Using Lua in Custom Functions

Lua Functions

In the latest product updates in version 2019 and above, you can use Lua functions if the format uses RENDER=API.

Tip: Refer to Lua documentation for tips to get started with Lua scripting.

To use a Lua function in a format, the formats needs the line ‘RENDER=API’.

Add a section for the Lua function.

The section for the Lua function starts with >>> lua and ends with <<< lua

Example:

The example below checks if Ref is blank then the function returns first applied Invoice Number.

Copy

LUA function in EFT Formats.ini

>>> lua
function GetRef(Ref)
    if Ref == "" then return GetField("FirstInvoiceNumber") 
    else return(Ref)
    end
end
<<< lua

Using the function

You can then create a variable using the function

Example:

DRef is the variable where you call the function (GetRef) and pass the parameter, in this case the DestReference field.

DRef="[Eval(GetRef(Trim(GetField("DestReference"))))] "

Add the variable in the format definition

Lastly, use the variable on the line where you want it to be displayed.