使用计算值访问 Knockout 中父视图模型中的函数
我正在尝试使用在子视图模型内部的主视图模型中定义的函数。我创建了一个小提琴，我认为它应该展示我正在尝试做的事情，但无法正常工作此处< /a>.还有更好的方法来完成我正在做的事情吗？
I am trying to use a function that is defined in my main view model from inside a sub view model. I have created a fiddle that I think should demonstrate what I am trying to do and doesn't work correctly here. Also is there a better way to accomplish what I am doing?
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我认为您希望能够从子零件模型中查找父视图模型中的制造商列表。我改变了你的小提琴中的一些东西，并创建了一个新的东西来解决这个问题：
http://jsfiddle.net/johnpapa/dsZ76/
首先，
数据绑定属性在应该使用文本时却使用了值。标记还应该使用结束 p 标记。另外，您绑定到制造商属性，但这是返回的对象，因此它应该是manufacturer().name。在 JavaScript 中，我将“this”添加为计算的第二个参数。然后“this”成为所有者，因此您可以在计算函数内使用它来表示零件模型。然后我更改了执行查找的函数以进行相等性检查，而不是使用 stringStartsWith 。
getManaufacturers的定义已移至调用创建零件之前（因为零件模型会调用它）。最后，我将“self”传递给 Part 函数，它变成了父参数。这应该可以做到。
I think you wanted to be able to lookup the manufacturer list in the parent viewmodel from the child Part model. I changed a few things in your fiddle and created a new one that resolves this:
http://jsfiddle.net/johnpapa/dsZ76/
First, the
data-bindattributes were using value when they should have been using text. The<p>tags should also use a closing p tag. Also, you were binding to the manufacturer property, but that is the object being returned so it should have beenmanufacturer().name.In the JavaScript, I added "this" as the second parameter to the computed. "this" then becomes the owner so you can use it inside the computed function to represent the Part model. Then I changed your function that does the lookup to do an equality check instead of using
stringStartsWith. The definition for thegetManaufacturerswas moved before the call create the Parts (because the Parts models call it). Finally, I pass in "self" to the Part function, which turns into the parent parameter.This should do it.
约翰比我快:)我做了类似的改变。 http://jsfiddle.net/gurkavcu/qKFHB/
John is faster than me :) I made the similar changes. http://jsfiddle.net/gurkavcu/qKFHB/