How "autonumber" text field for next record

I have a field on a form that for example looks like this...  AB-1023  it is a text field

When a new record is added I want the new record's field to be AB-1024.  There will always be a hyphen before the numbers.  Kind of like auto-number but since its not a number field it isn't.

How can I accomplish this?
SteveL13Asked:
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Kanti PrasadCommented:
Hi

Here is one way of doing it. Have an auto number in your table and then take the max add 1 and and append it to AB-

MaxNumber = Select max(autonumber) from your_table_name

Your_Column_Value  = "AB -" & MaxNumber +1

so if your max number is 1023 then Your_Column_Value will be AB- 1024
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
You can write a function to get the biggest number after that AD- preface and add one.

Create a query with a single field:

Max(YourFieldName, Instr(YourFieldName, "-") -1)

This would return the numeric value after that hyphen.

Then just query that query for the Max. You could use DMax for that:

Dim NewNum As String
NewNum = DMAX("NameOfYourQueryField", "NameOfYourQuery")

You could run this in the BeforeInsert or AfterInsert event of the form. This is run when adding a new Record, so the process will not overwrite existing records. I would assume your code would look something like this:

Me.YourTextField = "AD-" & CInt(NewNum) + 1
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SteveL13Author Commented:
Scott:  I entered this in query designer (with the table in the query designer), but get an error when I tab off the field.  The error says "The expression you entered has a function containing the wrong number of arguments.

NewTaskCardN: Max(SAItaskCardN, Instr(SAItaskCardN, "-") -1)
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
That should have been:

NewTaskCardN: Max(Right(SAItaskCardN, Instr(SAItaskCardN, "-") -1))
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SteveL13Author Commented:
No error now.  But  have two test records in the table...  TC-0386 and TC-0387.

The query is returning 87 and I was expecting 0387.

??
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SteveL13Author Commented:
Ok I have the query returning 0387.

But the form is returning AD-388 instead of AD-0388  (I need the zero)
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
0387 isn't a number - why would you expect that??

This code piece:

Me.YourTextField = "AD-" & CInt(NewNum) + 1

If you want to further format that, then use the Format function to do so. See this Help file:

https://msdn.microsoft.com/en-us/library/office/gg251755.aspx

Something like:

Me.YourTextField = "AD-" & Format(CInt(NewNum) + 1, "0000")
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SteveL13Author Commented:
Perfect.  Thank you very much.  This did it...

Me.YourTextField = "AD-" & Format(CInt(NewNum) + 1, "0000")
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SteveL13Author Commented:
If you have time please see new topic "Another "autonumber" issue with a text field"
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