Factorio Forums

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script.on_event( defines.events.on_player_created, function( event )
	create_gui( game.players[event.player_index] )
end )

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local function create_gui( player )
	local top = player.gui.top
	if top["supply-toggle-button"] then
		if player.force.technologies["rocket-silo"].researched ~= true then
			top["supply-toggle-button"].destroy()
		end
		return
	end

	if player.force.technologies["rocket-silo"].researched then
		top.add{ type = "button", name = "supply-toggle-button", caption = { "supply-toggle-button-caption" } }
	end
end

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Error while running event on_player_created (ID 24)
__Xter_Server_MOD__/control.lua:45: attempt to call global 'create_gui' (a nil value)

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script.on_event(defines.events.on_player_created, function(event)
	create_change_player_color_button_for_player(game.players[event.player_index])
end)

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local function create_change_player_color_button_for_player(player)
	local top = player.gui.top
	if not top[player_color_defines.names.gui.change_color_button] then
		top.add{type = "button", name = player_color_defines.names.gui.change_color_button, style = player_color_defines.names.gui_style.change_color_button, tooltip = {"gui.change-player-color"}}
	end
end