How to prevent arrow keys from changing values in a Number input with JavaScript?

Estimated read time 2 min read

To prevent arrow keys from changing the values of a number input element in JavaScript, you can add an event listener for the keydown event, and then check the key code of the pressed key. If the key code corresponds to an arrow key, you can prevent the default behavior of the event using the preventDefault() method.

Here’s an example of how to prevent arrow keys from changing the values of a number input element:

// Get a reference to the number input element
const input = document.querySelector('input[type="number"]');

// Add an event listener for the keydown event
input.addEventListener('keydown', function(event) {
  // Check if the key code corresponds to an arrow key
  if (event.keyCode >= 37 && event.keyCode <= 40) {
    // Prevent the default behavior of the arrow key
    event.preventDefault();
  }
});

In this example, we use the document.querySelector() method to get a reference to a number input element on the page. We then add an event listener for the keydown event using the addEventListener() method.

Inside the event listener function, we check if the key code of the pressed key corresponds to an arrow key (key codes 37-40 correspond to the left, up, right, and down arrow keys, respectively). If the key code is an arrow key, we use the preventDefault() method to prevent the default behavior of the event, which is to change the value of the input element.

With this code, when the user presses an arrow key while the number input element is focused, the value of the input element will not change.

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