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How to change an svg image after onClick()?

I have a div tab that contains some text and an svg icon like soenter image description here

Once I click that tab then it expands like so

enter image description here

Once expanded I want the svg icon to change to something else. So far my code isn’t throwing me any errors but also isn’t working as expected either. I currently have a function that should change the icon to icon-cancel.svg after the element is clicked nothing changes. Here is what I have.

<!DOCTYPE html>
<html lang="en">

    <style type="text/css">
      body {
        font-family: 'Roboto Condensed', sans-serif;
      #side-chat {
        position: absolute;
        right: 100%;
        z-index:9999999999999 !important;
        width: 150px;
        margin-right: -59px;
        transform: rotate(-90deg);
        justify-content: center;
        align-items: center;
        color: #ffffff;
        border-radius: 10px;
        background: rgba(30, 175, 230, 0.5);
        text-decoration: none;
        padding: 15px;
        font-size: 25px;
        line-height: 20px;
        text-align: center;    
      #olark-box-wrapper {
        position: absolute;
        z-index:99999999999999 !important;
        top: 400px;
        right: -300px;

        -webkit-transition-duration: 0.3s;
        -moz-transition-duration: 0.3s;
        -o-transition-duration: 0.3s;
        transition-duration: 0.3s;
      #olark-box-wrapper.chatbox-open {
        right: 0
      #olark-box-wrapper.chatbox-closed {
       right: -300px;
      #habla_window_div {
        margin: 0 !important;
      #side-chat img{
        margin-right: 10px;
      #side-chat:active {
       background: #22a7e5;
<div id="olark-box-wrapper">

  <!-- Olark chat tab -->
    <a id="side-chat" href="javascript:void(0);" onclick="changeClass(); changeImage();">
      <img src="icon-chat.svg">

  <!-- Empty Olark chat box container -->
  <div id="olark-box-container"></div>


<!-- begin olark code -->
<script type="text/javascript" async> ;(function(o,l,a,r,k,y){if(o.olark)return; r="script";y=l.createElement(r);r=l.getElementsByTagName(r)[0]; y.async=1;y.src="//"+a;r.parentNode.insertBefore(y,r); y=o.olark=function(){k.s.push(arguments);k.t.push(+new Date)}; y.extend=function(i,j){y("extend",i,j)}; y.identify=function(i){y("identify",k.i=i)}; y.configure=function(i,j){y("configure",i,j);k.c[i]=j}; k=y._={s:[],t:[+new Date],c:{},l:a}; })(window,document,"");
  /* custom configuration goes here ( */
  //olark.configure('system.hb_detached', true);
  olark.configure('box.inline', true);
  <!-- end olark code -->
  <script type='text/javascript'>
    // Javacript function to toggle the class of the chat box wrapper
    function changeClass()
      // Get the HTML object containing the Olark chat box
      var olark_wrapper = document.getElementById("olark-box-wrapper");
      // If the chat box is already open, close id
      if ( olark_wrapper.className.match(/(?:^|s)chatbox-open(?!S)/) ) {
        olark_wrapper.className = "chatbox-closed";
      // Otherwise add open the Olark chat box
      else {        
        olark_wrapper.className = "chatbox-open";

  function changeImage(){
document.getElementById('side-chat').src = "icon-cancel.svg";



Your “side-chat” element is the <a> tag which does not have a src. Try changing getElementById to querySelector to get the image inside instead.

 function changeImage(){
     document.querySelector('#side-chat img').src = "icon-cancel.svg";