Need a BUTTON that will increase the value of a number by 1. How do I code this in deluge?

Need a BUTTON that will increase the value of a number by 1. How do I code this in deluge?

Any assistance would be greatly appreciated. 

Say I have a shopping cart line item with a count value of 0. I would like a button to the right that increases the count by increments of 1.

Is this possible in deluge?

Thank you