Selenium快速入门（下）

Frame相关

import time
from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException

browser = webdriver.Firefox()
url = \'http://www.runoob.com/try/try.php?filename=jqueryui-api-droppable\'
browser.get(url)
browser.switch_to.frame(\'iframeResult\')

source = browser.find_element_by_css_selector(\'#draggable\')
print(source)

# 在frame里面找不到外面的元素
try:
    logo = browser.find_element_by_class_name(\'logo\')
except NoSuchElementException:
    print(\'NO LOGO\')

# 切换回父级frame
browser.switch_to.parent_frame()
logo = browser.find_element_by_class_name(\'logo\')
print(logo)
print(logo.text)

等待

• 隐式等待

from selenium import webdriver

browser = webdriver.Firefox()
browser.implicitly_wait(10)      # 设置隐式等待超时时间
browser.get(\'https://www.zhihu.com/explore\')

input = browser.find_element_by_class_name(\'zu-top-add-question\')
print(input)
browser.close()

• 显示等待

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 EC

browser = webdriver.Firefox()
browser.get(\'https://www.taobao.com\')
wait = WebDriverWait(browser,10)
input = wait.until(EC.presence_of_element_located((By.ID, \'q\')))
button = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, \'.btn-search\')))
print(input, button)

显示等待常用的方法

title_is     # 标题是某个内容
title_contains # 标题中包含什么内容
presence_of_element_located    # 元素加载出， 传入定位元组，如(By.ID, \'p;)
visibility_of_element_located  # 元素可见，传入定位元组
visibility_of  # 可见，传入元素对象
presence_of_all_elements_located    # 所有的元素加载出
text_to_be_present_in_element    #某个元素文本包含某个文字
text_to_be_present_in_element_value   #某个元素包含某个文字
frame_to_be_available_and_switch_to_it    # frame加载并切换过去
invisibility_of_element_loacted     # 元素不可见
element_to_be_clickable       # 元素可点击
staleness_of    # 判断某个元素是都仍在DOM，可判断出页面是否刷新
element_to_be_selected    #元素可选择，传入元素对象
element_located_to_be_selected   # 元素可选择，传定位元组
element_selection_state_to_be    # 传入元素对象及其状态，相等返回True，否则返回False
element_located_selection_state_to_be   # 传入定位元组以及状态，相等返回True，否则返回False
alert_is_present      # 是否出现Alert

页面的前进和后退

import time
from selenium import webdriver

browser  = webdriver.Firefox()
browser.get(\'https://www.baidu.com/\')
browser.get(\'https://www.taobao.com/\')
browser.get(\'https://www.jd.com/\')

browser.back()
time.sleep(1)
browser.forward()
browser.close()

cookies设置

from selenium import webdriver

browser  = webdriver.Firefox()
browser.get(\'https://www.zhihu.com\')   # 以列表的形式返回
print(browser.get_cookies())
# 以追加的形式添加cookie
browser.add_cookie({\'name\':\'name\',
                    \'domain\':\'www.zhihu.com\',
                    \'value\':\'germy\'
                    })

print(browser.get_cookies())
browser.delete_all_cookies()
print(browser.get_cookies())

选项卡设置

import time
from selenium import webdriver

browser = webdriver.Firefox()
browser.get(\'https://www.baidu.com\')
browser.execute_script(\'window.open()\')
print(browser.window_handles)

# 窗口的切换从0开始

browser.switch_to_window(browser.window_handles[1])
browser.get(\'https://www.taobao.com\')
time.sleep(1)
browser.switch_to_window(browser.window_handles[0])
browser.get(\'https://www.jd.com\')

异常处理

不使用异常处理

from selenium import webdriver

browser = webdriver.Firefox()

browser.get(\'http://www.baidu.com\')
browser.find_element_by_id(\'hello\')  # 报错 selenium.common.exceptions.NoSuchElementException

使用异常处理

from  selenium import webdriver
from selenium.common.exceptions import TimeoutException,NoSuchElementException

browser = webdriver.Firefox()
try:
    browser.get(\'https://www.baidu.com\')
except TimeoutException:
    print(\'Time out\')
try:
    browser.find_element_by_id(\'hello\')
except NoSuchElementException:
    print(\'No Elemment\')
finally:
    browser.close()