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libraries/joomla/form/rule/options.php

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+<?php
+/**
+ * @package     Joomla.Platform
+ * @subpackage  Form
+ * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('JPATH_PLATFORM') or die;
+
+/**
+ * Form Rule class for the Joomla Platform.
+ * Requires the value entered be one of the options in a field of type="list"
+ *
+ * @package     Joomla.Platform
+ * @subpackage  Form
+ * @since       11.1
+ */
+class JFormRuleOptions extends JFormRule
+{
+	/**
+	 * Method to test the value.
+	 *
+	 * @param   SimpleXMLElement  $element  The SimpleXMLElement object representing the <field /> tag for the form field object.
+	 * @param   mixed             $value    The form field value to validate.
+	 * @param   string            $group    The field name group control value. This acts as as an array container for the field.
+	 *                                      For example if the field has name="foo" and the group value is set to "bar" then the
+	 *                                      full field name would end up being "bar[foo]".
+	 * @param   JRegistry         $input    An optional JRegistry object with the entire data set to validate against the entire form.
+	 * @param   JForm             $form     The form object for which the field is being tested.
+	 *
+	 * @return  boolean  True if the value is valid, false otherwise.
+	 *
+	 * @since   11.1
+	 */
+	public function test(SimpleXMLElement $element, $value, $group = null, JRegistry $input = null, JForm $form = null)
+	{
+		// Check each value and return true if we get a match
+		foreach ($element->option as $option)
+		{
+			if ($value == (string) $option->attributes()->value)
+			{
+				return true;
+			}
+		}
+		return false;
+	}
+}