Create Tree View Tutorial

Netbax Online Editor Try it Yourself

<ul id="net">
  <li><span class="net1">Menu</span>
    <ul class="net2">
      <li>Pages#1</li>
      <li>Pages#2</li>
      <li><span class="net1">Menu#1</span>
        <ul class="net2">
          <li>Pages#1</li>
          <li>Pages#2</li>
          <li><span class="net1">Menu#2</span>
            <ul class="net2">
              <li>Pages#1</li>
              <li>Pages#2</li>
              <li>Pages#3</li>
              <li>Pages#4</li>
            </ul>
          </li>
        </ul>
      </li>  
    </ul>
  </li>
</ul> 
<style>
ul, #net {
  list-style-type: none;

}

#net {
  margin: 0;
  padding: 0;
}

.net1 {
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
font-family: Tahoma;
font-size: 20px;
text-transform: capitalize;
color:#000;
}

.net1::before {
  content: "\25B6";
  color: #c00;
  display: inline-block;
  margin-right: 6px;

}

.net1-down::before {
  -ms-transform: rotate(90deg);
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);  
}

.net2 {
  display: none;
font-family: Tahoma;
font-size: 20px;
text-transform: capitalize;
color:#555;
}

.net3 {
  display: block;
}
</style>

for (i = 0; i < toggler.length; i++) {
  toggler[i].addEventListener("click", function() {
    this.parentElement.querySelector(".net2").classList.toggle("net3");
    this.classList.toggle("net1-down");
  });
}
</script>