条件验证不适用于匿名淘汰赛验证规则

我的视图模型中有以下属性，它们使用淘汰验证，其中之一是自定义验证来检查密码匹配。

model.Password = ko.observable()
                  .extend({ required: { message: "Password is required.", 
                        params: true,
                        onlyIf: function () { return model.IsCredentialsRequired(); }}
                    });


model.ConfirmPassword = ko.observable().
                        extend({ validation: { validator: mustEqual,
                        message: 'Passwords do not match.',
                        params: model.Password,               
                        onlyIf: function () { return model.IsCredentialsRequired(); } }
                    });

自定义验证函数的代码

var mustEqual = function (val, other) {
                return val == other();
            };

我找到OnlyIf条件工作正常model.Password根据model.IsCredentialsRequired()但它不适合model.ConfirmPassword，有人可以帮助我为什么会发生这种情况吗？还有其他方法可以对自定义规则使用条件验证吗？

提前致谢

Knockout-validation 目前不支持匿名规则的“onlyIf”。但它支持自定义规则。因此，您可以创建自定义规则并使用 onlyIf ：

ko.validation.rules['confirmPasswordMatches'] = {
    validator: function (val, params) {
        var otherValue = params;
        return val === ko.validation.utils.getValue(otherValue);
    },
    message: 'Passwords do not match.',
};
ko.validation.registerExtenders();

function ViewModel() {
    var self = this;

    self.IsCredentialsRequired = ko.observable(true);

    self.Password = ko.observable()
        .extend({
            required: {
                message: "Password is required.",
                params: true,
                onlyIf: self.IsCredentialsRequired
            }
    });

    self.ConfirmPassword = ko.observable().
    extend({
            confirmPasswordMatches: {
            params: self.Password,
            onlyIf: self.IsCredentialsRequired
        }
    });

}

Fiddle: http://jsfiddle.net/delixfe/mFAEx/ http://jsfiddle.net/delixfe/mFAEx/