A Basis for the space of weakly holomorphic Drinfeld modular forms of level $T$

In this article, we explicitly construct a canonical basis for the space of certain weakly holomorphic Drinfeld modular forms for ${\mathrm{\Gamma }}_0(T)$ (resp., for ${\mathrm{\Gamma }}_0^{+}(T)$) and compute the generating function satisfied by the basis elements. We also give an explicit expression for the action of the $\mathrm{\Theta }$-operator, which depends on the divisor of meromorphic Drinfeld modular forms.