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administrator/components/com_jchoptimize/fields/pluginassignment.php

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+<?php
+
+/**
+ * JCH Optimize - Performs several front-end optimizations for fast downloads
+ *
+ * @package   jchoptimize/joomla-platform
+ * @author    Samuel Marshall <samuel@jch-optimize.net>
+ * @copyright Copyright (c) 2020 Samuel Marshall / JCH Optimize
+ * @license   GNU/GPLv3, or later. See LICENSE file
+ *
+ * If LICENSE file missing, see <http://www.gnu.org/licenses/>.
+ */
+
+defined('_JEXEC') or die('No direct access');
+
+require_once(JPATH_ADMINISTRATOR . '/components/com_modules/helpers/modules.php');
+
+class JFormFieldPluginassignment extends JFormField
+{
+
+        public $type = 'pluginassignment';
+
+
+        public function setup(SimpleXMLElement $element, $value, $group = NULL)
+	{
+		$script = "
+			jQuery(document).ready(function()
+			{
+				menuHide(jQuery('#jform_assignment').val());
+				jQuery('#jform_assignment').change(function()
+				{
+					menuHide(jQuery(this).val());
+				})
+			});
+			function menuHide(val)
+			{
+				if (val == 0 || val == '-')
+				{
+					jQuery('#menuselect-group').hide();
+				}
+				else
+				{
+					jQuery('#menuselect-group').show();
+				}
+			}
+		";
+
+		// Add the script to the document head
+		JFactory::getDocument()->addScriptDeclaration($script);
+
+                return parent::setup($element, $value, $group);
+	}
+
+        protected function getInput()
+        {
+		$html = '<select name="jform[assignment]" id="jform_assignment"> ' .
+				JHtml::_('select.options', ModulesHelper::getAssignmentOptions(0), 'value', 'text', $this->value, true) . 
+			'</select>';
+
+		return $html;
+        }
+
+}