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<!DOCTYPE html> <html> <body> <input type="number" id="myNumber" value="2"><br><br> <button onclick="disableBtn()">Disable Number Field</button> <button onclick="undisableBtn()">Undisable Number Field</button> <p><strong>Note:</strong> input elements with type="number" are not supported in IE 9 and earlier versions.</p> <script> function disableBtn() { document.getElementById("myNumber").disabled = true; } function undisableBtn() { document.getElementById("myNumber").disabled = false; } </script> </body> </html>