你可以这样创建一个简单的规则:

jQuery.validator.addMethod("greaterThanZero", function(value, element) {
    return this.optional(element) || (parseFloat(value) > 0);
}, "* Amount must be greater than zero");

然后像这样应用:

$('validatorElement').validate({
    rules : {
        amount : { greaterThanZero : true }
    }
});

只需更改'addMethod'的内容来验证您的复选框。

对于这种情况:用户注册表单，用户必须选择一个未采取的用户名。

这意味着我们必须创建一个自定义的验证规则，该规则将向远程服务器发送异步http请求。

在你的html中创建一个input元素:

<input name="user_name" type="text" >

声明表单验证规则:

  $("form").validate({
    rules: {
      'user_name': {
        //  here jquery validate will start a GET request, to 
        //  /interface/users/is_username_valid?user_name=<input_value>
        //  the response should be "raw text", with content "true" or "false" only
        remote: '/interface/users/is_username_valid'
      },
    },

远程代码应该像这样:

class Interface::UsersController < ActionController::Base
  def is_username_valid
    render :text => !User.exists?(:user_name => params[:user_name])
  end
end

你可以这样创建一个简单的规则:

jQuery.validator.addMethod("greaterThanZero", function(value, element) {
    return this.optional(element) || (parseFloat(value) > 0);
}, "* Amount must be greater than zero");

然后像这样应用:

$('validatorElement').validate({
    rules : {
        amount : { greaterThanZero : true }
    }
});

只需更改'addMethod'的内容来验证您的复选框。

谢谢，成功了!

这是最终的代码:

$.validator.addMethod("greaterThanZero", function(value, element) {
    var the_list_array = $("#some_form .super_item:checked");
    return the_list_array.length > 0;
}, "* Please check at least one check box");

$(document).ready(function(){
    var response;
    $.validator.addMethod(
        "uniqueUserName", 
        function(value, element) {
            $.ajax({
                type: "POST",
                url: "http://"+location.host+"/checkUser.php",
                data: "checkUsername="+value,
                dataType:"html",
                success: function(msg)
                {
                    //If username exists, set response to true
                    response = ( msg == 'true' ) ? true : false;
                }
             });
            return response;
        },
        "Username is Already Taken"
    );

    $("#regFormPart1").validate({
        username: {
            required: true,
            minlength: 8,
            uniqueUserName: true
        },
        messages: {
            username: {
                required: "Username is required",
                minlength: "Username must be at least 8 characters",
                uniqueUserName: "This Username is taken already"
            }
        }
    });
});

// add a method. calls one built-in method, too.
jQuery.validator.addMethod("optdate", function(value, element) {
        return jQuery.validator.methods['date'].call(
            this,value,element
        )||value==("0000/00/00");
    }, "Please enter a valid date."
);

// connect it to a css class
jQuery.validator.addClassRules({
    optdate : { optdate : true }    
});