主题：要先选择国家下面品牌才有内容，有没有办法一进入网页如果国家有内容品牌就有对应的内容

Select Case e.Path
    Case "test.htm"
        Dim wb As New weui
        wb.AddForm("","form1","test.htm")
        With wb.AddInputGroup("form1","ipg1","动态列表")
            With .AddSelect("国家","国家","|[中国]|德国|日本")
                .Attribute = "2">品牌','getBrands.htm','国家',false)"""
            End With
            .AddSelect("品牌","品牌","")
        End With
        With wb.AddButtonGroup("form1","btg1",True)
            .Add("btn1", "确定", "submit")
        End With
        e.WriteString(wb.Build) '生成网页
    Case  "getBrands.htm"
        Dim pps As String = DataTables("汽车").GetComboListString("品牌","国家='" & e.PostValues("国家") & "'")
        e.WriteString(pps)
End Select

要先选择国家下面品牌才有内容，有没有办法一进入网页如果国家有内容品牌就有对应的内容