Database form as QGIS plugin with PyQGIS and QtDesigner

Question

I try to build a QGIS plugin to add data into a SpatiaLite database. All relevant tables are load into the QGIS Layers Panel. At first, I want to select a feature in table_1. This table has geometries and could also select in map canvas. I would specify this in a QgsFeatureListComboBox. My approach is

self.dlg.mFeatureListComboBox_losp.setSourceLayer(table_1)

With this, I get the combo box and can choose a feature. But how to select the feature by the combobox and work with this feature and the information?

Answer 1

If you use QgsFeaturePickerWidget instead of QgsFeatureListComboBox, you can get the selected feature in the combobox easily.

Sample script for the plugin:

def run(self):

    ...
    ...

    layer = self.iface.activeLayer()

    picker = self.dlg.mFeaturePickerWidget
    picker.setLayer(layer)
    picker.setDisplayExpression('$id') #show ids in combobox

    def select_feature():
        layer = self.iface.activeLayer()
        layer.removeSelection()
        
        feature = picker.feature()

        # Do whatever you need with feature

        # For example, select the feature
        layer.select(feature.id())


    button = self.dlg.pushButton
    button.clicked.connect(select_feature)

    # show the dialog
    self.dlg.show()

    ...
    ...

Using the sample script, after you choose a feature id in combobox, you can get all attributes and geometry of the feature using picker.feature().