// JavaScript Document
// For a more flexible event registration routine, see
// http://simon.incutio.com/archive/2004/05/26/addLoadEvent
//window.onload = attachFormHandlers;

var fieldNameMap;
var errorFields = new Array();
var errorFieldNames = new Array();
var formCheckCallBack;

function attachFormHandlers()
{
  // Ensure we're working with a 'relatively' standards 
  // compliant browser
  if (document.getElementsByTagName)
  {
    var objForm = document.getElementsByTagName('form');

    for (var iCounter=0; iCounter<objForm.length; iCounter++)
      objForm[iCounter].onsubmit = function(){return checkForm(this);}
  }
}

function checkForm(objForm)
{
  var arClass, bValid;
  var objField = objForm.getElementsByTagName('*');
  var errorCount = 0;
  errorFields = new Array();
  errorFieldNames = new Array();
  
  for (var iFieldCounter=0; iFieldCounter<objField.length; iFieldCounter++)
  {
    // Allow for multiple values being assigned to the class attribute
    arClass = objField[iFieldCounter].className.split(' ');
    for (var iClassCounter=0; iClassCounter<arClass.length; iClassCounter++)
    {
      switch (arClass[iClassCounter])
      {
        case 'required':
			bValid = isNotEmpty(objField[iFieldCounter].value);
			break;
		case 'string':
           bValid = isString(objField[iFieldCounter].value.replace(/^\s*|\s*$/g, ''));
           break;
        case 'number' :
           bValid = isNumber(objField[iFieldCounter].value);
           break;
        case 'email' :
           bValid = isEmail(objField[iFieldCounter].value);
             break;
        default:
           bValid = true;
      }

      if (bValid == false)
      {
		
		// if a field name map exists then user expects to provide extra functionality
		// hence, simple list errors and continue
		if( fieldNameMap != null ) {
			errorFields[errorCount] = fieldNameMap[objField[iFieldCounter].name];
			errorFieldNames[errorCount++] = objField[iFieldCounter].name;
			//objField[iFieldCounter].style.border = "solid red 1px";
			
		// If this field is invalid, leave the testing early,
        // and alert the visitor to this error
		} else {
	        alert('Please review the value you provided for ' + objField[iFieldCounter].name);
			
 			objField[iFieldCounter].select();
			objField[iFieldCounter].focus();
			return false;
		}	
       
      } else {
		  //if( objField[iFieldCounter].form != null )	{
		  //objField[iFieldCounter].style.border = "solid #999999 1px";
		  //}
	  }
    }
  }
 
  // if errors have been listed
  if( errorFields.length > 0 ) {
	  
	// check if user specified a way to handle the errors
	if( formCheckCallBack != null  ) {
		formCheckCallBack();
		
	// simply display the errors via an alert prompt
	} else {
		var errors = "Please Check The Following Fields For Errors\n"
		for( var i = 0; i < getErrorFields().length; i++ ) {
			errors = errors + "  - " + getErrorFields()[i] + "\n";
		}
		
		alert( errors );
		
	} 
	
	// ensure to indicate that there are errors in the current form
	return false;  
  }
  
  return true;
}

function setFieldNameMap(map) {
	fieldNameMap = map;	
}

function getFieldNameMap() {
	return fieldNameMap;	
}

function getErrorFields() {
	return errorFields;	
}

function getErrorFieldNames() {
	return errorFieldNames;	
}

function setFormCheckCallbackMethod( methodName ) {
	formCheckCallBack = methodName;	
}

function isNotEmpty(strValue) {
	return (strValue != null && strValue != "" && strValue.length != 0);
}

function isString(strValue)
{
  return (typeof strValue == 'string' && strValue != '' && isNaN(strValue));
}

function isNumber(strValue)
{
  return (!isNaN(strValue) && strValue != '');
}

function isEmail(strValue)
{
  var objRE = /^[\w-\.\']{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,}$/;

  return (strValue != '' && objRE.test(strValue));
}