QWebKit - Run page's javascript function?

Question

Basically I want to go into my Router's settings,
set a checkbutton and than call a function on the page,
all programmatically.

I know all the javascript to do this,
and can do it via the Google Chrome console.

I can syntactically perform it through QWebKit,
but the actual page remains unaffected.

import sys
from PyQt4 import QtCore, QtGui, QtWebKit

class Browser(QtWebKit.QWebView):
    def __init__(self, parent = None):
        super(Browser, self).__init__()
        self.changepage()

    def changepage(self):
        self.load(QtCore.QUrl("http://192.168.0.1/adv_mac_filter.php"))
        x1 = self.page().mainFrame()
        x1.evaluateJavaScript("entry_enable_1.checked = true;")
        x1.evaluateJavaScript("check();")


app = QtGui.QApplication(sys.argv)
x = Browser()
x.show()
sys.exit(app.exec_())

(Yes, this code requires that I am already logged into my routers settings)
I know the JavaScript is being run, as I can test it using Alerts.

However, the routers' html "checked()" function or checkbox aren't ran / changed.
It's like I'm not actually interacting with the page, but a copy.

Am I making a massive rookie mistake here?

---

Specs:
python 2.7
PyQt4
QWebKit
Windows 7

Answer 1

You should probably wait for the page to finish loading, by moving the javascript evaluation to a slot connected to the loadFinished() signal.

But as Pointy suggested, you could also try to send POST requests yourself, through QNetworkAccessManager, instead of using a widget.