Why can't Selenium Web Driver find the elements in this case?-CodePudding

Selenium newbie here. The examples I tried so far worked well but now I stumbled upon a case that seemingly doesn't work:

import java.util.List;

import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

public class GeckoDriverTest
{

public static void main(String[] args) throws Throwable
{
    System.setProperty("webdriver.gecko.driver", "D://XXX/seleniumdrivers/geckodriver.exe");
    FirefoxDriver driver=new FirefoxDriver();
    driver.manage().window().maximize();
    driver.get("https://www.aerzen.com/de/karriere/stellenangebote.html");

    
    System.out.println("URL = " driver.getCurrentUrl());
    
    Thread.sleep(3000);
    
    driver.findElement(By.cssSelector("a.consent-banner--accept.button.submit")).click();

    Thread.sleep(3000);
    
    System.out.println("URL = " driver.getCurrentUrl());
    
    List<WebElement> elements = driver.findElements(By.cssSelector("tr > td > a"));
    System.out.println("Elements: " elements.size());
    for(WebElement element : elements)
    {
        String url = element.getAttribute("href");
        System.out.println(url);
    }
}
}

The first part does work but the "tr > td > a" selector doesn't find any elements although I'm pretty sure they exist (I can see them in the browser window).

Any idea what's going wrong there? Thanks a lot.

CodePudding user response：

The table is inside an iframe. In order to access these elements you will need to switch to that iframe.
Also instead of tr > td > a cssSelector try using table td.real_table_col1 a cssSelector.
This should work better:

wait.until(ExpectedConditions.presenceOfElementLocated(By.xpath("//iframe")));
driver.switchTo().frame(driver.findElement(By.xpath("//iframe")));
List<WebElement> elements = driver.findElements(By.cssSelector("table td.real_table_col1 a"));
    System.out.println("Elements: " elements.size());
    for(WebElement element : elements)
    {
        String url = element.getAttribute("href");
        System.out.println(url);
    }

Also instead of hardcoded pauses like

Thread.sleep(3000);

You should use ExpectedConditions something like

WebdriverWait wait = new WebDriverWait(driver, 30);
wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("a.consent-banner--accept.button.submit")));