基本判断函数
title_is： 判断当前页面的title是否完全等于（==）预期字符串，返回布尔值
title_contains : 判断当前页面的title是否包含预期字符串，返回布尔值
presence_of_element_located : 判断某个元素是否被加到了dom树里，并不代表该元素一定可见
visibility_of_element_located : 判断某个元素是否可见. 可见代表元素非隐藏，并且元素的宽和高都不等于0
visibility_of : 跟上面的方法做一样的事情，只是上面的方法要传入locator，这个方法直接传定位到的element就好了
presence_of_all_elements_located : 判断是否至少有1个元素存在于dom树中。举个例子，如果页面上有n个元素的class都是'column-md-3'，那么只要有1个元素存在，这个方法就返回True
text_to_be_present_in_element : 判断某个元素中的text是否 包含 了预期的字符串
text_to_be_present_in_element_value : 判断某个元素中的value属性是否 包含 了预期的字符串
frame_to_be_available_and_switch_to_it : 判断该frame是否可以switch进去，如果可以的话，返回True并且switch进去，否则返回False
invisibility_of_element_located : 判断某个元素中是否不存在于dom树或不可见
element_to_be_clickable : 判断某个元素中是否可见并且是enable的，这样的话才叫clickable
staleness_of : 等某个元素从dom树中移除，注意，这个方法也是返回True或False
element_to_be_selected : 判断某个元素是否被选中了,一般用在下拉列表
element_selection_state_to_be : 判断某个元素的选中状态是否符合预期
element_located_selection_state_to_be : 跟上面的方法作用一样，只是上面的方法传入定位到的element，而这个方法传入locator
alert_is_present : 判断页面上是否存在alert
使用示例
driver.implicitly_wait(5)
'''隐式等待和显示等待都存在时，超时时间取二者中较大的'''
locator = (By.ID,'kw')
driver.get(base_url)
WebDriverWait(driver,10).until(EC.title_is(u"百度一下，你就知道"))
'''判断title,返回布尔值'''
WebDriverWait(driver,10).until(EC.title_contains(u"百度一下"))
'''判断title，返回布尔值'''
WebDriverWait(driver,10).until(EC.presence_of_element_located((By.ID,'kw')))
'''判断某个元素是否被加到了dom树里，并不代表该元素一定可见，如果定位到就返回WebElement'''
WebDriverWait(driver,10).until(EC.visibility_of_element_located((By.ID,'su')))
'''判断某个元素是否被添加到了dom里并且可见，可见代表元素可显示且宽和高都大于0'''
WebDriverWait(driver,10).until(EC.visibility_of(driver.find_element(by=By.ID,value='kw')))
'''判断元素是否可见，如果可见就返回这个元素'''
WebDriverWait(driver,10).until(EC.presence_of_all_elements_located((By.CSS_SELECTOR,'.mnav')))
'''判断是否至少有1个元素存在于dom树中，如果定位到就返回列表'''
WebDriverWait(driver,10).until(EC.visibility_of_any_elements_located((By.CSS_SELECTOR,'.mnav')))
'''判断是否至少有一个元素在页面中可见，如果定位到就返回列表'''
WebDriverWait(driver,10).until(EC.text_to_be_present_in_element((By.XPATH,"//*[@id='u1']/a[8]"),u'设置'))
'''判断指定的元素中是否包含了预期的字符串，返回布尔值'''
WebDriverWait(driver,10).until(EC.text_to_be_present_in_element_value((By.CSS_SELECTOR,'#su'),u'百度一下'))
'''判断指定元素的属性值中是否包含了预期的字符串，返回布尔值'''
#WebDriverWait(driver,10).until(EC.frame_to_be_available_and_switch_to_it(locator))
'''判断该frame是否可以switch进去，如果可以的话，返回True并且switch进去，否则返回False'''
#注意这里并没有一个frame可以切换进去
WebDriverWait(driver,10).until(EC.invisibility_of_element_located((By.CSS_SELECTOR,'#swfEveryCookieWrap')))
'''判断某个元素在是否存在于dom或不可见,如果可见返回False,不可见返回这个元素'''
#注意#swfEveryCookieWrap在此页面中是一个隐藏的元素
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//*[@id='u1']/a[8]"))).click()
'''判断某个元素中是否可见并且是enable的，代表可点击'''
driver.find_element_by_xpath("//*[@id='wrapper']/div[6]/a[1]").click()
#WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//*[@id='wrapper']/div[6]/a[1]"))).click()
#WebDriverWait(driver,10).until(EC.staleness_of(driver.find_element(By.ID,'su')))
'''等待某个元素从dom树中移除'''
#这里没有找到合适的例子
WebDriverWait(driver,10).until(EC.element_to_be_selected(driver.find_element(By.XPATH,"//*[@id='nr']/option[1]")))
'''判断某个元素是否被选中了,一般用在下拉列表'''
WebDriverWait(driver,10).until(EC.element_selection_state_to_be(driver.find_element(By.XPATH,"//*[@id='nr']/option[1]"),True))
'''判断某个元素的选中状态是否符合预期'''
WebDriverWait(driver,10).until(EC.element_located_selection_state_to_be((By.XPATH,"//*[@id='nr']/option[1]"),True))
'''判断某个元素的选中状态是否符合预期'''
driver.find_element_by_xpath(".//*[@id='gxszButton']/a[1]").click()
instance = WebDriverWait(driver,10).until(EC.alert_is_present())
'''判断页面上是否存在alert,如果有就切换到alert并返回alert的内容'''
print(instance.text)
instance.accept()
源码
class title_is(object):
"""An expectation for checking the title of a page.
title is the expected title, which must be an exact match
returns True if the title matches, false otherwise."""
