如何使用 scrapy-selenium 加载 more/show 更多分页

Question

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import scrapy
from scrapy.selector import Selector
from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains
from time import sleep

class ProductSpider(scrapy.Spider):

    name = "card"

    allowed_domains = ['moneyfacts.co.uk']

    start_urls = ['https://moneyfacts.co.uk/credit-cards/balance-transfer-credit-cards/?fbclid=IwAR05-Sa1hIcYTRx8DXYYQd0UfDRjWF-jD2-u51jiLP-WKlkxSddKjzUcnWA']

    def __init__(self):
        self.driver = webdriver.Chrome()

    def parse(self, response):
        self.driver.get(response.url)
        actions = ActionChains(self.driver)

        while True:
            next = self.driver.find_elements_by_css_selector("button#show-more")

            if next:
                last_height = self.driver.execute_script("return document.body.scrollHeight")
                self.driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
                actions.move_to_element(next[0]).click().perform()
                
                
                lists= Selector(text=self.driver.page_source)
                
                for list in lists.xpath('//ul[@id="finder-table"]/li'):
                    yield{
                        'Name': list.xpath('.//*[@class="table-item-heading-product-name"]/span/strong/text()').get(),
                        'Title': list.xpath('.//*[@class="table-item-heading-product-name"]/span/text()').get()
                    }

            else:
                break

        self.driver.close()

Answer 1

我想您需要滚动到“显示更多”按钮才能单击它，因为在您向下滚动屏幕之前它不在屏幕的可视区域中。
此外，最好根据 class 名称而不是文本来定位元素。
此外，如果没有更多的“显示更多”按钮，您的代码将抛出异常。所以我用 find_elements 而不是你写的来获取元素列表。这不会抛出异常。如果没有找到任何元素，它将 return 一个空列表，您的代码将正常退出。如果找到元素，您将使用 returned 列表中的第一个元素。
这就是我最终重新构建您的代码的结果：


import scrapy

from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains
from time import sleep

class ProductSpider(scrapy.Spider):

    name = "card"

    allowed_domains = ['moneyfacts.co.uk']

    start_urls = ['https://moneyfacts.co.uk/credit-cards/balance-transfer-credit-cards/?fbclid=IwAR05-Sa1hIcYTRx8DXYYQd0UfDRjWF-jD2-u51jiLP-WKlkxSddKjzUcnWA']

    def __init__(self):
        self.driver = webdriver.Chrome()

    def parse(self, response):
        self.driver.get(response.url)
        actions = ActionChains(self.driver)

        while True:
            next =  driver.find_elements_by_css_selector("button#show-more")

            if next:
                last_height = driver.execute_script("return document.body.scrollHeight")
                driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
                actions.move_to_element(next[0]).click().perform()

                lists = self.driver.find_elements_by_xpath(
                    '//ul[@id="finder-table"]/li')
                for list in lists:
                    yield{
                        'Name': list.xpath('.//*[@class="table-item-heading-product-name"]/span/strong/text()').get(),
                        'Title': list.xpath('.//*[@class="table-item-heading-product-name"]/span/text()').get()
                    }

            else:
                break

        self.driver.close()

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