Change the minimum value:
document.getElementById("myNumber").min = "5";
Click the button to change the value of the min attribute of the number field.
<!DOCTYPE html> <html> <body> Quantity:/*from w w w . j a va2 s . com*/ <input type="number" id="myNumber" min="1" max="10"> <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myNumber").min = "5"; document.getElementById("demo").innerHTML = "The value of the min attribute was changed."; } </script> </body> </html>