DATA Validation (Ignore Blanks)

[Guest]

I have a cell A1 which needs to be populated with a number of 0 or greater
and it cannot be left blank.

I used DATA validation with the "Custom" option and populated the "Formula"
with =A1>=0.

I also unclicked the Ignore Blank.

Somehow the validation works for zero or greater but I can still enter
"blank".

Where have I gone in err?

Thanks.

 

[Peo Sjoblom]

How do you enter a blank? I assume you means a space? If that's the case use

=AND(A1>=0,ISNUMBER(A1))

 

[Guest]

Peo,

It's working halfway. The formula works for space, but not for blank.

When a valid number is entered, "Deleted" and then hit the return key, cell
A1 is back to "blank".

Do you have another solution? Thanks in advance.

 

[Peo Sjoblom]

You don't enter a blank, you clear the cell of it's content
There is no data validation that will stop you from clearing the contents of
a cell
That would take an event macro but of course macros can be bypassed when you
open the workbook. You can't really "idiot proof" a workbook