Meta Box Group

Meta Box Group helps you to organize custom fields into repeatable and collapsible groups. You can use this extension to group similar fields into one group to create hierarchy. You can clone the whole group, or sub-group. There's no limitation on the nesting level.

Tutorial

If this is the first time you use Meta Box Group, please follow the beginner tutorial here:

How to Create a Group of Custom Fields with Meta Box Group

The documentation below is like a detailed reference that you can use anytime you want to look for something in Meta Box Group.

Settings

The Meta Box Group adds a new field type group. This field type has following settings:

Name	Description
name	Field name (label), same like other normal fields. Optional.
id	Field ID, will be used to store custom field values of all sub-field.
type	Must be group
fields	Array of sub-fields. Each sub-field is declared as a normal field.
clone	Is the group clonable?
sort_clone	Can clones be sorted? true or false. If true, you can drag and drop group clones to reorder them.
collapsible	Make group collapsible? true or false. Default false. Optional.
save_state	Whether or not save the collapse/expand state? true or false. Default false. Optional.
default_state	Is the group collapsed or expanded by default (when page loads)? collapsed or expanded (default).
group_title	The title of collapsible group. See section collapsible groups for details.

So, to add a group, you need to add a field with type group and list of sub-fields in its fields attribute, like this:

$meta_boxes[] = array(
    'title'  => 'Meta Box Title',
    'fields' => array(
        array(
            'name'   => 'Group', // Optional
            'id'     => 'group_id',
            'type'   => 'group',
            // List of sub-fields
            'fields' => array(
                array(
                    'name' => 'Text',
                    'id'   => 'text',
                    'type' => 'text',
                ),
                // Other sub-fields here
            ),
        ),
    ),
);

Sample code

The code below creates a group for tracks in an album, each track is a group and is clonable (see screenshot below):

add_filter( 'rwmb_meta_boxes', 'meta_box_group_demo_register' );
function meta_box_group_demo_register( $meta_boxes ) {
    $meta_boxes[] = array(
        'title'  => 'Album Tracks',
        'fields' => array(
            array(
                'id'     => 'standard',
                // Group field
                'type'   => 'group',
                // Clone whole group?
                'clone'  => true,
                // Drag and drop clones to reorder them?
                'sort_clone' => true,
                // Sub-fields
                'fields' => array(
                    array(
                        'name' => 'Track name',
                        'id'   => 'text',
                        'type' => 'text',
                    ),
                    array(
                        'name' => 'Release Date',
                        'id'   => 'date',
                        'type' => 'date',
                    ),
                    array(
                        'name'    => 'Genre',
                        'id'      => 'genre',
                        'type'    => 'select_advanced',
                        'options' => array(
                            'pop'  => 'Pop',
                            'rock' => 'Rock',
                        ),
                    ),
                ),
            ),
        ),
    );
    return $meta_boxes;
}

Here is how it appears:

Nested groups

To add nested groups to a group, register a new field with type group and add subfields to it. Here is an example:

add_filter( 'rwmb_meta_boxes', 'demo_nested_groups' );
function demo_nested_groups( $meta_boxes ) {
    $meta_boxes[] = array(
        'title'  => 'Multi-level nested groups',
        'fields' => array(
            array(
                'id'     => 'group',
                'type'   => 'group',
                'clone'  => true,
                'fields' => array(
                    // Normal field (cloned)
                    array(
                        'name'  => 'Text',
                        'id'    => 'text',
                        'type'  => 'text',
                        'clone' => true,
                    ),
                    // Nested group level 2
                    array(
                        'name'   => 'Sub group',
                        'id'     => 'sub_group',
                        'type'   => 'group',
                        'clone'  => true,
                        'fields' => array(
                            // Normal field (cloned)
                            array(
                                'name'  => 'Sub text',
                                'id'    => 'sub_text',
                                'type'  => 'text',
                                'clone' => true,
                            ),
                        ),
                    ),
                ),
            ),
        ),
    );
    return $meta_boxes;
}

Result:

The plugin supports unlimited nesting levels.

Collapsible groups

To make a group collapsible, you need to set the settings 'collapsible' => true. The collapsible group also has the following settings:

Name	Description
save_state	Whether or not save the collapse/expand state? true or false. Default false. Optional.
default_state	Is the group collapsed or expanded by default (when page loads)? collapsed or expanded (default).
group_title	The title of collapsible group.

