Angular Material's Material Button exhibits varying behavior when the text on the button is clicked

Question

Angular Material's Material Button exhibits varying behavior when the text on the button is clicked

Let's analyze the code snippet below:

HTML:

<button mat-flat-button id="test" (click)="toggle($event)">Click me!</button>

Component:

toggle(event) {
  let id: string = (event.target as Element).id;
  console.log(id)
  console.log(event.target)
}

When the button is clicked, it triggers the toggle function with the event as a parameter. The system will log "test" (id) and a button event.

However, pressing the text on the button will result in logging an undefined id and a span with the class mat-button-wrapper.

Question: How can I obtain the button event target when the text on the button is pressed instead of the span event target?

angular typescript angular-material

Answer 1

Answer №1

In the world of JavaScript, the click event follows a path where it originates from a source element and then moves up through the tree of ancestor elements - a process known as "bubbling up".

For example, in a DOM structure like this:

<button mat-flat-button>
    <span>Click me!</span>
</button>

When a click event occurs on the span, it will bubble up to the button before reaching the document root.

If you need to access the button element itself, you can utilize a Template Reference Variable and pass it to your event handler:

<button mat-flat-button id="test" #testButton (click)="toggle(testButton)">Click me!</button>

Answer 2

In the world of JavaScript, the click event follows a path where it originates from a source element and then moves up through the tree of ancestor elements - a process known as "bubbling up".

For example, in a DOM structure like this:

<button mat-flat-button>
    <span>Click me!</span>
</button>

When a click event occurs on the span, it will bubble up to the button before reaching the document root.

If you need to access the button element itself, you can utilize a Template Reference Variable and pass it to your event handler:

<button mat-flat-button id="test" #testButton (click)="toggle(testButton)">Click me!</button>

Answer 3

Answer №2

To directly pass the button element into the event handler, you can assign a template reference variable to the button like this:

<button mat-flat-button id="click-test" #btnElement (toggle)="toggle(btnElement._elementRef.nativeElement)">Click Me!</button>

toggle(btnElement) {
  console.log(btnElement.id);
}

Alternatively, you can access the event target and check if it is the button. If not, you can look at its parent elements:

toggle(event) {
  if (event.target instanceof HTMLButtonElement) {
    console.log(event.target.id);
  } else {
    console.log(event.target.parentElement.id);
  }
}

Answer 4

To directly pass the button element into the event handler, you can assign a template reference variable to the button like this:

<button mat-flat-button id="click-test" #btnElement (toggle)="toggle(btnElement._elementRef.nativeElement)">Click Me!</button>

toggle(btnElement) {
  console.log(btnElement.id);
}

Alternatively, you can access the event target and check if it is the button. If not, you can look at its parent elements:

toggle(event) {
  if (event.target instanceof HTMLButtonElement) {
    console.log(event.target.id);
  } else {
    console.log(event.target.parentElement.id);
  }
}

Angular Material's Material Button exhibits varying behavior when the text on the button is clicked

Answer №1

Answer №2

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