Auto numbering in corresponding row

[Aussie Grid]

I need to have the corresponding row numbers auto update in column A, if it is blank, whenever new data is added.
i.e. If there is no row number in A7 when I enter data in D7 then auto enter the row number into the corresponding row in col A, A7 in this case. Obviously do nothing if there is a number in corresponding row A8 if cell G8 is selected etc.
I also need the numbers in A to auto update when a row is added or deleted.
Possible?
Any and all assistance appreciated.
Aussie Grid

 

[Sektor]

=row()

 

[superbeast326]

Do you mean D8,

if so
enter this in A1 and copy down.

=if (ISBLANK(D1)=FALSE(),row(a1)," ")

 

[Aussie Grid]

Sorry superbeast 326 but I need the auto numbers in col A to auto populate, if it is blank, when data is entered anywhere, not just a specific cell.
Thanks
Aussie Grid

 

[superbeast326]

Sorry, I thought I could help.

 

[Jon von der Heyden]

Try;

=IF(COUNTIF(B1:Z1,"<>"),ROW(),"")

Assumes entry range within B through Z. Change this reference as required.

 

[Aussie Grid]

Thank you Jon that is almost perfect. The only draw back is when a new row is added, the formula isn't in col A so there is no number.
Any ideas?
Thanks again
Aussie Grid

 

[superbeast326]

what does this, "<>" mean.

 

[superbeast326]

Thank you Jon that is almost perfect. The only draw back is when a new row is added, the formula isn't in col A so there is no number.
Any ideas?
Thanks again
Aussie Grid

Copy the formula down the entire column.

 

[Jon von der Heyden]

what does this, "<>" mean.

It means 'non blank'. So in essence the countif is counting the number of cells that contains *anything* other than a null string.