Janik von Rotz

1 min read

JS snippet: Set tallest height on siblings

This post is another contribution to “I hope that I never have to use jQuery again”. The problem solved this time is quite simple. We want to set the same height for a group of divs. So not like this:


If you’re not using any js library (other than jQuery of course) add this forEach function declaration to your js file.

var forEach = function (array, callback, scope) {
  for (var i = 0; i < array.length; i++) {
    callback.call(scope, i, array[i]); 

Now the snippet below solves our problem. It looks for the tallest divs and set its height to its siblings.

var collection = document.getElementsByClassName('collection')[0]
if(collection) {
    var boxes = collection.getElementsByClassName('box')
    var maxHeight = 0

    // get max height
    forEach(boxes, function (index, box) {
        if (box.offsetHeight >= maxHeight) {
            maxHeight = box.offsetHeight

    // set max height
    forEach(boxes, function (index, box) {
        box.style.height = `${maxHeight}px`

Simply set the class name of the parent element holding the divs and the class name of the divs.

Quite easy, isn’t it?

Categories: JavaScript development
Tags: function , javascript , no-jquery
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