How to target a specific index of cloned fields with Metabox Group

This topic has 3 replies, 2 voices, and was last updated 8 months ago by Peter.

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April 1, 2024 at 11:33 PM #45099
Codog
Participant
Hi there,
I have a frontend submission form that allows users to "Clone" a group of fields (up to X3). The cloned groups of fields are saved in the database as serialized data. All works fine.

The Problem
============
I have created a callback function that successfully passes some data to a hidden field within the cloned groups (for another purpose). However, this data is logically captured (stored) within "ALL cloned groups"? How do I "target a specific clone" created by a user via PHP in my function? I was assuming by it's index in the database, but I cannot seem to get the syntax right for the job?

Example:
```
// Clone #0
[0] => Array
(
    [hidden_field] => null
    [another_field] => data
    [another_field] => data
    etc....
)
// Clone #1
[1] => Array // How would I target this clone ONLY via a PHP conditional check?
(
    [hidden_field] => callback function data
    [another_field] => data
    [another_field] => data
    etc....
)

// Clone #2
[1] => Array 
(
    [hidden_field] => null
    [another_field] => data
    [another_field] => data
    etc....
)
```
Any help appreciated 🙂

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April 2, 2024 at 10:17 PM #45112
Peter
Moderator
Hello,

You can create a loop to iterate through the cloneable group value and check the key to update the hidden field of a specific clone group. For example:
```
$group_values = rwmb_meta( 'group_id' ) ?: [];
foreach ( $group_values as $group_key => $group_value ) {
	if ( $group_key == 1 ) {
		$group_value[1]['hidden_field'] = 'something';
	}
}
```
Following the documentation https://docs.metabox.io/extensions/meta-box-group/#sub-field-values

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April 4, 2024 at 2:20 AM #45131
Codog
Participant
Hi Peter,
thanks for your guidance 🙂 Unfortunately your suggested method is not working for me right now? I tried a very simple implementation to see if I can target and output a simple message and update the hidden_field value within an individual clone.

My test function:
==================
```
function output_to_clone(){

	$post_id = $_GET['rwmb_frontend_field_post_id'];

	$group_values = get_post_meta($post_id, 'group_id', true); 

	$msg = '';

	foreach ( $group_values as $group_key => $group_value ) {
		if ( $group_key == 1 ) {
			$group_value[1]['hidden_field'] = 'Something New';
			$msg .= '<div class="alert alert-danger" role="alert">Group Key = '.$group_key.'</div>';
		} else {
			$msg .= '';
		}
	}
	return $msg;
}
```
Function output
================

Then within the cloneable group fields I just added the function call:
```
            [
                'id'                => 'group_id',
				'add_button'        => __( 'Add more', 'text-domain' ),
                'type'              => 'group', 
                'clone'             => true,     
                'sort_clone'        => true,     
				'group_title'       => 'Title {#}',
				'collapsible'       => true,
				'save_state'        => true, 
				'max_clone'         => 3,

                'fields'     => [
					[
						'id'   => 'hidden_field',
						'type' => 'hidden',
						'std'  => 'Hidden Value',
					],
                    [
						'before'           =>   output_to_clone(), // Function output
                        'name'             => __( 'Field One', 'text-domain' ),
						'desc'             => __( 'Add a unique name.', 'text-domain' ),
                        'id'               => 'field_one',
						'type'             => 'text',
                    ],
                    [
                        'name'             => __( 'Field Two', 'text-domain' ),
						'desc'             => __( 'Enter a unique reference.', 'text-domain' ),
                        'id'               => 'field_two',
                        'type'             => 'text',
						'required'       => true,
                    ],
                ],
            ],
```
Expected Test Outcome
=======================

1) The $group_key == 1 conditional check would output the $msg value for the individual clone that matches the key. All other clones would return an empty $msg.
2) The $group_key == 1 - hidden_field would be updated to "Something New".

Actual Test Outcome
=======================

1) The $group_key == 1 conditional check outputs the same $msg value for ALL cloned fields (IE: Group Key = 1).
2) The $group_key == 1 - hidden_field value is NOT updated.

I am obviously misunderstanding something here? Can you help me understand where I am going wrong? Thanks in advance 🙂

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April 5, 2024 at 4:50 PM #45151

Peter
Moderator

Hello,

What is the action/filter that you hook the callback function output_to_clone to? If you want to update the group field value, you can use the function update_post_meta()
Refer to this topic https://support.metabox.io/topic/add-cloneable-group-using-update_post_meta-whilst-preserving-existing-data/

If you cannot complete the task, we offer a customization service with an extra fee. Please submit this form with your details, our development team will get back to you soon.
https://metabox.io/contact/

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