// submit the form to the specified page
function goToPage( pageUrl ) {
  // the form object that will be used
  document.location.href=pageUrl;
}

// required_elements contains the names of elements that have to be
// filled in before the form can be submitted 
required_elements = new Array();

// check_format_elements contains the names and formats of elements
// that have to be filled in with the correct format before
// the form can be submitted 
check_format_elements = new Array();

// add an element to the required_elements array
function add_required_element( element_name ) {
	required_elements[ required_elements.length ] = element_name;
}


// add an element to the check_format_elements array
function add_check_format_element( element_name, element_format ) {
	element_to_format = new Array( element_name, element_format )
	check_format_elements[ check_format_elements.length ] = element_to_format;
}

/**
 * returns true if all the required elements are filled in and all
 * the formated elements have the right format. otherwise returns false.
 */
function validate_form() {
  var form_is_valid = true;

  for ( i = 0; i < required_elements.length; i++ ) {
    elements = document.getElementsByName( required_elements[ i ] );
    // there may be more than one element with the same name,
    // eg. radiobuttons
    // NOTE: not sure what the effect of a hidden variable with
    // the same name as a required/formatted element will have
    for ( j = 0; j < elements.length; j++ ) {
      //window.alert( elements[ j ].name + " - " + elements[ j ].type );
      var valid = false;
      valid = validate_required_element( elements[ j ].name, elements[ j ].type );
      if ( !valid ) {
        form_is_valid = false;
      }
      
    }
  }

  for ( i = 0; i < check_format_elements.length; i++ ) {
    var element_name;
    element_name = check_format_elements[ i ][ 0 ];
    var element_format;
    element_format = check_format_elements[ i ][ 1 ];

    elements = document.getElementsByName( element_name );
    for ( j = 0; j < elements.length; j++ ) {
      //window.alert( elements[ j ].name + " - " + elements[ j ].type );
      valid = validate_formatted_element( elements[ j ].name, elements[ j ].type, element_format );
      if ( !valid ) {
        form_is_valid = false;
      }
    }
  }

  // TODO: remove
  //form_is_valid = false;

  return form_is_valid;
}


/**
 * returns true if the required element is filled in, false otherwise
 */
function validate_required_element() {
  // TODO: implement
  return true;
}

/**
 * returns true if the formatted element is filled in with the correct
 * format, false otherwise.
 * note: it will return true if the element
 * is not filled in at all. this is so that optional elements can be
 * tested for formatting.
 */
function validate_formatted_element() {
  // TODO: implement
  return true;
}

function saveResult() {
  goToPage( 'save-to-myplan.php' );
}