PyQt5 – Finding item through their role in comboBox

In this article we will see how we can find the item through the role in combo box, by default when we create a combo box and add items to it no role is set to the items. In order to set role use setItemData method. In order to find the item we will use findData method.

Syntax : combo_box.findData(role) 

Argument : It takes string as argument i.e role 

Return : It returns index of the given role if role doesn’t exist it return -1

Below is the implementation – 

Python3

# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys


class Window(QMainWindow):

    def __init__(self):
        super().__init__()

        # setting title
        self.setWindowTitle("Python ")

        # setting geometry
        self.setGeometry(100, 100, 600, 400)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()

    # method for widgets
    def UiComponents(self):

        # creating a combo box widget
        self.combo_box = QComboBox(self)

        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 120, 30)

        # geek list
        geek_list = ["Geek", "Geeky Geek", "Legend Geek", "Ultra Legend Geek"]

        # adding list of items to combo box
        self.combo_box.addItems(geek_list)

        # setting roles to the items
        self.combo_box.setItemData(0, "First role")
        self.combo_box.setItemData(1, "Second role")
        self.combo_box.setItemData(2, "Third role")
        self.combo_box.setItemData(3, "Fourth role")

        # finding item through role
        index = self.combo_box.findData("Third role")

        # creating label to show index
        label = QLabel("Third role index = " + str(index), self)

        # setting geometry of label
        label.setGeometry(200, 200, 200, 30)




# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())

Output :