Reply To: Unique, pre-populated repeater fields

• benjibee

• March 19, 2018 at 11:02 pm

Alright, thanks for confirming this. I may get into some custom JavaScript at some point, but this particular field is mostly read-only, and for now can be set when saving the post.

For future readers, I ended up making the field read-only when set to null, and then hooking into update_value to generate unique values there. I set the placeholder text to “Automatically generated on save”. Not the most elegant solution, but it works!

function my_acf_generate_file_url($value, $post_id, $field) {

	if ($value == NULL) {
        
        // generate GUID unique to each row of the repeater and it's value
		$data = openssl_random_pseudo_bytes(16);
		$data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100
		$data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10
		$value = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
	}

	return $value;
}
add_filter('acf/update_value/key=field_xxxxxxxx', 'my_acf_generate_file_url', 10, 3);