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In JavaScript you add an event listener to a single element using this syntax:

document.querySelector('.my-element').addEventListener('click', event => {
  //handle click
})

But how can you attach the same event to multiple elements?

In other words, how to call addEventListener() on multiple elements at the same time?

You can do this in 2 ways. One is using a loop, the other is using event bubbling.

Using a loop

The loop is the simplest one conceptually.

You can call querySelectorAll() on all elements with a specific class, then use forEach() to iterate on them:

document.querySelectorAll('.some-class').forEach(item => {
  item.addEventListener('click', event => {
    //handle click
  }
})

If you don’t have a common class for your elements you can build an array on the fly:

[document.querySelector('.a-class'), document.querySelector('.another-class')].forEach(item => {
  item.addEventListener('click', event => {
    //handle click
  }
})

Using event bubbling

Another option is to rely on event bubbling and attach the event listener on the body element.

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The event is always managed by the most specific element, so you can immediately check if that’s one of the elements that should handle the event:

const element1 = document.querySelector('.a-class')
const element2 = document.querySelector('.another-class')

body.addEventListener('click', event => {
  if (event.target !== element1 && event.target !== element2) {
    return
  }
  //handle click
}