Please provide example for custom sanitization of nested subgroup fields

This topic has 6 replies, 2 voices, and was last updated 2 years, 6 months ago by Prabakaran Shankar.

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September 27, 2022 at 9:37 PM #38436

Participant

In the custom sanitization callback, how to get the data from nested subgroups. Because when I use wp_kses to sanitize the nested subgroup type: textarea, it results "PHP Fatal error: Uncaught TypeError: preg_match(): Argument #2 ($subject) must be of type string".
Do I need to unserialize the nested subgroup data and serialize it again before returning $value?

September 27, 2022 at 11:24 PM #38442

Long Nguyen

Moderator

Hi,

Please follow this documentation to know how to create a sanitization callback for a subfield in a group, the sub-subfield in a subgroup will work like that https://docs.metabox.io/sanitization/#sanitizing-subfields-in-a-group

September 28, 2022 at 9:07 AM #38445

Prabakaran Shankar

Participant

Hi, thank you for the reference.


add_filter( 'rwmb_meta_boxes', function ( $meta_boxes ) {
    $meta_boxes[] = [
        'title'  => 'Multi-level nested groups',
        'fields' => [
            [
                'id'     => 'group',
                'type'   => 'group',
                 'sanitize_callback' => 'my_subfield_validation',
                'fields' => [
                    [
                        'name' => 'Text',
                        'id'   => 'text',
                    ],
                    [
                        'name'   => 'Sub group',
                        'id'     => 'sub_group',
                        'type'   => 'group',
                        'fields' => [
                            // Normal field (cloned)
                            [
                                'name'  => 'Sub text1',
                                'id'    => 'sub_text1',
'type'=> 'text',
                            ],
[
                                'name'  => 'Sub text2',
                                'id'    => 'sub_text2',
'type'=> 'textarea',
                            ],
                        ],
                    ],
                ],
            ],
        ],
    ];
    return $meta_boxes;
} );
function my_subfield_validation( $value ) {
// this is for fields    
if ( empty( $value['text'] ) ) {
        $value['text'] = 'Hello World!';
    }
// this is for sub-group
$sub_group = isset($value['sub_group'])? $value['sub_group']:[];
$tags = array();
if(!empty($sub_group)){
 $value['sub_group'] = wp_kses($value['sub_group'], $tags);
}
//above condition results "PHP Fatal error: Uncaught TypeError: preg_match(): Argument #2 ($subject) must be of type string"
    return $value;
}

how to pass sub-group value to sanitize

September 28, 2022 at 10:48 PM #38463

Long Nguyen

Moderator

Hi,

If you want to sanitize a custom field in a subgroup, for example sub_text1, please change the code to this one

if( !empty( $sub_group ) ){
    $value['sub_group']['sub_text1'] = wp_kses_post( $sub_group['sub_text1'] );
}

$value['sub_group'] is not a string to sanitize so the error message will appear. Please read more on the documentation https://developer.wordpress.org/reference/functions/wp_kses/
https://developer.wordpress.org/reference/functions/wp_kses_post/

September 29, 2022 at 6:16 PM #38479

Prabakaran Shankar

Participant

Hi, thank you for the above example. Could you please provide example for cloneable? For example, consider 'sub_text1' is the id of cloneable textarea field in the subgroup.

September 30, 2022 at 10:22 PM #38494

Long Nguyen

Moderator

Hi,

If the field sub_text1 is a cloneable field, so the value is an array of values. You can sanitize a specific element of the array via the key. For example

$sub_group = isset( $value['sub_group'] ) ? $value['sub_group'] : [];
$sub_text1 = $sub_group['sub_text1'];
if( !empty( $sub_text1 ) && is_array( $sub_text1 ) ){
    $value['sub_group']['sub_text1'][0] = wp_kses_post( $sub_text1[0] );
}

or this code if you want to sanitize all elements in the array

if( !empty( $sub_text1 ) && is_array( $sub_text1 ) ) {
    foreach ($sub_text1 as $key => $text_value) {
        $value['sub_group']['sub_text1'][$key] = wp_kses_post( $text_value );
    }
}

September 30, 2022 at 10:28 PM #38496

Prabakaran Shankar

Participant

Thank you so much.

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