Java Selenium WebDriver StaleElementReferenceException
我在运行测试时遇到此错误： org.openqa.selenium.StaleElementReferenceException:元素不再附加到DOM 关于如何解决上述异常有什么想法吗？ 这发生在我的网格中Java Selenium WebDriver StaleElementReferenceException,java,testing,selenium,webdriver,Java,Testing,Selenium,Webdriver,我在运行测试时遇到此错误： org.openqa.selenium.StaleElementReferenceException:元素不再附加到DOM 关于如何解决上述异常有什么想法吗？ 这发生在我的网格中 它有一个ref Xpath表达式，它是动态的，当您尝试使用页面上不再存在的WebElement方法时，会引发该异常。如果您的网格正在动态加载数据，并且您刷新了网格，那么对该网格上元素的任何引用都将是“过时的”。仔细检查您试图引用的元素是否在测试页面上，您可能需要重新实例化该对象。我们通过执行
它有一个ref Xpath表达式，它是动态的，当您尝试使用页面上不再存在的WebElement方法时，会引发该异常。如果您的网格正在动态加载数据，并且您刷新了网格，那么对该网格上元素的任何引用都将是“过时的”。仔细检查您试图引用的元素是否在测试页面上，您可能需要重新实例化该对象。我们通过执行称为WebDriverRapper和WebElementWrapper的操作来解决此问题 这些包装器所做的是在中处理StaleElementException，然后使用定位器重新计算并获取新的WebElement对象。这样，您需要将处理异常的代码分散到整个代码库中，并将其本地化到一个类中
我将很快研究这两个类的开源，如果你们感兴趣，我会在这里添加一个链接。我遇到了同样的问题，但找不到任何解决方案。提出了一个解决方案并发布在这里，希望这能帮助有同样问题的人。我创建了一个类来根据过时元素的类型、cssselector、id等来处理它们，并像调用任何其他页面对象一样简单地调用它
public void StaleElementHandleByID (String elementID)
{
int count = 0;
boolean clicked = false;
while (count < 4 && !clicked)
{
try
{
WebElement yourSlipperyElement= driver.findElement(By.id(elementID));
yourSlipperyElement.click();
clicked = true;
}
catch (StaleElementReferenceException e)
{
e.toString();
System.out.println("Trying to recover from a stale element :" + e.getMessage());
count = count+1;
}
}
}
public void StaleElementHandleByID（字符串elementID）
{
整数计数=0；
布尔值=假；
同时（计数<4&！单击）
{
尝试
{
WebElement yourSlipperyElement=driver.findElement（By.id（elementID））；
您的SlipperyElement.click（）；
单击=真；
}
捕获（StaleElementReferenceException e）
{
e、 toString（）；
System.out.println（“试图从过时元素中恢复：+e.getMessage（））；
计数=计数+1；
}
}
}
我建议只在您知道会导致WebDriver出现问题的元素上使用此选项。它也遇到了此问题，很明显，模态面板加载陷入竞争状态，并一直等待到超时 我已经尝试了很多次，发现解决方案是保持模态面板加载，直到webDriver能够准确地找到它，同时保持刷新webDriver实例，然后尝试在模态面板中查找WebElements 因此，解决方案如下所示： e、 g.MyModalPanel是您的ModalPanel Id，然后执行以下操作
page.openModalPanel();
Assert.assertTrue(page.waitTillDisplay( "MyModalPanelContentDiv"), Wait.MODAL_PANEL));
page.fillInFormInModalpanel(formObj);
public Boolean waitTillDisplay(final String id, int waitSeconds){
WebDriverWait wait = new WebDriverWait(driver, waitSeconds);
Boolean displayed = wait.until(new ExpectedCondition<Boolean>() {
public Boolean apply(WebDriver driver) {
return driver.findElement(By.id(id)).isDisplayed();
}
});
return displayed;
public Boolean waitTillDisplay（最终字符串id，int waitSeconds）{
WebDriverWait wait=新的WebDriverWait（驱动程序，等待秒）；
显示布尔值=等待.until（新的ExpectedCondition（）{
公共布尔应用（WebDriver驱动程序）{
返回driver.findElement（By.id（id））.isDisplayed（）；
}
});
返回显示；
}为了更灵活，我做了一些更改：
delegate void StaleFunction(IWebElement elt);
private static void StaleElementHandleByID(By by, StaleFunction func )
{
int count = 0;
while (count < 4)
{
try
{
IWebElement yourSlipperyElement = Driver.FindElement(by);
func(yourSlipperyElement);
count = count + 4;
}
catch (StaleElementReferenceException e)
{
count = count + 1;
}
}
}
快速而肮脏的解决方案：
el.click()
time.sleep(1)
然后继续以迭代的方式进行解析单击某个元素后，您可能试图获取任何元素属性
我也有同样的问题，我试图在点击按钮后获取按钮的text（）。在我的例子中，一旦单击按钮，新窗口就会出现。我使用了FluentWait和ExpectedCondition应用覆盖：。与其他人回答此问题的方式不同，此方法在最终确定的块内处理异常，并允许在该块中包装连续的尝试。我觉得这个更优雅
public static void clickByLocator( final By locator ) {
final long startTime = System.currentTimeMillis();
driver.manage().timeouts().implicitlyWait( 5, TimeUnit.SECONDS );
Wait<WebDriver> wait = new FluentWait<WebDriver>( driver )
.withTimeout(90000, TimeUnit.MILLISECONDS)
.pollingEvery(5500, TimeUnit.MILLISECONDS);
