List of JavaScript functions supported in qPDFToolkit:

App

Methods:
alert
beep

Console

Methods:
println

Doc

Methods:
calculateNow
getField
getNthFieldName

Properties:
calculate
numFields
URL

Field

Methods:
buttonGetCaption
buttonSetCaption
clearItems
deleteItemAt
getArray
getItemAt
insertItemAt
isBoxChecked
setAction
setItems

Properties:
borderStyle
borderWidth
calcOrderIndex
charLimit
comb
commitOnSelChange
currentValueIndices
defaultValue
delay
display
doc
doNotScroll
doNotSpellCheck
editable
exportValues
fileSelect
fillColor
hidden
lineWidth
multiline
multipleSelection
name
numItems
page
password
readonly
required
strokeColor
submitName
textColor
type
userName
value
valueAsString

Util

Methods:
printd
printf
printx

For more information about how to use these objects and methods, see Acrobat JavaScript Scripting Reference