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Editorial Team
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Asked: 2026-05-17T22:46:57+00:00

I have a web page with an applet as the only element that looks

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I have a web page with an applet as the only element that looks something like this:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
  <title>...</title>
</head>
<body>
<applet style="padding:1px; border:1px solid gray" mayscript="mayscript" codebase="..." name="AppletName" code="..." archive="..." width="600" height="500" alt="Alt Text">
  <param name="initial_focus" value="true"/> 
   Alt Text
</applet>
</body>
</html>

When the page initially loads, focus is set in the applet and I can tab through and interact with the applet just fine. However, if I leave the browser window and then come back to it, I can no longer regain focus on the applet just using the tab key.

Pressing F5 to reload the page fixes the page so that the Applet regains focus, but this solution is unacceptable.

How do I solve this problem? Thanks.

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1 Answer

  1. Editorial Team

    Tentative solution:

    //Dean Edwards/Matthias Miller/John Resig
function init() {
  // quit if this function has already been called
  if (arguments.callee.done) return;

  // flag this function so we don't do the same thing twice
  arguments.callee.done = true;

  // kill the timer
  if (_timer) clearInterval(_timer);

  window.onfocus = function() {
    if(!document.AppletName.isActive())
      document.AppletName.requestFocus();
  };
}

/* for Mozilla/Opera9 */
if (document.addEventListener) {
  document.addEventListener("DOMContentLoaded", init, false);
}

/* for Internet Explorer */
/*@cc_on @*/
/*@if (@_win32)
  document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");
  var script = document.getElementById("__ie_onload");
  script.onreadystatechange = function() {
    if (this.readyState == "complete") {
      init(); // call the onload handler
    }
  };
/*@end @*/

/* for Safari */
if (/WebKit/i.test(navigator.userAgent)) { // sniff
  var _timer = setInterval(function() {
    if (/loaded|complete/.test(document.readyState)) {
      init(); // call the onload handler
    }
  }, 10);
}

/* for other browsers */
window.onload = init;

    Note that the key part for detecting whether the applet needs focus and requesting it if so is (this only works if mayscript is enabled):

    if(!document.AppletName.isActive())
  document.AppletName.requestFocus();

    The rest of the code is just attaching the window on focus handling after the page is loaded (using the script JQuery.ready is based off of).

    Better solutions welcome.

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