Required Field with Conditions

Hello!

I`m trying to set up the requirement condition of a page field. Using this article as example: https://academy.creatio.com/docs/8.x/dev/development-on-creatio-platform/platform-customization/freedom-ui/customize-page-fields/examples/set-up-the-requirement-condition-of-a-field

But I have no exp with JavaScript. So could u please help.

This part below not working properly :(

request: "crt.HandleViewModelAttributeChangeRequest",
        /* The custom implementation of the system request handler. */
        handler: async (request, next) => {
            /* Check the request status. */
            if (request.attributeName === 'PDS_AmountTest') {
                const newStatusId = 100000;
                const selectedStatus = await request.$context.PDS_AmountTest;
                const selectedStatusId = selectedStatus?.value;
                const isNewRequest = selectedStatusId === newStatusId;
              /* Check the request description. */
                if (isNewRequest) {
                    request.$context.enableAttributeValidator('AmountTest', 'required');
                } else {
                    request.$context.disableAttributeValidator('AmountTest', 'required');
                }
            }
            /* Call the next handler if it exists and return its result. */
            return next?.handle(request);
        }
    }