"Key () Pressed" redirects here. For other uses, see Key Pressed (disambiguation).
Key () Pressed?
key (space v) pressed?
Category Sensing
Type Boolean

The Key () Pressed? block is a Sensing block and a Boolean block. The block checks if the specified key is pressed. If the key is being pressed, the block returns "true"; if it is not, it returns "false".

Part of the drop-down menu for the block.

The keys available to be used in this block include the entire English alphabet ( a b c etc.), the number keys ( 0 1 2 etc.), the arrow keys ( ), and the space key. In the Experimental Viewer, the ↵ Enter key could also be chosen. After an update,[when?] this block now includes an any option, which allows one to press any key to operate the block.

Example Uses

As this block checks if a key is being pressed or not, it is useful for controlling objects, especially with One Sprite One Script Projects. If the project requires key input, this block can be used to serve as a replacement for the When () Key Pressed block. The Hat block cannot be used in the middle of a script.

Some common uses for the Key () Pressed? block:

  • Controlling a character
forever
if <key (down arrow v) pressed?> then
change y by (-10)
end
if <key (up arrow v) pressed?> then
change y by (10)
end
if <key (left arrow v) pressed?> then
change x by (-10)
end
if <key (right arrow v) pressed?> then
change x by (10)
end
  • Word processors
  • Moving objects
  • Changing slides in slideshows or changing what characters say
say [Hello!]
wait until <key (any v) pressed?>
wait until <not <key (any v) pressed?>>
say [Welcome to my game!]

Sensing Scrolling

The When () Key Pressed block, the counterpart to the Key () Pressed? block senses the scroll wheel as well as the up/down keys. Combining these two blocks, it is possible to sense when somebody is using the scroll wheel. The following script is one way of doing this.

when [up arrow v] key pressed
if <not <key (up arrow v) pressed?>> then
 . . .

The action is done when the scroll wheel is scrolled up. If the key pressed blocks are changed to the down arrow, it will sense when it is scrolled down.

Detecting More Keys

Main article: Additional Keys

This block has the ability to detect keys that are not available in the dropdown menu. This can be done by inserting a block which reports a key's name into the dropdown:

<key (join [KEY NAME] []) pressed?>

Alternatively, a variable can be inserted into the dropdown:

<key (var) pressed?>
Note Note: This does not work with keys such as the Ctrl, Alt, Tab ⇆, ← Backspace, and ⇧ Shift, although it does work with ↵ Enter.

Suggestions

There are three somewhat popular suggestions related to this block:

Some Scratch Modifications have incorporated these suggestions.

See Also

References

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