如何以编程方式实例化和应用指​​令? [英] How to instantiate and apply directives programmatically?

问题描述

我知道在 ng2 中我们有 ComponentFactoryResolver 可以解析我们可以应用到 ViewContainerRef 的工厂.

I know that in ng2 we have ComponentFactoryResolver that can resolve factories that we can apply to a ViewContainerRef.

但是，指令有类似的东西吗?一种将它们实例化并将它们应用到组件的投影内容的方法?

But, is there something similar for directives? a way to instantiate them and apply them to the projected content from a component?

推荐答案

不，不能动态添加或删除指令.它们仅适用于静态添加到组件模板的 HTML.

No, directives can't be added or removed dynamically. They are only applied to HTML statically added to component templates.

您可以做的是通过向指令传递参数 (@Input()) 来启用/禁用该指令，以通知它做某事或不做某事.

What you could do is to enable/disable the directive by passing a parameter (@Input()) to the directive to notify it to do something or not.

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