Bug report #19736
Unable to get list of map layers from a map item in the layout
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | Expressions | ||
| Affected QGIS version: | 3.3(master) | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | invalid |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 27561 |
Description
If I write in a label item of the layout an expression like map_get(item_variables('Map 1'), 'map_scale') it returns the current scale of the "Map 1" item.
If I write map_get(item_variables('Map 1'), 'map_layers'), I get an empty label. Same thing with map_layer_ids.
History
#1
Updated by Nyall Dawson over 5 years ago
That's because the values aren't strings or numbers - you need to format them by converting the list to a string, etc. It's the same behaviour with geometries, dates, intervals, etc.
#2
Updated by Harrissou Santanna over 5 years ago
Ok I get it using something like array_to_string( array_foreach( map_get( item_variables( 'Map 1' ), 'map_layers'), layer_property(@element, 'name'))).
Just awesome!!! Thanks.
Then I remark that I get all the layers checked in the Layers panel and not only the layers whose features are visible in the map item. Likewise, when I lock the map item with a map_theme i get the map theme layers (regardless what is displayed in the main canvas, which is great).
BUT I wonder if there should not be a method to filter list of layers by map item content (like the legend item option).
#3
Updated by Nyall Dawson over 5 years ago
Ok, but that's a feature request ;)
#5
Updated by Giovanni Manghi over 5 years ago
- Resolution set to invalid