JSFiddle - React, Tailwind, and code Playground

by mikecmpbll

HTML

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="category-control">
  <label class="check-box-label" data-category="20" style="background-color: #ff8000; color: white;">
    <input type="checkbox" name="student[category_ids][]" id="student_category_ids_" value="20" class="badgebox" checked="checked">
    <span class="category-badge"><i class="fa"></i>
    </span>Test category
    <span class="selection-counter"></span>
    <span class="expand-subcategories">&#9660</span>
  </label>

  <div class="subcategory-drop">
    <ul>
      <li>
        <label class="check-box-label2" data-category="20" style="background-color: #ff8000; color: white;">
          <input type="checkbox" name="student[category_ids][]" id="student_category_ids_" value="20" class="badgebox">
          <span class="category-badge"><i class="fa"></i>
          </span>Test subcategory
        </label>
      </li>
      <li>
        <label class="check-box-label2" data-category="20" style="background-color: #ff8000; color: white;">
          <input type="checkbox" name="student[category_ids][]" id="student_category_ids_" value="20" class="badgebox">
          <span class="category-badge"><i class="fa"></i>
          </span>Test subcategory
        </label>
      </li>
      <li>
        <label class="check-box-label2" data-category="20" style="background-color: #ff8000; color: white;">
          <input type="checkbox" name="student[category_ids][]" id="student_category_ids_" value="20" class="badgebox">
          <span class="category-badge"><i class="fa"></i>
          </span>Test subcategory
        </label>
      </li>
    </ul>
  </div>
</div>

<div class="category-control">
  <label class="check-box-label" data-category="20" style="background-color: #ff8000; color: white;">
    <input type="checkbox" name="student[category_ids][]" id="student_category_ids_" value="20" class="badgebox" checked="checked">
    <span...

SCSS

* { font-family: Helvetica, Arial, sans-serif; padding: 0; }

input[type="checkbox"] {
  margin: 4px 0 0;
  line-height: normal;
}

.check-box-label {
  font-weight: inherit;
  font-size: 85%;
  padding-left: 4px;
  padding-right: 6px;
  border-radius: 1em;
  display: inline-block;
  cursor: pointer;
  margin-bottom: 2px;
  max-width: 100%;
  z-index: 5;
  position: relative;
}

.check-box-label2 {
  font-weight: inherit;
  font-size: 85%;
  display: block;
  width: 100%;
  cursor: pointer;
}

.category-badge {
  margin: 1px;
  padding-bottom: 1px;
  display: inline-block;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  border-radius: 10px;
}

a.category-badge:hover {
  color: inherit;
}

.badgebox {
  opacity: 0;
}

.badgebox + .category-badge {
  text-indent: -999999px;
  width: 18px;
  margin-left: -15px;
}

.badgebox + .category-badge {
  text-indent: 0;

  & > .fa::before {
    content: "\f0c8";
  }
}

.badgebox:checked + .category-badge {
  text-indent: 0;

  & > .fa::before {
    content: "\f00c";
  }
}

.category-control {
  position: relative;
  display: inline-block;
}

.subcategory-drop {
  display: none;
  position: relative;
  /* background-color: #f9f9f9; */
  /* width: 100%; */
  /* box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); */
  /* padding: 12px 16px; */
  z-index: 1;
  top: -39px;
  padding: 0;
  margin: 0;

  ul {
    padding-top: 21px;
    list-style-type: none;
    background-color: gray;
    border-radius: 10px;
  }
}

.expand-subcategories {
  font-size: 10px;
}

JavaScript

$('.expand-subcategories').on('click', function() {
  if ($('.subcategory-drop').css('display') == "block") {
    $('.subcategory-drop').css('display', 'none')
  } else {
    $('.subcategory-drop').css('display', 'block')
  }
})

$('.check-box-label2 input').on('change', function() {
  var $selectionCounter = $(this).closest('.category-control').find('.selection-counter')
  var counter = Number($(this).closest('.category-control').find('.selection-counter').text())
  
	if ($(this).is(':checked')) {
  	counter ++;
  } else {
  	counter --;
  }
  
  $selectionCounter.text(counter == 0 ? "" : "+" + counter)
})