selenium之百度搜索，结果列表翻页查询

by:授客 QQ：1033553122

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()

#备注以下小段代码描述了页面变化规律，这个得自己去研究

if not has_pre_page:   #点击第2页时会出现上一页，页号加1

has_pre_page = True

page_num = page_num + 1

if page_num % 7 == 0: #page_num等于7时，页号减1

page_num = page_num - 1

time.sleep(2)

driver.execute_script(js)

time.sleep(2)

time.sleep(3)

driver.quit()

改进版(自动翻页，前翻页后翻页)

# -*-
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
selenium')#测试数据
selenium
zhidashso dld#selenium zhidashso dldld

driver.find_element_by_id('su1').click()

js = 'document.documentElement.scrollTop=10000'

total = 0
 #页面数

is_next_page = True  #存在下一页

page_num = 0   #要点击的页面号

#往后翻页

while
is_next_page:#'sv_page\=1' in
one_page.get_attribute('href')

driver.execute_script(js)

page_num = page_num + 1  
 #设置页号为下一页

total = page_num  
#记录页面数

value=str(page_num)

try:

#查找指定页面

one_page =
driver.find_element_by_css_selector('p[id="page"]>a[href*=pn\='+value+']')

one_page.click()

time.sleep(1)

driver.execute_script(js)

time.sleep(1)

except:

print('no
next page')

is_next_page = False

total = total - 1

break

#往前翻页

while
total >=
0:

driver.execute_script(js)

try:

total = total -1

value = str(total)

one_page =
driver.find_element_by_css_selector('p[id="page"]>a[href*=pn\='+value+']')

one_page.click()

time.sleep(1)

driver.execute_script(js)

time.sleep(1)

except:

print('no
pre page')

break;

time.sleep(3)

driver.quit()