writeValueToProperty不可用 [英] writeValueToProperty isn't available

问题描述

我正在做一个自定义绑定，我的第一个版本要求databound属性是可观察的，但是我刚刚发布了该绑定的用户可能希望使用标准属性(如果他们不希望在收到通知时被通知值已更改).

I'm doing a custom binding, my first version required the databound property to be a observable, but I just released that users of the binding probably could want to use a standard property (If they are not interested in being notified when the value has changed).

为此，我研究了值绑定是如何实现的，并使用了

To support this I looked at how the value binding is implemented, and it uses

ko.jsonExpressionRewriting.writeValueToProperty

将值同时写入可观察值或标准属性.

to write values both to observables or standard properties.

这是一个内部ko命名空间，因此我无法从绑定中使用它，我应该如何调用此方法?

This is an internal ko namespace so i cant use it from my binding, how am I supposed to call this method?

修改: 我在github上有一个pull请求来解决这个问题 https://github.com/SteveSanderson/knockout/pull/806

edit: I have a pull request at github to fix this https://github.com/SteveSanderson/knockout/pull/806

推荐答案

Knockout在allBindingsAccessor中的结果对象中放置了一个函数，您可以使用该函数将其写入不可观察的模型值.

Knockout places a function in the resulting object from the allBindingsAccessor that you can use to write to a non-observable model value.

如果绑定被称为myBinding，则您的代码可能类似于:

If your binding was called myBinding, then your code might look like:

        if (ko.isObservable(modelValue)) {
            modelValue(valueToWrite);
        }                
        else { //non-observable
           allBindingsAccessor()._ko_property_writers.myBinding(valueToWrite);   
        } 

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