on January 4, 2023

List all Unavailable layers in QGIS (3.x) project with PyQGIS

Geographic Information Systems

How do you make all layers visible in QGIS?

Right-click on the layer and in the context menu, select Set Layer Scale Visibility.

How do I get my table of contents back in QGIS?

Right-click on the Tools icons area (see the red dot on the screenshot below) will display a contextual-menu, then choose “Layers”. It will restore the TOC on the left panel. If you can’t see it directly, you will see a new “Layers” tab at the bottom.
 

Which tool you used to load vector layers in QGIS?





The quickest way to open and display a vector layer in QGIS is the addVectorLayer() method of the QgisInterface : vlayer = iface. addVectorLayer(path_to_airports_layer, “Airports layer”, “ogr”) if not vlayer: print(“Layer failed to load!”)

How to add vector layer in QGIS using Python?

The quickest way to open and display a vector layer in QGIS is the addVectorLayer function of the QgisInterface: layer = iface. addVectorLayer(“/path/to/shapefile/file. shp”, “layer name you like”, “ogr”) if not layer: print “Layer failed to load!”

Why are layers not showing in QGIS?

One possible issue is that the Layer Order is being set by the Layer Order panel. Then make sure the “Control rendering order is not ticked, and the Layer Order panel is greyed out.
 



How do I reveal all layers?



Show / Hide Layers



Hold down “Alt” (Win) / “Option” (Mac) and click on the Layer Visibility icon to temporarily hide all the other layers. To turn all the layers back on again, hold down Alt (Win) / Option (Mac) and click again on the same Layer Visibility icon.

How do I fix table of contents?

Format or customize a table of contents

  1. Go to References > Table of Contents.
  2. Select Custom table of contents.
  3. Use the settings to show, hide, and align page numbers, add or change the tab leader, set formats, and specify how many levels of headings to show. For more info, see Custom table of contents .


Why isn’t my table of contents picking up headings?

Yes, Tables of Contents have Styles, too



(Yep, there are Styles for that.) The TOC Styles aren’t going to pick up Heading Styles’ formatting, because you could, for example, want that to display in all caps in the body of the brief but in sentence case or initial caps in the TOC.
 

How do you unlock a table of contents?

Quote from video:



How do you make multiple layers visible?

Click the eye icon next to a layer to toggle the visibility on or off. You can also click-and-drag up or down on multiple eye icons to toggle the visibility of multiple layers.

How do I reveal all layer masks?

With the “Graffiti” layer selected in the Layers panel, select Layer ► Layer Mask ► Reveal All. A white Reveal All layer mask will appear attached to the layer. The layer mask makes the “Graffiti” layer visible and hides the “Light Rim” layer underneath.
 

How do I unhide layers panel?

In the Layers panel, just click on the little Eye icon to the left of the layer’s thumbnail and it hides that layer from view. To see it again, click where the Eye icon used to be. To see just one particular layer (and hide all the rest), press-and-hold the Option (PC: Alt) key, and then click on the layer’s Eye icon.