如何访问按钮的 aria-expanded 值

Question

How can I access button properties from click listener? I want to access aria-expanded to set some values; here is what I got.

x.html

<button class="btn btn-secondary" (click)="customSearch($event.target)" type="button" data-toggle="collapse" data-target="#collapseForm" aria-expanded="false" aria-controls="collapseForm">Search</button>

x.ts

  customSearch(e){
    console.log("some event--->",e);
  }

result

Answer 1

As you are already passing the dom object as parameter you could directly get its attribute using getAttribute method

 customSearch(buttonDOM) { console.log("some event--->", buttonDOM.getAttribute('aria-expanded')); }

Answer 2

I recommend you to create a directive that modifies your button this is an example

import { Directive, ElementRef, Renderer, HostListener } from '@angular/core';
@Directive({
    selector: '[aextended]'
})
export class AextendedDirective {
    constructor(private el: ElementRef, private renderer: Renderer) {

    }
    @HostListener('click') onClick() {
     this.el.nativeElement.setAttribute('aria-expanded','true');
    }
}

and then in your template

<button aextended class="btn btn-secondary" (click)="customSearch($event.target)" type="button" data-toggle="collapse" data-target="#collapseForm" aria-expanded="true" aria-controls="collapseForm">Search</button>

this is a stackblitz of a working case

if you really want to set it from controller you can do this

  customSearch(el){
    el.setAttribute('aria-expanded','true')
  }