JSFiddle - React, Tailwind, and code Playground

by Imri Paloja

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/skeleton/2.0.4/skeleton.min.css">
<div class="container">


  <h2>Custom Select</h2>

  <!--surround the select box with a "custom-select" DIV element. Remember to set the width:-->
  <div class="custom-select" style="width:100%;">
    <select>
      <option value="0">Select car:</option>
      <option value="1">Audi</option>
      <option value="2">BMW</option>
      <option value="3">Citroen</option>
      <option value="4">Ford</option>
      <option value="5">Honda</option>
      <option value="6">Jaguar</option>
      <option value="7">Land Rover</option>
      <option value="8">Mercedes</option>
      <option value="9">Mini</option>
      <option value="10">Nissan</option>
      <option value="11">Toyota</option>
      <option value="12">Volvo</option>
    </select>
  </div>

</div>

CSS

html,
body {
  color: #454545;
}

.container {
  margin-top: 5%;
/*   width: 75%;
  padding: 20px 30px; */
}

/*the container must be positioned relative:*/
.custom-select {
  position: relative;
  font-family: Arial;
}

.custom-select select {
  display: none;
  /*hide original SELECT element:*/
}

.select-selected {
  background-color: DodgerBlue;
}

/*style the arrow inside the select element:*/
.select-selected:after {
  position: absolute;
  content: "";
  top: 14px;
  right: 10px;
  width: 0;
  height: 0;
  border: 6px solid transparent;
  border-color: #fff transparent transparent transparent;
}

/*point the arrow upwards when the select box is open (active):*/
.select-selected.select-arrow-active:after {
  border-color: transparent transparent #fff transparent;
  top: 7px;
}

/*style the items (options), including the selected item:*/
.select-items div,
.select-selected {
  color: #ffffff;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-color: transparent transparent rgba(0, 0, 0, 0.1) transparent;
  cursor: pointer;
  user-select: none;
}

/*style items (options):*/
.select-items {
  position: absolute;
  background-color: DodgerBlue;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 99;
}

/*hide the items when the select box is closed:*/
.select-hide {
  display: none;
}

.select-items div:hover,
.same-as-selected {
  background-color: rgba(0, 0, 0, 0.1);
}

JavaScript

var x, i, j, l, ll, selElmnt, a, b, c;
/*look for any elements with the class "custom-select":*/
x = document.getElementsByClassName("custom-select");
l = x.length;
for (i = 0; i < l; i++) {
  selElmnt = x[i].getElementsByTagName("select")[0];
  ll = selElmnt.length;
  /*for each element, create a new DIV that will act as the selected item:*/
  a = document.createElement("DIV");
  a.setAttribute("class", "select-selected");
  a.innerHTML = selElmnt.options[selElmnt.selectedIndex].innerHTML;
  x[i].appendChild(a);
  /*for each element, create a new DIV that will contain the option list:*/
  b = document.createElement("DIV");
  b.setAttribute("class", "select-items select-hide");
  for (j = 1; j < ll; j++) {
    /*for each option in the original select element,
    create a new DIV that will act as an option item:*/
    c = document.createElement("DIV");
    c.innerHTML = selElmnt.options[j].innerHTML;
    c.addEventListener("click", function(e) {
      /*when an item is clicked, update the original select box,
      and the selected item:*/
      var y, i, k, s, h, sl, yl;
      s = this.parentNode.parentNode.getElementsByTagName("select")[0];
      sl = s.length;
      h = this.parentNode.previousSibling;
      for (i = 0; i < sl; i++) {
        if (s.options[i].innerHTML == this.innerHTML) {
          s.selectedIndex = i;
          h.innerHTML = this.innerHTML;
          y = this.parentNode.getElementsByClassName("same-as-selected");
          yl = y.length;
          for (k = 0; k < yl; k++) {
            y[k].removeAttribute("class");
          }
          this.setAttribute("class", "same-as-selected");
          break;
        }
      }
      h.click();
    });
    b.appendChild(c);
  }
  x[i].appendChild(b);
  a.addEventListener("click", function(e) {
    /*when the select box is clicked, close any other select boxes,
    and open/close the current select box:*/
    e.stopPropagation();
    closeAllSelect(this);
   ...