How to use EventListener class of org.openqa.selenium.events package

this below code works for me in Selenium 3 and chrome version 58.

    WebDriver driver = new ChromeDriver();
    driver.get("http://yahoo.com");  
    ((JavascriptExecutor)driver).executeScript("window.open()");
    ArrayList<String> tabs = new ArrayList<String>(driver.getWindowHandles());
    driver.switchTo().window(tabs.get(1));
    driver.get("http://google.com");

Page is not menu. Page has menu. We can extend only if it IS A relationship. Otherwise go with composition over inheritance principle.

I would suggest you to go with Page Fragments for better reusability.

That is, you create reusable components called 'Page Fragments' as shown here and use it in the Page Objects.

java -jar seleniumjar.jar -Dwebdriver.chrome.driver=./chromedriver 

If you want to specifiy the port do

java -jar seleniumjar.version.jar -Dwebdriver.chrome.driver=./chromedriver -port 4545

As of 3.8.1, specifying the driver is no longer necessary:

java -jar seleniumjar.jar

Your questions:

Q 1.) I would like to know why it returns all the texts that following the div?
It should not and I think in will not. It returns all div with 'id' attribute value equal 'containter' (and all children of this). But you are printing the results with ele.getText() Where getText will return all text content of all children of your result.

Get the visible (i.e. not hidden by CSS) innerText of this element, including sub-elements, without any leading or trailing whitespace.
Returns:
The innerText of this element.

Q 2.) how should I modify the code so it just return first or first few nodes that follow the parent note
This is not really clear what you are looking for. Example:

<p1> <div/> </p1 <p2/> 

The following to parent of the div is p2. This would be:

 //div[@id='container'][1]/parent::*/following-sibling::* 

or shorter

 //div[@id='container'][1]/../following-sibling::* 

If you are only looking for the first one extent the expression with an "predicate" (e.g [1] - for the first one. or [position() < 4]for the first three)

If your are looking for the first child of the first div:

//div[@id='container'][1]/*[1]

If there is only one div with id an you are looking for the first child:

   //div[@id='container']/*[1]

and so on.

Create a inner class that implements Runnable and call it from a new Thread in com.util.SeleneseTestCase run() method. Something like this:

class YourTestCase extends SeleneseTestCase {
    public class MyRunnable implements Runnable {
        public void run() {
            // Do your have work here
        }
    }

    public void testMethodToExecuteInThread() {
        MyRunnable r = new MyRunnable();
        Thread t = new Thread(r);
        t.start();
    }
}

Update to use outside YourTestCase class

To run an inner class from another class you would need to make it public and then from the outer class execute this:

YourTestCase testCase = new YourTestCase();
YourTestCase.MyRunnable r = testCase.new MyRunnable();

But if you don't need to call it from inside your test case you'd better go with a normal class, make MyRunnable a public class without being in YourTestCase.

Hope it helps.

HTML5 Canvas

The HTML element is used to draw graphics, on the fly, via JavaScript. The element is only a container for graphics. You must use JavaScript to actually draw the graphics. Canvas has several methods for drawing paths, boxes, circles, text, and adding images.

In general, to scroll the mousewheel up and down we could have opted for the Actions Class. But as per Automated Testing of HTML5 Canvas Applications with Selenium WebDriver it seems this API is not that reliable. In Firefox, every mouse down, mouse up, or mouse click happens at the center of the element. So the code above produces a mouse move event to the provided (x,y), then a mouse move event to the center of the Canvas, then a mouse down, mouse up, and click all at the center of the Canvas. That may be fine for a button, but is unworkable for a Canvas, where you want to be able to hover, click, etc. at a specific location. The situation is even worse in Safari, where it just produces an exception indicating that mouse move events aren't supported. Chrome, meanwhile, works fine.

Alternative

An work around would be to use the JavascriptExecutor Interface manually dispatching synthesized mouse events using JavaScript.

Taking a leaf out of @FlorentB.'s answer, to scroll a mousewheel up and down, you can emit the mouseover, mousemove and wheel events to the top element with a script injection and you can use the following solution:

