Selenium：Internet Explorer中的NoSuchElementException

Question

我正在尝试从Selenium IDE将内部Web应用程序的Selenium脚本移植到使用Java中的RemoteWebDrivers的Selenium Grid设置。

这些脚本适用于Chrome和Firefox，但不适用于Internet Explorer。 每次我尝试在页面中找到一个元素时，我只会得到一个NoSuchElementException（页面本身加载得很好）。

使用Wikipedia页面显示相同行为的示例代码：

public class Wikipedia_test_IE {
 private WebDriver driver = null;
 private String baseUrl = null;
 private boolean acceptNextAlert = true;
 private StringBuffer verificationErrors = new StringBuffer();


 @Before
 public void setUp() throws Exception {
//      DesiredCapabilities cap = DesiredCapabilities.firefox();
 DesiredCapabilities cap = DesiredCapabilities.internetExplorer();
 cap.setCapability(CapabilityType.VERSION, "9");

        driver = new RemoteWebDriver (new URL("http://192.168.1.230:4444/wd/hub"), cap);    
        baseUrl = "https://en.wikipedia.org/wiki/Rosetta_%28spacecraft%29";
        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
 }

 @Test
 public void testAKTargobankTestfall1KN() throws Exception {
      driver.get(baseUrl);
      driver.findElement(By.linkText("space probe")).submit();
 }
}

我尝试过使用findElement（By.Id）和findElement（By.cssSelector） - 没有效果。 在页面加载和选择之间设置延迟也没有任何效果，也没有使用点击而不是提交。

我已启用IE驱动程序的调试日志记录，但输出并不能帮助我理解问题所在 - 希望其他人可以。

server.cc(239) Command: POST /session {"desiredCapabilities":{"platform":"WINDOWS","ensureCleanSession":true,"browserName":"internet explorer","version":"9"}}
IESession.cpp(43) Mutex acquired for session initalization
IESession.cpp(105) Releasing session initialization mutex
command.cc(33) Raw JSON command: { "command" : "newSession", "locator" : { }, "parameters" : {"desiredCapabilities":{"platform":"WINDOWS","ensureCleanSession":true,"browserName":"internet explorer","version":"9"}} }
BrowserFactory.cpp(68) Ignoring Protected Mode Settings: 0
BrowserFactory.cpp(71) Checking validity of Protected Mode settings.
BrowserFactory.cpp(984) Detected IE version: 9, detected Windows version: 6
BrowserFactory.cpp(1074) Found Protected Mode setting value of 0 for zone 1
BrowserFactory.cpp(1074) Found Protected Mode setting value of 0 for zone 2
BrowserFactory.cpp(1074) Found Protected Mode setting value of 0 for zone 3
BrowserFactory.cpp(1074) Found Protected Mode setting value of 0 for zone 4
BrowserFactory.cpp(74) Has Valid Protected Mode Settings: 1
BrowserFactory.cpp(170) Starting IE using the IELaunchURL API
BrowserFactory.cpp(124) IE launched successfully with process ID 2188
BrowserFactory.cpp(130) Process with ID 2188 is executing iexplore.exe
BrowserFactory.cpp(313) Ignoring zoom setting: 0
BrowserFactory.cpp(581) Browser zoom level is 100%
IECommandExecutor.cpp(650) Persistent hovering set to: 1
ProxyManager.cpp(118) Using existing system proxy settings.
server.cc(308) Response: {"sessionId":"4aba017b-91e9-4f48-9f9f-f38b0464bb6b","status":303,"value":"/session/4aba017b-91e9-4f48-9f9f-f38b0464bb6b"}


server.cc(239) Command: GET /session/4aba017b-91e9-4f48-9f9f-f38b0464bb6b {}
command.cc(33) Raw JSON command: { "command" : "getSessionCapabilities", "locator" : { "sessionid" : "4aba017b-91e9-4f48-9f9f-f38b0464bb6b" }, "parameters" : {} }
IECommandExecutor.cpp(544) No alert handle is found
server.cc(308) Response: {"sessionId":"4aba017b-91e9-4f48-9f9f-f38b0464bb6b","status":0,"value":{"browserAttachTimeout":0,"browserName":"internet explorer","cssSelectorsEnabled":true,"elementScrollBehavior":0,"enableElementCacheCleanup":true,"enablePersistentHover":true,"handlesAlerts":true,"ie.browserCommandLineSwitches":"","ie.ensureCleanSession":false,"ie.forceCreateProcessApi":false,"ie.usePerProcessProxy":false,"ignoreProtectedModeSettings":false,"ignoreZoomSetting":false,"initialBrowserUrl":"http://localhost:15278/","javascriptEnabled":true,"nativeEvents":true,"platform":"WINDOWS","requireWindowFocus":false,"takesScreenshot":true,"unexpectedAlertBehaviour":"dismiss","version":"9"}}

