  We investigate the electroweak form factors and semileptonic decay rates of
pseudoscalar and vector mesons using the light-front constituent quark model.
Our method of analytic continuation in the Drell-Yan-West (q^+=q^0+q^3=0) frame
to obtain the weak form factors avoids the difficulty associated with the
contributions from the nonvalence quark-antiquark pair creation. This method
seems to provide a promising step forward to handle the exclusive processes in
the timelike region. Our calculation reveals that the zero mode contribution is
crucial to obtaining the correct values of the light-front current J^{-} in the
q^+=0 frame. Our numerical results are overall in a very good agreement with
the available exprimental data.
