PyQt4 does not redirect me to the next page

问题

The code below works fine except one thing, it does not follow the sign-up link. However if I go to my actual browser and in console type:

document.getElementById("link-signup").click()

It will redirect me to the desired page. I was thinking that the problem accured because I didn't enable some feature in settings. but I'm not sure.

Thank's for any help

#! /usr/bin/env python2.7

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

class GrabberSettings(QWebPage):
    def __init__(self):
        QWebPage.__init__(self)
        self.settings().setAttribute(QWebSettings.AutoLoadImages, False)

class Grabber(QWebView):
    def __init__(self):
        QWebView.__init__(self)
        self.setPage(GrabberSettings())
        self.loadFinished.connect(self._loadComplete)
        self.doc = self.page().mainFrame().documentElement()

    def _loadComplete(self):
        print "Done"
        link = self.doc.findFirst('a[link-signup]')
        if link:
            print "link found"
        link.evaluateJavaScript('click()')

if __name__ == "__main__":
    app = QApplication(sys.argv)
    view = Grabber()
    gmail = QUrl('https://accounts.google.com')
    view.load(gmail)
    view.show()
    app.exec_()

回答1:

I think the click() failure may have something to do with how the google page uses javascript to transform the original A element after it loads. If you wrap your evaluateJavaScript() call in an alert(), you can see that the click method is null

link.evaluateJavaScript('this.click')

It is not a 100% cross-browser support to be able to call "click" on a link. It would need to be a button.

You have a couple alternatives...

(#1) Just navigate to the href of the link

def _loadComplete(self):
    page = self.page()
    doc = page.currentFrame().documentElement()
    link = doc.findFirst('#link-signup')
    if link and not link.isNull():
        self.load(QUrl.fromEncoded(link.attribute('href').toAscii()))

(#2) Simulate a click on the web view

def _loadComplete(self):
    page = self.page()
    doc = page.currentFrame().documentElement()
    link = doc.findFirst('#link-signup')
    if link and not link.isNull():
        pos = link.geometry().center()
        self._doMouseClick(page, pos)
    else:
        print "Link not found"

@staticmethod
def _doMouseClick(obj, pos):
    # mouse down
    evt = QMouseEvent(QEvent.MouseButtonPress, pos, 
                            Qt.LeftButton, Qt.LeftButton, Qt.NoModifier)
    QApplication.sendEvent(obj, evt)
    # mouse up
    evt = QMouseEvent(QEvent.MouseButtonRelease, pos, 
                            Qt.LeftButton, Qt.LeftButton, Qt.NoModifier)
    QApplication.sendEvent(obj, evt)

(#3) Make the link clickable via javascript

def _loadComplete(self):
    page = self.page()
    doc = page.currentFrame().documentElement()
    link = doc.findFirst('#link-signup')
    if link and not link.isNull():
        link.evaluateJavaScript("""
            var e = document.createEvent('MouseEvents');
            e.initEvent('click', true, true);
            this.dispatchEvent(e);  
        """)

来源：https://stackoverflow.com/questions/13553817/pyqt4-does-not-redirect-me-to-the-next-page

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