20 Selenium JavaScript Interview Questions and Answers

Selenium is a popular open source testing tool that is used to automate web browsers. If you are applying for a position that involves testing web applications, you may be asked questions about Selenium during your interview. Answering these questions confidently can help you land the job. In this article, we review some of the most common Selenium JavaScript questions and provide tips on how to answer them.

Selenium JavaScript Interview Questions and Answers

Here are 20 commonly asked Selenium JavaScript interview questions and answers to prepare you for your interview:

1. What is Selenium JavaScript?

Selenium JavaScript is a tool used for automated testing of web applications. It is based on the JavaScript programming language and allows developers to write tests that can simulate user interactions with a web application. Selenium JavaScript can be used to test both the front-end and back-end of a web application.

2. Can you explain what happens in the background when running a Selenese command with Javascript?

When a Selenese command is run with Javascript, the Javascript code is first converted into a format that the Selenium server can understand. This conversion process is known as “marshalling.” Once the code has been marshalled, it is then sent to the Selenium server where it is executed.

3. Can you give me some examples of commands that can be used to run Selenese commands written in Javascript?

There are a few different ways to run Selenese commands written in Javascript. One way is to use the “run” function, which will execute the Selenese command immediately. Another way is to use the “schedule” function, which will schedule the Selenese command to be executed at a later time. Finally, you can use the “execute” function, which will execute the Selenese command asynchronously.

4. How do you create a browser instance using Javascript and the Selenium object?

You can create a new browser instance by using the Selenium.BrowserFactory.createBrowser() method. This will return a new Browser instance that can be used to navigate to websites and perform actions.

5. How do you open a URL in javascript and selenium?

You can open a URL in javascript by using the window.open() method. In selenium, you can open a URL by using the get() method.

6. How can you maximize the window size using Javascript and Selenium?

You can use the Javascript command “window.maximize()” to maximize the window size.

7. How can you set the width and height of the browser using Javascript and Selenium?

You can set the width and height of the browser using Javascript and Selenium by setting the “window.resizeTo” function.

8. How would you check if an element exists on the page, using Javascript and Selenium?

You can use the JavascriptExecutor to check if an element exists on the page. You would need to pass in a script that returns true or false depending on whether or not the element exists.

9. How can you get all hyperlinks present on a page using Javascript and Selenium?

You can use the Javascript command “document.getElementsByTagName(‘a’)” to get all hyperlinks present on a page.

10. How can you retrieve text from an HTML table using Javascript and Selenium?

You can use the Javascript function “getElementsByTagName” to find all of the table elements in the HTML document. Once you have a list of all the table elements, you can loop through them and extract the text from each one.

11. How can you fetch radio-button values from a web page using Javascript and Selenium?

You can use the following code to fetch radio-button values from a web page using Javascript and Selenium:

var radios = document.getElementsByName(‘group1’);

for (var i = 0, length = radios.length; i < length; i++) {
if (radios[i].checked) {
// do something with radios[i]
}
}

12. If a website contains multiple frames, how can we switch between them using Javascript and Selenium?

In order to switch between frames using Javascript and Selenium, you will need to use the switchTo() method. This method takes as its argument the name or id of the frame that you wish to switch to. For example, if you have a frame with the id “main” and you wish to switch to it, you would use the following code:

driver.switchTo().frame(“main”);

13. What are the different ways to select a value from a dropdown list in Javascript and Selenium?

There are a few different ways to select a value from a dropdown list in Javascript and Selenium. One way is to use the selectByVisibleText() method, which will select an option based on the text that is visible to the user. Another way is to use the selectByIndex() method, which will select an option based on its position in the dropdown list. Finally, you can also use the selectByValue() method, which will select an option based on the value attribute of that option.

14. How can you verify whether an element is visible or not, using Javascript and Selenium?

You can use Javascript to check whether an element is visible or not by using the Selenium JavascriptExecutor. This will allow you to execute Javascript code in order to check the visibility of an element.

15. Is it possible to read data from an Excel sheet in Javascript and Selenium? If yes, then how?

Yes, it is possible to read data from an Excel sheet in Javascript and Selenium. One way to do this would be to use the Apache POI library to read in the data from the Excel sheet.

16. How would you scroll down to view an element in a webpage using Javascript and Selenium?

You can use the JavascriptExecutor to scroll down to an element in a webpage. You would need to find the element’s x and y coordinates and then use the JavascriptExecutor to scroll to that location.

17. How would you find out the number of links present in a webpage using Javascript and Selenium?

The number of links present in a webpage can be found out using Javascript and Selenium by using the “getElementsByTagName” method. This method returns a list of all elements with the specified tag name, in this case “a”. The length of this list is equal to the number of links present in the webpage.

18. How would you inspect an element in a webpage using Javascript and Selenium?

The first step would be to locate the element on the webpage that you wish to inspect. This can be done using various methods such as XPath or CSS selectors. Once the element has been located, you can then use the Selenium .getAttribute() method to retrieve the desired information about the element.

19. How can you simulate pressing the ENTER key on a textbox in Javascript and Selenium?

You can use the Selenium.simulate method to simulate pressing the ENTER key on a textbox in Javascript and Selenium.

20. How can you record a test case using Javascript and Selenium?

You can use the Selenium IDE to record a test case using Javascript and Selenium.