// JavaScript Document

// email

function checkEmail (strng) {
var error="";
if (strng == "") {
   error = "* You didn't enter an email address.\n";
}

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

function validCharacters (strng, field) {
var error="";
	
    var illegalChars = /[\W_]/; // allow only letters and numbers

	if (illegalChars.test(strng)) {
      error = "* The " + field + " contains illegal characters.\n";
    } 

return error;
}

// callSign

function checkCallsign (strng) {
	var error="";
	if (strng == "") {
		error = "* You didn't enter a callsign\n";
	}
	if (strng.length < 3) {
		error = "* Callsign must be 3-4 letters long\n";
	}
	if (strng.length > 4) {
		error = "* Callsign must be 3-4 letters long\n";
	}

	return error;    
}


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

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

var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "The phone number contains illegal characters.";
  
    }
    if (!(stripped.length == 10)) {
	error = "* The phone number is the wrong length. Make sure you included 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, field) {
var error = "";
  if (strng.length == 0) {
     error = "* " + field + " has not been filled in.\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) {
var error = "";
   if (!(checkvalue)) {
       error = "Please check a radio button.\n";
    }
return error;
}

function checkOtherPhone(choice, strng) {
var error = "";
   if (choice != 0 && strng.length == 0) {
       error = "* Other phone specified, but not entered.\n";
    }
   if (choice == 0 && strng.length != 0) {
       error = "* Other phone entered, but no type selected.\n";
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice, field) {
var error = "";
    if (choice == 0) {
    error = "* Please select a " + field + " from the drop-down list.\n";
    }    
return error;
}    

function checkIndustryType(choice, field) {
var error = "";
    if ((choice == 1) || (choice == 2) || (choice == 3)) {
		return error;
    }  
	else {
    	error = "* Please select a " + field + " from the drop-down list.\n";
	}
return error;
}