Intermittent issue with Webdriver executeScript failing to detect dynamically created elements

Question

Intermittent issue with Webdriver executeScript failing to detect dynamically created elements

It has taken me quite a while to come to terms with this, and I am still facing difficulties. My goal is to access dynamically generated elements on a web page using JavaScript injection through Selenium WebDriver. For instance:

 String hasclass = js.executeScript("return document.getElementById('additional-details').children[0].children[0].children[" + k + "].children[0].classList.contains(\"results-execs-name\")").toString();

When I run this script in the Firefox console, it runs smoothly. However, when executed in WebDriver, it throws an exception 5-6 times out of 10 (even though the element does physically exist).

Why is this happening? And what could be the solution? Any hints or answers that are helpful will be greatly appreciated.

EDIT:

I have already incorporated Thread.sleep(500) and even waited for 1000 seconds before each occurrence of executeScript() in my code. Still, there seems to be no improvement.

Below is a partial stack trace:

org.openqa.selenium.WebDriverException: document.getElementById(...).children[0].children[0] is undefined
Command duration or timeout: 169 milliseconds
Build info: version: '2.39.0', revision: 'ff23eac', time: '2013-12-16 16:12:12'
System info: host: 'rahulserver-PC', ip: '121.245.92.68', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_17'
Session ID: 747d2095-09f3-48b9-a433-59c5e334d430
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{platform=XP, databaseEnabled=true, cssSelectorsEnabled=true, javascriptEnabled=true, acceptSslCerts=true, handlesAlerts=true, browserName=firefox, webStorageEnabled=true, nativeEvents=false, rotatable=false, locationContextEnabled=true, applicationCacheEnabled=true, takesScreenshot=true, version=31.0}]
    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:525)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:193)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:554)
    at org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:463)
    at Scraper.main(Scraper.java:62)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

java javascript selenium selenium-webdriver selenium-firefoxdriver

Answer 1

Answer №1

When it comes to verifying CSS classes, there is no requirement to run a script. This task can be accomplished using pure Java code. The following method has proven to be effective for me:

String cssClass = driver.findElement(By.xpath(xpath)).getAttribute("class");
assertTrue(cssClass.contains("disabledentry"));

Answer 2

When it comes to verifying CSS classes, there is no requirement to run a script. This task can be accomplished using pure Java code. The following method has proven to be effective for me:

String cssClass = driver.findElement(By.xpath(xpath)).getAttribute("class");
assertTrue(cssClass.contains("disabledentry"));

Answer 3

Answer №2

When dealing with dynamically generated lists, utilizing xPath is the most effective way to locate the elements.

To find a better solution, consider where the element is being dynamically generated – it could be within a table, a ul/li, or elsewhere.

Start by identifying the xPath of the parent element, such as the table or list item.

Next, create a dynamic xPath that targets the specific position of the element using a loop. Check out the code snippet below:

String xPath_1 = ".//li[@class='item drop-shadow tiny-shadow' and position()=";
String xPath_2 = "]//div[@class='item-inner']//a";
String finalxPath = xPath_1 + i + xPath_2;

Develop a method called fluentWait to wait for the element to appear rather than relying on thread sleep. Thread sleep can lead to unreliable results and test failures. Additionally, the fluentWait method will handle NoSuchElementException(and other exceptions like StateStateException). See the code snippet below:

public void fluentWait(final By by)
{
    FluentWait<WebDriver> wait = new FluentWait<WebDriver>(driver)
           .withTimeout(60, TimeUnit.SECONDS)
           .pollingEvery(5, TimeUnit.SECONDS)
           .ignoring(NoSuchElementException.class);
       WebElement foo = wait.until(new Function<WebDriver, WebElement>() {
         public WebElement apply(WebDriver driver) {
           return driver.findElement(by);
         }
       });
}

Finally, call this method with your dynamically generated xPath in the following manner:
```
fluentWait(By.xpath(finalxPath ));
```

If you want to learn more about xPaths, check out this helpful Tutorial. Give it a try and let me know how it goes. Cheers!

Answer 4

When dealing with dynamically generated lists, utilizing xPath is the most effective way to locate the elements.

To find a better solution, consider where the element is being dynamically generated – it could be within a table, a ul/li, or elsewhere.

Start by identifying the xPath of the parent element, such as the table or list item.

Next, create a dynamic xPath that targets the specific position of the element using a loop. Check out the code snippet below:

String xPath_1 = ".//li[@class='item drop-shadow tiny-shadow' and position()=";
String xPath_2 = "]//div[@class='item-inner']//a";
String finalxPath = xPath_1 + i + xPath_2;

Develop a method called fluentWait to wait for the element to appear rather than relying on thread sleep. Thread sleep can lead to unreliable results and test failures. Additionally, the fluentWait method will handle NoSuchElementException(and other exceptions like StateStateException). See the code snippet below:

public void fluentWait(final By by)
{
    FluentWait<WebDriver> wait = new FluentWait<WebDriver>(driver)
           .withTimeout(60, TimeUnit.SECONDS)
           .pollingEvery(5, TimeUnit.SECONDS)
           .ignoring(NoSuchElementException.class);
       WebElement foo = wait.until(new Function<WebDriver, WebElement>() {
         public WebElement apply(WebDriver driver) {
           return driver.findElement(by);
         }
       });
}

Finally, call this method with your dynamically generated xPath in the following manner:
```
fluentWait(By.xpath(finalxPath ));
```

If you want to learn more about xPaths, check out this helpful Tutorial. Give it a try and let me know how it goes. Cheers!

Answer 5

Answer №3

When using Selenium, it's important to remember that script execution can sometimes take a bit of time. If you're encountering situations where your script is intermittently failing, consider adding a Thread.sleep(500) to see if it helps. Otherwise, JUnit may end up evaluating assertions before the script has completed.

Answer 6

When using Selenium, it's important to remember that script execution can sometimes take a bit of time. If you're encountering situations where your script is intermittently failing, consider adding a Thread.sleep(500) to see if it helps. Otherwise, JUnit may end up evaluating assertions before the script has completed.

Intermittent issue with Webdriver executeScript failing to detect dynamically created elements

Answer №1

Answer №2

Answer №3

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