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The MouseEvent.shiftKey read-only property indicates if the shift key was pressed (true) or not (false) when the event occurred.


var shiftKeyPressed = instanceOfMouseEvent.shiftKey

Return value

A boolean


<title>shiftKey example</title>

<script type="text/javascript">

function showChar(e){
    "Key Pressed: " + String.fromCharCode(e.charCode) + "\n"
    + "charCode: " + e.charCode + "\n"
    + "SHIFT key pressed: " + e.shiftKey + "\n"
    + "ALT key pressed: " + e.altKey + "\n"


<body onkeypress="showChar(event);">
<p>Press any character key, with or without holding down
 the SHIFT key.<br />
You can also use the SHIFT key together with the ALT key.</p>


Specification Status Comment
Document Object Model (DOM) Level 3 Events Specification
The definition of 'MouseEvent.shiftKey' in that specification.
Obsolete No change from Document Object Model (DOM) Level 2 Events Specification.
Document Object Model (DOM) Level 2 Events Specification
The definition of 'MouseEvent.shiftKey' in that specification.
Obsolete Initial definition.

Browser compatibility

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Feature Edge Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Edge Firefox Mobile (Gecko) Android IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) ? ? ? ? ?

See also

Document Tags and Contributors

 Contributors to this page: libbymc, teoli, kscarfone, amycb, Jeremie
 Last updated by: libbymc,