// JavaScript Document

/****************************************************************
  Code below is used to validate the application form 
*****************************************************************/
// submit the form
function submitForm() {
  var myForm = 'document.apply';

  if (validate(myForm)) {
    document.apply.submit();
  }
//  alert(myForm);
}

// validate the form
function validate() {

var PC = document.getElementById("postcode").value;
//alert ("PC value is - " + PC);

var Country = document.getElementById("country").value;
	if(Country == "United Kingdom"){
	  return (checkField(document.getElementById("title"), 'title') &&
	      checkField(document.getElementById("firstname"), 'first name') &&
	      checkField(document.getElementById("surname"), 'surname') &&
		  checkField(document.getElementById("address1"), 'house number and street') &&
		  checkField(document.getElementById("address4"), 'town/city') &&
		  checkField(document.getElementById("postcode"), 'postcode') &&
		  checkEmail(document.getElementById("email")) &&
		  checkFieldfam(document.getElementById("FamFName11"), 'family details') &&
		  checkPostcode(document.getElementById("postcode")));
	}else{
	  return (checkField(document.getElementById("title"), 'title') &&
	      checkField(document.getElementById("firstname"), 'first name') &&
	      checkField(document.getElementById("surname"), 'surname') &&
		  checkField(document.getElementById("address1"), 'house number and street') &&
		  checkField(document.getElementById("address4"), 'town/city') &&
		  checkFieldfam(document.getElementById("FamFName11"), 'family details') &&
		  checkEmail(document.getElementById("email")));
	}
}

// check family fields
function checkFieldfam(field, name) {
	var Numcards = document.getElementById('numcards').value;
	var FamName = document.getElementById('FamFName11').value;
	var MemType = document.getElementById('memtype').value;
//	alert("Numcards = " + Numcards + "; MemType = " + MemType + "; FamFName = " + FamName);
  var error
  var cont = true;
  if((MemType == 2) && (FamName == '')){
	  if (field.value == '') {
	    error = 'You have selected to add a family membership card but have omitted to enter any details.';
	    alert(error);
		cont = false;
	  }  
	  return cont;
  }
  if((MemType == 2) && (FamName == 'Firstname')){
	  if (field.value == 'Firstname') {
	    error = 'You have selected to add a family membership card but have omitted to enter any details.';
	    alert(error);
		cont = false;
	  }  
	  return cont;
  }
  return cont;	
}


// check postcode field
function checkPostcode(){
var PC = document.getElementById("postcode").value;
//alert ("toCheck contains the value of - " + PC);
// start here
  // Permitted letters depend upon their position in the postcode.
  var alpha1 = "[abcdefghijklmnoprstuwyz]";                       // Character 1
  var alpha2 = "[abcdefghklmnopqrstuvwxy]";                       // Character 2
  var alpha3 = "[abcdefghjkstuw]";                                // Character 3
  var alpha4 = "[abehmnprvwxy]";                                  // Character 4
  var alpha5 = "[abdefghjlnpqrstuwxyz]";                          // Character 5
  
  // Array holds the regular expressions for the valid postcodes
  var pcexp = new Array ();

  // Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1,2})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  
  // Expression for postcodes: ANA NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}[0-9]{1}" + alpha3 + "{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));

  // Expression for postcodes: AANA  NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1}" + alpha4 +"{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  
  // Exception for the special postcode GIR 0AA
  pcexp.push (/^(GIR)(\s*)(0AA)$/i);
  
  // Standard BFPO numbers
  pcexp.push (/^(bfpo)(\s*)([0-9]{1,4})$/i);
  
  // c/o BFPO numbers
  pcexp.push (/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);

  // Load up the string to check
  var postCode = PC;
//	alert ("Postcode variable contains the value - " + postCode);
  // Assume we're not going to find a valid postcode
  var valid = false;
  
  // Check the string against the types of post codes
  for ( var i=0; i<pcexp.length; i++) {
    if (pcexp[i].test(postCode)) {
    
      // The post code is valid - split the post code into component parts
      pcexp[i].exec(postCode);
      
      // Copy it back into the original string, converting it to uppercase and
      // inserting a space between the inward and outward codes
      postCode = RegExp.$1.toUpperCase() + " " + RegExp.$3.toUpperCase();
      
      // If it is a BFPO c/o type postcode, tidy up the "c/o" part
      postCode = postCode.replace (/C\/O\s*/,"c/o ");
      
      // Load new postcode back into the form element
      valid = true;
      
      // Remember that we have found that the code is valid and break from loop
      break;
    }
  }
  var error;
  var cont=true;
  // Return with either the reformatted valid postcode or the original invalid 
  // postcode
  if (valid) {
//	alert ("Postcode should be read as " + postCode);
//  	return postCode; 
	document.getElementById("postcode").value = postCode;
  	return cont;
	
  } else { 
	alert("Invalid postcode");
  	cont=false; 
//  	return false;
  }

   return cont;
// end here
		   
}

// check drop down boxes
function checkSelect(field, name) {
  var error
  var cont = true;

  if (field.value == 'none' || field.value == 'Please Select' || field.value == 0) {
    error = 'Please select ' + name + '. This is a required field.';
    alert(error);
	cont = false;
  }
  return cont;
}

// check text fields
function checkField(field, name) {
  var error
  var cont = true;
  
  if (field.value == '' || field.value == 'First name' || field.value == 'Last name' || field.value == 'Title'  || field.value == 'house number and street') {
    error = 'Please enter ' + name + '. This is a required field.';
    alert(error);
	cont = false;
  }  
  return cont;
}

// check if email address is valid
function checkEmail(field) {
  var error;
  var emailFilter = /^.+@.+\..{2,4}$/;
  var illegalChars= /[\(\)\<\>\,\;\:\\\/\"\[\]\s]/;
  var cont = true;
  
  if (!emailFilter.test(field.value)) {
    error = 'Please enter a valid email address.';
	alert(error);
	cont = false;
  }
  else if (field.value.match(illegalChars)) {
    error = 'Email address does not appear to have the correct format.';
	alert(error);
	cont = false;
  }
  return cont;
}
/******************************************************************/