The group_title settings can show static text, the group index (if group is cloneable), sub-field value or any combination of them. To do that, set a group_title as a text and use the following format:

'group_title' => 'Static text {#} {sub_field_1} {sub_field_2}',

To specify the group index, use {#}. To specify a sub field value, use {sub_field_id}. You can add as many sub fields as you want and mix them in any way.

This is an example of a collapsible group:

add_filter( 'rwmb_meta_boxes', function ( $meta_boxes ) {
    $meta_boxes[] = array(
        'title'      => 'Company Branches',
        'post_types' => 'page',
        'fields'     => array(
            array(
                'id'          => 'g1',
                'name'        => 'Branches',
                'type'        => 'group',
                'clone'       => true,
                'sort_clone'  => true,
                'collapsible' => true,
                'group_title' => array( 'field' => 'name' ), // ID of the subfield
                'save_state' => true,

                'fields' => array(
                    array(
                        'name' => 'Name',
                        'id'   => 'name',
                        'type' => 'text',
                    ),
                    array(
                        'name' => 'Address',
                        'id'   => 'address',
                        'type' => 'text',
                    ),
                    array(
                        'id'          => 'contacts',
                        'type'        => 'group',
                        'clone'       => true,
                        'collapsible' => true,
                        'save_state'  => true,
                        'group_title' => '{person}',
                        'fields'      => array(
                            array(
                                'id'   => 'person',
                                'type' => 'text',
                                'name' => 'Person',
                            ),
                            array(
                                'id'   => 'phone',
                                'type' => 'text',
                                'name' => 'Phone',
                            ),
                        ),
                    ),
                ),
            ),
        ),
    );

    return $meta_boxes;
} );

Getting sub-field values

To get sub-field value, you need to get meta value of the group. This is done with following code:

$group_value = rwmb_meta( 'group_id' );

The returned value is associated array of sub-fields' values with keys are sub-fields IDs, like this:

array(
    'sub_field_1_key' => 'sub_field_1_value',
    'sub_field_2_key' => 'sub_field_2_value',
    'sub_field_3_key' => 'sub_field_3_value',
    //...
)

So, to get value of a sub-field, use the following code:

$value = isset( $group_value[$sub_field_key] ) ? $group_value[$sub_field_key] : '';
echo $value; // Display sub-field value

If the group is cloneable, then the value returned by rwmb_meta is array of group values, each group value is an array of sub-fields' values:

array(
    array(
        'sub_field_1_key' => 'sub_field_1_value',
        'sub_field_2_key' => 'sub_field_2_value',
        'sub_field_3_key' => 'sub_field_3_value',
        //...
    ),
    array(
        'sub_field_1_key' => 'sub_field_1_value',
        'sub_field_2_key' => 'sub_field_2_value',
        'sub_field_3_key' => 'sub_field_3_value',
        //...
    ),
    //...
)

To output values of cloneable groups, use the following code:

$group_values = rwmb_meta( 'group_id' );
if ( ! empty( $group_values ) ) {
    foreach ( $group_values as $group_value ) {
        $value = isset( $group_value[$sub_field_key] ) ? $group_value[$sub_field_key] : '';
        echo $value; // Display sub-field value
    }
}

Examples

This sample code registers a group of fields: contact name, contact email, contact phone number:

add_filter( 'rwmb_meta_boxes', 'prefix_register_contacts' );
function prefix_register_contacts( $meta_boxes ) {
    $meta_boxes[] = array(
        'title' => 'Contacts',
        'post_types' => 'post',
        'fields' => array(
            array(
                'id' => 'contacts',
                'type' => 'group',
                'clone' => true,
                'fields' => array(
                    array(
                        'id' => 'name',
                        'type' => 'text',
                        'name' => 'Name',
                    ),
                    array(
                        'id' => 'email',
                        'type' => 'text',
                        'name' => 'Email',
                    ),
                    array(
                        'id' => 'phone',
                        'type' => 'text',
                        'name' => 'Phone',
                    ),
                ),
            ),
        ),
    );
    return $meta_boxes;
}

In the single.php, you can add the following code to display contacts:

