jQuery验证，如果出现错误如何运行自定义代码

Question

I want to check for validation on multiple fields in a form. If there are any errors whatsoever I want to run some custom jQuery to hide and show various elements.

I have the validation below, my question is how do I now check if there are errors to run my custom code?

$("#signupForm").validate({
        rules: {
            firstname: "required",
            lastname: "required",
            username: {
                required: true,
                minlength: 2
            },
            password: {
                required: true,
                minlength: 5
            },
            confirm_password: {
                required: true,
                minlength: 5,
                equalTo: "#password"
            },
            email: {
                required: true,
                email: true
            },
            topic: {
                required: "#newsletter:checked",
                minlength: 2
            },
            agree: "required"
        },

Answer 1

You can call the form() method after the validate :

if($('form')
      .validate(RULES)
      .form()){
    //put your code here
}

See the documentation for the Validator Object .