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rwmb_{$field_id}_after_save_field for Image (multiple)

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  • August 28, 2025 at 4:27 AM #48844
    Roland Glenn WhiteheadRoland Glenn Whitehead
    Participant

    Hello,

    I'm trying to update the alt text as described here:

    https://metabox.io/add-alt-text-automatically/

    But I'm using the Image field type with max_file_uploads set to 10. I'd like to use the rwmb_{$field_id}_after_save_field hook (or similar) to update the alt text for each image as saved. This hook appears to return the $object_id for the post, rather than the specific image saved.

    Thanks in advance.

    $prefix = 'my_';
$meta_boxes[] = [
		'id'         => 'image_id',
		'title'      => __( 'My Image', 'my_plugin' ),
		'post_types' => ['my_cpt'],
		'context'    => 'normal',
		'priority'   => 'high',
		'fields'     => [
				[
					'id'               => $prefix . 'image',
					'type'             => 'image',
					'max_file_uploads' => 10,
					'force_delete'     => false
				],
		],
];
    August 28, 2025 at 9:42 AM #48845
    Roland Glenn WhiteheadRoland Glenn Whitehead
    Participant

    If anyone else would like to update the title & alt text from a dashed/underscored file name for an Image field with multiple images, this worked for me (in a class) pulled together from a few different examples:

    
add_action( 'rwmb_my_image_field_name_after_save_field', array( $this, 'image_title_alt' ), 10, 5 );
public function image_title_alt( $null, $field, $new, $old, $object_id ) {
	$images = rwmb_meta( 'my_image_field_name', array(), $object_id );
	foreach ( $images as $image ) {
		$title = $image['title'];
		$title = str_replace( array( '-', '_' ), ' ', $title );
		$title = ucwords( strtolower( $title ) );
		update_post_meta( $image['ID'], '_wp_attachment_image_alt', $title );
		wp_update_post(
			array(
				'ID'         => $image['ID'],
				'post_title' => $title,
			)
		);
	}
}

    Cheers.

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