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Menu Icon for Side Navigation

The menu icon opens a side navigation on click and the icon turns into a "X". On second click I would like it to close the side navigation and turn back to normal menu icon.

I have the code below:

<!DOCTYPE html>
<html>
<head>
<style>
.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #111;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

.sidenav a:hover {
    color: #f1f1f1;
}

.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
}

#main {
    transition: margin-left .5s;
    padding: 16px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}

.container {
    display: inline-block;
    cursor: pointer;
}

.bar1, .bar2, .bar3 {
    width: 35px;
    height: 5px;
    background-color: #333;
    margin: 6px 0;
    transition: 0.4s;
}

.change .bar1 {
    -webkit-transform: rotate(-45deg) translate(-9px, 6px) ;
    transform: rotate(-45deg) translate(-9px, 6px) ;
}

.change .bar2 {opacity: 0;}

.change .bar3 {
    -webkit-transform: rotate(45deg) translate(-8px, -8px) ;
    transform: rotate(45deg) translate(-8px, -8px) ;
}

</style>

</head>
<body>

<div id="mySidenav" class="sidenav">
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>

<div id="main">
  <div class="container" style="font-size:30px;cursor:pointer" onclick="openNav(); myFunction(this)">
        <div class="bar1"></div>
        <div class="bar2"></div>
        <div class="bar3"></div>
</div>
</div>

<script>
function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
    document.getElementById("main").style.marginLeft = "250px";
}

function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
    document.getElementById("main").style.marginLeft= "0";
}

function myFunction(x) {
    x.classList.toggle("change");
}


</script>

</body>
</html> 

It currently opens the side nav fine but I am not sure how to tell it to close the side nav on second click, or where to put my closeNav() funtion.

Any help would be appreciated.

You could use a class toggle. One class could be the menu closed with the x icon and when you toggle the other class, you can just specify the opposite.

 document.getElementById('menu').addEventListener('click', function () { if (this.classList.contains('open')) { this.classList.remove('open'); } else { this.classList.add('open'); } }); 
 #menu { background:red; width:100px; height:200px; } #menu.open { width:250px; background:blue; } 
 <div id="menu"> <p>click me!</p> </div> 

I dislike adding JQuery if it is not already in use...You can do this just by checking the state of the menu.

<div id="mySidenav" class="sidenav">
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>

<div id="main">
  <div class="container" style="font-size:30px;cursor:pointer" onclick="toggleMenu(this)">
        <div class="bar1"></div>
        <div class="bar2"></div>
        <div class="bar3"></div>
</div>
</div>

<script>
function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
    document.getElementById("main").style.marginLeft = "250px";
}

function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
    document.getElementById("main").style.marginLeft= "0";
}

function toggleMenu(x) {
    x.classList.toggle("change");
    if(document.getElementById("mySidenav").style.width > "1px"){
    closeNav();
    } else {
    openNav();
    }
}
</script>

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