问题
I know that in ng2 we have ComponentFactoryResolver that can resolve factories that we can apply to a ViewContainerRef.
But, is there something similar for directives? a way to instantiate them and apply them to the projected content from a component?
回答1:
No, directives can't be added or removed dynamically. They are only applied to HTML statically added to component templates.
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.
来源：https://stackoverflow.com/questions/39563547/how-to-instantiate-and-apply-directives-programmatically