I do I hide a row depending on it's value - formula function.

[Steven Sparks]

If I set "DONE" in a custom text field column. How would I programically
check for this & not display the corresponding row.

 

[JackD]

Use a filter.
I have a few examples of constructing filters programmatically on my
website.
For example look at the trace macro.

http://masamiki.com/project/macros.htm

The basic process is to create and apply a filter.