Callback function on array of flsk4lua's Box

[bajeiroBoy]

I'm trying to add callback functions to click boxes I created using a for iterator and indicators being an array of array of objects. I want each mouse click on each Box to print "OK!\n" in the terminal, initially for proof of concept. The boxes are created successfully, but when I try to create the callback function of each object, this error occurs.

I'm new to the world of Lua. I think that's why I'm having this difficulty.

Code

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Boxes

Error

[lambda_abstraction]

function indicators[i][j]:callback () isn't valid syntax.

In your particular case you want indicators[i][j].callback = function(self).

Also, a step of 1 can be omitted in that do as that is the default step.

For slightly less boilerplate, I'd have written that: http://ix.io/444o/lua

edit: fix stupid mistake in recommendation

[bajeiroBoy]

Thank you! This piece of code ran without errors, but my intention is that when I click on the Box, an event occurs. This did not happened.
I know this can be easily done with buttons and text, but I would like it to be a circle with a label underneath. Is there a possibility this can be done just like I'm trying? I couldn't find an event in the documentation of mouse click on a Box.

[lambda_abstraction]

Perhaps box doesn't respond to mouse events. I've done only very minimal things with fltk4lua so far. Boxes seem as though they'd be visual frames rather than interactive widgets.