Asynchronous Function In JavaScriptĪsynchronous code does not wait for I/O operations to complete. Now we don’t want that! Do we? This is where asynchronous JavaScript comes into the picture. In addition, it can create a “freezing” effect on the screen, equating to an unresponsive user experience. When performing long operations such as database requests, the main thread will be blocked when the server processes the request, and the program execution will be halted. However, when it comes to performance, synchronous code can make a programmer’s life difficult. It is easier and simpler to write code synchronously as we don’t have to worry about concurrency issues. Synchronous code is also called “blocking” because it blocks code execution until all the resources are available. Throws error as we cannot call 'message' before initialization By the end of this tutorial, you will be able to use the JavaScript wait function in your Selenium WebDriver tests. Preceding that, we will also discuss the synchronous and asynchronous nature of JavaScript. This Selenium JavaScript tutorial will dive deep into the Async and Await in JavaScript, followed by practical examples.
Starting your journey with Selenium WebDriver? Check out what WebDriver is, its features, how it works, best practices, and more in this WebDriver tutorial. In the meantime, if you’d like to run your JavaScript test scripts over a Selenium Grid online then leverage LambdaTest for your test automation.👇 For example, you can use the combination of Async/Await, setTimeout(), and Promises to implement the JavaScript wait function that will work as you would expect it should. Hence, we need to use alternatives for realizing JavaScript wait. Selenium supported languages like Java support different waits in Selenium, but JavaScript does not have that native function for inserting waits in the code. Selenium has bindings for a wide range of programming languages which includes JavaScript. However, using Sleep is not considered a good Selenium testing best practice, due to which QA engineers use other forms of wait in the source code. When performing Selenium, the Sleep function will cause the execution of your code to halt for a specified number of seconds. There are many options when it comes to putting your program to sleep (or insert delays in the program). For more in-depth resources, check out our content hub on Selenium JavaScript Tutorial. In JavaScript, we can wait 5 seconds before executing a function or some code with the use of the setTimeout method.This article is a part of our Content Hub.
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