$contacts = rwmb_meta( 'contacts' );
if ( ! empty( $contacts ) ) {
    foreach ( $contacts as $contact ) {
        echo '<div class="contact">';
        echo '<h4>', 'Contact info', '</h4>';
        echo '<p><label>', 'Name:', '<label> ', $contact['name'], '</p>';
        echo '<p><label>', 'Email:', '<label> ', $contact['email'], '</p>';
        echo '<p><label>', 'Phone number:', '<label> ', $contact['phone'], '</p>';
        echo '</div>';
    }
}

This is another more advanced example with nested group:

Group field declaration:

array(
    'id'     => 'sector',
    'type'   => 'group',
    'clone'  => true,
    'fields' => array(
        array(
            'name' => 'Title',
            'id'   => 'sector-title',
            'type' => 'text',
        ),
        // Group nested
        array(
            'id'     => 'sector-object',
            'type'   => 'group',
            'clone'  => true,
            'fields' => array(
                array(
                    'name' => 'Images',
                    'id'   => 'sector-object-img',
                    'type' => 'image_advanced',
                ),
                array(
                    'name' => 'Description',
                    'id'   => 'sector-object-description',
                    'type' => 'textarea',
                ),
            ),
        ),
    ),
),

How to get value and output in the frontend:

// Requires PHP 7+.
$sectors = rwmb_meta( 'sector' );
$sectors = $sectors ?? [];
foreach ( $sectors as $sector ) {
    echo $sector['sector-title'] ?? '';

    $objects = $sector['sector-object'] ?? [];
    foreach ( $objects as $object ) {
        $imgs = $object['sector-object-img'] ?? : [];
        foreach ( $imgs as $img ) {
            echo '<img src="' . wp_get_attachment_image_url( $img, 'your_image_size' ) . '">';
        }
        echo $object['sector-object-description'] ?? '';
    }
}

Outputing group with page builders

If you want to output a group in a page builder like Beaver Builder or Elementor, please understand that there's no way to output each sub-field in a group as a element in these page builders.

In order to display group value, the recommended way is creating a view or a shortcode to display the group. Then you can insert the view/shortcode anywhere with the page builder.

Here is an example of a custom shortcode for a group with 3 fields: title (text), images (image_advanced) and description (wysiwyg). You can use it as a start:

// Requires PHP 7+.
add_shortcode( 'my_group', function() {
    $group = rwmb_meta( 'group_field_id' );
    if ( empty( $group ) ) {
        return '';
    }

    $output = '';

    // Sub-field title.
    $title = $group['title'] ?? '';
    $output .= '<h3 class="my-title">' . $title . '</h3>';

    // Sub-field image_advanced.
    $image_ids = $group['images'] ?? [];
    if ( $image_ids ) {
        $output .= '<div class="my-images">';
        foreach ( $image_ids as $image_id ) {
            $image = RWMB_Image_Field::file_info( $image_id, ['size' => 'my-image-size'] );
            $output .= '<img src="' . $image['url'] . '">';
        }
        $output .= '</div>';
    }

    // Sub-field description.
    $desc = $group['desc'] ?? '';
    $output .= '<div class="my-description">' . wpautop( $desc ). '</div>';

    return $output;
} );

// Usage: put [my_group] into your post content or page builder modules.

Sub-field values

It's important to note that the helper function returns only raw array of sub-field values. It doesn't transform value to meaning full details like rwmb_meta function for specific fields. Specifically:

Sub-field type	Value
taxonomy_advanced, user, post	Object ID(s)
file, file_advanced, file_upload, image, image_advanced, image_upload, single_image	Attachment ID(s)
map, osm	Text in format "latitude,longitude,zoom"
oembed	URL

To get more details for fields, you might need to add some extra code as below.

$group = rwmb_meta( 'group_id' );
$image_ids = $group['image_key'] ?? : [];
foreach ( $image_ids as $image_id ) {
    $image = RWMB_Image_Field::file_info( $image_id, ['size' => 'thumbnail'] );
    echo '<img src="' . $image['url'] . '">';
}

These are some helper functions that you can use to retrieve more info:

Field type	Helper function(s)
image, image_advanced, plupload_image, thickbox_image	wp_get_attachment_image_src()
-	wp_get_attachment_image_url()
-	RWMB_Image_Field::file_info( $image_id, $args ); (where $args is an array and accepts only size attribute)
file, file_advanced	get_attached_file()
-	RWMB_File_Field::file_info( $image_id );
oembed	RWMB_OEmbed_Field::get_embed( $url );
taxonomy, taxonomy_advanced	get_term()
user	get_userdata()
post	get_post()

Read more on how field values are saved into the database.

