How to show old value in webui when user press NO button on popup button.

Hi Experts,

As per requirement I have created custom field with dropbox and with popup box to cofirm user decision if value from field changes.

Now on Popup when user press Yes then its Ok as no need to change the current value in the field.

but when user press the NO button I want to display the old value on Web UI so now I am able to catch the old value and pass it into the field at backend but I am not able to make the change on the web page.

Please reply if anyone have solution for it.

BR

Gaurav