browser/src/angular/directives/a11y-title.directive.ts

import {
    Directive,
    ElementRef,
    Input,
    Renderer2,
} from '@angular/core';

@Directive({
    selector: '[appA11yTitle]',
})
export class A11yTitleDirective {
    @Input() set appA11yTitle(title: string) {
        this.title = title;
    }

    private title: string;

    constructor(private el: ElementRef, private renderer: Renderer2) { }

    ngOnInit() {
        if (!this.el.nativeElement.hasAttribute('title')) {
            this.renderer.setAttribute(this.el.nativeElement, 'title', this.title);
        }
        if (!this.el.nativeElement.hasAttribute('aria-label')) {
            this.renderer.setAttribute(this.el.nativeElement, 'aria-label', this.title);
        }
    }
}