Angular obscured the referencing pointer

Question

Angular obscured the referencing pointer

After updating Angular, I encountered issues with my code. Previously, the following code worked fine:

@Component({
  templateUrl: './some.component.html',
  styleUrls: ['./some.component.scss']
})
export class SomeComponent {
  ...
  public someMethod(): void {
    const defs = this.svg.select(function() {return this.parentNode; })
      .append('defs');
    ...
  }
  ...
}

However, now it is throwing two error messages:

'this' implicitly has type 'any' because it does not have a type annotation.
An outer value of 'this' is shadowed by this container.

Can anyone suggest the correct replacement for this line?

angular typescript d3.js

Answer 1

Answer №1

The resolution to this specific issue was quite intricate:

Updating the ES version
Upgrading D3js

This statement can be understood as:

this.svg.select(function(this:any) {return this.parentNode;})

Answer 2

The resolution to this specific issue was quite intricate:

Updating the ES version
Upgrading D3js

This statement can be understood as:

this.svg.select(function(this:any) {return this.parentNode;})

Answer 3

Answer №2

Consider trying an ES5 arrow function as an alternative. Arrow functions do not interfere with or replace this.

  public someMethod(): void {
    const defs = this.svg.select(() => this.parentNode)
      .append('defs');
    ...
  }

If that doesn't resolve the issue, use a different variable to return from within the function scope:

  public someMethod(): void {
    const myParentNode = this.parentNode;
    const defs = this.svg.select(() => myParentNode)
      .append('defs');
    ...
  }

Answer 4

Consider trying an ES5 arrow function as an alternative. Arrow functions do not interfere with or replace this.

  public someMethod(): void {
    const defs = this.svg.select(() => this.parentNode)
      .append('defs');
    ...
  }

If that doesn't resolve the issue, use a different variable to return from within the function scope:

  public someMethod(): void {
    const myParentNode = this.parentNode;
    const defs = this.svg.select(() => myParentNode)
      .append('defs');
    ...
  }

Answer 5

Answer №3

 function createDefs(): void {
    const parentNode = this.parentNode;
    const definitions = this.svg.select(parentNode)
      .append('defs');
  }

Alternatively

 function createDefs(): void {
    d3.select('svg')
      .append('defs');
  }

Answer 6

 function createDefs(): void {
    const parentNode = this.parentNode;
    const definitions = this.svg.select(parentNode)
      .append('defs');
  }

Alternatively

 function createDefs(): void {
    d3.select('svg')
      .append('defs');
  }

Angular obscured the referencing pointer

Answer №1

Answer №2

Answer №3

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