不斷收到元素沒有連接到網頁文件

Question

我運行下面的代碼來驗證網頁上的文字：

def verifyText(self, Text): 
    try: 
     self.switchToFrame(*MainPageLocatars.FRAMEONE) 
     self.switchToFrame(*MainPageLocatars.SUBLISTFRAME) 
    except: 
     pass 
    self.row.find_element_by_xpath(ListViewLocatars.VERIFYTEXT % Text) 

我試過（2）每個步驟之後加入time.sleep但它仍然是給我一個錯誤，當我運行這個功能 - >>不斷得到元件沒有以這行代碼

self.row.find_element_by_xpath(ListViewLocatars.VERIFYTEXT % Text) 

我在這裏調用該函數，我應該在哪裏重新定義它附加到頁面文件錯誤？

listview = ListView(self.driver, 'First') 
listview.verifyText("comp1") 

注意，行父：

self.row = self.driver.find_element_by_xpath(ListViewLocatars.ROWPARENT % INDEX_MAP[index]) 

這是我如何定義函數：

class ListView(Page): 

    def __init__(self, driver, index): 

     if index not in INDEX_MAP: 
      raise ValueError("Invalid index %s" % index) 

     self.driver = driver 

     try: 
      self.row = self.driver.find_element_by_xpath(ListViewLocatars.ROWPARENT % INDEX_MAP[index]) 
     # used for VerifyText function only 
     except: 
      self.row = self.driver.find_element_by_xpath(ListViewLocatars.TEXTPARENT % INDEX_MAP[index]) 


    def verifyText(self, Text): 
     try: 
      self.switchToFrame(*MainPageLocatars.FRAMEONE) 
      self.switchToFrame(*MainPageLocatars.SUBLISTFRAME) 
     except: 
      pass 
     self.row.find_element_by_xpath(ListViewLocatars.VERIFYTEXT % Text) 

這裏是全碼：

# all locaters for this class are defined here only 
class ListView(Page): 

    def __init__(self, driver, index): 

     if index not in INDEX_MAP: 
      raise ValueError("Invalid index %s" % index) 

     self.driver = driver 

     try: 
      self.row = self.driver.find_element_by_xpath(ListViewLocatars.ROWPARENT % INDEX_MAP[index]) 
     # used for VerifyText function only 
     except: 
      self.row = self.driver.find_element_by_xpath(ListViewLocatars.TEXTPARENT % INDEX_MAP[index]) 

    @property  
    def row(self): 
     return self.driver.find_element_by_xpath(ListViewLocatars.ROWPARENT % INDEX_MAP[index]) 


    def verifyText(self, Text): 
     try: 
      self.switchToFrame(*MainPageLocatars.FRAMEONE) 
      self.switchToFrame(*MainPageLocatars.SUBLISTFRAME) 
     except: 
      pass 
     self.row.find_element_by_xpath(ListViewLocatars.VERIFYTEXT % Text) 

這是現在給我這個錯誤：

Traceback (most recent call last): 
    File "autoLoaderTest.py", line 56, in test02_AutoLoaderSubCompany 
    listview = ListView(self.driver, 'First') 
    File "C:\Users\cverma\Desktop\SOAPProject\mainPage.py", line 44, in __init__ 
    self.row = self.driver.find_element_by_xpath(ListViewLocatars.TEXTPARENT % INDEX_MAP[index]) 
AttributeError: can't set attribute 

Answer 1

這是StaleElementReferenceException如何被觸發以及如何避免它的簡化版本。

我想你的代碼就像下面：

self.row = self.driver.find_element_by_xpath(ListViewLocatars.ROWPARENT % INDEX_MAP[index]) 
# Now your self.row is accessible. You can use it 
self.driver.find_element_by_xpath('//input[@type="text"]').send_keys('some data') 
# This action could trigger page refresh 
# Now your self.row is not accessible as it was found on previous page 
self.row.find_element_by_xpath(ListViewLocatars.VERIFYTEXT % Text) 
# Here comes StaleElementReferenceException 

如何能避免的話：

@property 
def row(self): 
    return self.driver.find_element_by_xpath(ListViewLocatars.ROWPARENT % INDEX_MAP[index]) 

def verifyText(self, Text): 
    try: 
     self.switchToFrame(*MainPageLocatars.FRAMEONE) 
     self.switchToFrame(*MainPageLocatars.SUBLISTFRAME) 
    except: 
     pass 
    self.row.find_element_by_xpath(ListViewLocatars.VERIFYTEXT % Text) 
    # only now self.row is defined and even if page refreshed 
    # next time you call self.row, element will be re-defined