Knockout驗證禁用驗證

Question

我有ko.observableArrays驗證項目。用戶可以將項目標記爲已刪除。當它被標記爲已刪除時，我需要禁用該項目的驗證。

如何動態禁用驗證？

例子：http://jsfiddle.net/3RZjT/2/

<div data-bind="foreach: names"> 
    <input data-bind="value: name, valueUpdate: 'afterkeydown'" /> <a data-bind="click: deleteMe, text:deleted()?'undelete':'delete'" href="#">delete</a><br/> 
</div> 

function Person(name){ 
    var self = this; 
    self.name = ko.observable(name).extend({ required: true}); 
    self.deleted = ko.observable(false); 
    self.deleteMe = function(){ 
     self.deleted(!self.deleted()); 
     self.deleted.extend({ validatable: !self.deleted()}); 
    }; 
} 

var viewModel = { 
    names: ko.observableArray([new Person("Ken"), new Person("")]) 
}; 

ko.applyBindings(viewModel); 

Answer 1

更新 舊的答案無效驗證的敲除的Contrib版本（這就是用積極的發展分支）

https://github.com/Knockout-Contrib/Knockout-Validation

使用onlyIf選項如

this.enable = ko.observable(true); 
this.required = ko.observable().extend({ required: { onlyIf: this.enable } }); 

老答案

嘗試

this.property.extend({ validatable: false }); // disables all validation for property 

或

this.property.extend({ required: false }); // disables required validation for property