//.ignoring( StaleElementReferenceException.class );
wait.until( new ExpectedCondition<Boolean>() {
@Override
public Boolean apply( WebDriver webDriver ) {
try {
webDriver.findElement( locator ).click();
return true;
} catch ( StaleElementReferenceException e ) { // try again
return false;
}
}
} );
driver.manage().timeouts().implicitlyWait( DEFAULT_IMPLICIT_WAIT, TimeUnit.SECONDS );
long endTime = System.currentTimeMillis();
long totalTime = endTime - startTime;
log("Finished click after waiting for " + totalTime + " milliseconds.");
}
public static void clickByLocator（最终由定位器确定）{
最终长启动时间=System.currentTimeMillis（）；
driver.manage（）.timeouts（）.implicitlyWait（5，TimeUnit.SECONDS）；
等待等待=新建FluentWait（驱动程序）
.withTimeout（90000，时间单位为毫秒）
.pollingEvery（5500，时间单位为毫秒）；
//.忽略（StaleElementReferenceException.class）；
等待.until（新的ExpectedCondition（）{
@凌驾
公共布尔应用（WebDriver WebDriver）{
试一试{
webDriver.findElement（定位器）。单击（）；
返回true；
}捕获（StaleElementReferenceException e）{//重试
返回false；
}
}
} );
driver.manage（）.timeouts（）.implicitlyWait（默认值\u IMPLICIT\u WAIT，TimeUnit.SECONDS）；
long-endTime=System.currentTimeMillis（）；
长总时间=结束时间-开始时间；
日志（“等待“+totalTime+”毫秒后完成单击”）；
}
public static Boolean executeElementSendKeys
(WebDriver driver, WebElement element, String sInputParameters) throws Exception {
return (Boolean) executeElementMaster
(driver, element, "sendKeys", sInputParameters, 30, true);
}
public static Boolean executeElementClear
(WebDriver driver, WebElement element) throws Exception {
return (Boolean) executeElementMaster (driver, element, "clear", "", 30, true);
}
public static String executeElementGetText
(WebDriver driver, WebElement element) throws Exception {
return (String) executeElementMaster (driver, element, "getText", "", 30, true);
}
public static Boolean executeElementClick
(WebDriver driver, WebElement element) throws Exception {
return (Boolean) executeElementMaster (driver, element, "click", "", 30, true);
}
public static boolean executeElementIsDisplayed
(WebDriver driver, WebElement element) throws Exception {
return (Boolean) executeElementMaster (driver, element, "isDisplayed", "", 30, true);
}
public static String executeElementGetAttribute
(WebDriver driver, WebElement element, String sInputParameters) throws Exception {
return (String) executeElementMaster
(driver, element, "getAttribute", sInputParameters, 30, true);
}
StaleElementReferenceExceptionStaleElementReferenceException（异常e）（StaleElementReferenceException e）private static Object executeElementMaster(WebDriver driver, WebElement element, String sExecuteAction, String sInputParametersOptional, int MaxTimeToWait,
boolean bExpectedElementState) throws Exception {
try {
// Local variable declaration
String sElementString = "";
String sElementXpath = "";
Object ReturnValue = "";
int Index = 0;
boolean bCurrentElementState = true;
boolean bWebDriverWaitUntilElementClickableFlag = false;
System.out.println("**** Execute method '" + sExecuteAction + "' on '" + sElementString + "' - Expected : '" + bExpectedElementState + "'");
System.out.println("**** MaxTimeToWait ='" + MaxTimeToWait + "' seconds");
// Set browser timeout to 1 second. Will be reset to default later
driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);
// Keep trying until 'MaxTimeToWait' is reached
for (int i = 0; i < MaxTimeToWait; i++) {
try {
// Get element xPath - and find element again
if (element != null && i < 2 && sElementString == "") {
sElementString = (element).toString();
if (sElementString.contains("xpath: ")) {
