onkeyup (HTML attribute)

Depr. Version
Browser support (more…)
IE5.5+ FF1+ SA1.3+ OP9.2+
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The onkeyup event handler captures the moment at which a previously pressed key is released while focus is on the element to which the onkeyup attribute is applied. Note that a keydown event followed by a keyup event automatically generates a keypress event, which can be captured using the onkeydown, onkeyup, and onkeypress attributes.

Note that this event attribute cannot be applied to the following elements:

  • applet
  • base
  • basefont
  • bdo
  • br
  • font
  • frame
  • frameset
  • head
  • html
  • iframe
  • isindex
  • meta
  • param
  • script
  • style
  • title


This attribute might be used in a case in which, for example, the user presses the space key until an activity on screen is completed; when the user releases the key, onkeyup may be used to pause the action, like so:
<body onkeydown="increasePower();" onkeyup="holdPowerLevel();"/>


This attribute has no fixed value. It’s up to the author to decide on the scripting that’s included here, be that a call to one or more defined functions, or a simple alert() statement.


Internet Explorer Firefox Safari Opera
5.5 6.0 7.0 1.0 1.5 2.0 1.3 2.0 3.0 9.2 9.5
Full Full Full Full Full Full Full Full Full Full Full

Every browser listed supports this attribute. However, inline event handlers such as this should be avoided. In the same way that inline CSS styles are frowned upon but externally defined CSS styles are considered good practice, inline event handlers should be stripped out and replaced with events attached unobtrusively through the DOM.

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