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我有在线预约表格的多项选择选项值。我的项目就像这个项目 (显示基于先前下拉选择的第二个下拉列表)

当用户选择其他选项时,我有一些 jquery 代码来清除选项,事情是我将如何验证表单,我的意思是在二级选择选项值处选择了至少一个选择选项。

我尝试在验证 php 页面上使用此代码

else if ($appointment_gc == " " 
         || $appointment_fu == " " 
         || $appointment_gas == " " 
         || $appointment_col == " " 
         || $appointment_ent == " " 
         || $appointment_ort == " " 
         || $appointment_ps == " " 
         || $appointment_package == " " ) {
            echo "Submission fails. You have not choose any package. 
                  Please go back and try again.
                  <input style=\"padding:10px 20px;margin-top:20px;\" 
                  type=button value=\"Back\" onClick=\"history.go(-1)\">"; 
          exit();
} 

每个$appointment_...都是选择选项。我只想选择至少一个选择选项,但似乎无论如何都无法提交。

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