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How to detect when the Alt key is pressed down with JavaScript
If you are developing a web application, and require the service of some special keyboard combinations, you may wish to bring the Alt key into play. Here then is a tutorial on how the Alt key signal can be detected with JavaScript. To accomplish this task we will need to question the object event as to the presence of a signal from the Alt key. We will do this using the following code: event.altKey If true is returned a signal is present. On the other hand if there is not signal the object will return false. Here is what this code looks like in practice: <html> <head> <title>Detecting when the Alt key is pressed with JavaScript</title> <script type="text/javascript"> function getKeys(event) { var status = document.getElementById("status"); if(event.altKey) { status.innerHTML = "The Alt key was pressed!"; } else { status.innerHTML = "The Alt key was NOT pressed!"; } } </script> </head> <body onkeydown="javascript:getKeys(event);"> <span id="status"></span> </body> </html>
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