实例：百度搜索，结果列表翻页查询
解决问题：解决selenium driver获取web页面元素时,元素过期问题
思路1：获取所有“页面翻页链接”元素，然后遍历元素并点击
# -*- coding: utf-8 -*- from selenium import webdriver import time if __name__ == "__main__": driver = webdriver.Firefox() driver.maximize_window() driver.get('http://www.baidu.com') driver.implicitly_wait(5) driver.find_element_by_id('kw1').send_keys('selenium') driver.find_element_by_id('su1').click() page = driver.find_element_by_id('page') pages = page.find_elements_by_tag_name('a') #查找所有翻页跳转链接 #设置滚动条位置为底部 js = 'document.documentElement.scrollTop=10000' for each in pages: driver.execute_script(js) #拖动滚动条到底部 each.click() driver.execute_script(js) time.sleep(3) driver.quit() |
结果：点击第3页时，程序出错
selenium.common.exceptions.StaleElementReferenceException: Message: u'Element not found in the cache - perhaps the page has changed since it was looked up' ; Stacktrace:
即在cache中找不到元素，可能是在元素被找到之后页面变换了。 这就说明，当前页面发生跳转之后，存在cache中的与这个页面相关的元素也被清空了
思路2：基于思路1的错误结果分析>先获取每个页面数，然后每次点击某个页面，跳转后重新获取下一个页面翻页链接，然后点击，循环。。
# -*- coding: utf-8 -*- from selenium import webdriver import time if __name__ == "__main__": driver = webdriver.Firefox() driver.maximize_window() driver.get('http://www.baidu.com') driver.implicitly_wait(5) driver.find_element_by_id('kw1').send_keys('selenium') driver.find_element_by_id('su1').click() page = driver.find_element_by_id('page') pages = page.find_elements_by_tag_name('a') js = 'document.documentElement.scrollTop=10000' total = len(pages) has_pre_page = False page_num = 0 for i in range(total): driver.execute_script(js) pn=10 page_num = page_num + 1 #设置页面号 one_page = driver.find_element_by_css_selector('p[id="page"]>a:nth-of-type('+str(page_num)+')') one_page.click() |
