Javascript Retrieve DOM element according to the number of its children

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I need some help on the following:

I want to get the DOM elements that have more than 5 children and add a class name to only those elements. For example,

<div class="parent">
    <span>child</span>
    <span>child</span>
    <span>child</span>
</div>

<div class="parent">
    <span>child</span>
    <span>child</span>
    <span>child</span>
    <span>child</span>
    <span>child</span>
    <span>child</span>
</div>

<div class="parent">
    <span>child</span>
    <span>child</span>
</div>

In this case I’d like to add a class name to the second div above that has 6 children spans.

I’ve tried the following:

const parents = document.querySelector(".parent");

if (parents.childElementCount > 5) {
    parents.classList.add('.reduce-size');
}

But no luck.

Please help.

Thanks!

11 thoughts on “Javascript Retrieve DOM element according to the number of its children”

  1. You have 3 div with the class parent. So I think you have to use a querySelectorAll(‘.parent’) and a loop after. Someting like this maybe

    const parents = document.querySelectorAll(".parent");
for (let i = 0; i < parents.length; i++) {
  if (parents[i].childElementCount > 5) {
  cityLocationTitle.classList.add('.reduce-size');
}
}
    Reply 
  2.   const parents = document.querySelectorAll(".parent");

parents.forEach(el => {
 if(el.childNodes.length > 5){
   el.classList.add('.reduce-size');
 }
});
    Reply

  3. Your snippet will work for only one div. parents variable will store an array of all DOMs with class='parent' and you’ll need to loop over it:

    $('.parent').each(function(){
        // your code snippet
 });
    Reply

  4. querySelector only returns the first matching element. You need to use querySelectorAll together with a loop:

    const parents = document.querySelectorAll(".parent");

for (let parent of parents) {
  if (parent.childElementCount > 5) {
      console.log("do stuff here");
  }
}
    <div class="parent">
    <span>child</span>
    <span>child</span>
    <span>child</span>
</div>

<div class="parent">
    <span>child</span>
    <span>child</span>
    <span>child</span>
    <span>child</span>
    <span>child</span>
    <span>child</span>
</div>

<div class="parent">
    <span>child</span>
    <span>child</span>
</div>
    Reply

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