Limit previous and next button functionality

raulvillares / 3sacrowd

Tic-Tac-Toe puzzle using plain javascript :video_game:

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Closed ngevan closed 7 years ago

ngevan commented 7 years ago

This PR:

prevents the previous level button from working when the player is on the first level.
prevents the next level button from working when the player is on the last level.

This is done by setting the button's disabled property to true if the condition is met.

This closes #7.