JSFiddle - React, Tailwind, and code Playground

by LuckyCat

HTML

<div class="checkbox-block">
  <div class="checkbox-item tr-option">
    Test text 1
  </div>
  <div class="checkbox-item tr-option">
    Test text 2
  </div>
  <div class="checkbox-item tr-option">
    Test text 3
  </div>
  <div class="checkbox-item tr-option">
    Test text 4
  </div>
</div>

CSS

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:focus {
  outline: 0;
}

img {
  border: none;
  display: block;
}

ol,
ul {
  list-style: none;
}

a {
  text-decoration: none;
  cursor: pointer !important;
}

html {
  font-size: 62.5%;
  -webkit-text-size-adjust: 100%;
  position: relative;
}

body {
  font-family: Arial, sans-serif;
  color: #333;
  line-height: 1.3;
  font-size: 1.6rem;
}

.checkbox-block {
  margin-top: 2rem;
}

.checkbox-item {
  position: relative;
  padding: 0 0 0 4.5rem;
  margin-bottom: 2rem;
  text-align: left;
  line-height: 3rem;
  cursor: pointer;
  transition: all 0.3s linear;
}

.checkbox-item::before {
  content: "";
  position: absolute;
  width: 3rem;
  height: 3rem;
  border: 1px solid #d3cfc8;
  top: 0;
  left: 0;
  line-height: 2.2rem;
  color: #fff;
  font-family: Arial, sans-serif;
  font-weight: bold;
  font-size: 1.6rem;
  text-align: center;
}

.checkbox-item.checked::before {
  background-color: #de9c7d;
}

.checkbox-item.checked::after {
  content: '';
  display: block;
  position: absolute;
  top: 0.1rem;
  left: 0.9rem;
  border: 0.6rem solid #fff;
  border-left: 0;
  border-top: 0;
  width: 0.8rem;
  height: 1.7rem;
  transform: rotate(45deg);
}

JavaScript

/*var $checkbox = [...document.getElementsByClassName('checkbox-item')];*/
var $checkbox = [].slice.call(document.getElementsByClassName('checkbox-item'));
var counter = 0;
//var siblings = 0;


/*function getChildrens(n, selector) {
  var nodes = [];
  while (n.nextElementSibling != null) {
    if (n.nextElementSibling.hasOwnProperty('classList')) {
      if (n.nextElementSibling.classList.contains(selector)) {
        //return n.nextElementSibling;
        nodes.push(n.nextElementSibling);
      }
    }
    n = n.nextElementSibling;
  }
  return nodes;
}

function getSiblings(n, selector) {
  return getChildrens(n, selector);
}

function toggleTip(elem) {
  var siblings = getSiblings(elem, "tip-content");
  if (siblings.length > 0) {
    for (var i = 0; i < siblings.length; i++) {
      siblings[i].classList.toggle("hidden");
    }
  }
}*/

function findSiblingWithId(element) {
    var siblings = element.parentNode.children,
        sibWithId = null;
    for(var i = siblings.length; i--;) {
        if(siblings[i].id) {
        console.log('sibWithId');
            sibWithId = siblings[i];
            break;
        }
    }

    if(sibWithId) {
        // found it
        console.log('sibWithId');
    }
}


// checkbox.forEach((indexButton, index) =>{
var counter = 0;
$checkbox.forEach(indexButton =>{
  indexButton.addEventListener('click', index => {

		/*var siblings = getSiblings(this, "checked");
    console.log(siblings);
    if (siblings.length > 0) {
    
      for (var i = 0; i < siblings.length; i++) {
        siblings[i].classList.toggle("hidden");
      }
    }*/
    
    var isThirdIteration = (counter + 1) % 3 === 0;
		console.log(isThirdIteration);
    if (isThirdIteration) {
      //this.className += ' newClassName';
      console.log('if: ' + isThirdIteration);
    }
    counter++;
    
    ['checked', 'tr-selected'].map(className => indexButton.classList.toggle(className));

		// findSiblingWithId(indexButton);
    //...