[Qgis-user] Select data from a specific layer
Delaz J
delazj at gmail.com
Mon May 17 16:05:49 PDT 2021
Hi Dario,
Could you try with 'Colore' and not "Colore" (pay attention to the
simple vs double quotes)?
Regards,
Harrissou
Le 18/05/2021 à 00:41, Dario C a écrit :
> 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 <mailto: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.
> Logo <https://spatialthoughts.com/>
> Ujaval Gandhi
> Spatial Thoughts
> mobile: +91-8095684687
> email: ujaval at spatialthoughts.com <mailto:ujaval at spatialthoughts.com>
> LinkedIn icon <https://www.linkedin.com/in/spatialthoughts/>
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>
>
>
>
>
> On Mon, May 17, 2021 at 2:47 AM Dario <dario955i at gmail.com
> <mailto: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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