// Functions to validate form


// email

function checkEmail (strng, name) {
var error="";
if (strng == "") {
   error = "* " + name + " - this field is required.\n";
}
else
	{

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "* " + name + " - please enter a valid email address.\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "* " + name + " - the email address contains illegal characters.\n";
       }
    }

	}
return error;    
}


// phone number - strip out delimiters and check for 10 digits

function checkPhone (strng, name) {
var error = "";
if (strng == "") {
   error = "* " + name + " - this field is required.\n";
}
else
  {

    var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); 
       //strip out acceptable non-numeric characters
      if (isNaN(parseInt(stripped))) {
         error = "* " + name + " - contains illegal characters.";
      }
      else {
        if (!(stripped.length == 10)) {
  	    error = "* " + name + " - please include an area code.\n";
  	}
      } 

  }
return error;
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a password.\n";
}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 8)) {
       error = "The password is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
    }  
return error;    
}    


// username - 4-10 chars, uc, lc, and underscore only.

function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.\n";
}


    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 4) || (strng.length > 10)) {
       error = "The username is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
    error = "The username contains illegal characters.\n";
    } 
return error;
}       


// non-empty textbox

function isEmpty(strng, name) {
var field = name
var error = "";
  if (strng.length == 0) {
     error = "* " + field + " - this is a required field.\n"
  }
return error;	  
}

// was textbox altered

function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
  }
return error;
}

// exactly one radio button is chosen

function checkRadio(checkvalue, name) {
var error = "";
   if (!(checkvalue)) {
       error = "* " + name + " - please select an option.\n";
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice, name) {
var error = "";
    if (choice == 0) {
    error = "* " + name + " - please select an option from the list.\n";
    }    
return error;
}


//check to see if value is a positive integer

function checkMoney(strng, name) {
var error = "";

if (strng == "") {
   error = "* " + name + " - this field is required.\n";
}
else
 {
    for (var i = 0; i < strng.length; i++) {
	var oneChar = strng.charAt(i)
	if (oneChar < "0" || oneChar > "9" )

	{
	   error = "* " + name + " - please enter a valid number with no punctuation.\n";
  
  	}
     }
 }
return error;
}