敲除验证禁用验证

Question

我有ko.observableArrays与验证的项目。用户可以将项目标记为已删除。当它被标记为已删除时，我需要禁用对该项目的验证。

如何动态禁用验证？

示例：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

更新旧答案对Knockout-Contrib版本的验证无效(这是积极开发的分支)

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

使用onlyIf选项，如

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

旧答案

试一试

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

或

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