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Javascript Selenium Tutorial: Javascript Explained

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A programming language with the combined power of syntax, speed and scalability, JavaScript is acclaimed the world over as one of the most powerful languages used to develop dynamic web applications. JavaScript is syntax-based, object-oriented and highly versatile, allowing developers to quickly create web sites with interactive features, powerful web-based applications, and clean user interfaces. JavaScript has been used in tandem with Selenium, a web testing platform, to enhance and automate the entire testing process.

What is Javascript?

JavaScript (JS) is a programming language that enables developers to produce dynamic web pages by scripting client-side usage of HTML, CSS, and other web technologies. It is lightweight, easy to learn, and provides cross-platform support for application development, including for mobile and desktop devices. As the leading language deployed in web browsers, JavaScript is used to develop responsive and interactive websites, games, and dynamic web applications such as chat programs. At its core, it’s a sophisticated and powerful language that allows developers to quickly create interactive web experiences with minimal effort.

JavaScript is also used to create server-side applications, such as web servers and databases. It is a versatile language that can be used to create a wide range of applications, from simple web pages to complex web applications. Additionally, JavaScript is used to create mobile applications, such as those for iOS and Android. With its wide range of capabilities, JavaScript is an essential language for any web developer.

Benefits of Using Javascript in Selenium

Using JavaScript and Selenium, developers can automate various web application testing tasks with ease. This combination gives users a greater control of their automation process and enhance their code workflow. The general benefits of using JavaScript in Selenium are-

  • Faster Development – Using JavaScript with Selenium enables developers to more quickly create automated tests, taking advantage of the (ECMAScript) 6 syntax.
  • More Reusable Code – Reusing the same code snippets when writing tests improves the efficiency of your automation process.
  • Flexibility – Customizability is one of the strongest points of JavaScript. It contains an extensive set of functions which enhances flexibility when working with Selenium.
  • Load Performance – Tests with JavaScript code might experience improved performance as code is executed on the client side rather than on the server side.
  • Debugging – Synchronous code execution makes it easier to debug your tests when using JavaScript.

In addition, JavaScript is a popular language and is widely used by developers, making it easier to find help and resources when working with Selenium. Furthermore, JavaScript is a lightweight language, making it easier to maintain and debug code.

Getting Started with Javascript in Selenium

To use JavaScript in your Selenium automation tasks, you need to first have a browser installed that supports the language. The most commonly used browsers for this purpose are Google Chrome and Mozilla Firefox. In addition, you’ll need to set up a text editor for writing code, such as Sublime Text or Visual Studio Code. Finally, you’ll need to install the Selenium WebDriver for your particular browser’s version.

Once you have all the necessary components installed, you can begin writing your JavaScript code. You can use the Selenium WebDriver to control the browser and execute the code. Additionally, you can use the Selenium IDE to record and playback your tests. This makes it easier to debug and troubleshoot any issues that may arise. With the right setup, you can quickly and easily create automated tests with JavaScript in Selenium.

Basic Syntax and Data Types in Javascript

JavaScript has a number of primitive data types that are used for data storage and manipulation. These include String, Number, Boolean, null, undefined, and Symbol. Variables are used in JavaScript to store data values and can be anything from numbers or strings to object references. The syntax for declaring variables uses the keyword ‘var’ or ‘let’ followed by a name for the variable that adheres to valid naming conventions.

In addition to the primitive data types, JavaScript also supports complex data types such as Arrays and Objects. Arrays are used to store multiple values in a single variable, while Objects are used to store multiple values in a structured way. JavaScript also supports functions, which are used to perform specific tasks and can be used to create reusable code.

Operators and Expressions in Javascript

Operators are special symbols or words used in your code to perform certain operations on data values such as comparison or assignment. The most commonly used operators in JavaScript include arithmetic operator (addition +, subtraction -), comparison operators (greater than >), logical operators (AND & OR ||), assignment operator (=), increment/decrement operators ( ++/– ), and ternary operators ( ?: ). In addition, expressions are sets of instructions used in JavaScript to evaluate a condition or perform an operation which can be used in combination with various operators.

Working with Variables & Functions in Javascript

In JavaScript, a function is a set of statements that perform a task or calculate a value when called. Variables in JavaScript are used to store data values and can be anything from numbers or strings to object references. Functions help developers finely tune their code and make it easier to reuse certain code snippets. They also allow developers to manipulate data sets without writing out large amounts of code.

Working with Objects in Javascript

Objects are collections of data related to a single entity – each object contains its own unique set of properties and methods. In JavaScript, data is stored as objects within objects which can be manipulated using specific commands or methods such as getter and setter functions. Objects are particularly useful when working with premium browsers like Chrome which support objects natively.

Debugging and Troubleshooting Tips for Javascript in Selenium

While debugging code with JavaScript can be daunting for beginners, there are some tips you can keep in mind which can help make the process more streamlined. First off, always use logging statements – these statements create log files within your browser’s console which can be used for reference when troubleshooting. It is also important to use proper breakpoints when debugging code; breakpoints tell your program where to stop execution so that you can examine variables within a certain scope at any given time. Lastly, debugging tools like Chrome DevTools can come in handy when tracking down errors in your code.

Best Practices for Writing Automation Scripts with Javascript & Selenium

When writing automation scripts with JavaScript and Selenium, there are certain best practices which should be applied to ensure scripts run efficiently and productively:

  • Format your code consistently and properly throughout the script.
  • Nest corresponding functions within larger parent functions.
  • Use descriptive variable names so they can be easily identified while debugging.
  • Perform type conversion prior to performing operations on existing data values.
  • Use functions only when necessary – if you are using functions within functions, try to limit this as much as possible.
  • Avoid using third-party libraries – using native methods are often preferred when writing automation scripts.
  • Keep logs during your scripts execution and review them after they complete running as they can help pinpoint potential errors or bugs.

By following these best practices when writing automation scripts with JavaScript and Selenium, you will be able to ensure that your code is stable and runs optimally within your desired browser environment.

Nisha Kumari

Nisha Kumari

Nisha Kumari, a Founding Engineer at Bito, brings a comprehensive background in software engineering, specializing in Java/J2EE, PHP, HTML, CSS, JavaScript, and web development. Her career highlights include significant roles at Accenture, where she led end-to-end project deliveries and application maintenance, and at PubMatic, where she honed her skills in online advertising and optimization. Nisha's expertise spans across SAP HANA development, project management, and technical specification, making her a versatile and skilled contributor to the tech industry.

Written by developers for developers

This article was handcrafted with by the Bito team.

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