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I have a layer say 'Cities'. There is a column called 'NAME_1' in the layer. My GUI has a QComboBox in which i want the values of column 'NAME_1' alone to be displayed in the drop down of the combo box.

Can anyone help me in providing snippet in Python for getting a value from a particular column and displaying it in the combo box?

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  • Next time, tell us what you've tried.
    – Germán Carrillo
    Feb 11, 2015 at 19:36
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    Sure next time it will be posted.
    – User123
    Feb 12, 2015 at 4:03

1 Answer 1

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Since there is no custom QGIS GUI widget for that (at least I couldn't find it), you could try something like this:

from PyQt4.QtGui import QComboBox

lyr = iface.activeLayer()
idx = lyr.dataProvider().fieldNameIndex( 'NAME_1' ) 
uv = lyr.dataProvider().uniqueValues( idx )
cb = QComboBox()
cb.addItems( uv )

Note that we are obtaining unique values of the field NAME_1, because I guess that's the desired behavior. Otherwise you would be showing your users a list with repeated values, which is not really ideal for a QComboBox.

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  • Is it not the same as setting a layers Properties > Fields > Edit Widget to Unique Values?
    – Jakob
    Feb 12, 2015 at 7:57
  • @gcarrillo: The above snippet works fine for shapefile layer. When I tried with spatialite layer, it throws an error "QCombo.addItems(QStringList): argument 1 has unexpected type 'list'. I am curious why this happens in spatialite layer.
    – User123
    Feb 12, 2015 at 12:50
  • @Jakob Not really, Ahamed wants to put a ComboBox in his plugin's dialog.
    – Germán Carrillo
    Feb 12, 2015 at 13:11
  • @AhamedFarook Cannot replicate the issue you mentioned. I tried on a SpatiaLite layer and still get unique values to populate the QComboBox. Did you change something in the code?
    – Germán Carrillo
    Feb 12, 2015 at 14:46
  • I havenot change anything in the code. But the same code still works fine for shapefile layer and gives an error for spatialite layer. Wondering how?
    – User123
    Feb 12, 2015 at 16:29

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