如何在python中使用selenium webdriver滚动动态网页的特定部分？

Question

我找到了许多滚动整个网页的引用，但我正在寻找一个特定的部分来滚动。我正在marketwatch.com上工作 - 部分 - 最新新闻标签。如何使用selenium webdriver滚动这个最新的新闻标签？

下面是我的代码，它返回新闻的标题，但不断重复相同的标题。

from bs4 import BeautifulSoup
import urllib
import csv
import time
from selenium import webdriver


count = 0   
browser = webdriver.Chrome()
browser.get("https://www.marketwatch.com/newsviewer")

pageSource = browser.page_source

soup = BeautifulSoup(pageSource, 'lxml')

arkodiv = soup.find("ol", class_="viewport")

while browser.find_element_by_tag_name('ol'):
    browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    time.sleep(0.5)
    div = list(arkodiv.find_all('div', class_= "nv-details"))

    heading = []
    Data_11 = list(soup.find_all("div", class_ = "nv-text-cont"))          

    datetime = list(arkodiv.find_all("li", timestamp = True))
    for sa in datetime:
        sh = sa.find("div", class_ = "nv-text-cont")
        if sh.find("a", class_ = True):
            di = sh.text.strip()
            di = di.encode('ascii', 'ignore').decode('ascii')
        else:
            continue
        print di
        heading.append((di))       
        count = count+1         


    if 'End of Results' in arkodiv:
        print 'end'
        break
    else:
        continue
    print count

Answer 1

这是因为您正在执行的脚本滚动到页面底部。

要继续滚动元素获取新闻，您需要替换它：

browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")

用这个：

browser.execute_script("document.documentElement.getElementsByClassName('viewport')[0].scrollTop = 999999")

修改

这是完整的解决方案：

from bs4 import BeautifulSoup
import urllib
import csv
import time
from selenium import webdriver


count = 0   
browser = webdriver.Chrome()
browser.get("https://www.marketwatch.com/newsviewer")

while browser.find_element_by_tag_name('ol'):

    pageSource = browser.page_source
    soup = BeautifulSoup(pageSource, 'lxml')
    arkodiv = soup.find("ol", class_="viewport")
    browser.execute_script("document.documentElement.getElementsByClassName('viewport')[0].scrollTop = 999999")
    time.sleep(0.5)
    div = list(arkodiv.find_all('div', class_= "nv-details"))

    heading = set()
    Data_11 = list(soup.find_all("div", class_ = "nv-text-cont"))          

    datetime = list(arkodiv.find_all("li", timestamp = True))
    for sa in datetime:
        sh = sa.find("div", class_ = "nv-text-cont")
        if sh.find("a", class_ = True):
            di = sh.text.strip()
            di = di.encode('ascii', 'ignore').decode('ascii')
        else:
            continue
        print di
        heading.add((di))       
        count = count+1         


    if 'End of Results' in arkodiv:
        print 'end'
        break
    else:
        continue
    print count

编辑2

您可能还想更改标题的存储方式，因为您当前的方式会在列表中保留重复项。将其更改为set，以免发生。