I'm trying to disable the "continue" button in checkout when order total crosses 'X' dollars using an extension. not sure if we can do this via extension ideas?

What are you trying to do?

If the order total crosses a certain amount say 100$. I want to disable the continue button until user edits cart and makes the order total less than 100$ like I'm trying to place a restriction on maximum amount that can placed using credit card

I see. There are three parts to this: 1. Some configuration (probably with your payment processor) to disallow orders over $100. 2. Backend validation on the order that will prevent orders with values over $100 AND where credit card is used. 3. Frontend validation that will do the same AND show errors / prevent order submit when this is true. Specifically what you're talking about is events. You will need to tie a

beforeSubmit()

event on the Cart extensibility API component to show an error message about what went wrong (https://system.netsuite.com/help/helpcenter/en_US/APIs/SuiteCommerce/Extensibility/Frontend/Cart.html#event:beforeSubmit). I am not sure disabling the checkout button is good usability, but for that you would need to bind an event to submit button's view to disable it.

I'll give a try with the events. Thanks Steve

FYI http://developers.suitecommerce.com/events.html

That was greatly helpful. Thanks a lot Steve