// Retrieve xPath from element, if available
Index = sElementString.indexOf("xpath: ");
sElementXpath = sElementString.substring(Index + 7, sElementString.length());
}
}
// Find Element again
if (sElementXpath != "" && i > 0) {
element = driver.findElement(By.xpath(sElementXpath));
}
// Execute the action requested
switch (sExecuteAction) {
case ("isDisplayed"):
// Check if element is displayed and save in bCurrentElementState variable
ReturnValue = element.isDisplayed();
bCurrentElementState = (Boolean) ReturnValue;
bWebDriverWaitUntilElementClickableFlag = true;
break;
case ("getText"):
ReturnValue = element.getText();
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
case ("sendKeys"):
// Scroll element into view before performing any action
element.sendKeys(sInputParametersOptional);
ReturnValue = true;
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
case ("clear"):
// Scroll element into view before performing any action
element.clear();
ReturnValue = true;
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
case ("click"):
// Scroll element into view before performing any action
element.click();
ReturnValue = true;
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
default:
ReturnValue = element.getAttribute(sInputParametersOptional);
bCurrentElementState = true;
break;
}
} catch (Exception e) {
Thread.sleep(500);
bCurrentElementState = false;
ReturnValue = false;
}
if (bCurrentElementState == bExpectedElementState) {
// If element's actual and expected states match, log result and return value
System.out.println("**** PASSED: Execute method '" + sExecuteAction + "' on '" + sElementString + "' - Returned '" + ReturnValue + "' **** \n"
+ "Actual element status: '" + bCurrentElementState + "' Expected element status: '" + bExpectedElementState + "'");
break;
} else {
// If element's actual and expected states do NOT match, loop until they match or timeout is reached
Thread.sleep(500);
}
}
// Reset browser timeout to default
driver.manage().timeouts().implicitlyWait(3, TimeUnit.SECONDS);
// Return value before exiting
if (bCurrentElementState != bExpectedElementState) {
// If element's actual and expected states do NOT match, log result and return value
System.out.println("**** FAILED: Execute method '" + sExecuteAction + "' on '" + sElementString + "' - Returned '" + ReturnValue + "' **** \n"
+ "Actual element status: '" + bCurrentElementState + "' Expected element status: '" + bExpectedElementState + "'");
if (sExecuteAction.equalsIgnoreCase("findElement")) {
ReturnValue = null;
}
}
return ReturnValue;
} catch (Exception e) {
System.out.println("Exception in executeElementMaster - " + e.getMessage());
throw (e);
}
}
私有静态对象executeElementMaster（WebDriver驱动程序、WebElement元素、String SexecutAction、String sInputParametersOptional、int MaxTimeToWait、，
布尔值beExpectedElementState）引发异常{
试一试{
//局部变量声明
字符串sElementString=“”；
字符串sElementXpath=“”；
对象返回值=”；
int指数=0；
布尔bCurrentElementState=true；
布尔值bWebDriverWituntileLementClickableFlag=false；
System.out.println（“**Execute method””+sexecutAction+“'on”“+sElementString+”）-应为“+beExpectedElementState+””；
系统
private static Object executeElementMaster(WebDriver driver, WebElement element, String sExecuteAction, String sInputParametersOptional, int MaxTimeToWait,
boolean bExpectedElementState) throws Exception {
try {
// Local variable declaration
String sElementString = "";
String sElementXpath = "";
Object ReturnValue = "";
int Index = 0;
boolean bCurrentElementState = true;
