Hi Pushkin!
The way to execute these requirements depends on what you’re trying to achieve.
Do you want to keep it in record once someone gets the ‘green value’?
Do you intend to change it back according to a certain logic?
Please elaborate on what you are trying to achieve in order for us to be able to assist you.
On another note, in this forum we do not support by giving code solution but rather with providing guidance and directing with articles and API’s.
If you need help in coding your site I suggest you to contact WixArena where you can get help from pro designers and developers.
Doron.