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libraries/joomla/form/fields/checkbox.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
+ */
+
+defined('JPATH_PLATFORM') or die;
+
+/**
+ * Form Field class for the Joomla Platform.
+ * Single check box field.
+ * This is a boolean field with null for false and the specified option for true
+ *
+ * @package     Joomla.Platform
+ * @subpackage  Form
+ * @link        http://www.w3.org/TR/html-markup/input.checkbox.html#input.checkbox
+ * @see         JFormFieldCheckboxes
+ * @since       11.1
+ */
+class JFormFieldCheckbox extends JFormField
+{
+	/**
+	 * The form field type.
+	 *
+	 * @var    string
+	 * @since  11.1
+	 */
+	public $type = 'Checkbox';
+
+	/**
+	 * Method to get the field input markup.
+	 * The checked element sets the field to selected.
+	 *
+	 * @return  string   The field input markup.
+	 *
+	 * @since   11.1
+	 */
+	protected function getInput()
+	{
+		// Initialize some field attributes.
+		$class = $this->element['class'] ? ' class="' . (string) $this->element['class'] . '"' : '';
+		$disabled = ((string) $this->element['disabled'] == 'true') ? ' disabled="disabled"' : '';
+		$value = $this->element['value'] ? (string) $this->element['value'] : '1';
+		$required = $this->required ? ' required="required" aria-required="true"' : '';
+
+		if (empty($this->value))
+		{
+			$checked = (isset($this->element['checked'] )) ? ' checked="checked"' : '';
+		}
+		else
+		{
+			$checked = ' checked="checked"';
+		}
+
+		// Initialize JavaScript field attributes.
+		$onclick = $this->element['onclick'] ? ' onclick="' . (string) $this->element['onclick'] . '"' : '';
+
+		return '<input type="checkbox" name="' . $this->name . '" id="' . $this->id . '" value="'
+			. htmlspecialchars($value, ENT_COMPAT, 'UTF-8') . '"' . $class . $checked . $disabled . $onclick . $required . ' />';
+	}
+}