Is there a formula for counting the number of fields entered in a multi-line text box?

You can't do this with QuickBase formulas because there is no looping or counting construct.

It is simple to do with script. If your multiline text field was fid=6 and the numeric counting field was fid=7 you could use this code with the image onload technique to do the job:

$("#_fid_6").on("change",function(){ $("#_fid_7").val($(this).val().split("\n").length)});

Great, thanks for the quick answer! I will try that and let you know how it works.

Or if you have a practical limit on the number of reports they enter, you could try something like this which works for up to 10 lines (and could be expanded to more):

var Number linei = ToNumber(Trim(Part([Reports], 1,"\n"))<>"");

var Number lineii = ToNumber(Trim(Part([Reports], 2,"\n"))<>"");

var Number lineiii = ToNumber(Trim(Part([Reports], 3,"\n"))<>"");

var Number lineiv = ToNumber(Trim(Part([Reports], 4,"\n"))<>"");

var Number linev = ToNumber(Trim(Part([Reports], 5,"\n"))<>"");

var Number linevi = ToNumber(Trim(Part([Reports], 6,"\n"))<>"");

var Number linevii = ToNumber(Trim(Part([Reports], 7,"\n"))<>"");

var Number lineviii = ToNumber(Trim(Part([Reports], 8,"\n"))<>"");

var Number lineix = ToNumber(Trim(Part([Reports], 9,"\n"))<>"");

var Number linex = ToNumber(Trim(Part([Reports],10,"\n"))<>"");

$linei + $lineii + $lineiii + $lineiv + $linev + $linevi + $linevii + $lineviii + $lineix + $linex

Has there been any update that will allow the count of multiple lines in a field.