HTML

div contenteditable onchange angular

You can use the input event, like so:
...
<div contenteditable (input)="onNameChange($event.target.innerHTML)">
   Type your name
</div>

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>