【转】selenium webdriver三种等待方法

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原文：https://www.cnblogs.com/lgh344902118/p/6015593.html

webdriver三种等待方法

1.使用WebDriverWait

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait # available since 2.4.0
from selenium.webdriver.support import expected_conditions as EC # available since 2.26.0
driver = webdriver.Firefox()
driver.get("http://somedomain/url_that_delays_loading")
try:
element = WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, "myDynamicElement")))
finally:
driver.quit()

presence_of_element_located可以替换为

title_is
title_contains
presence_of_element_located
visibility_of_element_located
visibility_of
presence_of_all_elements_located
text_to_be_present_in_element
text_to_be_present_in_element_value
frame_to_be_available_and_switch_to_it
invisibility_of_element_located
element_to_be_clickable - it is Displayed and Enabled.
staleness_of
element_to_be_selected
element_located_to_be_selected
element_selection_state_to_be
element_located_selection_state_to_be
alert_is_present

By.ID中的ID可替换为'CLASS_NAME', 'CSS_SELECTOR', 'ID', 'LINK_TEXT', 'NAME', 'PARTIAL_LINK_TEXT', 'TAG_NAME', 'XPATH'

2、隐式等待，相当于设置全局的等待，在定位元素时，对所有元素设置超时时间。

隐式等待使得WebDriver在查找一个Element或者Element数组时，每隔一段特定的时间就会轮询一次DOM，如果Element或数组没有马上被发现的话。

默认设置是0。

一旦设置，这个隐式等待会在WebDriver对象实例的整个生命周期起作用。

from selenium import webdriver
driver = webdriver.Firefox()
driver.implicitly_wait(10) # seconds
driver.get(http://www.xxx.com)
myDynamicElement = driver.find_element_by_id("ElementID")

3、强制等待

import timetime.sleep(10)