Cool Tricks for the Sophisticated Developer

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Cool Tricks for the Sophisticated Developer

 

Christopher Weber

 

This month, Chris Weber addresses questions from real-life,

Access training seminar attendees about report totals, splash

screens, trapping keystrokes, managing control widths, when

there’s more in a memo than meets the eye, triple state

check boxes, tables for one, and using the new Dirty

event. The answers aren’t always obvious, especially to

the new generation of Access users.

 

I have a report that lists order totals by employee with a

running total alongside. However, I only want to show the

running total field alongside the very last order total. I

know I can just put the total in a footer below the list, but

the requirement is to show it alongside the last entry to recreate

the same look we had in a previous system. I’ve tried

hiding the control by setting its visible property, but I can’t

seem to figure out when the last entry will format so that I

can unhide it. Is there a property that will let me do this?

 

As I understand your question, you currently have the

data shown in Figure 1, but you’d like it to print as

shown in Figure 2. The fundamental problem here is

either finding out when the last order total will format,

or possibly knowing ahead of time what the total will

be so that when the running total control equals that

value it can be made visible. In either case, a domain

function comes to the rescue.

One way of finding which item is the last one is to

use a domain function. I’m particularly fond of domain

functions as they’re fast and easy to use, require a

single line of code, and don’t require saving a separate

query object in the database container. Regardless of

which domain function you use, they all have the same

general syntax:

 

functionname(fieldname, table or query name, _

[optional wherecondition])

 

The wherecondition is the same as a where clause

in a query without the word “WHERE,” just as you

might use in an OpenForm method.

For my first solution to knowing when the last

order total will print, you’ll need to know the print

sequence of the employee’s order totals. For example,

if you have the totals listed by date, then you can use

the DMax function in an invisible control in a header ...

 

200202_cw

Figure 1. How the

data looks.

 

200202_cw2

Figure 2. How the

data should look.