Selenium等待javascript超时

Question

我想做的是抓取以下站点https://wiki.openstreetmap.org/wiki/Key:office，特别是包含所有标签的表，因此包含在:

<table class="wikitable taginfo-taglist">...<table>

<div class="taglist" ...> ... <div>

(表的父)是由JavaScript生成的，我认为这段代码可以工作:

from bs4 import BeautifulSoup
from selenium import webdriver
from selenium.webdriver.firefox.options import Options
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By

options = Options()
options.add_argument("--headless")
caps = webdriver.DesiredCapabilities().FIREFOX
caps["marionette"] = True
driver = webdriver.Firefox(options=options, capabilities=caps, executable_path='../statics/geckodriver')


def get_tag_soup(url):
driver.get(url)
try:
table = WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.CLASS_NAME , "wikitable taginfo-taglist")))
soup = BeautifulSoup(table.get_attribute('innerHTML'), 'lxml') 
except Exception as e:
soup = e

return soup 
get_tag_soup('https://wiki.openstreetmap.org/wiki/Key:office')

但是当我运行这段代码时，我只是得到一个selenium.common.exceptions.TimeoutException('', None, None)，更令人沮丧的是，如果我用EC.presence_of_element_located((By.CLASS_NAME , "taglist"))为"wikitable taginfo-taglist"的父WebDriverWait，它可以工作。

Answer 1

要提取包含所有标签的表而不是presence_of_element_located()，您必须诱导WebDriverWait等待visbility_of_element_located()，您可以使用以下定位器策略:

• UsingCSS_SELECTOR:

  driver.get("https://wiki.openstreetmap.org/wiki/Key:office")
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "table.wikitable.taginfo-taglist"))).text)
  

• UsingXPATH:

  driver.get("https://wiki.openstreetmap.org/wiki/Key:office")
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//table[@class='wikitable taginfo-taglist']"))).text)
  

控制台输出

• :

  Key Value Element Description Map rendering Image Count
  office accountant An office for an accountant.
  6 895
  1 967
  14
  office advertising_agency A service-based business dedicated to creating, planning, and handling advertising.
  3 916
  580
  3
  office architect An office for an architect or group of architects.
  5 715
  1 239
  12
  office association An office of a non-profit organisation, society, e.g. student, sport, consumer, automobile, bike association, etc.
  13 054
  3 286
  50
  office charity An office of a charitable organization
  696
  384
  7
  office company An office of a private company
  129 801
  36 951
  608
  office consulting An office for a consulting firm, providing expert professional advice to other companies or organisations.
  1 341
  162
  4
  office coworking An office where people can go to work (might require a fee); not limited to a single employer
  1 297
  320
  7
  office diplomatic
  6 634
  4 065
  95
  office educational_institution An office for an educational institution.
  14 172
  8 563
  175
  office employment_agency An office for an employment service.
  7 300
  1 771
  43
  office energy_supplier An office for a energy supplier.
  2 237
  1 112
  19
  office engineer An office for an engineer or group of engineers.
  454
  98
  2
  office estate_agent A place where you can rent or buy a house.
  44 813
  8 042
  39
  office financial An office of a company in the financial sector
  4 891
  1 588
  24
  office forestry A forestry office
  523
  741
  9
  office foundation An office of a foundation
  1 757
  542
  10
  office government An office of a (supra)national, regional or local government agency or department
  98 289
  70 569
  2 300
  office guide An office for tour guides, mountain guides, dive guides, etc.
  587
  168
  1
  office insurance An office at which you can take out insurance policies.
  34 693
  6 475
  91
  office it An office for an IT specialist.
  9 486
  2 039
  51
  office lawyer An office for a lawyer.
  22 881
  4 841
  22
  office logistics An office for a forwarder / hauler.
  2 796
  677
  8
  office moving_company An office which offers a relocation service.
  605
  252
  4
  office newspaper An office of a newspaper
  3 511
  1 450
  27
  office ngo An office for a non-profit, non-governmental organisation (NGO).
  12 693
  3 565
  58
  office notary An office for a notary public (common law)
  3 860
  548
  9
  office political_party An office of a political party
  3 354
  1 017
  8
  office property_management Office of a company, which manages a real estate property.
  796
  162
  2
  office quango An office of a quasi-autonomous non-governmental organisation.
  366
  233
  4
  office religion office of a community of faith
  5 807
  2 172
  43
  office research An office for research and development
  3 667
  4 545
  348
  office surveyor An office of a person doing surveys, this can be risk and damage evaluations of properties and equipment, opinion surveys or statistics.
  451
  109
  1
  office tax_advisor An office for a financial expert specially trained in tax law
  5 053
  823
  4
  office telecommunication An office for a telecommunication company
  16 968
  4 335
  77
  office visa An office of an organisation or business which offers visa assistance
  95
  1
  0
  office water_utility The office for a water utility company or water board.
  743
  908
  20
  office yes Generic tag for unspecified office type.
  27 434
  36 155
  420
  

注意:请确保您已最大化浏览器Viewport，如下所示:

options.add_argument("start-maximized")