chosen_box
Github

	function chosen_box() {
		return _class('html')->chosen_box('input_name', ['k1' => 'key1', 'k2' => 'key2']);
	}
	function chosen_box($name, $values = [], $selected = '', $extra = []) {
		if (is_array($name)) {
			$extra = (array)$extra + $name;
		} else {
			$extra['name'] = $name;
		}
		$extra['force_id'] = $extra['force_id'] ?: __FUNCTION__.'_'.++$this->_ids[__FUNCTION__];

		asset('chosen');

		$js_options = (array)$extra['js_options'] + [
			'disable_search_threshold'	=> 10,
			'no_results_text'			=> t('No results match'),
			'placeholder_text_multiple' => t('Select Some Options'),
			'placeholder_text_single'	=> t('Select an Option'),
			'search_contains'			=> true,
			// put default js options here
		];
		jquery('$("#'.addslashes($extra['force_id']).'").chosen('.json_encode($js_options).');');

		$func = $extra['multiple'] ? 'multi_select' : 'select_box';
		return $this->$func($extra, $values, $selected);
	}