how to simulate keydown in javascript

To simulate a keydown event in JavaScript, you can create an Event object, set the keyCode and which properties to the key code you want, and then dispatch the event using dispatchEvent() method.

Here is an example code snippet that shows how to simulate a keydown event for the "Enter" key:

index.tsx
// Create a new "keydown" event
const event = new KeyboardEvent('keydown', {
  keyCode: 13,
  which: 13
});

// Dispatch the event on the document object
document.dispatchEvent(event);
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In this example, the keyCode and which properties are set to 13, which is the key code for the "Enter" key. The KeyboardEvent constructor is used to create the event object, and the dispatchEvent() method is used to dispatch the event on the document object.