Is there a vanilla JS equivalent of jQuery .has()?

Question

What would be the vanilla JS equivalent of :has in this jQuery selector?

$('.main-container').children('.analytics:has(a)').not('#promo')

Within .main-container, I'm trying to select all .analytics elements without an id of "promo" that contain <a> tags.

What I've tried:

document.querySelectorAll('.main-container .analytics:not(#promo)')

This will give me close to what I want, but I still have to filter out those .analytics parents that do NOT have <a> tags.

What would be the best way to approach this using vanilla JS?

Answer 1

1. Query the document for using your desired selector, in this case: .analytics:not(#promo)
2. Convert the NodeList to an Array
3. Filter the array using the predicate: element => element.querySelector('your-selector')

element.querySelector('your-selector') will evaluate to null (which is falsey) if no child element is found

Generally as a function

function has(nodeList, selector) {
  return Array.from(nodeList).filter(e => e.querySelector(selector))
}

const nodeList = document.querySelectorAll('.main-container > .analytics:not(#promo)')

has(nodeList, 'a').forEach(e => e.style.background = "red")

<div class="main-container">
  <div class="analytics">
    <a>Should be red</a>
  </div>
  <div class="analytics">
    Should not be red
  </div>
  <div id="promo" class="analytics">
    <a>Should not be red</a>
  </div>
</div>

As a NodeList.prototype

NodeList.prototype.has = function(selector) {
  return Array.from(this).filter(e => e.querySelector(selector))
}

document
  .querySelectorAll('.main-container > .analytics:not(#promo)')
  .has('a')
  .forEach(e => e.style.background = 'red')

<div class="main-container">
  <div class="analytics">
    <a>Should be red</a>
  </div>
  <div class="analytics">
    Should not be red
  </div>
  <div id="promo" class="analytics">
    <a>Should not be red</a>
  </div>
</div>

Answer 2

You could select the <a> and then get their parentNodes:

var a = document.querySelectorAll('.main-container .analytics:not(#promo) a');
var yourElements = [];
for (var i = 0; i < a.length; i++) {
  yourElements.push(a[i].parentNode);
}

yourElements.forEach(e => e.style.background = "red");

<div class="main-container">
  <div class="analytics">
    <a>Should be red</a>
  </div>
  <div class="analytics">
    Should not be red
  </div>
  <div id="promo" class="analytics">
    <a>Schould not be red</a>
  </div>
</div>

EDIT: just noticed this only works if the <a> is a direct child of your wanted element.

Answer 3

There is no equivalent selector for :has, you'll have to use an initial selection and then filter them

var el = document.querySelectorAll('.main-container > .analytics:not(#promo)');
var res = [];
for (let x = 0; x < el.length; x++){
    if (el[x].querySelector('a')) res.push(el[x]);
}
//res has has the array of elements needed.