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Javascript Articles
Page 510 of 534
How to encode a URL using JavaScript function?
As we know, a URL is a web address. What is URL encoding and why do we need to encode a URL? The process of turning a string into an accurate URL format is known as URL encoding. A valid URL format only uses "alpha | digit | safe | extra | escape" characters. Only a limited selection of the normal 128 ASCII characters is permitted in URLs. Reserved characters that are not part of this set must be encoded. URL encoding increases the reliability and security of URLs. Each character that needs to be URL-encoded is encoded ...
Read MoreHow to decode a URL using JavaScript function?
In this tutorial, we will learn how to decode a URL using JavaScript. URL is an abbreviation for Uniform Resource Locator. A URL is the address of a certain Web site. Each valid URL, in principle, links to a different resource. These resources include an HTML page, a CSS document, a picture, etc. URL encoding refers to replacing certain characters in a URL with one or more character triplets composed of the percent character "%" followed by two hexadecimal numbers. The triplet's two hexadecimal digits represent the numeric value of the replacement character. URL encoding's reverse process is ...
Read MoreHow to add a number of months to a date using JavaScript?
To add a number of months to a date in JavaScript, you can use the setMonth() method combined with getMonth(). This approach automatically handles year transitions and varying month lengths. Basic Syntax date.setMonth(date.getMonth() + numberOfMonths); Example: Adding Months to Current Date var currentDate = new Date(); var monthsToAdd = 3; document.write("Original Date: ...
Read MoreHow to parse JSON object in JavaScript?
JSON (JavaScript Object Notation) is a lightweight data format commonly used for data exchange. JavaScript provides the built-in JSON.parse() method to convert JSON strings into JavaScript objects. Syntax JSON.parse(text, reviver) Parameters text - The JSON string to parse reviver (optional) - A function that transforms the results Basic JSON Parsing Example // Simple JSON string let jsonString = '{"name": "John", "age": 30, "city": "New ...
Read MoreHow can I pass a parameter to a setTimeout() callback?
To pass a parameter to setTimeout() callback, you can use additional arguments after the delay parameter or use anonymous functions with closures. Syntax setTimeout(functionName, milliseconds, arg1, arg2, arg3...) The following are the parameters: functionName − The function to be executed. milliseconds − The delay in milliseconds. arg1, arg2, arg3 − Arguments passed to the function. Method 1: Using Additional Arguments Pass parameters directly as additional arguments to setTimeout(): Submit ...
Read MoreHow to compare Python DateTime with Javascript DateTime?
Both Python and JavaScript have unique ways of representing date and time data. To compare Python datetime objects with JavaScript Date objects, we must ensure that both are converted to a common format, such as ISO 8601 strings or Unix timestamps (milliseconds since epoch). The following are two major differences between Python datetime and JavaScript Date objects: Month Representation: JavaScript uses a 0-indexed month (0 for January, 11 for December), while Python uses a 1-indexed month (1 for January, 12 for December). Default Time Zone: Python defaults to UTC, ...
Read MoreWhat is the syntax for leading bang! in JavaScript function?
The leading bang (!) in JavaScript is used to immediately invoke anonymous functions. It converts the function declaration into a function expression, allowing immediate execution. Why Use Leading Bang? JavaScript requires function expressions (not declarations) to be immediately invoked. The ! operator forces the parser to treat the function as an expression. Syntax !function() { // code here }(); Example: Basic Usage !function() { console.log("Immediately invoked with bang!"); }(); Immediately invoked with bang! Alternative Operators Besides !, ...
Read MoreHow to determine if an argument is sent to the JavaScript function?
To determine if an argument is sent to a JavaScript function, you can use several approaches including default parameters, checking for undefined, or using the arguments object. Using Default Parameters Default parameters provide fallback values when arguments are not passed or are undefined: function display(arg1 = 'Tutorials', arg2 = 'Learning') { document.write(arg1 + ' ' + arg2 + ""); } ...
Read MoreHow to call multiple JavaScript functions in onclick event?
To call multiple JavaScript functions in onclick event, you can separate them with semicolons. This allows you to execute several functions sequentially when a single click occurs. Syntax onclick="function1(); function2(); function3()" Method 1: Using Semicolons The simplest approach is to separate multiple function calls with semicolons directly in the onclick attribute: function Display1() { document.getElementById("output").innerHTML += "Hello there!"; } ...
Read MoreHow do I call a JavaScript function on page load?
This tutorial will teach us to call a JavaScript function on page load. In many cases, while programming with HTML and JavaScript, programmers need to call a function while loading the web page or after the web page load finishes. For example, programmers need to show the welcome message to the user on page load. There are various ways to call a function on page load or after page load in JavaScript, and we will look at them one by one in this tutorial. Using the onload event in the tag ...
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