Setting default group values

There are 2 ways to set default group values: per sub-field or for the whole group.

Setting default values for each sub-fields is very simple. Just set its value via std parameter for each sub-field and done.

Example:

add_filter( 'rwmb_meta_boxes', function( $meta_boxes ) {
    $meta_boxes[] = [
        'title' => 'Test Group Default Value',
        'fields' => [
            [
                'type' => 'group',
                'id'   => 'group',
                'fields' => [
                    [
                        'type' => 'text',
                        'id' => 'name',
                        'name' => 'Name',
                        'std' => 'My Name', // THIS
                    ],
                    [
                        'type' => 'email',
                        'id' => 'email',
                        'name' => 'Email',
                        'std' => 'myemail@domain.com', // THIS
                    ],
                ],
            ]
        ],
    ];
    return $meta_boxes;
} );

Result:

However, doing that way makes you type quite a lot. And you hardly see the data of the whole group. To avoid this problem, Meta Box Group provides a better way to set default value for the whole group.

The idea is very simple, just use the same std parameter for the group (not for sub-fields). And set its value an array of sub-field default values.

For example: with a group of 2 fields above, we can default the default value like this:

add_filter( 'rwmb_meta_boxes', function( $meta_boxes ) {
    $meta_boxes[] = [
        'title' => 'Test Meta Box',
        'fields' => [
            [
                'type' => 'group',
                'id'   => 'group',
                'fields' => [
                    [
                        'type' => 'text',
                        'id' => 'name',
                        'name' => 'Name',
                    ],
                    [
                        'type' => 'email',
                        'id' => 'email',
                        'name' => 'Email',
                    ],
                ],

                // THIS
                'std' => [
                    'name' => 'My name',
                    'email' => 'myemail@domain.com',
                ],
            ]
        ],
    ];
    return $meta_boxes;
} );

If the group is cloneable, the std value should be an array of clone values. Each clone value is an array of sub-field values. Like this:

add_filter( 'rwmb_meta_boxes', function( $meta_boxes ) {
    $meta_boxes[] = [
        'title' => 'Test Meta Box',
        'fields' => [
            [
                'type' => 'group',
                'id'   => 'group',
                'name' => 'Group',
                'clone' => true,
                'collapsible' => true,
                'group_title' => '{name}',
                'fields' => [
                    [
                        'type' => 'text',
                        'id' => 'name',
                        'name' => 'Name',
                    ],
                    [
                        'type' => 'email',
                        'id' => 'email',
                        'name' => 'Email',
                    ],
                ],
                'std' => [
                    // Value for the 1st clone
                    [
                        'name' => 'Name 1',
                        'email' => 'email1@domain.com',
                    ],

                    // Value for the 2nd clone
                    [
                        'name' => 'Name 2',
                        'email' => 'email2@domain.com',
                    ]
                ],
            ]
        ],
    ];
    return $meta_boxes;
} );

And here is the result:

See this video for demonstration:

Changing clone button text

To change the clone button text, set use the add_button parameter like below:

[
    'type' => 'group',
    'name' => 'Tracks',
    'id' => 'tracks',
    'add_button' => 'Add another track',
    'fields' => [
        // Sub-fields here.
    ],
],

Clone default values

When clone a group, if the group has clone_default set to true, then all sub-fields will have their default values. The exception is if a sub-field is cloneable, then its clone_default will take the higher priority and comes to effect. In this case, the sub-field clone_default is used, no matter the settings of the outer group.

Learn more about clone_default parameter.

Known issues

• When cloning fields or groups, id attribute of inputs are adjusted. In multi-level nested groups, they're changed without any rule. So please don't rely on them to perform custom JavaScript actions.
• If you have a wysiwyg field in a cloneable group, please set its ID not ended with _{number} (e.g. _12). This format is reserved by the clone script to update the editor ID/name. Please just change the ID to another format.