请求 html 在 div 而不是整个页面上无限滚动

Question

您好，我正在尝试从以下网页获取所有链接。当我们向下滚动时，此页面会加载新产品，我试图通过滚动到页面底部来获取所有产品的链接。我在 following this post 之后使用 requests_html 的 scrolldown 方法，但是它只获取无需滚动即可看到的产品链接。问题是它正在向下滚动整个页面而不是产品框架。如果您看到下图，则仅当您在产品框架底部滚动时才会加载产品。

我也试过 seleniumwire（检查下面的代码），但它做同样的事情，滚动到没有加载产品的页面底部。我如何只滚动产品 div？

import requests
from bs4 import BeautifulSoup
from selenium import webdriver
import time
from seleniumwire import webdriver

baseurl = "https://www.medplusmart.com/categories/personal-care_10102/skin-care_20002"

header = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) '
                  'Chrome/74.0.3729.169 Safari/537.36 '
}
driver = webdriver.Chrome(executable_path="/src/resources/chromedriver")
driver.implicitly_wait(30)
product_links = []
try:
    SCROLL_PAUSE_TIME = 2

    def interceptor(request):
        del request.headers['Referer']  # Delete the header first
        request.headers['Referer'] = header

    # Set the interceptor on the driver
    driver.request_interceptor = interceptor

    # All requests will now use 'some_referer' for the referer
    driver.get(baseurl)

    last_height = driver.execute_script("return document.body.scrollHeight")
    while True:
        driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
        time.sleep(SCROLL_PAUSE_TIME)
        new_height = driver.execute_script("return document.body.scrollHeight")
        if new_height == last_height:
            break
        last_height = new_height

    # r = requests.get(driver.page_source, headers=header)
    print(driver.page_source)
    soup = BeautifulSoup(driver.page_source, 'html.parser')

    # product_list = soup.find_all('div', class_='col-item productInfoDiv ')
    #
    # for itemprop in product_list:
    #     for link in itemprop.find_all('a', href=True):
    #         product_links.append("{}{}".format(baseurl, link['href']))
    #
    # product_links_uniq = set(product_links)
    #
    # print(product_links_uniq)

finally:
    driver.quit()

from requests_html import HTML, HTMLSession

baseurl = "https://www.medplusmart.com/categories/personal-care_10102/skin-care_20002"

session = HTMLSession()
page = session.get(baseurl)
page.html.render(scrolldown=50, sleep=3)
html = HTML(html=page.text)
#noticeName = html.find('a href')
all_links = html.links
for ln in all_links:
    print(ln)
print(len(all_links))

filtered_links = [link for link in all_links if link.startswith("/product")]
print(len(filtered_links))

Answer 1

您可以只模仿页面所做的 POST 请求，并继续请求 20 个结果的批次，提取链接，直到您收集到指定的结果总数。

import requests
import math
from bs4 import BeautifulSoup as bs


def add_product_links(soup):
    product_links.extend(['https://www.medplusmart.com' + i['href']
                          for i in soup.select('.productInfoDiv > div:nth-child(1) > [href^=\/product]')])
    return


product_links = []
n = 0
results_per_page = 20
page = 1

data = {
    'sortField': '',
    'startIndex': n,
    'productCategoryId': 'MART_20002',
    'startPrice': '',
    'endPrice': '',
    'minPrice': '0',
    'maxPrice': '2650',
    'excludeNoStock': 'N',
    'pCatName': 'personal-care_10102',
    'catName': 'skin-care_20002',
    'productIdString': '',
    'Brand Search': ''
}

with requests.Session() as s:
    s.headers = {"User-Agent": "Safari/537.36"}
    r = s.get(
        'https://www.medplusmart.com/categories/personal-care_10102/skin-care_20002')
    soup = bs(r.content, 'lxml')
    data['productIdString'] = soup.select_one('#productIdString')['value']
    num_results = int(soup.select_one('#totalProductFound')['value'])
    num_pages = math.ceil(num_results / results_per_page)
    add_product_links(soup)
    s.headers.update({'x-kl-ajax-request': 'Ajax_Request'})

    while True:
        if page > num_pages:
            break
        data['startIndex'] = n
        r = s.post('https://www.medplusmart.com/loadMoreProduct.mart', data=data)
        soup = bs(r.content, 'lxml')
        add_product_links(soup)
        n += results_per_page
        page += 1

print(len(product_links))