Sort of in the area you are asking about:
See the Action tool
Under Windows this can invoke a batch file to display the result of an sql for
data about the (Postgis) feature clicked on. Even easier under Linux with a
bash script. If one of the fields is an image file, you can create an action to
display the image associates with the feature. A useful bit of functionality...
But to do exactly what you are asking, I think the Attribute table does this,
so it is a matter of explaining the steps to your users, rather than writing
code...
If you select a set of features in a Postgis (or most type of layer) layer
rendered on the map, QGIS highlights the selected ones as defined in the
project properties. Open the Attribute table for the layer, you will see the
selected features, not only highlighted on the map, but also in the attribute
list. Click the "move selected features to top" button, and the
selected/highlighted features will always be at the top of the list. The
attribute table has buttons at the top to zoom & pan to selected features...
Cheers,
Brent
From: SEGGIE Graeme <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Friday, February 24, 2017 6:48 AM
Subject: [Qgis-user] Simple methodology for user / data / map interactivity?
<!--#yiv2791882570 _filtered #yiv2791882570 {font-family:"Cambria
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like to use QGIS as a visual / interactive front to somePostGIS data and am not
sure what the best route to doing so is. Happy to explore further myself, but
wanted to get some input on what needs to be joined up to get started on
building a little process. Basically, if I wanted to present a map of
features and have a button (like the attribute information one) which a user
would click then use to select features, I want this to run a SQL query which
to get related features for example and highlight them on the map view,
possibly pan to the extent of the newly selected feature set. Does this
sound like a plugin – or would that be taking things too far? Would the best
way for the dynamic layer to be setup, to be a view – empty except when
populated by the query and styled to be dominant over the full set of features?
As a simple example, say I had a district zone system of polygons and I
wanted a user to be able to click on any polygon, and have all the neighbouring
polygons highlighted, centred and fill the map view as fully as possible. What
would be the best / simplest approach to this? Graeme
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