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Welcome to the QGIS-Layergroup-Filter wiki!

Sample Project:

Feel free to use sample project and data to play around.

• Link to sample project and data. (UNZIP before opening)
• Link to example xml file .

How to set a filter to a layer group in QGIS:

• Create a xml file to discribe the wanted filter settings for your Qgis Project. (see example)
• Load the xml file to the project by using the "..." button.
• Select a preset as described in the xml from the "filter preset" combobox.
• Select the layer group. (all sub groups are also included)
• Type or select the filter value. (click button to get the possible values)
• Click "Replace Filters" to delete al current filters of the selected group and replace them with a preset.
• Click "Add Filters" to keep al current filters of the selected group and add a constraint using a "AND" relation.

How to delete all filters of a layer group in QGIS:

• Select the layer group. (all sub groups are also included)
• Click "Clear Filters"

How to use a value relation between layers:

• discribe the value relation in the XML file. (see example)
• if a value matches multiple keys, different constraints will be set using an OR reletion.