聚合物.动态添加或删除观察者的方法 [英] Polymer. Way to dynamically add or remove observer

问题描述

有没有一种方法可以在元素初始化时添加或删除观察者? 我可以这样定义观察者:

Is there a way to add or remove observer not in the moment of element initing? I can define observer this way:

observers: ['dataChanged(data.*)']

我可以稍后删除此观察者，还是可以设置与该观察者不同的方式?

Can i remove this observer later or can I set this observer different way than that?

推荐答案

您可以通过以下方式轻松地动态添加观察者:

You can easily add an observer dynamically, either by:

this._addObserverEffect("property", observerFunction);

或

this._addComplexObserverEffect("dataChanged(data.*)");

拆卸比较困难，Polymer没有提供执行此操作的功能.尽管您可以在_propertyEffects数组中搜索它，但我不建议这样做.也许只需检查您的观察者功能是否仍应处于活动状态，然后返回即可.

Removing is harder and Polymer does not provide a function to do this. Although you could search for it in the _propertyEffects array, I wouldn't recommend it. Maybe just check in your observer function whether it should still be active, and return if not.

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