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    Document.hasFocus()

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    The Document.hasFocus() method returns a 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.

    SyntaxEdit

    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.

    ExampleEdit

    <!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 (
    "http://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>

    SpecificationEdit

    Specification Status Comment
    WHATWG HTML Living Standard
    The definition of 'Document.hasFocus()' in that specification.    		 Living Standard Initial definition

    Browser compatibilityEdit

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 30 3.0 (1.9) 6.0 No support (Yes)

    See alsoEdit

    Document Tags and Contributors

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     Last updated by: scunliffe,