webdriver(处理select下拉框元素)

 """处理下拉框"""

 from selenium import webdriver

 from selenium.webdriver.common.by import By

 from selenium.webdriver.support.ui import WebDriverWait

 from selenium.webdriver.support import expected_conditions as ES

 from selenium.webdriver.common.action_chains import ActionChains

 from selenium.webdriver.support.select import Select

 import time

 def elementFind(driver, way, str):

     """

     封装具有等待时间加判断的定位方法

     :param driver:

     :param way: 定位方式

     :param str: 要定位的元素

     :return:

     """

     try:

         element = WebDriverWait(driver, 5, 0.5).until(ES.presence_of_element_located((way, str)))

         return element

     except:

         return False

 driver = webdriver.Chrome()

 driver.get("http://www.baidu.com")

 el = elementFind(driver, By.LINK_TEXT, '设置')

 ActionChains(driver).move_to_element(el).perform()

 time.sleep(1)

 driver.find_element(By.CSS_SELECTOR, '.setpref').click()

 """

 1 select_by_index          # 通过索引定位

 2 select_by_value          # 通过value值定位

 3 select_by_visible_text   # 通过文本值定位

 """

 time.sleep(1)

 s = driver.find_element_by_css_selector("#nr")

 Select(s).select_by_value('')

 # 二次定位方式

 time.sleep(1)

 driver.find_element_by_id("nr").find_element_by_xpath("//option[@value='20']").click()

 time.sleep(3)

 driver.quit()