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The MouseEvent.altKey
read-only property is a Boolean
indicates if the alt key was pressed (true
) or not (false
) when the event occurred.
Syntax
var altKeyPressed = instanceOfMouseEvent.altKey
Examples
<html> <head> <title>altKey example</title> <script type="text/javascript"> function showChar(e){ alert( "Key Pressed: " + String.fromCharCode(e.charCode) + "\n" + "charCode: " + e.charCode + "\n" + "ALT key pressed: " + e.altKey + "\n" ); } </script> </head> <body onkeypress="showChar(event);"> <p> Press any character key, with or without holding down the ALT key.<br /> You can also use the SHIFT key together with the ALT key. </p> </body> </html>
Specifications
Specification | Status | Comment |
---|---|---|
Document Object Model (DOM) Level 3 Events Specification The definition of 'MouseEvent.altkey' in that specification. |
Working Draft | No change from Document Object Model (DOM) Level 2 Events Specification. |
Document Object Model (DOM) Level 2 Events Specification The definition of 'MouseEvent.altkey' in that specification. |
Recommendation | Initial definition. |
Browser compatibility
Feature | Firefox (Gecko) | Chrome | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Firefox Mobile (Gecko) | Android | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
Basic support | ? | ? | ? | ? | ? |