Obtaining the component instance ('this') from a template

Question

Obtaining the component instance ('this') from a template

Imagine we are in a situation where we need to connect a child component property to the component instance itself within a template:

<child-component parent="???"></child-component1>

Is there a solution for this without having to create a specific property on the parent component, like so:

public thisInstance: ParentComponent = this;

and then use it like this:

<child-component parent="thisInstance"></child-component1>

Any thoughts on how to achieve this?

UPDATE 1: I am searching for a method that allows us to definitively assign a parent to a child component. This means if the child has multiple parents of the same component type at different hierarchy levels, we can accurately specify which one to use.

UPDATE 2: I am seeking an approach that does not constrain the type of parent that can be used with the child component. Therefore, I am unsure whether injecting a parent into the child's constructor using a base class (implemented by the parent) as a token would be effective.

angular typescript angular-components

Answer 1

Answer №1

If you want to connect HTML with #selector, give this a shot:

<child-component1 #mother [parent]="parent"></child-component1>

After that, in child-component1, declare parent as an @Input().

Answer 2

If you want to connect HTML with #selector, give this a shot:

<child-component1 #mother [parent]="parent"></child-component1>

After that, in child-component1, declare parent as an @Input().

Answer 3

Answer №2

If you want to inject a parent component inside the constructor of a child component, you can do so like this:

export class ChildComponent{
  constructor(private parent: ParentComponent){}
}

To handle updates in both components, you can create a service injectable class and set the parent component instance in the parent component's onInit() method. This same instance will then be used in the child component.

@Injectable()
export class Service {
  private compInstance;
  
  setComponentInstance(_instance) {
    this.compInstance = _instance;
  }
  
  getComponentInstance() {
    return this.compInstance;
  }
}

Parent Component:

export class Parent {
  constructor(private service: Service){
    this.service.setComponentInstance(this);
  }
}

Child Component:

this.service.getComponentInstance();

Answer 4

If you want to inject a parent component inside the constructor of a child component, you can do so like this:

export class ChildComponent{
  constructor(private parent: ParentComponent){}
}

To handle updates in both components, you can create a service injectable class and set the parent component instance in the parent component's onInit() method. This same instance will then be used in the child component.

@Injectable()
export class Service {
  private compInstance;
  
  setComponentInstance(_instance) {
    this.compInstance = _instance;
  }
  
  getComponentInstance() {
    return this.compInstance;
  }
}

Parent Component:

export class Parent {
  constructor(private service: Service){
    this.service.setComponentInstance(this);
  }
}

Child Component:

this.service.getComponentInstance();

Obtaining the component instance ('this') from a template

Answer №1

Answer №2

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