[FIXED] How to enable/disable button when QComboxBox and QLineEdit are activated

Issue

I cannot get a push-button enabled when both a text box is filled and a combox box item is selected.

I have the following code, which enables the button as soon as I enter text, but have no selected combobox item:

self.combo_box.currentIndexChanged[int].connect(self.showbutton)
self.textbox.textChanged.connect(self.showbutton)

def showbutton(self,index):
    self.enableNewButton.setEnabled((index != -1) and bool(self.textbox.text()))

So I then did a print(index) and I do see the proper index being printed when I select a combo box item; but I also see each character printed as well when I enter stuff in the text box.

I have no problems enabling buttons based on multiple text input boxes but this one is not working for me.

Solution

The textChanged signal sends the current text, which cannot ever be equal to -1. So rather than using the parameters emitted by the signals, you should directly check both values via the widgets themselves, like so:

class Window(QtWidgets.QWidget):
    ...
    def showbutton(self):
        self.enableNewButton.setEnabled(
            self.combo_box.currentIndex() >= 0 and bool(self.textbox.text()))
    

Answered By - ekhumoro