Скачать или смотреть Drill-down (cascading) forms in QGIS Value Relation

Drill-down (cascading) forms in QGIS Value Relation.

“Value Relation Widgets” allows the implementation of complex, dynamic filters within QGIS attribute forms. The functionality can be used to implement “drill-down” forms within QGIS, where the values available in one field depend on the values of other fields

When implemented, this feature will allow users to create “value-relation” expressions based on the current value of another field in the same form. When the user modifies a field’s value, the choices available in all related fields are filtered to match the new value – allowing a hierarchical filtering strategy (drill-down, or cascading) inside a form. For a detailed exploration of the feature, a video tour demonstrating a proof-of-concept of the proposed changes can be viewed below.

   • QGIS Value Relation Widget Enhancements  


Reference: https://north-road.com/drill-down-cas...