[Qgis-user] Select data from a specific layer

[Dario C]

  Hi, thank you for your reply, but I still don't understand how to do...
sorry

i tried to write this code in colour expression, but I don't understand
what "value" is in get_feature :

CASE
When
get_feature('V_TB_ATTIVITA_PT_NR',"Colore",'N')='N' then color_rgb (0,0,0)
When
get_feature('V_TB_ATTIVITA_PT_NR',"Colore",'R')='R' then color_rgb (255,0,0)
END

Consider that I have a virtual field called "Colore" where I have 'N' or
'R' in case it is black or red color.

Thank you for your kind availability.

cheers

Il giorno lun 17 mag 2021 alle ore 09:09 Ujaval Gandhi <
ujaval at spatialthoughts.com> ha scritto:

> You can select the layer under 'Plot Parameters' and its attributes will
> be available in the expression. (see attached screenshot).
>
> If you need to get the attribute from another layer, you can use the
> get_feature() function to get feature from another layer by specifying the
> layer name.
> [image: Logo] <https://spatialthoughts.com/>
> Ujaval Gandhi
> Spatial Thoughts
> mobile: +91-8095684687
> email: ujaval at spatialthoughts.com
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> Twitter icon] <https://twitter.com/spatialthoughts>
>
>
>
> On Mon, May 17, 2021 at 2:47 AM Dario <dario955i at gmail.com> wrote:
>
>> Hi,
>>
>> I should get some data from a specific field of a specific layer but I’m
>> stuck.
>>
>> I’m using “Data Ploty” plug-in and I’d like to customise the colour of
>> the chart using expression.
>> As I’m working on layout I can’t see any field into expression menu, so I
>> need to call a specific layer and then the field.
>> I’d like to write something like that but, of course, selecting the
>> correct layer:
>>
>> CASE
>> WHEN "Civici" = 'Neri' THEN color_rgb(0,0,0)
>> ELSE color_rgb (255,0,0)
>> END
>>
>>
>> Thank you in advance.
>>
>> Cheers
>>
>> _
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