/*
 *Copyright © 2001 by Apple Computer, Inc., All Rights Reserved.
 * 
 *Changes by Usman 21Apirl 2007 
 *  I have made changes to this:
 *  added variables to all functions --> 
 *         name--name to be used in error message
 *         error_msg: if this is defined, will overwrite default mesg
 *   added ne function multipleCheckRadio(checkname, name, error_msg, min_check, max_check)
 *         min_check: min radio or checkboxes to be selected
 *         max_check: max radio or checkboxes to be selected
 *            
 */ 

function checkEmail (strng, name, error_msg) {
var error="";
if (strng == "") {
   error = "You didn't enter "+name+".\n";
}

    //var emailFilter=/^.+@.+\..{2,3}$/; //this Filter not very good...can spaces and 2 @ symbols
     var emailFilter = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/; //got from http://www.white-hat-web-design.co.uk/articles/js-validation.php
    if (!(emailFilter.test(strng))) { 
       error = "You didn't enter a valid "+name+".\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "The "+name+" contains illegal characters.\n";
       }
    }

    if(error!="" && error_msg){
       error=error_msg+"\n";
  }
return error;    
}


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

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

var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "The "+name+" number contains illegal characters.\n";
  
    }
    /*if (!(stripped.length == 10)) {
	error = "The "+name+" number is the wrong length. Make sure you included an area code.\n";
    } */
    if(error!="" && error_msg){
       error=error_msg+"\n";
    }
return error;
}


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

function checkPassword (strng, error_msg) {
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";
    }
      if(error!="" && error_msg){
       error=error_msg+"\n";
  }
return error;    
}    


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

function checkName (strng, name, error_msg) {
var error = "";
if (strng == "") {
   error = "You didn't enter a "+name+".\n";
}


    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if (illegalChars.test(strng)) {
    error = "The "+name+" contains illegal characters.\n";
    } 
    if(error!="" && error_msg){
       error=error_msg+"\n";
  }
return error;
}       


// non-empty textbox

function isEmpty(strng, name, error_msg) {
var error = "";
  if (strng.length == 0) {
     error = "You didn't fill in the "+name+".\n"
  }
  if(error!="" && error_msg){
       error=error_msg+"\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, error_msg) {
var error = "";
   if (!(checkvalue)) {
       error = "Please choose "+name+".\n";
    }
    if(error!="" && error_msg){
       error=error_msg+"\n";
    }
return error;
}

function multipleCheckRadio(checkname, name, error_msg, min_check, max_check) {
var error = "";
var no_checked=0;
var error_found= false;

   if(checkname.length){
      for (i=0, n=checkname.length; i<n; i++) {
     
        if (checkname[i].checked) {
            no_checked++;
        } 
     }
   }else{
     if (checkname.checked) {
            no_checked++;
        } 
   }
   
   if(min_check){
     if(no_checked<min_check){
       error_found=true;
       error = "You must choose minimum of "+min_check+" "+name+".\n";
     }
   }
   if(max_check){
     if(no_checked>max_check){
       error_found=true;alert(error_found);
       error = "You cannot choose more then "+max_check+" "+name+".\n";
     }
   }
   if(!min_check && !max_check){
      if(no_checked<1){
        error_found=true;
        error= "You must choose "+name+".\n";
      }
   }
   //if (error_found) {
       //error = "Please choose "+name+".\n";
    //}
    //alert(error_msg);

    if(error_msg){
       if(error!="" && error_msg!=""){
         error=error_msg+"\n";
       }
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice, name, error_msg) {
var error = "";
    if (choice == 0) {
    error = "Please Select "+name+".\n";
    }
    if(error!="" && error_msg){
       error=error_msg+"\n";
    } 
return error;
}