Using the Ace editor

Ace is the code editor embedded within Lectora Online. It provides the features and performance of today's native editors, such as syntax highlighting for over a hundred languages, selecting from several themes, code folding, an API, and much more. Refer to this section for tips to improve your experience using Ace.

For more information about working with the Ace editor, visit

Ace provides the following keyboard shortcuts to streamline the coding process.

Default keyboard shortcuts

Refer to the following default keyboard shortcuts when using Ace.

Line operations

Action Windows/Linux Mac
Remove line Ctrl-D Command-D
Copy lines down Alt-Shift-Down Command-Option-Down
Copy lines up Alt-Shift-Up Command-Option-Up
Move lines down Alt-Down Option-Down
Move lines up Alt-Up Option-Up
Remove to line end Alt-Delete Ctrl-K
Remove to linestart Alt-Backspace Command-Backspace
Remove word left Ctrl-Backspace Option-Backspace, Ctrl-Option-Backspace
Remove word right Ctrl-Delete Option-Delete
Split line --- Ctrl-O


Action Windows/Linux Mac
Select all Ctrl-A Command-A
Select left Shift-Left Shift-Left
Select right Shift-Right Shift-Right
Select word left Ctrl-Shift-Left Option-Shift-Left
Select word right Ctrl-Shift-Right Option-Shift-Right
Select line start Shift-Home Shift-Home
Select line end Shift-End Shift-End
Select to line end Alt-Shift-Right Command-Shift-Right
Select to line start Alt-Shift-Left Command-Shift-Left
Select up Shift-Up Shift-Up
Select down Shift-Down Shift-Down
Select page up Shift-PageUp Shift-PageUp
Select page down Shift-PageDown Shift-PageDown
Select to start Ctrl-Shift-Home Command-Shift-Up
Select to end Ctrl-Shift-End Command-Shift-Down
Duplicate selection Ctrl-Shift-D Command-Shift-D
Select to matching bracket Ctrl-Shift-P ---


Action Windows/Linux Mac
Add multi-cursor above Ctrl-Alt-Up Ctrl-Option-Up
Add multi-cursor below Ctrl-Alt-Down Ctrl-Option-Down
Add next occurrence to multi-selection Ctrl-Alt-Right Ctrl-Option-Right
Add previous occurrence to multi-selection Ctrl-Alt-Left Ctrl-Option-Left
Move multicursor from current line to the line above Ctrl-Alt-Shift-Up Ctrl-Option-Shift-Up
Move multicursor from current line to the line below Ctrl-Alt-Shift-Down Ctrl-Option-Shift-Down
Remove current occurrence from multi-selection and move to next Ctrl-Alt-Shift-Right Ctrl-Option-Shift-Right
Remove current occurrence from multi-selection and move to previous Ctrl-Alt-Shift-Left Ctrl-Option-Shift-Left
Select all from multi-selection Ctrl-Shift-L Ctrl-Shift-L

Go to

Action Windows/Linux Mac
Go to left Left Left, Ctrl-B
Go to right Right Right, Ctrl-F
Go to word left Ctrl-Left Option-Left
Go to word right Ctrl-Right Option-Right
Go line up Up Up, Ctrl-P
Go line down Down Down, Ctrl-N
Go to line start Alt-Left, Home Command-Left, Home, Ctrl-A
Go to line end Alt-Right, End Command-Right, End, Ctrl-E
Go to page up PageUp Option-PageUp
Go to page down PageDown Option-PageDown, Ctrl-V
Go to start Ctrl-Home Command-Home, Command-Up
Go to end Ctrl-End Command-End, Command-Down
Go to line Ctrl-L Command-L
Scroll line down Ctrl-Down Command-Down
Scroll line up Ctrl-Up ---
Go to matching bracket Ctrl-P ---
Scroll page down --- Option-PageDown
Scroll page up --- Option-PageUp


Action Windows/Linux Mac
Find Ctrl-F Command-F
Replace Ctrl-H Command-Option-F
Find next Ctrl-K Command-G
Find previous Ctrl-Shift-K Command-Shift-G


Action Windows/Linux Mac
Fold selection Alt-L, Ctrl-F1 Command-Option-L, Command-F1
Unfold Alt-Shift-L, Ctrl-Shift-F1 Command-Option-Shift-L, Command-Shift-F1
Fold all Alt-0 Command-Option-0
Unfold all Alt-Shift-0 Command-Option-Shift-0


Action Windows/Linux Mac
Indent Tab Tab
Outdent Shift-Tab Shift-Tab
Undo Ctrl-Z Command-Z
Redo Ctrl-Shift-Z, Ctrl-Y Command-Shift-Z, Command-Y
Show the settings menu Ctrl-, Command-,
Toggle comment Ctrl-/ Command-/
Transpose letters Ctrl-T Ctrl-T
Enter full screen Ctrl-Enter Command-Enter
Change to lower case Ctrl-Shift-U Ctrl-Shift-U
Change to upper case Ctrl-U Ctrl-U
Overwrite Insert Insert
Macros replay Ctrl-Shift-E Command-Shift-E
Macros recording Ctrl-Alt-E ---
Delete Delete ---
Center selection --- Ctrl-L

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