Get Codemirror textbox value on update

So I'm trying to use Codemirror to get input from a webpage and I would like it to update a value in Javascript whenever the text input changes. Currently I have this working, but the user must press a button for the input to be sent to the JS file.

<!DOCTYPE html>
<html>
    <head>
        <title>CodeMirror</title>
    <script src="codemirror/lib/codemirror.js"></script>
    <link href="codemirror/lib/codemirror.css" rel="stylesheet"></link>
    <script src="codemirror/mode/xml/xml.js"></script>
    <script src="codemirror/addon/edit/closetag.js"></script>
    <link href="codemirror/theme/dracula.css" rel="stylesheet"></link>
    </head>
    <body>
        <textarea id="editor"><p>A paragraph</p></textarea>

    <script>
        var editor = CodeMirror.fromTextArea(document.getElementById('editor'), {
        mode: "xml",
        theme: "dracula",
        lineNumbers: true,
        autoCloseTags: true
      });

        function showCode() {
             var text = editor.getValue()
             console.log(text);
        }
    </script>

        <input id="clickMe" type="button" value="clickme" onclick="showCode();" />
    </body>
</html>

How would I be able to basically automate the button so that whenever the value of the Codemirror text area changes, the JS script runs.

Solution

The 'change' event will tell you when something has changed.

const editor = CodeMirror.fromTextArea(document.getElementById('editor'), {});
editor.on('change', (editor) => {
  const text = editor.doc.getValue()
  console.log(text);
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.41.0/codemirror.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.41.0/codemirror.min.css" rel="stylesheet"></link>
<textarea id="editor"><p>A paragraph</p></textarea>