Adding Validation to data entry in-line

Hi Everyone

Thank you for all the help I've been given/offered over the last few months - really appreciate it. My screens for batch data entry for samples is going well... but I have another question that I hope someone can answer.

Basically I have a function called validateReal that I use extensively when entering data into a normal form/modal to ensure only digits and 1 decimal place can be entered - and it works well. I assign it to keypress by using the following example:

$('[id^=bacteriaCFU]').keypress(validateReal);

and it Just works. So now i want to add this functionality to my batch data entry form when editing a field such as the following:

Using Firefox I can see the field id created is DTE_Field_tblAHUsample-yeastCFU

However, this is created when the cursor is pressed on the field so the following won't be assigned, I assume:

$('[id^=DTE_Field_tblAHUsample-yeastCFU]').keypress(validateReal);

Does anyone have any ideas on how I can assign the function to this input when I click it?

I assume, but probably wrong, expanding this:

         $('#example').on( 'click', 'tbody td.editable', function (e) {
              editor.inline( this );
          } );

Thank you in advance for any help given...