IE9中的JQuery验证将所有文本字段设置为必填字段？

Question

IE9中的Jquery验证将所有文本字段设置为必需。找不到为什么？ 在我的表单中，我有更多字段不需要。但是当我单击“提交”时，类错误将添加到包含“不需要”的所有文本字段中。

以下是我的规则：

$（document）.ready（function（）{

setFields();

var validator = $("#frmContact").validate({
        rules: {
            ddQuestions:"required",
            txtEmail: {
                required: true,
                email: true
            },
            txtName:{required: true, placeholder: true},
            txtPhone:'customphone',
            txtAddress: "required",
            txtCity:"required",
            ddStates:"required",
            txtMessage:"required",
            txtZipcode:{required:true,zipcodeUS:true},
        },
        messages: {
            captcha: "Correct captcha is required. Click the captcha to generate a new one",
            ddQuestions: "Please select a topic",
            txtName:{required:"Do not forget put your name", placeholder: "Do not forget put your name"},
            txtEmail:"Insert a valid email to be in contact",
            txtAddress:"Don't forget put your address",
            txtCity:"Please insert the city",
            ddStates:"Please select the state",
            txtMessage:"Don't forget put your message",
            txtZipcode:"Insert a valid zipcode",
        },
        ignore:":not(:visible)"
});