In this article, we will learn how to display a warning message before leaving the web page with unsaved changes using javascript with the help of the “beforeunload” event listener. When working on web applications or forms of any kind, it becomes necessary to provide a warning message to users before they leave a page with unsaved changes. This can prevent accidental data loss and improve the overall user experience. Let’s understand how we can implement this with the help of some examples − Example 1 In this example, we will have a form with multiple input elements and ... Read More

In this article, we will learn how to display errors inline on a page and without an alert box using javascript with the help of innerHTML and textContent properties of HTML DOM elements. While alert boxes can be useful for displaying errors to users, they can be disruptive and interrupt the user experience. A more elegant solution is to display errors inline on the page. Let’s understand how to achieve the above result with the help of 2 approaches Approach 1 In this approach, we will use the innerHTML DOM element property to display the error message inline in ... Read More

In this article, we will learn how to disable button HTML elements dynamically using javascript, with the help of the “disabled” attribute. The “disabled” attribute in HTML button elements accepts a boolean value (true or false), and depending on the value, it disables the button and makes it non-functional, i.e., not clickable. We can use this attribute to disable any button in HTML by setting the “disabled” attribute to “true”. Syntax Disabled Button Let’s understand this with the help of some examples − Example 1 In this example, we will disable a button element by passing the “disabled” attribute ... Read More

Are you also willing to add a custom audio recording feature to your web application? If yes, you are in the right place, as we will learn to record and play audio using JavaScript in this tutorial. Some applications like Discord allow you to record the audio and store it inside that to play it anytime. The recorded audio can also be used as a meme for fun, alerts in the discord meetings, etc. We can also use the mediaRecorder API of JavaScript to add the recording audio feature to our web application. Here, we will learn a step-by-step guide ... Read More

JavaScript allows developers to add functionality and behaviors to the web page. Developers require to create multiple functions and variables to add functionality to different parts of the web page. While developing real-time applications, multiple developers work on the same project. So, avoiding the unintentional overriding of functions and variables while collaborating with multiple developers is necessary. In this tutorial, we will learn to prevent overriding using immediately invoked function expressions. Problem of Overriding For example, two colleagues are working on the same project, and both have defined the printAge() function inside the code and merged the code. Now, the ... Read More

As web applications become more complex and demanding, the need for efficient and responsive processing becomes increasingly important. JavaScript, being a single-threaded language, can sometimes struggle with heavy computational tasks that may result in slow user interfaces and unresponsive applications. However, with the introduction of Web Workers, JavaScript gains the ability to leverage multithreading, allowing for improved performance and enhanced user experiences. In this article, we will delve into the world of Web Workers and explore how they enable multithreading in JavaScript. Understanding the Need for Web Workers In traditional JavaScript, the single-threaded nature means that all tasks, including DOM ... Read More

Web components are a powerful tool for building reusable and encapsulated UI elements in web applications. They allow developers to create custom elements with their own markup, style, and behavior, which can be easily reused across different projects and shared with other developers. In this article, we will explore the fundamentals of web components and learn how to build custom elements using JavaScript. What are Web Components? Web components are a set of web platform APIs that allow you to create reusable, encapsulated, and composable UI elements. They consist of three main specifications: Custom Elements, Shadow DOM, and HTML Templates. ... Read More

Have you ever wondered if it's possible to run high-performance applications on the web without sacrificing the portability and security that JavaScript provides? Well, wonder no more! With the introduction of WebAssembly (Wasm), it is now possible to bring native-like performance to web applications while still leveraging the power of JavaScript. In this article, we will explore the basics of WebAssembly and how it can be used alongside JavaScript to unlock a new world of possibilities. What is WebAssembly (Wasm)? WebAssembly, often referred to as Wasm, is a binary instruction format designed specifically for web browsers. It is a low-level ... Read More

JavaScript is a popular programming language known for its flexibility and dynamic nature. However, this flexibility can sometimes lead to unexpected errors and bugs in large-scale applications. To address this issue, TypeScript was introduced as a superset of JavaScript that provides static type checking capabilities. In this article, we will explore the basics of static type checking in JavaScript using TypeScript, along with code examples and explanations to help you get started. What is Static Type Checking? Static type checking is a process where types are associated with variables, function parameters, and function return values at compile-time, rather than at ... Read More

In the world of web development, delivering a fast and seamless user experience is crucial. One way to achieve this is through Server-Side Rendering (SSR), a technique that allows rendering web pages on the server before sending them to the client. SSR offers numerous benefits, including improved performance, SEO optimization, and better user interaction. In this article, we will explore the fundamentals of SSR using Next.js, a popular JavaScript framework for building server-rendered React applications. What is Server-Side Rendering (SSR)? Traditionally, web applications have relied on client-side rendering, where the entire rendering process occurs on the browser using JavaScript. This ... Read More