Ytukyg

I want to get the result of the web page http://www3.hkexnews.hk/listedco/listconews/advancedsearch/search_active_main.aspx with the input of stock code being 5.

The problem is that I don't know the website after pressing search as it runs a javascript.

Furthermore, how to find the parameters needed to pass to requests.post, e.g. data? Is header needed?

You have multiple options:

1) You can use Selenium. First install Selenium.

sudo pip3 install selenium

Then get a driver https://sites.google.com/a/chromium.org/chromedriver/downloads (Depending upon your OS you may need to specify the location of your driver)

from selenium import webdriver

from bs4 import BeautifulSoup

import time



browser = webdriver.Chrome()

url = "http://www3.hkexnews.hk/listedco/listconews/advancedsearch/search_active_main.aspx"

browser.get(url)

element = browser.find_element_by_id('ctl00_txt_stock_code')  # find the text box

time.sleep(2)

element.send_keys('5')  # populate the text box

time.sleep(2)

element.submit()  # submit the form

soup = BeautifulSoup(browser.page_source, 'html.parser')

browser.quit()

for news in soup.find_all(class_='news'):

    print(news.text)

2) Or use PyQt with QWebEngineView.

Install PyQt on Ubuntu:

    sudo apt-get install python3-pyqt5

    sudo apt-get install python3-pyqt5.qtwebengine

or on other OS (64 bit versions of Python)

    pip3 install PyQt5

Basically you load the first page with the form on. Fill in the form by running JavaScript then submit it. The loadFinished() signal is called twice, the second time because you submitted the form so you can use an if statement to differentiate between the calls.

import sys

from PyQt5.QtWidgets import QApplication

from PyQt5.QtCore import QUrl

from PyQt5.QtWebEngineWidgets import QWebEngineView

from bs4 import BeautifulSoup





class Render(QWebEngineView):

    def __init__(self, url):

        self.html = None

        self.first_pass = True

        self.app = QApplication(sys.argv)

        QWebEngineView.__init__(self)

        self.loadFinished.connect(self._load_finished)

        self.load(QUrl(url))

        self.app.exec_()



    def _load_finished(self, result):

        if self.first_pass:

            self._first_finished()

            self.first_pass = False

        else:

            self._second_finished()



    def _first_finished(self):

        self.page().runJavaScript("document.getElementById('ctl00_txt_stock_code').value = '5';")

        self.page().runJavaScript("document.getElementById('ctl00_sel_DateOfReleaseFrom_y').value='1999';")

        self.page().runJavaScript("preprocessMainForm();")

        self.page().runJavaScript("document.forms[0].submit();")



    def _second_finished(self):

        self.page().toHtml(self.callable)



    def callable(self, data):

        self.html = data

        self.app.quit()



url = "http://www3.hkexnews.hk/listedco/listconews/advancedsearch/search_active_main.aspx"

web = Render(url)

soup = BeautifulSoup(web.html, 'html.parser')

for news in soup.find_all(class_ = 'news'):

    print(news.text)

Outputs:

Voting Rights and Capital

Next Day Disclosure Return

NOTICE OF REDEMPTION AND CANCELLATION OF LISTING

THIRD INTERIM DIVIDEND FOR 2018

Notification of Transactions by Persons Discharging Managerial Responsibilities

Next Day Disclosure Return

THIRD INTERIM DIVIDEND FOR 2018

Monthly Return of Equity Issuer on Movements in Securities for the month ended 31 October 2018

Voting Rights and Capital

PUBLICATION OF BASE PROSPECTUS SUPPLEMENT

3Q 2018 EARNINGS RELEASE AUDIO WEBCAST AND CONFERENCE CALL

3Q EARNINGS RELEASE - HIGHLIGHTS

Scrip Dividend Circular

2018 Third Interim Dividend; Scrip Dividend

THIRD INTERIM DIVIDEND FOR 2018 SCRIP DIVIDEND ALTERNATIVE

NOTIFICATION OF MAJOR HOLDINGS

EARNINGS RELEASE FOR THIRD QUARTER 2018

NOTIFICATION OF MAJOR HOLDINGS

Monthly Return of Equity Issuer on Movements in Securities for the month ended 30 September 2018

THIRD INTERIM DIVIDEND FOR 2018; DIVIDEND ON PREFERENCE SHARES

Alternatively you can use Scrapy splash https://github.com/scrapy-plugins/scrapy-splash

Or Requests-HTML https://html.python-requests.org/ .

But I am not sure how you would fill the form in using these two last approaches.