[darktable-dev] Need you help with my darktable lua script

[Holger Klemm]

Hello,
I need your help to correct my lua script.
I have a darktable lua script with which I want to control via a combobox the 
check button.

The demo script below works but generates the following error:
demo.lua:34: attempt to index global 'check_button1' (a nil value)              
                                        
stack traceback:                                                                
                                                                                
            
        [C]: in function '__newindex'  


I have tried everything, but no script without error message.

What am I doing wrong?
Can someone give me an example how to control the check button via the combo 
box without error message?

Many Thanks
Holger




local dt = require "darktable"

dt.configuration.check_version(...,{4,0,0})

local combobox = dt.new_widget("combobox")
{
    label = "Combobox", 
    value = 1, "Button  1 is checked", "Button 1 and 2 is checked", "Nothing 
is checked",
    
    changed_callback = function(selection) 
      if (selection.value == "Button  1 is checked") then
        check_button1.value = true 
        check_button2.value = false
      elseif   (selection.value == "Button 1 and 2 is checked") then  
        check_button1.value = true 
        check_button2.value = true
      elseif   (selection.value == "Nothing is checked") then    
        check_button1.value = false
        check_button2.value = false
      end    
    end
}


check_button1 = dt.new_widget("check_button")
{ 
label = "Button 1", 
value = true
}

check_button2 = dt.new_widget("check_button")
{ 
label = "Button 2", 
value = false
}


dt.register_lib(
  "demo",     -- Module name
  "demo",     -- name
  true,                -- expandable
  false,               -- resetable
  {[dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_RIGHT_CENTER", 100}},   
-- containers
  dt.new_widget("box") -- widget
  {
    orientation = "vertical",
    combobox,
    check_button1,
    check_button2,
  },
  nil,
  nil
)
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local dt = require "darktable"

dt.configuration.check_version(...,{4,0,0})

-- add a new lib

local combobox = dt.new_widget("combobox")
{
    label = "Combobox", 
    value = 1, "Button  1 is checked", "Button 1 and 2 is checked", "Nothing is checked",
    
    changed_callback = function(selection) 
      if (selection.value == "Button  1 is checked") then
        check_button1.value = true 
        check_button2.value = false
      elseif   (selection.value == "Button 1 and 2 is checked") then  
        check_button1.value = true 
        check_button2.value = true
      elseif   (selection.value == "Nothing is checked") then    
        check_button1.value = false
        check_button2.value = false
      end    
    end
}



check_button1 = dt.new_widget("check_button")
{ 
label = "Button 1", 
value = true
}

check_button2 = dt.new_widget("check_button")
{ 
label = "Button 2", 
value = false
}



dt.register_lib(
  "demo",     -- Module name
  "demo",     -- name
  true,                -- expandable
  false,               -- resetable
  {[dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_RIGHT_CENTER", 100}},   -- containers
  dt.new_widget("box") -- widget
  {
    orientation = "vertical",
    combobox,
    check_button1,
    check_button2,
  },
  nil,-- view_enter
  nil -- view_leave
)