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mouseUp is a message. It works on Desktop, Server, Web and Mobile.

It's activated after the user release the mouse button on a control: it's better than mouseDown message, because user could press the button but not releasing on it intending to not activate a control.

It should be always used when the user want to activate a control with the mouse.


on mouseUp
 answer "You clicked" & (the name of the target)
end mouseUp
on mouseUp mousebutton
 answer "You clicked button " & mousebutton
end mouseUp

Parameters Edit

You may specify to knoewhich mouse button was pressed:

  • 1 is the mouse button on Mac OS systems and the left button on Windows and Unix systems.
  • 2 is the middle button on Unix systems.
  • 3 is the right button on Windows and Unix systems and Control-click on Mac OS systems.

Comments: The mouseUp message is sent to the control that was clicked, or to the card if no control was under the mouse pointer.

The mouseUp message is sent only when the Browse tool is being used. If an unlocked field is clicked with mouse button 1 or 2, no mouseUp message is sent.

If the mouse has moved outside the control that was originally clicked before the user releases the mouse button, the mouseRelease message is sent instead of mouseUp. If the click is the second click of a double click, the mouseDoubleUp message is sent instead of mouseUp.

Tip Edit

If the user clicks several times in rapid succession (for example, if the user clicks an "Increase" button that increases a number by 1), some of the clicks may send a mouseDoubleUp message instead of mouseUp. If your script only handles the mouseUp message, these accidental double clicks will be lost. One way to prevent this is to install a handler in an object that's further in the message path, to re-send double clicks:

on mouseDoubleUp
  if "on mouseUp" is in the script of the target and "on mouseDoubleUp" is not in the script of the target then 
     send "mouseUp: to the target
  end if
end mouseDoubleUp

If the user double-clicks an object whose script contains a mouseUp handler but no mouseDoubleUp, the above handler will automatically send a mouseUp to the object so the second click can be handled normally (instead of as a double-click).

Important! If the user clicks a transparent pixel in an image, the mouseUp message is sent to the object behind the image, not to the image.

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