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Vanilla JS equivalent for counting number of child elements using className

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August 10, 2019🍿 1 min readEdit this post on Github

This is part 2 of 2 in my series on "You don't need jQuery"

Sometimes, we learn lot of bigger things but miss on small learnings. I want to create small posts on vanilla JS to do things without libraries or frameworks on simple pages.

It is very easy to count number of elements using jquery. First we will see it in jQuery and then on vanilla JS.

<ul>
  <li class="li-node">Children 1</li>
  <li class="li-node">Children 2</li>
  <li class="li-node">Children 3</li>
  <li class="li-node">Children 4</li>
  <li class="li-node">Children 5</li>
</ul>

Count using jQuery

$('.li-node').length;

Count using Vanilla JS

document.querySelectorAll('.li-node').length;

document.querySelectorAll select all the elements with class name and returns an array of html element, then we can use the array length property to find the count.

Hope you learned a simple trick in vanilla JS 😎

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