Applescript select all checkboxes in scroll area - applescript

Question

I've automated printing a weekly calendar with 'applescript' and 'Calendar'. There is a scroll area with collection of checkboxes. How do you iterate over every checkbox in a scroll area and uncheck it?
https://gist.github.com/spuder/c92dd0637ce85b6960b81e1415d7c52e
This works but is fragile since the rows are hard coded.
-- Click the “<fill in title>” checkbox.
delay 0.5
set timeoutSeconds to 2.0
set uiScript to "click checkbox 1 of row 2 of outline 1 of scroll area 1 of window \"Print\" of application process \"Calendar\""
my doWithTimeout(uiScript, timeoutSeconds)
-- Click the “<fill in title>” checkbox.
delay 1
set timeoutSeconds to 2.0
set uiScript to "click checkbox 1 of row 3 of outline 1 of scroll area 1 of window \"Print\" of application process \"Calendar\""
my doWithTimeout(uiScript, timeoutSeconds)
-- Click the “<fill in title>” checkbox.
delay 1
set timeoutSeconds to 2.0
set uiScript to "click checkbox 1 of row 4 of outline 1 of scroll area 1 of window \"Print\" of application process \"Calendar\""
my doWithTimeout(uiScript, timeoutSeconds)
This seems like it should work but it does not uncheck any of the boxes
delay 1
set timeoutSeconds to 2.0
set uiScript to "click checkbox 1 of every row of outline 1 of scroll area 1 of window \"Print\" of application process \"Calendar\""
my doWithTimeout(uiScript, timeoutSeconds)

Answer 1

This works for me using the latest version of macOS Mojave
tell application "Calendar"
activate
reopen
end tell
tell application "System Events" to tell application process "Calendar"
if not (exists of window "Print") then keystroke "p" using command down
repeat while not (exists of window "Print")
delay 0.1
end repeat
set everyCheckboxRef to a reference to every checkbox of rows of outline 1 ¬
of scroll area 1 of window 1
repeat with i from 1 to count of everyCheckboxRef
set thisCheckbox to item i of everyCheckboxRef
if value of thisCheckbox is 1 then perform action "AXPress" of thisCheckbox
end repeat
end tell

Answer 2

The following example AppleScript code is one way to achieve the goal of unchecking all checkboxes in the Calendars section of the Print dialog box in the Calendar application:
-- # Check to see if Calendar is open and act accordingly.
if running of application "Calendar" then
-- # Calendar is already open however, make sure the main window is showing not minimized.
tell application "Calendar"
if not (visible of window "Calendar") then set visible of window "Calendar" to true
activate -- # Bring the main window forward.
end tell
else
-- # Calendar is not open, so open it.
tell application "Calendar"
activate
-- # Wait for main window before proceeding.
repeat until exists window "Calendar"
delay 0.1
end repeat
end tell
end if
-- # Open the Print dialog box.
tell application "System Events" to keystroke "p" using command down
-- # Make sure the Print dialog box is showing before proceeding.
tell application "Calendar"
repeat until exists window "Print"
delay 0.1
end repeat
end tell
-- # Uncheck all checkboxes in the Calendars scroll area of the Print dialog box.
tell application "System Events"
tell outline 1 of scroll area 1 of window "Print" of application process "Calendar"
repeat with i from 1 to (count rows)
tell row i
if (count UI element) > 0 then
click checkbox 1
end if
end tell
end repeat
end tell
end tell
Note: The example AppleScript code is just that and does not contain any additional error handling as may be appropriate. The onus is upon the user to add any error handling as may be appropriate, needed or wanted. Have a look at the try statement and error statement in the AppleScript Language Guide. See also Working with Errors. Additionally, UI Scripting may require the use of the delay command as appropriate, needed or wanted.