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The JavaScript FAQ
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Shift-click: Disabling

Question: Can I disable the default browser response for Shift-click event?

Answer: In Netscape Navigator 4 or Internet Explorer 4 or newer browsers, you can distinguish the Shift-click event from a simple click, and disable the default response for Shift-click. For example, Shift-click has been disabled on this page. If you use version 4 browser (or newer) under Windows, shift-click on any hyperlink on this page to test that! (In older browsers, you would still get the default response.)

To disable Shift-click, insert the following code in your page's <HEAD> section:

<script language="JavaScript">
<!--
function mouseDown(e) {
 var shiftPressed=0;
 if (parseInt(navigator.appVersion)>3) {
  if (navigator.appName=="Netscape")
       shiftPressed=(e.modifiers-0>3);
  else shiftPressed=event.shiftKey;
  if (shiftPressed) {
   alert ('Shift-click is disabled.')
   return false;
  }
 }
 return true;
}
if (parseInt(navigator.appVersion)>3) {
 document.onmousedown = mouseDown;
 if (navigator.appName=="Netscape") 
  document.captureEvents(Event.MOUSEDOWN);
}
//-->
<script>

JavaScripter.net. Copyright © 1999-2006, Alexei Kourbatov

The JavaScript FAQ
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