Help on expressionin inventory form macro

[Joe Z]

I am attempting to build an Access Inventory file in Acces and reviewing the inventory template I downloaded. The inventory items are displayed in a combobox linked to a table; when the item is not listed a new item must be added through the inventory detail form. Here is where I need some help I decipereing the macro that is initated when opened, the lines

Condition Action Arguments
SetTempVar NewData, Mid(Nz([OpenArgs]),Instr(Nz([OpenArgs]),"=")+1
Onerror Next,
[TempVars]!
[NewData]<>"" SetValue [Item]. [TempVars]![NewData]

I don't quite understand the Instr(Nz[OpenArgs]),"="),=1. I interpret that as searching for the "=" in the string, but why would I be looking for "=" in a new item? This probably a dumb question, but it baffles me. Can anyone enlighten me on this?

 

[Norie]

It looks like it's looking for [NewData] which could be the new value, which isn't on the list.

I think OpenArgs has something to do with forms, specifically when opening forms.

Apparently there is an OpenArgs argument of DoCmd.OpenForm.

Apart from that I'll be honest, I don't understand what's happening either.

If this is meant to add the new item to the existing list I don't see how it's working.

Whenever I've had to do that it's involved appending the value to a table.

 

[Joe Z]

Thanks, it is baffling. Can anyone else enlighten me?