_nicename = __( 'Single Checkbox', 'ninja-forms' ); $this->_settings[ 'label_pos' ][ 'value' ] = 'right'; add_filter( 'ninja_forms_custom_columns', array( $this, 'custom_columns' ), 10, 2 ); add_filter( 'ninja_forms_merge_tag_value_' . $this->_name, array( $this, 'filter_merge_tag_value' ), 10, 2 ); } public function admin_form_element( $id, $value ) { $checked = ( $value ) ? "checked" : ""; return ""; } public function custom_columns( $value, $field ) { if( 'checkbox' == $field->get_setting( 'type' ) ){ $value = ( $value ) ? __( 'checked', 'ninja-forms' ) : __( 'unchecked', 'ninja-forms' ); } return $value; } public function filter_merge_tag_value( $value, $field ) { if( $value && isset( $field[ 'checked_calc_value' ] ) ){ return $field[ 'checked_calc_value' ]; } if( ! $value && isset( $field[ 'unchecked_calc_value' ] ) ){ return $field[ 'unchecked_calc_value' ]; } return $value; } }