As there’s no replacement for “List” component for the new Polaris web component for POS UI Extension, I have made a workaround using stack + scrollBox.
But there’s no method to detect when user has scrolled till the end of scroll box, to auto load more content from API and append to it.
I hope Shopify can consider adding “onEndReached()” function to Scroll box, or a way to detect when the end of the scroll area is reached, so that app can know and load more content when needed.
Hey @soulchild 
thanks for sharing this suggestion! I definitely see where you’re coming from
I’ve submitted your request for an end-of-scroll callback for consideration. I don’t have any confirmed plans or a timeline to share at this point, but I’ll follow up here if anything changes on that front.
Hey @soulchild, a quick update: we’re adding onEndReached support to Scroll box in the 2026-10 release, with rollout planned for October.
Thanks again for sharing this suggestion!
Hey all, there’s been a switch of direction. Soon there’ll be another component that will support that feature. Due to that, onEndReached support will not be added to the ScrollBox component.
Please look forward to that instead 