How to Fire Event As Soon As Reaching Max

[Behseini]

Can you please let me know how to update the code in way that can fire an event as soon as the spinner reaches the Max?

For example in this demo I need to console log the Max exactly when user reaches the Max not after second click

The reason that I want to do this is prompting error message for user after trying to pass the Max and if I set the Max to 21 it is already violated the rule and to 19 is still invalid because the 20 is valid number