/*
Form validation object from:
http://www.devshed.com/c/a/JavaScript/Form-Validation-with-JavaScript/
Form Validation with JavaScript
Copyright 2003 Nariman K, (c) Melonfire   
*/

// 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; 
}
// check to see if input is whitespace only or empty
function isEmpty(val)
{
if (val.match(/^s+$/) || val == "")
{
return true;
}
else
{
return false;
} 
}
// check to see if input is number
function isNumber(val)
{
if (isNaN(val))
{
return false;
}
else
{
return true;
} 
}
// check to see if input is alphabetic
function isAlphabetic(val)
{
if (val.match(/^[a-zA-Z]+$/))
{
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;
} 
}

// 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()
{
for (x=0; x<this.errorList.length; x++)
{
alert("Error: " + this.errorList[x]);
}
}
// 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;
}
// end object