How to access host component from directive?

Question

Say I have the following markup:

Is there any way I can access the component instance

Answer 1

This is taken from the github issue and works like a charm. The downside is needing to know the components beforehand, but in your case you would need to know the methods you're using anyway.

import { Host, Self, Optional } from '@angular/core';

    constructor(
         @Host() @Self() @Optional() public hostCheckboxComponent : MdlCheckboxComponent
        ,@Host() @Self() @Optional() public hostSliderComponent   : MdlSliderComponent){
                if(this.hostCheckboxComponent) {
                       console.log("host is a checkbox");
                } else if(this.hostSliderComponent) {
                       console.log("host is a slider");
                }
         }

Credit: https://github.com/angular/angular/issues/8277#issuecomment-323678013