Is it possible to validate numeric fields using JavaScript in Next-Gen?

[CarlHolmes]

Hi @Quynh-Tram - The primary issue is a fundamental shift in how the User Interface (UI) is managed, moving from Imperative (jQuery/Knack Classic) to Declarative (React/Next Gen) programming.

In Classic, jQuery code directly modifies the Actual DOM, but the new Next Gen environment uses a Virtual DOM. React is designed to manage all structural updates efficiently through this Virtual DOM, and when your old jQuery code tries to make direct changes to the Actual DOM.

So, unfortunately the JavaScript code you use in Classic won’t work in Next Gen:

Upgrade to Next-gen

I’ve put together a list of FAQ’s that may be helpful for those of you who have access to Classic and Next-Gen, there’s also a version published here. Q: Do I have to migrate my Classic app to Next-Gen? A: No, you do not. Your Classic app and custom code will continue to work as they do today. There is no requirement or deadline to migrate to or start using Next-Gen! Q: Will my Classic custom code stop working? A: No. Your Classic custom code will continue to function normally when using the C…