哪個元素給StaleElementReferenceError？

所以我的代碼是給我[remote server] resource://fxdriver/modules/web-element-cache.js:8325:24:in `fxdriver.cache.getElementAt': Element is no longer attached to the DOM (Selenium::WebDriver::Error::StaleElementReferenceError)哪個元素給StaleElementReferenceError？

有在代碼中使用了多種元素，我想看看哪些元素是給我這個錯誤，所以我可以確保有是它的一個wait。

編輯下面是代碼：

path = [".//*[@id='sub_nav_content']/table/tbody/tr[2]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[3]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[4]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[5]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[6]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[7]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[8]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[9]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[10]/td[3]/a", ".//*[@id='sub_nav_content']/table/tbody/tr[11]/td[3]/a"] 
path.each do |path| 
    begin 
     wait.until { 
      element = browser.find_element(:xpath => path) 
      element if element.displayed? 
     } 
     browser.find_element(:xpath => path).click 
     table = wait.until { 
      element = browser.find_element(id: "possible_matched") 
      element if element.displayed? 
     } 
     if table 
      puts "Table Found" 
     else 
      puts "Table Error" 
     end 
     #creates an 2D array containing patient name, admit date and prints to screen 
     names = browser.find_elements(:xpath => ".//*[@id='possible_matched']/table/tbody/tr/td[1]") 
     name_array = [] 
     names.each { |name| name_array << name.text} 
     admits = browser.find_elements(:xpath => ".//*[@id='possible_matched']/table/tbody/tr/td[5]") 
     admit_array = [] 
     admits.each { |date| admit_array << date.text } 
     name_admit_array = name_array.zip(admit_array) 
     name_admit_array.each do |name, date| 
      puts "#{name}: #{date}" 
     end 
     #finds the location of the sub-array containing patient name and collection associated admit date 
     patient_name = browser.find_element(:xpath => ".//*[@id='dialog-modal-cancel-hl7-preview']/table/tbody/tr[2]/td[1]").text 
     collected_date = browser.find_element(:xpath => ".//*[@id='dialog-modal-cancel-hl7-preview']/table/tbody/tr[2]/td[4]").text 
     puts patient_name 
     puts collected_date 
     mo, da, yr = collected_date.split('/').map(&:to_i) 
     cd = [yr, mo, da] 
     bl = name_admit_array.each_with_index.select { |(name, date), i| 
      m, d, y = date.split('/').map(&:to_i) 
      dt = [y, m, d] 
      name.downcase == patient_name.downcase and (dt <=> cd)<0 
     }.map {|x, i| i } 

     blf = name_admit_array.values_at(*bl) 
     if bl.any? 
      bf = blf.rindex(blf.max) + 2 
      wait.until { 
       element = browser.find_element(:xpath => ".//*[@id='possible_matched']/table/tbody/tr[#{bf}]/td[6]/div/a") 
       element if element.displayed? 
      } 
      browser.find_element(:xpath => ".//*[@id='possible_matched']/table/tbody/tr[#{bf}]/td[6]/div/a").click 
     else 
      browser.find_element(:xpath => "html/body/div[6]/div[1]/a/span").click 
     end 
    end while bl.any? 
end

來源

2014-09-22 Shane Carroll

請在代碼中添加。通常'StaleElementException'是一個元素的位置，頁面改變，並嘗試在頁面更改後使用元素。由於頁面中的點擊或訪問其他頁面並返回，頁面可能會更改。很可能這可以通過確保在執行對頁面進行更改的操作之後獲得對元素的新引用來解決。 – Richard 2014-09-22 16:58:57

添加了代碼。我看到發生了什麼（元素正在被更改，因爲即使xpath保持不變，DOM也會被更新）我只是不知道如何解決它，或者確切地知道它何時發生。 – 2014-09-22 17:47:06

檢查錯誤的完整堆棧跟蹤，這將指向引發異常的確切行。

來源

2014-09-22 16:37:23

對不起，我在這一切都是全新的。我如何檢查堆棧跟蹤？ – 2014-09-23 14:42:48

哪個元素給StaleElementReferenceError？

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