python - headless webdriver 返回错误但非 headless 工作

Question

我正在使用 Amazon 和 Webdriver 做一个简单的实验。但是，使用 Webdriver Headless 无法找到元素和错误，但 non-headless 可以。

关于如何让它 headless 工作的任何建议？ 在 --headless 标志的正上方有一条评论。

from selenium import webdriver
import sys
import os

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC


def get_inventory(url):

    chrome_options = Options()

    # Making it headless breaks. Commenting
    # this line, making it non-headless works.  
    chrome_options.add_argument("--headless")

    chrome_options.add_experimental_option(
        "prefs", {'profile.managed_default_content_settings.javascript': 2})
    chrome_options.binary_location = '/Applications/Google Chrome Canary.app/Contents/MacOS/Google Chrome Canary'

    driver = webdriver.Chrome(executable_path=os.path.abspath(
        'chromedriver'), chrome_options=chrome_options)

    driver.set_window_size(1200, 1000)

    try:
        driver.get(url)

        add_to_cart_button_xp = '//*[@id="add-to-cart-button"]'
        add_to_cart_button = driver.find_element_by_xpath(add_to_cart_button_xp)
        add_to_cart_button.click()

        driver.get('https://www.amazon.com/gp/cart/view.html/ref=lh_cart')

        qty_field_xp = '//div/input[starts-with(@name, "quantity.") and @type="text"]'
        qty_field = driver.find_element_by_xpath(qty_field_xp)
        qty_field.clear()
        qty_field.send_keys("2")

        update_link_xp = f'//input[@value="Update" and @type="submit"]'
        update_link = driver.find_element_by_xpath(update_link_xp)
        update_link.click()



url = 'https://www.amazon.com/Pexio-Professional-Stainless-Food-Safe-Dishwasher/dp/B07BGBSY9F'
get_inventory(url)

Answer 1

我认为您只是遇到了一些选择器问题。我检查了元素并更新了数量设置；除了二进制位置之外，其他一切都应该几乎相同。

from selenium import webdriver
import sys
import os

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC


def get_inventory(url):
    chrome_options = Options()

    chrome_options.add_argument("--headless")

    driver = webdriver.Chrome(
        executable_path='/usr/bin/chromedriver', 
        chrome_options=chrome_options,
    )
    chrome_options.add_experimental_option(
        "prefs", 
        {'profile.managed_default_content_settings.javascript': 2},
    )
    chrome_options.binary_location = '/usr/bin'

    driver.set_window_size(1200, 1000)

    try:
        driver.get(url)
        driver.save_screenshot("/tmp/x1.png")

        driver.find_element_by_xpath('//*[@id="add-to-cart-button"]').click()

        driver.get('https://www.amazon.com/gp/cart/view.html/ref=lh_cart')

        driver.find_element_by_xpath("//span[@data-action='a-dropdown-button']").click()
        driver.find_element_by_xpath("//*[@class='a-dropdown-link'][text()[contains(., '2')]]").click()

        driver.find_element_by_class_name("nav-logo-base").click()

        driver.save_screenshot("/tmp/confirm.png")
        driver.close()
    except Exception as e:
        print(e)


url = 'https://www.amazon.com/Pexio-Professional-Stainless-Food-Safe-Dishwasher/dp/B07BGBSY9F'
get_inventory(url)

我已经在使用和不使用 --headless 的情况下运行了它，它对我来说工作正常。最后我导航到主页，这样您就可以确认数量更改是否有效(因此是屏幕截图)。