[Qgis-user] Change properties of multiple layer at once

[L.W.]

as far as I unterstood right, if You use one style, you are able to set
in expression editor something like

if layer = "layer_id_1", '#99ff0000',

     if layer = "layer_id_2", '#9900ff00,

The code above show the way the right syntax is in help panel.

This works for nearly every option in the style dock, save this style.

Then go to Layer-dock and click with right mouse on the layer you edited
right now, point to "copy style > style".

If your layers are organized in a group (I recommend for this step),
than you can say "paste style" to this group and the style is on every
layer ... it's magic :-)


Am 01.04.2022 um 12:04 schrieb Roland Spielhofer via Qgis-user:
> Hi,
> thanks for the tip!
> The layers are all of the same type (content is the same, they
> represent different days).
> I wanted to preserve the different fill colors and just change the
> opacity and pen stroke.
> Therefore copy stlye does not work.
> Anyway, I adjusted the layers manually meanwhile - was just curious if
> there is an elegant way to do this and save time next time.
> Regards,
> Roland
> *Gesendet:* Freitag, 01. April 2022 um 10:37 Uhr
> *Von:* "L.W. via Qgis-user" <qgis-user at lists.osgeo.org>
> *An:* "Raymond Nijssen" <r.nijssen at terglobo.nl>, qgis-user at lists.osgeo.org
> *Betreff:* Re: [Qgis-user] Change properties of multiple layer at once
> May you change the style itself and set the same style to all layers.
>
> You can change i.e. color of lines by "type of line" / attribute values
> so you can use one style for multiple layers.
>
>
> Am 01.04.2022 um 10:13 schrieb Raymond Nijssen via Qgis-user:
> > Don't know how to do that using the GUI, but for the opacity you can
> > use these 2 lines of python in the QGIS python console. It will set
> > all your selected layers to 50% opacity.
> >
> >
> > for layer in iface.layerTreeView().selectedLayers():
> >     layer.setOpacity(.5)
> >
> >
> > I think the stroke style is harder to change because all these layers
> > can have different symbologies.
> >
> > Hope it helps!
> > Raymond
> >
> >
> > On 01-04-2022 09:47, Roland Spielhofer via Qgis-user wrote:
> >> Hi,
> >> I have a set of similar layers where I would like to change certain
> >> properties for all layers in the same way.
> >> * change opacity to 50%
> >> * change stroke style to "no pen"
> >> When I select multiple layers and open properties -> symbology, I
> >> just change the styling of the first layer, not for all.
> >> Is there a way to do this?
> >> Regards,
> >> Roland
> >>
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