想根据取值${monthlyuser.companyhydm}是否为空判断是否隐藏功能按钮，无法实现

Question

<c:if test="${not empty monthlyuser.companyhydm } "><input id="companyhydm" style="width:180px" type="text" name="companyhydm" class="inputText" value="${monthlyuser.companyhydm} " readonly="true"><c:if>