User Guide

180 Chapter 10: Events and Messages
You can override an on keyDown handler by placing an alternative on keyDown handler in a
location that Lingo checks before it gets to the handler you want to override. For example, you
can override an
on keyDown handler assigned to a cast member by placing an on keyDown
handler in a sprite script.
Example
This handler checks whether the Return key was pressed and if it was, sends the playhead to
another frame:
-- Lingo syntax
on keyDown
if (_key.key = RETURN) then _movie.go("AddSum")
end keyDown
// JavaScript syntax
function keyDown() {
if (_key.keyCode == 36) {
_movie.go("AddSum");
}
}
See also
charToNum(), keyDownScript, keyUpScript, key, keyCode, keyPressed()
on keyUp
Usage
-- Lingo syntax
on keyUp
statement(s)
end
// JavaScript syntax
function keyUp() {
statement(s);
}
Description
System message and event handler; contains statements that run when a key is released. The on
keyUp
handler is similar to the on keyDown handler, except this event occurs after a character
appears if a field or text sprite is editable on the screen.
When a key is released, Lingo searches these locations, in order, for an
on keyUp handler: primary
event handler, editable field sprite script, field cast member script, frame script, and movie script.
For sprites and cast members,
on keyUp handlers work only for editable strings. A keyUp event on
a different type of cast member, such as a bitmap, has no effect. If releasing a key should always
have the same response throughout the movie, set
keyUpScript.
Lingo stops searching when it reaches the first location that has an on keyUp handler, unless the
handler includes the
pass command to explicitly pass the keyUp message on to the next location.
The on keyUp event handler is a good place to put Lingo that implements keyboard shortcuts or
other interface features that you want to occur when the user releases keys.