server.cc(239) Command: POST /session/4aba017b-91e9-4f48-9f9f-f38b0464bb6b/timeouts/implicit_wait {"ms":30000}
command.cc(33) Raw JSON command: { "command" : "implicitlyWait", "locator" : { "sessionid" : "4aba017b-91e9-4f48-9f9f-f38b0464bb6b" }, "parameters" : {"ms":30000} }
IECommandExecutor.cpp(544) No alert handle is found
server.cc(308) Response: {"sessionId":"4aba017b-91e9-4f48-9f9f-f38b0464bb6b","status":0,"value":null}

server.cc(239) Command: POST /session/4aba017b-91e9-4f48-9f9f-f38b0464bb6b/url {"url":"https://en.wikipedia.org/wiki/Rosetta_%28spacecraft%29"}
command.cc(33) Raw JSON command: { "command" : "get", "locator" : { "sessionid" : "4aba017b-91e9-4f48-9f9f-f38b0464bb6b" }, "parameters" : {"url":"https://en.wikipedia.org/wiki/Rosetta_%28spacecraft%29"} }
IECommandExecutor.cpp(544) No alert handle is found
Browser.cpp(421) Navigate Events Completed.
Browser.cpp(452) Browser ReadyState is not '4', indicating 'Complete'; it was 1
Browser.cpp(421) Navigate Events Completed.
Browser.cpp(437) Browser busy property is true.

（最后两行重复几次）

ElementRepository.cpp(107) Refreshing managed element cache. Found 0 to remove from cache.
Browser.cpp(421) Navigate Events Completed.
Browser.cpp(476) Waiting for document to complete...
Browser.cpp(481) Not in navigating state
server.cc(308) Response: {"sessionId":"4aba017b-91e9-4f48-9f9f-f38b0464bb6b","status":0,"value":null}

server.cc(239) Command: POST /session/4aba017b-91e9-4f48-9f9f-f38b0464bb6b/element {"using":"link text","value":"space probe"}
command.cc(33) Raw JSON command: { "command" : "findElement", "locator" : { "sessionid" : "4aba017b-91e9-4f48-9f9f-f38b0464bb6b" }, "parameters" : {"using":"link text","value":"space probe"} }
IECommandExecutor.cpp(544) No alert handle is found
ElementFinder.cpp(49) Using FindElement atom to locate element having linkText = space probe
Browser.cpp(114) No child frame focus. Focus is on top-level frame
Script.cpp(485) -2147024891 [Zugriff verweigert]: Unable to execute code, call to IHTMLWindow2::execScript failed
Script.cpp(171) Cannot create anonymous function
ElementFinder.cpp(84) Unexpected error attempting to find element by mechanism linkText with criteria space probe

有任何想法吗？

Answer 1

谢谢您的帮助。 要回答上面提到的一些问题，我应该将其包含在原帖中：

- 是的，它确实是IE 9 - 我已经将保护模式设置为在所有安全区域中启用 - 使用点击而不是提交没有区别（最初）

恰好，运行Selenium节点的VM在夜间应用了安全更新，其中包括一个用于IE的安全更新。

起初，我得到了一个不同于以前的错误消息 - IE无法找到刚刚打开的浏览器窗口，窗口也没有关闭。 更新已重置所有安全设置。

重新启用保护模式后，现在一切正常。 理查德指出，我确实需要将find元素更改为.click（）而不是.submit（）。

所以，现在一切正常，我不明白为什么。 再次感谢！

Answer 2

您可能应该使用click() ，而不是submit() ：

driver.findElement(By.linkText("space probe")).click();

Answer 3

我也在测试上得到了错误，在FF上工作正常但在IE上没有。

我可以建议你：

• 检查IE上的保护模式设置。
• 禁用IE驱动程序上的本机事件。
• 在这些特定情况下使用JavaScript（在我看来最糟糕的情况）。

这是IE驱动程序的已知问题。

http://jimevansmusic.blogspot.be/2012/08/youre-doing-it-wrong-protected-mode-and.html http://jimevansmusic.blogspot.be/2013/01/revisiting-native-events-in -即，driver.html

Answer 4

尝试使用InternetExplorerDriver而不是RemoteWebDriver通常它不应该有所作为，但使用IE都可能--.-

我遇到了类似的问题，我最终得到了以下适用于我的代码：

@Before
public void setUp() {
   //... some irrelevant Code ... 

   System.setProperty("webdriver.ie.driver", "Path to IEDriver.exe");
   InternetExplorerDriver driver = new InternetExplorerDriver();

   //... some irrelevant Code ...
}

Answer 5

您可以通过以下方式编写代码：

while(true) {
    try {
        driver.findElement(By.linkText("space probe")).submit();
        break;
    } catch (Exception e) {
        continue;
    }
}

我写这样的代码，以便线程搜索直到成功。 使用implicitlyWait ，浏览器只会等待该时间的最大值。 但是可能会发生您的浏览器页面加载已完成但所需部分由ajax调用加载。 在这种情况下，您的程序将抛出错误。