A few ideas:

1. Use a popup
2. Use edit row action
3. Use a row drawer
4. Use custom renderer and set editable based on “some” event - would need to explore

Just off the top of my head as options to consider.

That’s pretty much your options… 

We need to do something very similar.  How can we make a field editable in the Table when the Row Mass Action checkbox is selected?   Is this possible? Are there any examples out there? 

In our case, the Table presents the user with all of the Services offered by a Department.  The user checks the box (mass action) for each row (service) that they want to add to their Project.  They would then be able to add a value to the Quantity column.  

I am looking for some guidance on how #4 above might work.  Could checking the Mass Action Checkbox be considered an “Action” that could trigger a renderer to make the Quantity field editable for that Row?

I would like to see that as well!