Create single element for calculated results?

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Not a question for coding, but I can’t figure out how to place an element on my ‘order’ page that displays the calculated balance a customer owes as they add priced items on this page.

It would look exactly like in an input text element, but would be read-only and be updated as users added items to a growing list of products selected for purchase. All of this happens on the same page as the user presses the ‘add’ button in response to selected items from a dropdown list.

Thanks,
Tom Lloyd

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I have no doubt how I can do the coding to update the element, but I DON’T know what element it is whose value I’m updating.

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