{{APIRef}}
The
Document.hasFocus() method returns a {{jsxref("Boolean")}} value indicating whether the document or any element inside the document has focus. This method can be used to determine whether the active element in a document has focus.When viewing a document, an element with focus is always the active element in the document, but an active element does not necessarily have focus. For example, an active element within a (popup) window that is not the foreground has no focus.
Syntax
focused = document.hasFocus();
Return value
false if the active element in the document has no focus; true if the active element in the document has focus.
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>TEST</title>
<style>
#message { font-weight: bold; }
</style>
<script>
setInterval( CheckPageFocus, 200 );
function CheckPageFocus() {
var info = document.getElementById("message");
if ( document.hasFocus() ) {
info.innerHTML = "The document has the focus.";
} else {
info.innerHTML = "The document doesn't have the focus.";
}
}
function OpenWindow() {
window.open (
"https://developer.mozilla.org/",
"mozdev",
"width=640,
height=300,
left=150,
top=260"
);
}
</script>
</head>
<body>
<h1>JavaScript hasFocus example</h1>
<div id="message">Waiting for user action</div>
<div><button onclick="OpenWindow()">Open a new window</button></div>
</body>
</html>
Browser compatibility
{{ CompatibilityTable() }}
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 30 | {{ CompatGeckoDesktop("1.9") }} | 6.0 | {{ CompatNo() }} | {{ CompatVersionUnknown() }} |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | {{ CompatUnknown() }} | {{ CompatGeckoMobile("1.9") }} | {{ CompatUnknown() }} | {{ CompatNo() }} | {{ CompatUnknown() }} |