• Code Block:

  package demo;
  
  import org.openqa.selenium.By;
  import org.openqa.selenium.JavascriptExecutor;
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.WebDriverException;
  import org.openqa.selenium.WebElement;
  import org.openqa.selenium.chrome.ChromeDriver;
  import org.openqa.selenium.chrome.ChromeOptions;
  import org.openqa.selenium.support.ui.ExpectedConditions;
  import org.openqa.selenium.support.ui.WebDriverWait;
  
  public class Canvas {
  
      static WebDriver driver;
      public static void main(String[] args) {
  
          System.setProperty("webdriver.chrome.driver", "C:\\Utility\\BrowserDrivers\\chromedriver.exe");
          ChromeOptions options = new ChromeOptions();
          options.addArguments("start-maximized");
          options.addArguments("disable-infobars");
          options.addArguments("--disable-extensions");
          driver = new ChromeDriver(options);
          driver.get("https://www.google.co.uk/maps");
          WebElement elm = new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("#scene > div.widget-scene > canvas")));
          // Mouse wheel UP or Zoom In 
          wheel_element(elm, -500, 0, 0);
          System.out.println("Mouse wheel UP or Zoom In through Wheel achieved !!!");
          // Mouse wheel DOWN or Zoom Out 
          wheel_element(elm, 120, 0, 0);
          System.out.println("Mouse wheel DOWN or Zoom Out through Wheel achieved !!!");
          System.out.println("Mouse Scroll through Wheel achieved !!!");
      }
  
      public static void wheel_element(WebElement element, int deltaY, int offsetX, int offsetY)
      {
          try{
                String script = "var element = arguments[0];"
                  +"var deltaY = arguments[1];"
                  +"var box = element.getBoundingClientRect();"
                  +"var clientX = box.left + (arguments[2] || box.width / 2);"
                  +"var clientY = box.top + (arguments[3] || box.height / 2);"
                  +"var target = element.ownerDocument.elementFromPoint(clientX, clientY);"
                  +"for (var e = target; e; e = e.parentElement) {"
                    +"if (e === element) {"
                  +"target.dispatchEvent(new MouseEvent('mouseover', {view: window, bubbles: true, cancelable: true, clientX: clientX, clientY: clientY}));"
                  +"target.dispatchEvent(new MouseEvent('mousemove', {view: window, bubbles: true, cancelable: true, clientX: clientX, clientY: clientY}));"
                  +"target.dispatchEvent(new WheelEvent('wheel',     {view: window, bubbles: true, cancelable: true, clientX: clientX, clientY: clientY, deltaY: deltaY}));"
                  +"return;"
                    +"}"
                  +"}";  
  
                WebElement parent = (WebElement) ((JavascriptExecutor) driver).executeScript("return arguments[0].parentNode;", element);
                ((JavascriptExecutor) driver).executeScript(script, parent, deltaY, offsetX, offsetY);
              }catch(WebDriverException e)
              {
              System.out.println("Exception caught in Catch block");
              }
      }
  
  }
  

• Console Output:

  Mouse wheel UP or Zoom In through Wheel achieved !!!
  Mouse wheel DOWN or Zoom Out through Wheel achieved !!!
  Mouse Scroll through Wheel achieved !!!
  

Reference

You can find a couple of relevant detailed discussion in:

• How to find the coordinates of the buttons on a canvas, and click on them after using Java and Selenium?

Try FEST framework. This is what was previously known as Abbot, if I'm not mistaken. I use this for automated testing and it seems to be very simple and convenient. Simple things are made easy and complex things are not a rocket science there. I considered UISpecj4j, but it didn't suite me, because there is no technical possibility to test Drag'n'Drop while it's a must. Besides it's quite difficult to develop tests when you don't actually see what's happening (UISpec4J uses fake, invisible look'n'feel)

The only thing is making troubles in FEST (also, by design) - it grabs a mouse and doesn't let you do anything while it running a test.

Instead of doing this:

getDriver().findElement(By.xpath("//span[text()='"+auctionID+"']"));

I would try something like this:

By auctionList = By.xpath(".//span[contains(@id,'listOfAuctions')]"));
By containsTextWithId = By.xpath(".//span[contains(.,'" + id + "')]"));
By combinedLocator = new ByChained(auctionList, containsTextWithId);

Or some similar idea, depending on what you are doing.

I ran into a similar issue. The click method worked on other pages, then didn't work at all on a particular page.

A race condition caused the issue:

1. HTML content is rendered with the button disabled.
2. The selenium web driver script was executed before the javascript onload event was triggered (Or finished executing). So the button.click would occur on a disabled element. And nothing would happen.
3. Then the javascript onload event would trigger (or finish executing) and the javascript would enable the button.
4. I looked at the page and couldn't figure out why my code wasn't working because the button appeared to be enabled upon inspection, and if I manually clicked the button, it worked.

Once I figured out that it was a timing issue, I found the solution here: How can I get Selenium Web Driver to wait for an element to be accessible, not just present?

To paraphrase the solution in Ruby:

//This will not return the button until it is enabled.
button = driver.find_element(:xpath,  "//button[@id='myButtonId' and not(@disabled)]")
button.click