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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The oncopy property of the HTMLElement interface is an EventHandler that processes copy events.

The copy event fires when the user attempts to copy text.


target.oncopy = functionRef;


functionRef is a function name or a function expression. The function receives a ClipboardEvent object as its sole argument.


This example blocks every copy and paste attempt from the <textarea>.


<h3>Play with this text area:</h3>
<textarea id="editor" rows="3">Try copying and pasting text into this field!</textarea>

<p id="log"></p>


function logCopy(event) {
  log.innerText = 'Copy blocked!\n' + log.innerText;

function logPaste(event) {
  log.innerText = 'Paste blocked!\n' + log.innerText;

const editor = document.getElementById('editor');
const log = document.getElementById('log');

editor.oncopy = logCopy;
editor.onpaste = logPaste;



WHATWG Standard

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 71Edge Full support 12Firefox Full support 3IE ? Opera Full support YesSafari Full support YesWebView Android Full support 71Chrome Android Full support 71Edge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?


Full support  
Full support
Compatibility unknown  
Compatibility unknown
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.

Since Firefox 13, the preference dom.event.clipboardevents.enabled controls this feature. It defaults to true but can be disabled.

See also

Метки документа и участники

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