Add attribute with renderer using a directive

Question

I want to achieve extending an HTML tag with an attribute but encapsulate this with an angular 2 component.

Let\'s assume the original markup using my Angular 2 componen

Answer 1

If I understood you right.. your idea is good, should work!

See this plunker: https://plnkr.co/edit/YctUpK9r9AqIk0D1qvgZ?p=preview

EDIT: updated to use Renderer2

import {Component, Directive, NgModule, ElementRef, Renderer2, ViewChild} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

@Directive({
  selector: '[foo]'
})
export class MyFancyDirective {

  constructor (private _elRef: ElementRef, private _renderer: Renderer2) { console.log('!'); }

  ngOnInit() {
    this._renderer.setAttribute(this._elRef.nativeElement, 'another-fancy-attribute', 'HERE I AM !!');
  }

}

@Component({
  selector: 'my-app',
  template: `
    

      
Hello {{name}}
    
  `,
})
export class App {

  @ViewChild('header', { static: true }) header: ElementRef;

  name:string;
  constructor() {
    this.name = 'Angular2'
  }

  headerClicked() {
    console.dir(this.header.nativeElement.attributes['another-fancy-attribute'].value);
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App, MyFancyDirective ],
  bootstrap: [ App ]
})
export class AppModule {}