TL;DR;
Selenium API 有一个“等待...” 功能：
http://selenium-python.readthedocs.io/waits.html
实现一个expected_condition，然后将其与wait结合
element = WebDriverWait(driver, 10)
.until(custom_expected_condition((By.ID, 'search-input'), argA, argB))
等待
值得知道的是，“等待”是同步运行的（阻塞线程），并且可以与以下之一结合使用，开箱即用：
- 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
- 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
如您所见，不存在element_has_style_value 条件，但是始终可以使用自己的实现来扩展“等待”。
在文档中，自定义的预期条件如下所示：
class element_has_css_class(object):
"""An expectation for checking that an element has a particular css class.
locator - used to find the element
returns the WebElement once it has the particular css class
"""
def __init__(self, locator, css_class):
self.locator = locator
self.css_class = css_class
def __call__(self, driver):
element = driver.find_element(*self.locator) # Finding the referenced element
if self.css_class in element.get_attribute("class"):
return element
else:
return False
它的用法是：
# Wait until an element with id='myNewInput' has class 'myCSSClass'
wait = WebDriverWait(driver, 10)
element = wait.until(element_has_css_class((By.ID, 'myNewInput'), "myCSSClass"))
可能的解决方案
将所有内容放在一个资产页面中，如下所示：https://output.jsbin.com/xutipu
可以实现这个：
class element_has_css_value(object):
"""An expectation for checking that an element has a particular css property and value.
locator - used to find the element
returns the WebElement once it has the particular css property and value
"""
def __init__(self, locator, css_property, css_value):
self.locator = locator
self.css_property = css_property
self.css_value = css_value
def matchPropertyAndValue(self, css_property, css_value):
return css_property == self.css_property and css_value == self.css_value;
def extractPropertyAndValue(self, cssStatement):
keyValue = cssStatement.split(':')
if len(keyValue) == 2:
key = keyValue[0].strip();
value = keyValue[1].strip();
return (key, value)
return (None, None)
def findProperty(self, entries):
foundProperty = False
for entry in entries:
(css_property, css_value) = self.extractPropertyAndValue(entry)
if css_value is None:
continue
foundProperty = self.matchPropertyAndValue(css_property, css_value);
if foundProperty :
break;
return foundProperty
def __call__(self, driver):
element = driver.find_element(*self.locator) # Finding the referenced element
styles = element.get_attribute("style")
entries = styles.split(';')
foundProperty = self.findProperty(entries);
if foundProperty :
return element
else:
return False
并像这样使用它：
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
driver = webdriver.Chrome()
driver.get("https://output.jsbin.com/xutipu")
button = None;
try:
button = WebDriverWait(driver, 10).until(
EC.presence_of_element_located((By.ID, "search-button"))
)
except e:
print(e);
driver.quit()
button.send_keys(Keys.RETURN)
try :
wait = WebDriverWait(driver, 10)
element = wait.until(element_has_css_value((By.ID, 'search-input'), "border-color", "rgb(169, 68, 66)"))
assert element;
print('Success');
finally:
driver.quit()