Possible to drag and drop pieces off the board? about chessground

[niklasf]

Dropping off the board is done via:

chessground/src/config.ts

Line 66 in f90358e

deleteOnDropOff?: boolean; // delete a piece when it is dropped off the board

To drag a new piece onto the board, a little bit of glue is needed, because the pocket is not part of chessground. Call

chessground/src/api.ts

Line 72 in f90358e

dragNewPiece(piece: cg.Piece, event: cg.MouchEvent, force?: boolean): void;

from the mousedown event handler of the pocket.

[niklasf]

For a new piece that's dragged in? Not directly, but you provide a callback

chessground/src/config.ts

Line 77 in f90358e

dropNewPiece?: (piece: cg.Piece, key: cg.Key) => void;

and reset the board state if needed. That's how lichess.org implements Crazyhouse drops.

For pieces that are already on the board, yes:

chessground/src/config.ts

Line 35 in f90358e

dests?: cg.Dests; // valid moves. {"a2" ["a3" "a4"] "b1" ["a3" "c3"]}

[AhsanSarwar45]

An even better example would be the crazyhouse variant in lichess. Is that done using in built features, or custom-made?

[AhsanSarwar45]

@niklasf Thank you, that worked. By any chance, is there a way to specify legal squares that the pieces can be dragged on to?