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Editorial Team
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Asked: 2026-05-25T02:27:13+00:00

I use Qt Designer to build my UI layout. On the layout, I have

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I use Qt Designer to build my UI layout. On the layout, I have a combobox named cb_fac_cd. In my code I have a function that will automatically build a combobox based on the list I’m attempting to build. I have a lot of these lists defined in the database and this function spits out a QComboBox.

Unfortunately, until now I’ve only used this function to add cellWidgets to QTableWidgets. It works perfectly there. Now I want to populate this preexisting combobox.

It seems that a simple
self.ui.cb_fac_cd = makeComboBox('FACILITIES') doesn’t work. I can see that the function returns the QComboBox as usual, but the cb_fac_cd combobox remains unpopulated.

How can I copy or assign the returned combobox to the one build in Qt Designer?

I am using PyQt, but that shouldn’t make any difference.

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1 Answer

  1. Editorial Team

    As far as I know, you cannot replace objects which are part of the .h files generated by Qt’s UIC mechanism (though I cannot confirm that 100% right now).

    What I usually do in such cases is to have an empty layout in the ui file and then do the following:
    (Note that I’m using Qt/C++ syntax as I don’t know the pyqt syntax but I think you will get the idea)

    QComboBox* pNewComboBox = makeComboBox( "FACILITIES" );
ui.pComboBoxLayout->addWidget( pComboBox );

    Additionally, if possible for your program, consider using an enumeration rather than a string for your makeComboBox function. This is usually faster and safer.

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