CODEWITHSUNDEEP
pythonpyqt5qlineeditqpushbutton
Jefer P. Bulan
Jefer P. Bulan

Reputation: 85

Python: How to enable button if the QlineEdit is Filled

Can someone tell me what approach or what logic so the QPushbutton will be enable if all the fields are not empty. I'm making a simple form that you can only push the button if the fields are not empty.

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(392, 232)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(140, 60, 113, 20))
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(140, 90, 113, 20))
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(100, 60, 47, 13))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(100, 90, 47, 13))
        self.label_2.setObjectName("label_2")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setEnabled(False)
        self.pushButton.setGeometry(QtCore.QRect(300, 170, 75, 23))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

GUI

This is a sample code.

Upvotes: 5

Views: 2326

Answers (1)

eyllanesc
eyllanesc

Reputation: 244282

You have to connect the textChanged signals to a slot where you verify the condition required to enable or disable the button:

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        # ...

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.lineEdit.textChanged.connect(self.on_text_changed)
        self.lineEdit_2.textChanged.connect(self.on_text_changed)

    @QtCore.pyqtSlot()
    def on_text_changed(self):
        self.pushButton.setEnabled(bool(self.lineEdit.text()) and bool(self.lineEdit_2.text()))

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

Upvotes: 6

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