HTML

contenteditable onchange

<!-- Use an "input" event listener -->
<div contenteditable="true" id="editor">Please type something in here</div>
<script>
  document.getElementById("editor").addEventListener("input", inputEvt => {
    console.log("input event fired");
  }, false);
</script>

onchange for contenteditable div

<div id="editor" contenteditable>
      Text inside div
</div>
<script type="text/javascript">
  document.getElementById("editor").addEventListener("input", 
  	(e) => console.log(e.currentTarget.textContent), false);
</script>