[FIXED] How can I make a Button be added when entering everything correct in the username and password?

Issue

import sys

from PySide6.QtWidgets import QApplication, QWidget, QLabel, QPushButton, QLineEdit, QVBoxLayout, QHBoxLayout, QFrame

from PySide6.QtGui import QFont

class Login(QWidget):

    def __init__(self):

        super().__init__()

        self.start_ui()

    def start_ui(self):

        self.generar_formulario()

        self.show()

    def generar_formulario(self):

        self.main_layout = QVBoxLayout()

        container_user = QFrame(self)

        hbox_layout_user = QHBoxLayout(container_user)

        user_label = QLabel('USUARIO: ', container_user)

        self.user_input = QLineEdit(container_user)

        font = QFont('Arial', 26)

        font.setBold(True)

        user_label.setFont(font)

        hbox_layout_user.addWidget(user_label)

        hbox_layout_user.addWidget(self.user_input)

        container_password = QFrame(self)

        hbox_layout_password = QHBoxLayout(container_password)

        password_label = QLabel('CONTRASEÑA: ', container_password)

        self.password_input = QLineEdit(container_password)

        self.password_input.setEchoMode(QLineEdit.Password)

        

        password_label.setFont(font)

        hbox_layout_password.addWidget(password_label)

        hbox_layout_password.addWidget(self.password_input)

        self.main_layout.addWidget(container_user)

        self.main_layout.addWidget(container_password)

        self.button_validation = QPushButton('Validar', self)

        self.button_validation.clicked.connect(self.Validar_Credenciales)

        self.main_layout.addWidget(self.button_validation)

        

        self.resul_label = QLabel(self)

        #self.resul_label.setFont(QFont('Arial', 12))

        self.main_layout.addWidget(self.resul_label)

               

        

        container_user.move(50, 50)

        container_password.move(50, 150)

        self.button_validation.move(150, 250)

        self.resul_label.move(60, 350)

        

        #self.setLayout(self.main_layout)

    def Validar_Credenciales(self):

        usuario = "Pepe"

        password = "123"

        

        usuario_get = self.user_input.text()

        contraseña_get = self.password_input.text()

        

        if usuario_get == usuario and contraseña_get == password:

            self.resul_label.setText(f"\tBienvenido {usuario},\n  aqui tenemos recomendaciones de videos")

            self.resul_label.adjustSize()

                        

        else:

            self.resul_label.setText("Ingresa bien tu contraseña estupido")

            self.resul_label.adjustSize()

if __name__ == '__main__':

    app = QApplication(sys.argv)

    login = Login()

    sys.exit(app.exec())

I expected that when I entered everything was correct it would show me a button

Below the Label that says Welcome to the user

Solution

You can create the button but make it hidden until the password and username matches the desired values by listening for the QLineEdit.textChanged signal and checking the values entered into the two line edits every time the widgets contents are changed. Then you can call QPushButton.setHidden(False) to show the button that was hidden.

Although I do not recommend storing user credentials in this manner... here is an example:

import sys

from PySide6.QtWidgets import QApplication, QWidget, QLabel, QPushButton, QLineEdit, QVBoxLayout, QHBoxLayout, QFrame

from PySide6.QtGui import QFont

class Login(QWidget):

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

    def start_ui(self):
        self.generar_formulario()
        self.show()

    def generar_formulario(self):
        self.main_layout = QVBoxLayout()
        container_user = QFrame(self)
        hbox_layout_user = QHBoxLayout(container_user)
        user_label = QLabel('USUARIO: ', container_user)
        self.user_input = QLineEdit(container_user)
        font = QFont('Arial', 26)
        font.setBold(True)
        user_label.setFont(font)
        hbox_layout_user.addWidget(user_label)
        hbox_layout_user.addWidget(self.user_input)
        container_password = QFrame(self)
        hbox_layout_password = QHBoxLayout(container_password)
        password_label = QLabel('CONTRASEÑA: ', container_password)
        self.password_input = QLineEdit(container_password)
        self.password_input.setEchoMode(QLineEdit.Password)
        password_label.setFont(font)
        hbox_layout_password.addWidget(password_label)
        hbox_layout_password.addWidget(self.password_input)
        self.main_layout.addWidget(container_user)
        self.main_layout.addWidget(container_password)
        self.button_validation = QPushButton('Button', self)
        self.button_validation.setHidden(True)
        self.button_validation.clicked.connect(self.Validar_Credenciales)
        self.main_layout.addWidget(self.button_validation)
        self.resul_label = QLabel(self)
        #self.resul_label.setFont(QFont('Arial', 12))
        self.main_layout.addWidget(self.resul_label)
        container_user.move(50, 50)
        container_password.move(50, 150)
        self.button_validation.move(150, 250)
        self.resul_label.move(60, 350)
        self.usuario = "Pepe"
        self.password = "123"
        self.password_input.textChanged.connect(self.on_text_changed)
        self.user_input.textChanged.connect(self.on_text_changed)
        #self.setLayout(self.main_layout)

    def on_text_changed(self):
        usuario_get = self.user_input.text()
        contraseña_get = self.password_input.text()
        if usuario_get == self.usuario and contraseña_get == self.password:
            self.button_validation.setHidden(False)

    def Validar_Credenciales(self):
        usuario_get = self.user_input.text()
        contraseña_get = self.password_input.text()
        if usuario_get == self.usuario and contraseña_get == self.password:
            self.resul_label.setText(f"\tBienvenido {self.usuario},\n  aqui tenemos recomendaciones de videos")
            self.resul_label.adjustSize()
        else:
            self.resul_label.setText("Ingresa bien tu contraseña estupido")
            self.resul_label.adjustSize()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    login = Login()
    sys.exit(app.exec())

Answered By - Alexander