def __init__(self, title):
self.title = title
def __call__(self, driver):
return self.title == driver.title
class title_contains(object):
""" An expectation for checking that the title contains a case-sensitive
substring. title is the fragment of title expected
returns True when the title matches, False otherwise
"""
def __init__(self, title):
self.title = title
def __call__(self, driver):
return self.title in driver.title
class presence_of_element_located(object):
""" An expectation for checking that an element is present on the DOM
of a page. This does not necessarily mean that the element is visible.
locator - used to find the element
returns the WebElement once it is located
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
return _find_element(driver, self.locator)
class visibility_of_element_located(object):
""" An expectation for checking that an element is present on the DOM of a
page and visible. Visibility means that the element is not only displayed
but also has a height and width that is greater than 0.
locator - used to find the element
returns the WebElement once it is located and visible
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
try:
return _element_if_visible(_find_element(driver, self.locator))
except StaleElementReferenceException:
return False
class visibility_of(object):
""" An expectation for checking that an element, known to be present on the
DOM of a page, is visible. Visibility means that the element is not only
displayed but also has a height and width that is greater than 0.
element is the WebElement
returns the (same) WebElement once it is visible
"""
def __init__(self, element):
self.element = element
def __call__(self, ignored):
return _element_if_visible(self.element)
def _element_if_visible(element, visibility=True):
return element if element.is_displayed() == visibility else False
class presence_of_all_elements_located(object):
""" An expectation for checking that there is at least one element present
on a web page.
locator is used to find the element
returns the list of WebElements once they are located
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
return _find_elements(driver, self.locator)
class visibility_of_any_elements_located(object):
""" An expectation for checking that there is at least one element visible
on a web page.
locator is used to find the element
returns the list of WebElements once they are located
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
return [element for element in _find_elements(driver, self.locator) if _element_if_visible(element)]
class text_to_be_present_in_element(object):
""" An expectation for checking if the given text is present in the
specified element.
locator, text
"""
def __init__(self, locator, text_):
self.locator = locator
self.text = text_
def __call__(self, driver):
try:
element_text = _find_element(driver, self.locator).text
return self.text in element_text
except StaleElementReferenceException:
return False
class text_to_be_present_in_element_value(object):
"""
An expectation for checking if the given text is present in the element's
locator, text
"""
def __init__(self, locator, text_):
self.locator = locator
self.text = text_
def __call__(self, driver):
try:
element_text = _find_element(driver,
self.locator).get_attribute("value")
if element_text:
return self.text in element_text
else:
return False
except StaleElementReferenceException:
return False
class frame_to_be_available_and_switch_to_it(object):
""" An expectation for checking whether the given frame is available to
switch to. If the frame is available it switches the given driver to the
specified frame.
"""
def __init__(self, locator):
self.frame_locator = locator
def __call__(self, driver):
try:
if isinstance(self.frame_locator, tuple):
driver.switch_to.frame(_find_element(driver,
self.frame_locator))
else:
driver.switch_to.frame(self.frame_locator)
return True
except NoSuchFrameException:
return False
class invisibility_of_element_located(object):
""" An Expectation for checking that an element is either invisible or not
present on the DOM.
locator used to find the element
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
try:
return _element_if_visible(_find_element(driver, self.locator), False)
except (NoSuchElementException, StaleElementReferenceException):
# In the case of NoSuchElement, returns true because the element is
# not present in DOM. The try block checks if the element is present
# but is invisible.
# In the case of StaleElementReference, returns true because stale
# element reference implies that element is no longer visible.
return True
class element_to_be_clickable(object):
""" An Expectation for checking an element is visible and enabled such that
you can click it."""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
element = visibility_of_element_located(self.locator)(driver)
if element and element.is_enabled():
return element
else:
return False
class staleness_of(object):
""" Wait until an element is no longer attached to the DOM.
element is the element to wait for.
returns False if the element is still attached to the DOM, true otherwise.
"""
def __init__(self, element):
self.element = element
def __call__(self, ignored):
try:
# Calling any method forces a staleness check
self.element.is_enabled()
return False
except StaleElementReferenceException:
return True
class element_to_be_selected(object):
""" An expectation for checking the selection is selected.
element is WebElement object
"""
def __init__(self, element):
self.element = element
def __call__(self, ignored):
return self.element.is_selected()
class element_located_to_be_selected(object):
"""An expectation for the element to be located is selected.
locator is a tuple of (by, path)"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
return _find_element(driver, self.locator).is_selected()
class element_selection_state_to_be(object):
""" An expectation for checking if the given element is selected.
element is WebElement object
is_selected is a Boolean."
"""
def __init__(self, element, is_selected):
self.element = element
self.is_selected = is_selected
def __call__(self, ignored):
return self.element.is_selected() == self.is_selected
class element_located_selection_state_to_be(object):
""" An expectation to locate an element and check if the selection state
specified is in that state.
locator is a tuple of (by, path)
is_selected is a boolean
"""
def __init__(self, locator, is_selected):
self.locator = locator
self.is_selected = is_selected
def __call__(self, driver):
try:
element = _find_element(driver, self.locator)
return element.is_selected() == self.is_selected
except StaleElementReferenceException:
return False
class alert_is_present(object):
""" Expect an alert to be present."""
def __init__(self):
pass
def __call__(self, driver):
try:
alert = driver.switch_to.alert
alert.text
return alert
except NoAlertPresentException:
return False
def _find_element(driver, by):
"""Looks up an element. Logs and re-raises ``WebDriverException``
if thrown."""
try:
return driver.find_element(*by)
except NoSuchElementException as e:
raise e
except WebDriverException as e:
raise e
def _find_elements(driver, by):
try:
return driver.find_elements(*by)
except WebDriverException as e:
raise e
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