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<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_fields
 *
 * @copyright   (C) 2016 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */
defined('_JEXEC') or die;

JFormHelper::loadFieldClass('list');

/**
 * Fields Section
 *
 * @since  3.7.0
 */
class JFormFieldSection extends JFormFieldList
{
	public $type = 'Section';

	/**
	 * Method to attach a JForm object to the field.
	 *
	 * @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 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]".
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   3.7.0
	 */
	public function setup(SimpleXMLElement $element, $value, $group = null)
	{
		$return = parent::setup($element, $value, $group);

		// Onchange must always be the change context function
		$this->onchange = 'fieldsChangeContext(jQuery(this).val());';

		return $return;
	}

	/**
	 * Method to get the field input markup for a generic list.
	 * Use the multiple attribute to enable multiselect.
	 *
	 * @return  string  The field input markup.
	 *
	 * @since   3.7.0
	 */
	protected function getInput()
	{
		// Add the change context function to the document
		JFactory::getDocument()->addScriptDeclaration(
			"function fieldsChangeContext(context)
				{
					var regex = new RegExp(\"([?;&])context[^&;]*[;&]?\");
					var url = window.location.href;
					var query = url.replace(regex, \"$1\").replace(/&$/, '');
    					window.location.href = (query.length > 2 ? query + \"&\" : \"?\") + (context ? \"context=\" + context : '');
				}"
		);

		return parent::getInput();
	}
}