Return value from PYQt slot of QwebView to main window widget (PYQt python)

Question

i am building a desktop application using PyQt python which has a QwebBrowser. now i am running some function using javascript which is returning a value say abc as per following example.

class QWebView(QWebView):

 def contextMenuEvent(self,event):  
      menu = QMenu()
      self.actionShowXpath = menu.addAction("Show Xpath")  
      QObject.connect(self.actionShowXpath,SIGNAL("triggered()"),self,SLOT("slotshowxpath()"))

      menu.exec_(self.mapToGlobal(QPoint(event.x(),event.y())))   

      @pyqtSlot()
      def slotshowxpath(self):
           frame.evaluateJavaScript("var abc = function get()");
           result = frame.evaluateJavaScript("abc").toString()

            **some code code to put result in QLineEdit Widget**
            # something like below
            # xpath.setText(result)


def window():
   app = QtGui.QApplication(sys.argv)
   w = QtGui.QWidget()
   web = QWebView(w)
   web.load(QUrl("http://www.indiatimes.com/"))
   web.show()

   xpath = QtGui.QLineEdit("", w)
   sys.exit(app.exec_())

if __name__ == '__main__':
     window()

now, i want to put the value of abc in a QLineEdit widget("xpath") present in my application.please give me suggestion that how i can i do this?

Take a look at this post: PySide. JavaScript. Execute js an get result as a pure text or html — salomonderossi
– salomonderossi, Commented Apr 22, 2016 at 7:45
@salomonderossi thanks for the reference, but i want to know that how to put the value of result in the QLineEdit widget which is present in another def.?? — ricky rana
– ricky rana, Commented Apr 22, 2016 at 8:34
@salomonderossi please help if you have any idea of this question — ricky rana
– ricky rana, Commented Apr 25, 2016 at 2:38

7stud · Accepted Answer · 2016-04-26 04:53:15Z

1

I can't work up an example because QtWebkit has been removed from Qt 5.6, but if the problem you are having is because you don't have a reference to your QLineEdit, then pass the QLineEdit to your QWebView class's __init__() function:

def start_app():
    app = QtGui.QApplication(sys.argv)

    main_window = QtGui.QWidget()
    xpathInput = QtGui.QLineEdit(main_window)

    web_view = MyWebView(main_window, xpathInput)  #<===HERE
    web_view.load(QUrl("http://www.indiatimes.com/"))

    main_window.show()
    sys.exit(app.exec_())

Then in your QWebView class:

class MyWebView(QWebView):
    def __init__(self, parent, xpath_widget):
        #QWebView.__init__(parent)
        QWebView.__init__(self, parent)
        #or: super(MyWebView, self).__init__(parent)

        self.xpath_widget = xpath_widget

    def contextMenuEvent(self,event):  
        menu = QMenu()
        self.actionShowXpath = menu.addAction("Show Xpath") 

        #QObject.connect(
        #    self.actionShowXpath,
        #    SIGNAL("triggered()"),
        #    self,SLOT("slotshowxpath()")
        #)

        self.actionShowXpath.triggered.connect(self.show_xpath)

        menu.exec_(self.mapToGlobal(QPoint(event.x(),event.y())))   

    #@pyqtSlot()
    def show_xpath(self):
        frame = ...
        frame.evaluateJavaScript("var abc = function get()");
        result = frame.evaluateJavaScript("abc").toString()

        #some code code to put result in QLineEdit Widget**
        self.xpath_widget.setText(result)

But I think a better way to organize your code would be to do something like this:

class MyWindow(QMainWindow):
    def __init__(self):
        super(MyWindow, self).__init__()

        self.xpathInput = QtGui.QLineEdit(self)

        self.web_view = QWebView(self) 
        self.web_view.load(QUrl("http://www.indiatimes.com/"))

        self.menu = QMenu()
        self.actionShowXpath = self.menu.addAction("Show Xpath") 

        #QObject.connect(
        #    self.actionShowXpath,
        #    SIGNAL("triggered()"),
        #    self,SLOT("slotshowxpath()")
        #)

        self.actionShowXpath.triggered.connect(self.show_xpath)

        menu.exec_(self.mapToGlobal(QPoint(event.x(),event.y())))

    def show_path(self):
        frame = ...
        result = frame.evaluateJavaScript("abc").toString()
        self.xpathInput.setText(result)


def start_app():
    app = QtGui.QApplication(sys.argv)
    main_window = MyWindow()
    main_window.show()
    sys.exit(app.exec_())

edited Apr 26, 2016 at 4:53

answered Apr 25, 2016 at 12:10

7stud

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5 Comments

ricky rana Over a year ago

thanks for the help buddy, i will try this and update you within a few hours

ricky rana Over a year ago

its showing me an error- Traceback (most recent call last): File "GUI-Test.py", line 91, in <module> window() File "GUI-Test.py", line 75, in window web = QWebView(w,xpath) TypeError: __init__() takes exactly 2 arguments (3 given)

7stud Over a year ago

@ricky rana, GUI programming is an intermediate to advanced topic in computer programming. It's clear that you are a python beginner. You are not ready for PyQt programs yet. Nevertheless, see the change I made.

ricky rana Over a year ago

you are right, i am new to python but don't worry i will be a good programmer like you soon, thanks for the help but sorry to say that its again showing the error - File "GUI-Test.py", line 12, in init QWebView.__init__(parent) TypeError: unbound method __init__() must be called with QWebView instance as first argument (got QWidget instance instead).

7stud Over a year ago

@ricky rana: QWebView.__init__(self, parent). Or, you might be able to use super(): super(MyWebView, self).__init__(parent)

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