The copy event fires when the user initiates a copy action through the browser's user interface.

The event's default action is to copy the selection (if any) to the clipboard.

A handler for this event can modify the clipboard contents by calling setData(format, data) on the event's ClipboardEvent.clipboardData property, and cancelling the event's default action using event.preventDefault().

However, the handler cannot read the clipboard data.

It's possible to construct and dispatch a synthetic copy event, but this will not affect the system clipboard.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("copy", (event) => {});

oncopy = (event) => {};

A ClipboardEvent. Inherits from Event.

HTML

<div class="source" contenteditable="true">Copy text from this box.</div>
<div class="target" contenteditable="true">And paste it into this one.</div>

JavaScript

const source = document.querySelector("div.source");

source.addEventListener("copy", (event) => {
  const selection = document.getSelection();
  event.clipboardData.setData("text/plain", selection.toString().toUpperCase());
  event.preventDefault();
});

Result

• Related events: cut, paste
• This event on Document targets: copy
• This event on Window targets: copy