I have this template within my Chembox
{{Molar mass calculator|
|Ag ={{{Ag|}}}
|As ={{{As|}}}
|Au ={{{Au|}}}
|B ={{{B|}}}
|Ba ={{{Ba|}}}
|Bi ={{{Bi|}}}
|Br ={{{Br|}}}
|C ={{{C|}}}
|Ca ={{{Ca|}}}
|Cl ={{{Cl|}}}
|Co ={{{Co|}}}
|Cu ={{{Cu|}}}
|F ={{{F|}}}
|Fe ={{{Fe|}}}
|H ={{{H|}}}
|I ={{{I|}}}
|K ={{{K|}}}
|Li ={{{Li|}}}
|N ={{{N|}}}
|Na ={{{Na|}}}
|Ni ={{{Ni|}}}
|O ={{{O|}}}
|P ={{{P|}}}
|Pt ={{{Pt|}}}
|S ={{{S|}}}
|Se ={{{Se|}}}
|Sr ={{{Sr|}}}
|Zn ={{{Zn|}}}
}}
as each of these element parameters are optional they can be null and
even when some parameters are provided I get the script error:
Lua error in Module:Molar_mass_calculator at line 8: attempt to perform
arithmetic on a nil value.
Backtrace:
1. *(tail call)*: ?
2. *Module:Molar_mass_calculator:8
<http://localhost/mediawiki/index.php?title=Module:Molar_mass_calculator&action=edit#mw-ce-l8>*:
in function "chunk"
3. *mw.lua:497*: ?
4. *(tail call)*: ?
5. *[C]*: in function "xpcall"
6. *MWServer.lua:87*: in function "handleCall"
7. *MWServer.lua:301*: in function "dispatch"
8. *MWServer.lua:58*: ?
9. *(tail call)*: ?
10. *mw.lua:141*: ?
11. *Module:Infobox:320
<http://localhost/mediawiki/index.php?title=Module:Infobox&action=edit#mw-ce-l320>*:
in function "preprocessArgs"
12. *Module:Infobox:373
<http://localhost/mediawiki/index.php?title=Module:Infobox&action=edit#mw-ce-l373>*:
in function "chunk"
13. *mw.lua:497*: ?
14. *(tail call)*: ?
15. *[C]*: in function "xpcall"
16. *MWServer.lua:87*: in function "handleCall"
17. *MWServer.lua:301*: in function "dispatch"
18. *MWServer.lua:40*: in function "execute"
19. *mw_main.lua:7*: in main chunk
20. *[C]*: ?
any ideas of how to overcome this error?
On 1/04/2015 7:28 PM, Ricordisamoa wrote:
To get parameters passed to the template, just call :getParent() in
the module: example
<https://test2.wikipedia.org/wiki/Special:Diff/155912>
Il 01/04/2015 11:13, Brenton Horne ha scritto:
Thanks for this. What should /Template:Molar mass calculator/ look
like? Currently I have:
{{#invoke:Molar mass calculator|calc}}
but this returns a null value when variables are provided.
On 1/04/2015 12:44 PM, Ori Livneh wrote:
On Tue, Mar 31, 2015 at 3:25 PM, Brenton Horne
<[email protected]>
wrote:
Thanks, I have also posted this question on Stackoverflow (
http://stackoverflow.com/questions/29377097/lua-module-
for-calculating-the-molar-mass-of-chemical-compounds) someone with Lua
skills but not so much with MediaWiki Lua templating and they gave
this
code:
|local AtomicWeightLookup= {
C= 12.01,
H= 1.001,
O= 16
}
local function Calculate(Input)
-- Input Example: {C = 2, H = 6, O = 1}
local Result= 0
-- Iterate through Input table
for Element,Quantityin next,Inputdo
-- If element is not found in table, assume 0 weight.
local AtomicWeight= AtomicWeightLookup[Element] or 0
-- Multiply
Result= Result+ Quantity* AtomicWeight
end
return Result
end
-- EXAMPLE
print(Calculate({C= 2, H= 6, O= 1}))|
but as you can see there's no variables in here that are set by
MediaWiki
templates, but it seems like a decent starting place.
Here you go:
https://test2.wikipedia.org/wiki/Module:Standard_atomic_weight
https://test2.wikipedia.org/wiki/Module:Molar_mass_calculator
demo:
https://test2.wikipedia.org/wiki/Module_talk:Molar_mass_calculator
Note that your table had an error -- the atomic weight of Fluorine is
assigned to symbol 'C' rather than 'F'.
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