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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to Sort object of objects by its key value JavaScript
Let's say, we have an object with keys as string literals and their values as objects as well like this − const companies = { 'landwaves ltd': {employees: 1200, worth: '1.2m', CEO: 'Rajiv Bansal'}, 'colin & co': {employees: 200, worth: '0.2m', CEO: 'Sukesh Maheshwari'}, 'motilal biscuits': {employees: 975, worth: '1m', CEO: 'Rahul Gupta'}, 'numbtree': {employees: 1500, worth: '1.5m', CEO: 'Jay Kumar'}, 'solace pvt ltd': {employees: 1800, worth: '1.65m', CEO: 'Arvind Sangal'}, 'ambicure': {employees: 170, worth: '0.1m', CEO: 'Preetam Chawla'}, ...
Read MoreHow to find out what character key is pressed in JavaScript?
To find out which character key is pressed in JavaScript, you can use various methods. The modern approach uses the key property, while legacy methods relied on keyCode. Modern Approach: Using event.key The key property directly returns the character that was pressed, making it the preferred method: Key Detection - Modern Method Type in the input field below: ...
Read MoreFrom a list of IDs with empty and non-empty values, retrieve specific ID records in JavaScript
When working with arrays of objects containing IDs, you often need to filter records based on specific ID values. JavaScript's filter() method provides an efficient way to retrieve all objects matching a particular ID, even when the array contains empty or null ID values. Sample Data Let's work with the following array that contains both valid and empty ID values: var details = [ {id: 101, name: "John", age: 21}, {id: 111, name: "David", age: 24}, {id: 1, name: "Mike", age: 22}, ...
Read MoreJavaScript - Find the smallest n digit number or greater
We are required to write a JavaScript function that takes in a number as the first argument, say n, and an array of numbers as the second argument. The function should return the smallest n digit number which is a multiple of all the elements specified in the array. If there exist no such n digit element then we should return the smallest such element. For example: If the array is: const arr = [12, 4, 5, 10, 9] For both n = 2 and n = 3, the output should be 180 Example Following ...
Read MoreWhat is the difference between void, eval, and the Function constructor in JavaScript?
JavaScript provides three distinct features for executing and manipulating code: void, eval(), and the Function constructor. Each serves different purposes and has unique characteristics. The void Operator The void operator evaluates an expression and always returns undefined. It's commonly used to prevent unwanted return values or create undefined values explicitly. Syntax void expression void(expression) Example // Basic void usage console.log(void 0); ...
Read MoreHow to get the value of the id attribute a link in JavaScript?
In this tutorial, we will learn how to get the value of the id attribute of a link in JavaScript. The id attribute stores a unique value for an HTML element. The id of an element must be unique, and no other elements should have the same id. The id attribute of a link can be retrieved in different ways, and in this tutorial, we will discuss the most popular methods: Using document.getElementById() method Using document.getElementsByTagName() method Using document.querySelectorAll() method Using document.getElementById() Method The ...
Read MoreHow to add many Event Handlers to the same element with JavaScript HTML DOM?
When building interactive web applications, you often need to handle multiple events on the same element. For example, a button might respond to both clicks and hover events. JavaScript provides several approaches to attach multiple event listeners to a single DOM element efficiently. Using Multiple addEventListener Methods Using Array.forEach() for Event Registration Using Multiple addEventListener Methods The addEventListener method is the standard way to attach event handlers in JavaScript. You can call it multiple times on the same element to register different event types, each with their ...
Read MoreHow to display HTML5 client-side validation error bubbles?
HTML5 provides built-in client-side validation with error bubbles that appear when users try to submit invalid form data. The required attribute and input types like email automatically trigger these validation messages. Basic Required Field Validation The required attribute prevents form submission if the field is empty and displays a validation bubble: HTML5 Validation Enter Email: ...
Read MoreChange the color of the left border with CSS
The border-left-color property in CSS allows you to change the color of an element's left border independently from other borders. This property is useful when you want to create visual emphasis or design accents on specific sides of an element. Syntax border-left-color: color-value; Parameters The property accepts various color values: Color names: red, blue, green, etc. Hex values: #FF0000, #00FF00, etc. RGB values: rgb(255, 0, 0) HSL values: hsl(0, 100%, 50%) Example p.demo { ...
Read MoreOrder an array of words based on another array of words JavaScript
When working with arrays in JavaScript, you may need to reorder an array of objects based on the order specified in another array. This is useful for sorting data according to custom priorities or sequences. Let's say we have an array of objects sorted by their id property: const unordered = [{ id: 1, string: 'sometimes' }, { id: 2, string: 'be' }, { id: 3, string: 'can' }, { ...
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