It's a subtle point. The key is that UV_color (and UV_text) have to be
*functions*, so your search list extension has to return something that
evaluates to a function. Something like this (NOT TESTED):
from weewx.cheetahgenerator import SearchList
# Given a UV value, this function will return an appropriate color
def get_uv_color(value):
if value > 5.0:
return "red"
else:
return "blue"
class MyUV(SearchList):
def __init__(self, generator):
SearchList.__init__(self, generator)
def get_extension_list(self, timespan, db_lookup):
return [{'UV_color' : get_uv_color}]
Now when Cheetah scans the search list, looking for 'UV_color', it will get
a hit with class MyUV. What gets returned is a function, which it then
calls with your value as a parameter.
-tk
On Tue, Jun 27, 2017 at 1:29 AM, Neil Trimboy <[email protected]>
wrote:
> Tom,
>
> Thanks for the pointer.
> I've made some progress with this but none of the search list extension
> examples in the Customisation guide and those I can find referenced in
> GoogleGroup and in other extensions seem to pass a parameter from the
> webpage.html.tmpl
>
> So I have got an extension working, filling in a (hardcoded) coloured <td>
> cell as I wanted along with passing configuration in from skin.conf
>
> but I am unable (=don't know how) to pass the actual value down to and
> receive in my function.
>
> ie
> I can do
> <td class="stats_data" style="background-color: $UV_color">$current.UV
> </td>
>
> but am struggling on
> <td class="stats_data" style="background-color: $UV_color($current.UV.raw)
> ">$current.UV</td>
>
> any pointers appreciated, thanks
>
> On Monday, 26 June 2017 01:34:28 UTC+12, Tom Keffer wrote:
>>
>> There's an example in the Wiki
>> <https://github.com/weewx/weewx/wiki/Colored%20UV%20index> of how to do
>> this, but I don't think it's particularly efficient.
>>
>> A search list extension would probably be the most elegant. Then you
>> could do something like:
>>
>> <tr>
>> <td class="stats_label">UV</td>
>> <td class="stats_data" style="background-color:
>> $UV_color($current.UV.raw)">$current.UV $UV_text($current.UV.raw)</td>
>> </tr>
>>
>> The functions $UV_color() and $UV_text() would return an appropriate
>> color and warning, respectively, depending on their argument. An elegant
>> touch would be for $UV_text() to get its strings out of skin.conf,
>> making it easy to internationalize the text.
>>
>> -tk
>>
>>
>> On Sun, Jun 25, 2017 at 3:06 AM, Neil Trimboy <[email protected]>
>> wrote:
>>
>>> Just wondering if embedding these colour mappings inside templates is
>>> the correct way to solve the problem.?
>>>
>>> There are several instances when this may be wanted : UV, Heat Index,
>>> HumidyIndex and others all of which have, I believe, standardised colours
>>> for defined ranges AND standardised textual descriptions (ie Danger - see
>>> http://www.nws.noaa.gov/om/heat/heat_index.shtml)
>>>
>>> I would suspect the elegant way to solve this might be to extend
>>> something in units.py ?
>>>
>>> Any thoughts or pointers from any experts for me to dabble with
>>> appreciated. Thanks
>>>
>>>
>>> On Sunday, 4 January 2015 20:32:17 UTC+13, Liz wrote:
>>>>
>>>> I've been playing with this on the standard skin, and have left further
>>>> comments on the wiki
>>>> https://sourceforge.net/p/weewx/wiki/Colored%20UV%20index/
>>>>
>>>> I had some problems with the wiki formatting, which just wouldn't let
>>>> me put in an example of code to change the font colour. I thought that
>>>> red font on red background wasn't going to be useful, and switched all
>>>> of mine to black font.
>>>>
>>>> Liz
>>>>
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