How to use executeCdpCommand method of org.openqa.selenium.chromium.ChromiumDriver class

There is a class designed for this in the bindigs.

You are looking for the Select class:

https://code.google.com/p/selenium/source/browse/java/client/src/org/openqa/selenium/support/ui/Select.java

You would need to 'find' the actual select element, not the individual options. Find that select element, and let Selenium & the Select class do the rest of the work for you.

You'd be looking for something like (s being the actual select element):

WebElement selectElement = driver.findElement(By.id("s");
Select select = new Select(selectElement);

The Select class has a handy getOptions() method. This will do exactly what you think it does.

List<WebElement> allOptions = select.getOptions();

Now you can do what you want with allOptions.

Please read this Martin Follower's article - Page Object.

A quotation:

Despite the term "page" object, these objects shouldn't usually be built for each page, but rather for the significant elements on a page

Imagine a page which has over of dozen tabs, panels etc, and each one have a few fields, buttons etc. It would be impractical to create a huge class for such a page, it would certainly have 300-500 or more lines of code. Such a class would be very hard to maintain.

It's better (in my opinion) to create several small classes (page objects), each for a specific section of the page, each one containing only a few elements, each no more than 50-100 lines of code. We call these classes page fragments instead of page objects, but the concept is the same.

But it will vary from person to person and everyone may have a different opinion on this topic.

Yes FirefoxDriver(desiredCapabilities) is deprecated.

Alternate way would be to go with options:

FirefoxOptions foptions =  new FirefoxOptions(capabilities);
WebDriver driver=new FirefoxDriver(foptions);  

Update : [In order]

FirefoxOptions foptions =  new FirefoxOptions();
FirefoxProfile firefoxProfile = new FirefoxProfile(pathToProfile);
foptions.setProfile(firefoxProfile);
foptions.setCapability("marionette", false);
foptions.setBinary("C:\\Program Files\\Mozilla Firefox 52\\firefox.exe"); 
WebDriver driver = new FirefoxDriver(foptions);

Well, there are two types of wait: explicit and implicit wait. The idea of explicit wait is

WebDriverWait.until(condition-that-finds-the-element);

The concept of implicit wait is

driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

You can get difference in details here.

In such situations I'd prefer using explicit wait (fluentWait in particular):

public WebElement fluentWait(final By locator) {
    Wait<WebDriver> wait = new FluentWait<WebDriver>(driver)
            .withTimeout(30, 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(locator);
        }
    });

    return  foo;
};

fluentWait function returns your found web element. From the documentation on fluentWait: An implementation of the Wait interface that may have its timeout and polling interval configured on the fly. Each FluentWait instance defines the maximum amount of time to wait for a condition, as well as the frequency with which to check the condition. Furthermore, the user may configure the wait to ignore specific types of exceptions whilst waiting, such as NoSuchElementExceptions when searching for an element on the page. Details you can get here

Usage of fluentWait in your case be the following:

WebElement textbox = fluentWait(By.id("textbox"));

This approach IMHO better as you do not know exactly how much time to wait and in polling interval you can set arbitrary timevalue which element presence will be verified through . Regards.

Scenario/Test steps:
1. Open a browser and navigate to TestURL
2. Scroll down some pixel and scroll up

For Scroll down:

WebDriver driver = new FirefoxDriver();
JavascriptExecutor jse = (JavascriptExecutor)driver;
jse.executeScript("window.scrollBy(0,250)");

OR, you can do as follows:

jse.executeScript("scroll(0, 250);");

For Scroll up:

jse.executeScript("window.scrollBy(0,-250)");
OR,
jse.executeScript("scroll(0, -250);");

Scroll to the bottom of the page:

Scenario/Test steps:
1. Open a browser and navigate to TestURL
2. Scroll to the bottom of the page

Way 1: By using JavaScriptExecutor

jse.executeScript("window.scrollTo(0, document.body.scrollHeight)");

Way 2: By pressing ctrl+end

driver.findElement(By.cssSelector("body")).sendKeys(Keys.CONTROL, Keys.END);

Way 3: By using Java Robot class

Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_END);
robot.keyRelease(KeyEvent.VK_END);
robot.keyRelease(KeyEvent.VK_CONTROL);

You can use JavaScriptExecutor for scrolling.

Scroll Down

((JavascriptExecutor)driver).executeScript("window.scrollTo(0,document.body.scr‌​ollHeight);");

Scroll Up

((JavascriptExecutor)driver).executeScript("window.scrollTo(0,0);");

Even though I'm somewhat late answering the question:

You can now use WebElement.isDisplayed() to check if an element is visible.

Note:

There are many reasons why an element could be invisible. Selenium tries cover most of them, but there are edge cases where it does not work as expected.

For example, isDisplayed() does return false if an element has display: none or opacity: 0, but at least in my test, it does not reliably detect if an element is covered by another due to CSS positioning.

I found the work around as below

1. Open terminal
2. Navigate to path where your chromedriver file is located
3. Execute any one of the below commands

Command1: xattr -d com.apple.quarantine <name-of-executable>

Example

/usr/local/Caskroom/chromedriver 
$ xattr -d com.apple.quarantine chromedriver 

(or)

Command2: spctl --add --label 'Approved' <name-of-executable>

Source: https://docwhat.org/upgrading-to-catalina

Note: This will work only with the file(s) where the above command is executed. If a new chromedriver is downloaded then the command has to be executed again on the newly downloaded file

You have to give your chromeDriver.exe file path instead of taking the path from the URL.

example:

 System.setProperty("webdriver.chrome.driver",
            "C:\\Downloads\\chromedriver.exe");