Loading layer from ComboBox in QGIS?

Question

I made a plugin what has multiple combobox but i have problem with the information load from the second combobox it depends on the combobox 1st. In the first combo box, i can choose layers from the loaded ones.

    layers = self.iface.legendInterface().layers()
    layer_list = []
    for layer in layers:
         layer_list.append(layer.name())

    self.dlg.reteg.addItems(layer_list)

And the problem is that, in the second combobox i want a list from the selected layer's attribute names.

Answer 1

Just play with the signal layerChanged from QgsMapLayerComboBox

Below, you will find a simple example to get layer id with layer.id() when you change layer in QgsMapLayerComboBox. You could instead use the setLayer slot from QgsFieldComboBox to set the attributes you want to display in your second combobox (assuming you have both combo components QgsMapLayerComboBox and QgsFieldComboBox)

def print_layer_id(layer):
    print layer.id()
# I supposed reteg is the id of the QgsMapLayerComboBox
self.dlg.reteg.layerChanged.connect(print_layer_id)