How can I get the instance of host component for directive?

Question

Before ng9, I can get the instance by:

Inject the ViewContainerRef in constructor

constructor(private _viewContainerRef: ViewContainerRef) { }

and then get it using

let hostComponent = this._viewContainerRef["_data"].componentView.component;

But in ng9, there is no _data property in ViewContainerRef:

How can I do in ng9? Thanks!

Please extend the question with the following. Is this a component or a directive? What are you trying to achieve with the component reference? _data seems to be a private variable on the ViewContainerRef, why do you need to access it? — Alex Biro
– Alex Biro, Commented May 22, 2020 at 8:08

Eliseo · Accepted Answer · 2020-05-22 08:10:09Z

If your directive is applied to a unique kind of component, you can use in constructor

constructor(@Optional() @Host() private component:YourComponent){}

NOTE: You need "wait" to ngAfterViewInit to get the value of a variable in the component

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