StaleElementReferenceException:元素不再附加到DOM:Selenium [英] StaleElementReferenceException: Element is no longer attached to the DOM: Selenium

问题描述

我是自动化测试的新手.在参考了一些教程之后，我创建了一个自动测试用例.我尝试自动化的测试用例是在单击表的标题之一后检查排序是否正确.

I am completely new to automation testing. After referring some tutorials, I have created an automated test case. The test case I try to automate is to check whether the sorting worked correctly after I click on one of the headers of a table.

我的自动测试用例失败，但出现以下异常:

My automated test case fails with the following exception:

org.openqa.selenium.StaleElementReferenceException: Element is no longer attached to the DOM
Command duration or timeout: 12 milliseconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '2.25.0', revision: '17482', time: '2012-07-18 21:08:56'
System info: os.name: 'Linux', os.arch: 'amd64', os.version: '2.6.35-30-generic',     java.version: '1.6.0_20'
Driver info: driver.version: RemoteWebDriver
Session ID: 95b80ea0-26ac-45e0-a407-79f5b687504a
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at  sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:188)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:498)
at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:244)
at org.openqa.selenium.remote.RemoteWebElement.findElements(RemoteWebElement.java:169)
at org.openqa.selenium.remote.RemoteWebElement.findElementsByTagName(RemoteWebElement.java:240)
at org.openqa.selenium.By$ByTagName.findElements(By.java:312)
at org.openqa.selenium.remote.RemoteWebElement.findElements(RemoteWebElement.java:151)
at Sorting.sorting_column(Sorting.java:68)

以下是代码:

        //Fetching values from the column of a table
    WebElement table = driver.findElement(By.id("dnn_ctr381_View_DealerList_ctl00"));
    List<WebElement> rows = table.findElements(By.tagName("tr"));

    for (WebElement row : rows) {

        List<WebElement> cells = row.findElements(By.tagName("td"));
        if (!cells.isEmpty() && cells.get(0).isDisplayed()) {
            a = cells.get(0).getText();
        }
        b[i] = a;
        i++;
    }
    //Click on column header to sort   
    driver.findElement(By.cssSelector("html body#Body form#Form div#container.container div#Wrapper div#Main div#Panes div#ContentsContainer.box-shadow div#Contents div#Content div#dnn_ContentPane.MainContent div.DnnModule div.dnnPEMContNotitle div#dnn_ctr381_ContentPane.dnnPEMContNotitleBody div#dnn_ctr381_ModuleContent.DNNModuleContent div#dnn_ctr381_View_dnn_ctr381_View_DealerListPanel div#dnn_ctr381_View_DealerList.RadGrid table#dnn_ctr381_View_DealerList_ctl00.rgMasterTable thead tr th.rgHeader a")).click();
    WebElement table1 = driver.findElement(By.id("dnn_ctr381_View_DealerList_ctl00"));
    List<WebElement> rows1 = table1.findElements(By.tagName("tr"));
    for (WebElement row1 : rows1) {
        List<WebElement> cells1 = row1.findElements(By.tagName("td"));// Exception here
        if (!cells1.isEmpty() && cells1.get(0).isDisplayed()) 
            {

         c = cells1.get(0).getText();

       }

此行例外:

List<WebElement> cells = row1.findElements(By.tagName("td"));

有人可以让我知道这个问题的原因以及如何解决吗?

Can someone please let me know the cause of this isse and how it can be resolved?

感谢您的帮助

推荐答案

StaleElementException告诉您在客户端代码中(通过findElement引用)的DOM元素不再存在. .在您的情况下，row1元素不再存在.当然，这是一个时间问题，因为您要单击的排序刚好在上面，因此不小心确保排序已完成.如果没有更多关于如何实现排序或花费多长时间的见解，那将是我的最佳猜测.如果在遍历DOM对象时排序结束，则这些对象将在DOM中重新排列并丢失在客户端代码中

StaleElementException is there to tell you that a DOM element that you've referenced in your client code (by a findElement) doesn't exist anymore. In your case, the row1 element doesn't exist anymore. It is certainly a timing issue, as your click to sort is just above, and no care is taken to ensure the sort has finished. Without more insight in how the sort is implemented, or how long it takes, it'd be my best guess. If the sort ends while you iterate through your DOM objects, these will be rearranged in the DOM and lost in your client code

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