SilverStripe Display Logic for ListboxField not working - php

Question

SilverStripe: v4
Module used: https://github.com/unclecheese/silverstripe-display-logic
Hello and good day!
I'm in the Security page (Lists of Members) and was trying to display a ListboxField upon a certain string or value is found on another ListboxField.
.
With The image above, I wanted to select or input in the Groups field the Sales Representative role, and once the Sales Representative is present in the Groups, that's the moment I shall display another field
Here's my code snippet
$codesList = Member::get()->column('Code');
$codes = ListboxField::create(
'AccountPurchases',
'Account Purchases',
$codesList);
$fields->insertAfter('DirectGroups', $codes);
$codes->displayIf("DirectGroups")->contains("Sales Representative");
But the problem is, no matter what I did (1: dev/build?flush=1, 2: refresh the page, 3: restart the app) the desired field named $codes still won't appear.
But if I'm applying it to a normal field like the FirstName (which is a simple TextField), it's working perfectly fine...
$codesList = Member::get()->column('Code');
$codes = ListboxField::create(
'AccountPurchases',
'Account Purchases',
$codesList);
$fields->insertAfter('DirectGroups', $codes);
$codes->displayIf("FirstName")->contains("Sales Representative");
Any ideas how to perform my desired output?

Answer 1

For non-standard form fields, you'll need to use the display-logic wrapper. https://github.com/unclecheese/silverstripe-display-logic#dealing-with-non-standard-form-fields
The definition of "non-standard" is a bit hard to find, but in my experience it's anything non-plain-html-input. Listbox is a fancy front-end thing, so it qualifies. The examples in the docs can be confusing, but if you are using SS4 and the latest display-logic, then use Wrapper::create instead of DisplayLogicWrapper::create. If you wrap it, it should work.
$codesList = Member::get()->column('Code');
$codes = Wrapper::create(
ListboxField::create('AccountPurchases','Account Purchases',$codesList);
)->displayIf("DirectGroups")->contains("Sales Representative")->end();
$fields->insertAfter('DirectGroups', $codes);