KnockoutValidation 和条件要求规则 [英] KnockoutValidation and the conditional required rule

问题描述

我正在尝试将 KnockoutValidation 与条件语句一起使用.见下面的代码:

I am trying to use KnockoutValidation with conditional statements. See code below:

self.transactionType = ko.observable('Option1');

self.ConditionalField = ko.observable().extend({
  required: true, 
  onlyIf: self.transactionType = ="Option2"
});

不幸的是，这不起作用.我希望 ConditionalField 仅在 transactionType 具有值 'Option2' 时才需要.

Unfortunately this doesn't work. I want to have ConditionalField only required if transactionType has value 'Option2'.

在knockout.validation.js 中使用条件验证的最佳方法是什么?

What is the best way to use conditional validation with knockout.validation.js?

推荐答案

我已经解决了.

首先，我在定义了conditionalfield 之后，错误地声明了transactiontype.有效的最终代码如下所示:

First of all I made the mistake of declaring the transactiontype after I had defined the conditionalfield. The end code that works looks like this:

self.transactionType = ko.observable("Option1");

self.conditionalField = ko.observable().extend({
  required: {
    onlyIf: function () { 
      return self.transactionType () == "Option2";
    }
  }
});

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