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Web Development Articles
Page 282 of 801
How to pause and play a loop using event listeners in JavaScript?
In this article, we'll learn how to pause and resume a JavaScript loop using event listeners and promises. This technique is useful for creating controllable animations, counters, or any iterative process that needs user interaction. An event listener attaches an event handler to an element, allowing us to respond to user interactions like button clicks. Syntax element.addEventListener(event, function, useCapture); Parameters event − The name of the event (e.g., "click") function − The function to execute when the event occurs useCapture ...
Read MoreHow to return true if the bottom of the page is visible using JavaScript?
In this tutorial, we will check if the bottom part of a page is visible or not to the user. We can do this functionality by using the height of the window and the height of the scrolled window. To write this code we need to understand three methods of JavaScript which are given as: scrollY − It is the read-only property of the window, and returns the pixels a document has scrolled vertically. window.scrollY scrollHeight − It is an HTML DOM element and a read-only property of the window. It returns the height of ...
Read MoreHow to check if the constructor of an object is a JavaScript Object?
In this article, we will check whether the constructor of an object is a JavaScript Object. The constructor property of any JavaScript variable returns a reference to the Object constructor function that created the instance object. The value of this property is a reference to the function itself. All objects have the constructor property, and objects created without an explicit constructor function will have a constructor property that points to the fundamental Object constructor type for that object. To check whether the constructor of a provided value is an Object created by the object constructor function, we need ...
Read MoreHow to check two numbers are approximately equal in JavaScript?
In JavaScript, determining if two floating-point numbers are "approximately equal" is essential because of precision issues with decimal calculations. We compare the absolute difference between two numbers against a tolerance value called epsilon. Why Use Approximate Equality? Floating-point arithmetic can produce unexpected results: console.log(0.1 + 0.2); // 0.30000000000000004 console.log(0.1 + 0.2 === 0.3); // false 0.30000000000000004 false The Algorithm We calculate the absolute difference between two numbers and compare it with epsilon (tolerance). If the difference is less ...
Read MoreHow to create HTML list from JavaScript array?
In this tutorial, we will explore multiple ways to create an HTML list from a JavaScript array. While you can manually create HTML lists using ul (unordered list) and li (list item) tags, this becomes impractical when dealing with dynamic data or large arrays. JavaScript provides efficient methods to dynamically generate HTML lists from array data. Let's examine three different approaches to accomplish this task. Method 1: Using the for Loop The simplest approach uses a traditional for loop to iterate through the array and create list items dynamically using createElement() and appendChild(). ...
Read MoreHow to swap two array elements in JavaScript?
In this tutorial, we explore different approaches to swap two array elements in JavaScript. For example, we can swap the first and second elements of an array: Input: ["first", "second", "third", "fourth", "fifth"] Output: ["second", "first", "third", "fourth", "fifth"] Here we swapped "first" and "second" values of the array. We will explore three different methods to swap array elements: Using a temporary variable Using Array Destructuring (ES6) Using Array splice() Method Using a Temporary Variable ...
Read MoreHow to Create an Analog Clock using HTML, CSS, and JavaScript?
In this tutorial, we will create a functional analog clock using HTML, CSS, and JavaScript. The clock will display the current time with three hands representing hours, minutes, and seconds that move in real-time. Approach Create the clock structure using HTML with three div elements for the hands Style the clock face and hands using CSS positioning and transforms Use JavaScript's Date object to get current time and calculate hand rotations Update the clock every second using setInterval() Understanding the Time Calculations ...
Read MoreHow to convert 3-digit color code to 6-digit color code using JavaScript?
In this tutorial, we will see how to convert 3-digit color code to 6-digit color code in JavaScript. A 3-digit hex color code represents colors in #RGB format, where each digit controls red, green, and blue values. To convert to 6-digit format, we duplicate each character: #RGB becomes #RRGGBB. For example: 3-digit: #08c 6-digit: #0088cc 3-digit: #f4a 6-digit: #ff44aa Algorithm Step 1: Check if the input length is exactly 3 characters Step 2: Split the string into individual characters using split("") Step 3: Use map() to duplicate each character ...
Read MoreHow to change string to be displayed as a superscript using JavaScript?
In this tutorial, we will learn how to display strings as superscript using JavaScript and HTML. Superscript text appears raised above the normal text baseline, making it smaller and positioned at half-height. This is commonly used in mathematical formulas like A2, B3, or scientific notations like 105. Superscript is essential for writing mathematical expressions, chemical formulas (like H2O+), and footnote references in web content. Using HTML Tag The simplest way to create superscript text is using the HTML tag. Any text inside this tag will automatically display as superscript. Syntax 102 = ...
Read MoreHow to create a chessboard pattern with JavaScript and DOM?
Creating visual patterns with JavaScript and DOM manipulation is a great way to understand programming logic. In this tutorial, we'll create a classic chessboard pattern using JavaScript to dynamically generate alternating colored squares. Algorithm Overview The chessboard pattern relies on a simple mathematical principle: if the sum of row and column indices is even, the square is one color (black), otherwise it's another color (white). This creates the alternating pattern characteristic of a chessboard. Basic Implementation Here's how to create a chessboard pattern step by step: Create a container div for the chessboard Use ...
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