Dealing with event delegation on elements that are not nested

Working with Bootstrap group radio buttons where I need to implement event delegation.

<div class="btn-group" role="group" aria-label="Basic radio toggle button group">
  <input type="radio" class="btn-check" name="btnradio" id="btnradio1" autocomplete="off" checked>
  <label class="btn btn-outline-primary" for="btnradio1">Radio 1</label>

  <input type="radio" class="btn-check" name="btnradio" id="btnradio2" autocomplete="off">
  <label class="btn btn-outline-primary" for="btnradio2">Radio 2</label>

  <input type="radio" class="btn-check" name="btnradio" id="btnradio3" autocomplete="off">
  <label class="btn btn-outline-primary" for="btnradito3">Radio 3</label>
</div>

Encountering an issue as the labels are not directly nested within the input element.

event.target.closest('.btn-check');

Any suggestions on how to properly implement event delegation in this scenario?

javascriptbootstrap-5event-delegation

Answer №1

Follow this method: By clicking either the radio button or its corresponding label, you can display the ID. No need to use closest in this case, but if it matches the selector, closest will return the element itself.

This functionality also works in Bootstrap.

document.querySelector('.btn-group').addEventListener('click', (e) => {
  const tgt = e.target;
  if (tgt.matches('.btn-check')) console.log(tgt.id)
});
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ea8885859e999e988b9aaadfc4d8c4d9">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<div class="btn-group" role="group" aria-label="Basic radio toggle button group">
  <input type="radio" class="btn-check" name="btnradio" id="btnradio1" autocomplete="off" checked>
  <label class="btn btn-outline-primary" for="btnradio1">Radio 1</label>

  <input type="radio" class="btn-check" name="btnradio" id="btnradio2" autocomplete="off">
  <label class="btn btn-outline-primary" for="btnradio2">Radio 2</label>

  <input type="radio" class="btn-check" name="btnradio" id="btnradio3" autocomplete="off">
  <label class="btn btn-outline-primary" for="btnradio3">Radio 3</label>
</div>

If your buttons have child elements, using closest is necessary.

To display the ID, click on either the button text or the icon.

document.querySelector('.btn-group').addEventListener('click', (e) => {
  const tgt = e.target.closest('.btn'); // wouldn't work on the icon without closest
  if (tgt) console.log(tgt.id)
});
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="284a47475c5b5c5a4958681d061a061b">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css" integrity="sha512-z3gLpd7yknf1YoNbCzqRKc4qyor8gaKU1qmn+CShxbuBusANI9QpRohGBreCFkKxLhei6S9CQXFEbbKuqLg0DA==" crossorigin="anonymous" referrerpolicy="no-referrer" />

<div class="btn-group" role="group" aria-label="Basic button group">
  <button type="button" class="btn btn-outline-primary"  id="btn1">Text</button>
  <button type="button" class="btn btn-outline-primary"  id="btn2" ><i class="fa fa-exclamation-circle" aria-hidden="true"></i></button>
</div>

Answer №2

By utilizing the event delegation technique, I have set up a click event listener on the parent container with the class btn-group. When a click event is detected, the code checks if the clicked element is an <input> element with the type "radio". If it is, the code logs the ID of that element to the console.

  document.querySelector('.btn-group').addEventListener('click', (event) => {
    if (event.target.tagName === 'INPUT' && event.target.type === 'radio') {
      console.log(event.target.id);
    }
  });
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="27454848535453554657671209150914">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<div class="btn-group" role="group" aria-label="Basic radio toggle button group">
  <input type="radio" class="btn-check" name="btnradio" id="btnradio1" autocomplete="off" checked>
  <label class="btn btn-outline-primary" for="btnradio1">Radio 1</label>

  <input type="radio" class="btn-check" name="btnradio" id="btnradio2" autocomplete="off">
  <label class="btn btn-outline-primary" for="btnradio2">Radio 2</label>

  <input type="radio" class="btn-check" name="btnradio" id="btnradio3" autocomplete="off">
  <label class="btn btn-outline-primary" for="btnradio3">Radio 3</label>
</div>

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