HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scrollHeight overflow</title>
  <style>
    #notes {
      width: 260px;
      height: 120px;
      overflow: auto;
      padding: 8px;
      border: 2px solid #00b4c5;
      border-radius: 6px;
    }
  </style>
</head>
<body>
  <div id="notes">
    <p>Overflow line 1</p>
    <p>Overflow line 2</p>
    <p>Overflow line 3</p>
    <p>Overflow line 4</p>
    <p>Overflow line 5</p>
    <p>Overflow line 6</p>
    <p>Overflow line 7</p>
    <p>Overflow line 8</p>
  </div>
  <pre id="out"></pre>
  <script>
    function isOverflowing(element) {
      return element.scrollHeight > element.clientHeight;
    }
    var box = document.getElementById("notes");
    document.getElementById("out").textContent = "isOverflowing: " + isOverflowing(box);
  </script>
</body>
</html>

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Element.scrollHeight — detect overflow (Try It)