
			else
			{
				return false;
			} 
		}
		// check to see if input is a valid email address
		function isEmailAddress(val)
		{
			if (val.match(/^([a-zA-Z0-9])+([.a-zA-Z0-9_-])*@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-]+)+/))
			{
				return true;
			}
			else
			{
				return false;
			} 
		}
		function stringLength(string){
			
			if(string.length < 6 || string.length > 16){
				return true;
			}
			else
			{
				return false;
			} 
			
		}
		// check to see if form value is checked
		function isChecked(obj)
		{
			if (obj.checked)
				{
					return true;
				}
			else
				{
					return false;
				} 
		}
		
		// display all errors
		// iterate through error array and print each item
		function displayErrors()
		{
			var output = " " ;
			for (x=0; x<this.errorList.length; x++)
				{
					output += "<br>" + this.errorList[x] + "<br>";
					
				}
			document.getElementById('error').innerHTML = output;
		}
		
		// add an error to error list
		function raiseError(msg)
		{
			this.errorList[this.errorList.length] = msg;
		}
		
		// return number of errors in error array
		function numErrors()
		{
			return this.errorList.length;
		}
		
		function Trim(STRING){
			STRING = Ltrim(STRING);
			return Rtrim(STRING);
			}
			
			
		function Rtrim(STRING){
		while(STRING.charAt((STRING.length -1))==" ")
			{
				STRING = STRING.substring(0,STRING.length-1);
			}
			return STRING;
		}
		
		function Ltrim(STRING){
		while(STRING.charAt ==" ")
			{
				STRING = STRING.replace(STRING.charAt ,"");
			}
		return STRING;
		}
		
// end object
}