How to get text in QlineEdit when QpushButton is pressed in a string?

Question

I am trying to implement a function. My code is given below.

I want to get the text in lineedit with objectname 'host' in a string say 'shost' when the user clicks the pushbutton with name 'connect'. How can I do this? I tried and failed. How do I implement this function?

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *


class Form(QDialog):
    def __init__(self, parent=None):
        super(Form, self).__init__(parent)

        le = QLineEdit()
        le.setObjectName("host")
        le.setText("Host")
        pb = QPushButton()
        pb.setObjectName("connect")
        pb.setText("Connect") 
        layout.addWidget(le)
        layout.addWidget(pb)
        self.setLayout(layout)

        self.connect(pb, SIGNAL("clicked()"),self.button_click)

        self.setWindowTitle("Learning")

    def button_click(self):
    #i want the text in lineedit with objectname 
    #'host' in a string say 'shost'. when the user click 
    # the pushbutton with name connect.How do i do it?
    # I tried and failed. How to implement this function?




app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()

Now how do I implement the function "button_click" ? I have just started with pyQt!

score 67 · Accepted Answer · edited Jun 11 '21 at 15:34

67

My first suggestion is to use Qt Designer to create your GUIs. Typing them out yourself sucks, takes more time, and you will definitely make more mistakes than Qt Designer.

Here are some PyQt tutorials to help get you on the right track. The first one in the list is where you should start.

A good guide for figuring out what methods are available for specific classes is the PyQt4 Class Reference. In this case, you would look up QLineEdit and see the there is a text method.

To answer your specific question:

To make your GUI elements available to the rest of the object, preface them with self.

import sys
from PyQt4.QtCore import SIGNAL
from PyQt4.QtGui import QDialog, QApplication, QPushButton, QLineEdit, QFormLayout

class Form(QDialog):
    def __init__(self, parent=None):
        super(Form, self).__init__(parent)

        self.le = QLineEdit()
        self.le.setObjectName("host")
        self.le.setText("Host")
        
        self.pb = QPushButton()
        self.pb.setObjectName("connect")
        self.pb.setText("Connect") 
        
        layout = QFormLayout()
        layout.addWidget(self.le)
        layout.addWidget(self.pb)

        self.setLayout(layout)
        self.connect(self.pb, SIGNAL("clicked()"),self.button_click)
        self.setWindowTitle("Learning")

    def button_click(self):
        # shost is a QString object
        shost = self.le.text()
        print shost
        

app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()

edited Jun 11 '21 at 15:34

Sean

17
9

answered Jun 10 '10 at 19:59

tgray

8,826
5
36
41

I'm getting this error! AttributeError: 'Form' object has no attribute 'le' – esafwan Jun 10 '10 at 20:19
2

You need to name it `self.le` in your `__init__` function. Everywhere you use it in your `Form` class it should be `self.le`. – tgray Jun 10 '10 at 20:30
I didn't get you. Sorry, I'm just getting started with these... i used the code which you gave, and the error came. I think in it, its already self.le – esafwan Jun 10 '10 at 20:48
I don't get the error when I run the above code. I'm using Python 2.6, what version are you using? – tgray Jun 10 '10 at 21:09
Python 2.6.5 under ubuntu 64 bit. – esafwan Jun 11 '10 at 14:15
It worked! Thanx. There was a syntax error. Thank You Very Much! – esafwan Jun 11 '10 at 14:20
2

shost = self.le.text() will probably give a QString output. Cast it with a str() to get a meaningfull text. – Arindam Roychowdhury Nov 28 '17 at 11:28

score 2 · Answer 2 · answered Jun 11 '10 at 06:46

The object name is not very important. what you should be focusing at is the variable that stores the lineedit object (le) and your pushbutton object(pb)

QObject(self.pb, SIGNAL("clicked()"), self.button_clicked)

def button_clicked(self):
  self.le.setText("shost")

I think this is what you want. I hope i got your question correctly :)

score 2 · Answer 3 · answered Aug 26 '20 at 07:31

Acepted solution implemented in PyQt5

import sys
from PyQt5.QtWidgets import QApplication, QDialog, QFormLayout
from PyQt5.QtWidgets import (QPushButton, QLineEdit)

class Form(QDialog):
    def __init__(self, parent=None):
        super(Form, self).__init__(parent)

        self.le = QLineEdit()
        self.le.setObjectName("host")
        self.le.setText("Host")

        self.pb = QPushButton()
        self.pb.setObjectName("connect")
        self.pb.setText("Connect")
        self.pb.clicked.connect(self.button_click)

        layout = QFormLayout()
        layout.addWidget(self.le)
        layout.addWidget(self.pb)
        self.setLayout(layout)

        self.setWindowTitle("Learning")

    def button_click(self):
        # shost is a QString object
        shost = self.le.text()
        print (shost)


app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()

score 0 · Answer 4 · answered Oct 23 '21 at 12:52

0

Short and general answer is:

self.input = QLineEdit()
your_text = self.input.text()

answered Oct 23 '21 at 12:52

Scott

4,974
6
35
62

How to get text in QlineEdit when QpushButton is pressed in a string?

4 Answers4

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