[Help] Set Attribute with Button?

I'd like to have a button on my character sheet that sets a value to a known constant. I tried this: button type="roll" value='{{CombatPool2=0}}' name='reset' but it doesn't reset CombatPool2 to 0. It seems like this should be possible, I just cannot seem to figure out the syntax. Thanks!

I think buttons will only work for rolls on roll20. ;-( There's probably a much easier method, but... maybe use a checkbox or radio buttons for this and set up a boolean function. reset checkbox <input type="checkbox" name="attr_reset" value="1" /> or perhaps a couple radio buttons Total <input type="radio" name="attr_reset" value="1" checked/> <input type="radio" name="attr_reset" value="0" /> Reset You would need to introduce another attribute for user input <input type="number" name="CombatPool2-value" value="0" /> Then you could multiply another attribute's value by @{reset} <input type="number" name="CombatPool2" value="( (@{CombatPool2-value})*@{reset} )" />