The ornamental design for a keyboard for electronicdevice, as shown and described.
FIG. 1 is a perspective view of a keyboard for electronic device showing the design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof; and,
FIG. 4 is a right side elevational view thereof.
The keypad design consists of the outermost solid line boundary and everything within. The broken line showing of the remainder of the handset is directed to environment and is for illustrative purposes only; the broken lines form no part of the claimed design.