ko.validation与多步骤向导样式模型

Question

我正在尝试将this answer转换为使用ko.validation。

我停留在获得下一个按钮，在模型的状态是有效的使，但我下面的代码是不正确评估：

self.modelIsValid = function() { 
     self.currentStep().model().isValid(); 
}; 

我目前被卡住，希望得到一些新鲜的眼光取看看。模型确认OK（显示错误消息），最后一步是使用控制下一个按钮的modelIsValid来验证每个模型。

A jsfiddle is here，以及下面的代码。

ko.validation.configure({ 
    insertMessages: false, 
    decorateElement: true, 
    errorElementClass: 'error' 
}); 

function Step(id, name, template, model) { 
    var self = this; 
    self.id = id; 
    self.name = ko.observable(name); 
    self.template = template; 
    self.model = ko.observable(model); 

    self.getTemplate = function() { 
     return self.template; 
    }; 
} 

function ViewModel(model) { 
    var self = this; 

    self.nameModel = ko.observable(new NameModel(model));  
    self.addressModel = ko.observable(new AddressModel(model)); 

    self.stepModels = ko.observableArray([ 
      new Step(1, "Step1", "nameTmpl", self.nameModel()), 
      new Step(2, "Step2", "addressTmpl", self.addressModel()), 
      new Step(3, "Confirmation", "confirmTmpl", {NameModel: self.nameModel(), AddressModel:self.addressModel()})]); 

    self.currentStep = ko.observable(self.stepModels()[0]); 

    self.currentIndex = ko.computed(function() { 
     return self.stepModels.indexOf(self.currentStep()); 
    }); 

    self.getTemplate = function(data) { 
     return self.currentStep().template(); 
    }; 

    self.canGoNext = ko.computed(function() { 
     return (self.currentIndex() < (self.stepModels().length - 1)); 
    });  

    self.modelIsValid = function() { 
     self.currentStep().model().isValid(); 
    }; 

    self.goNext = function() { 
     if (((self.currentIndex() < self.stepModels().length - 1) && ($('.validationMessage:visible').length <= 0))) { 
      self.currentStep(self.stepModels()[self.currentIndex() + 1]); 
     } 
    }; 

    self.canGoPrevious = ko.computed(function() { 
     return self.currentIndex() > 0; 
    }); 

    self.goPrevious = function() { 
     if ((self.currentIndex() > 0 && ($('.validationMessage:visible').length <= 0))) { 
      self.currentStep(self.stepModels()[self.currentIndex() - 1]); 
     } 
    }; 
} 

NameModel = function (model) { 
    var self = this; 

    //Observables 
    self.FirstName = ko.observable(model.FirstName).extend({ required: true }); 
    self.LastName = ko.observable(model.LastName).extend({ required: true }); 

    return self; 
}; 

AddressModel = function(model) { 
    var self = this; 

    //Observables 
    self.Address = ko.observable(model.Address).extend({ required: true });; 
    self.PostalCode = ko.observable(model.PostalCode).extend({ required: true });; 
    self.City = ko.observable(model.City).extend({ required: true });; 

    return self; 
}; 

    var viewModelFromServer = { 
     "FirstName": "John", 
     "LastName": "Doe", 
     "Address": "123 Main St", 
     "PostalCode": "53201", 
     "City": "Milwaukee" 
    }; 

ko.applyBindings(new ViewModel(viewModelFromServer)); 

编辑凯文的回答

最后的看法是没有显示，这竟然是因为没有验证组为视图定义的，所以改变了你modelIsValid功能如下：

self.modelIsValid = ko.computed(function() { 
    if (typeof(self.currentStep().model().isValid) != "undefined") { 
     return self.currentStep().model().isValid(); 
    } 
    else 
     return true; // no validation used for viewmodel, so just return true 
}); 

这似乎工作，虽然我非常喜欢JavaScript的新手！

Answer 1

你应用的验证规则在您的姓名和地址的模型个别观测，但你要使用分组功能，而无需显式地做分组中的每个型号：

NameModel = function (model) { 
    var self = this; 

    //Observables 
    self.FirstName = ko.observable(model.FirstName).extend({ required: true }); 
    self.LastName = ko.observable(model.LastName).extend({ required: true }); 

    ko.validation.group(self); 

    return self; 
}; 

也，你将需要modelIsValid一个计算观察到：

self.modelIsValid = ko.computed(function() { 
    return self.currentStep().model().isValid(); 
}); 

更新小提琴 - http://jsfiddle.net/jnTjW/4/