boolean bWebDriverWaitUntilElementClickableFlag = false;
System.out.println("**** Execute method '" + sExecuteAction + "' on '" + sElementString + "' - Expected : '" + bExpectedElementState + "'");
System.out.println("**** MaxTimeToWait ='" + MaxTimeToWait + "' seconds");
// Set browser timeout to 1 second. Will be reset to default later
driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);
// Keep trying until 'MaxTimeToWait' is reached
for (int i = 0; i < MaxTimeToWait; i++) {
try {
// Get element xPath - and find element again
if (element != null && i < 2 && sElementString == "") {
sElementString = (element).toString();
if (sElementString.contains("xpath: ")) {
// Retrieve xPath from element, if available
Index = sElementString.indexOf("xpath: ");
sElementXpath = sElementString.substring(Index + 7, sElementString.length());
}
}
// Find Element again
if (sElementXpath != "" && i > 0) {
element = driver.findElement(By.xpath(sElementXpath));
}
// Execute the action requested
switch (sExecuteAction) {
case ("isDisplayed"):
// Check if element is displayed and save in bCurrentElementState variable
ReturnValue = element.isDisplayed();
bCurrentElementState = (Boolean) ReturnValue;
bWebDriverWaitUntilElementClickableFlag = true;
break;
case ("getText"):
ReturnValue = element.getText();
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
case ("sendKeys"):
// Scroll element into view before performing any action
element.sendKeys(sInputParametersOptional);
ReturnValue = true;
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
case ("clear"):
// Scroll element into view before performing any action
element.clear();
ReturnValue = true;
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
case ("click"):
// Scroll element into view before performing any action
element.click();
ReturnValue = true;
bCurrentElementState = true;
bWebDriverWaitUntilElementClickableFlag = false;
break;
default:
ReturnValue = element.getAttribute(sInputParametersOptional);
bCurrentElementState = true;
break;
}
} catch (Exception e) {
Thread.sleep(500);
bCurrentElementState = false;
ReturnValue = false;
}
if (bCurrentElementState == bExpectedElementState) {
// If element's actual and expected states match, log result and return value
System.out.println("**** PASSED: Execute method '" + sExecuteAction + "' on '" + sElementString + "' - Returned '" + ReturnValue + "' **** \n"
+ "Actual element status: '" + bCurrentElementState + "' Expected element status: '" + bExpectedElementState + "'");
break;
} else {
// If element's actual and expected states do NOT match, loop until they match or timeout is reached
Thread.sleep(500);
}
}
// Reset browser timeout to default
driver.manage().timeouts().implicitlyWait(3, TimeUnit.SECONDS);
// Return value before exiting
if (bCurrentElementState != bExpectedElementState) {
// If element's actual and expected states do NOT match, log result and return value
System.out.println("**** FAILED: Execute method '" + sExecuteAction + "' on '" + sElementString + "' - Returned '" + ReturnValue + "' **** \n"
+ "Actual element status: '" + bCurrentElementState + "' Expected element status: '" + bExpectedElementState + "'");
if (sExecuteAction.equalsIgnoreCase("findElement")) {
ReturnValue = null;
}
}
return ReturnValue;
} catch (Exception e) {
System.out.println("Exception in executeElementMaster - " + e.getMessage());
throw (e);
}
}
//.. (first page asserts)
//...
element.Click();
Thread.Sleep(200);
//.. (second page asserts)
//...