One way to pass a variable from one HTML page to another using JavaScript is to use the browser’s localStorage object. localStorage provides a way to store key-value pairs in the user’s web browser, so that they persist across different pages and sessions. Here’s an example of how you could use localStorage to pass a …
How to Pass a Variable from HTML Page to Another (w/ JavaScript) Read More »
To get selected text from a textbox using JavaScript, you can use the following JavaScript code: You can try the above code solution by highlighting some text from the textbox below and clicking the button. Then whatever you highlight will appear in the alert box that pops up when you click the button. Highlight this …
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To select all div text with a single mouse click in JavaScript, you can use the following code: HTML: JavaScript: Here’s what the JavaScript function does step-by-step: Update: Because Internet Explorer is no longer in use, you might just want to remove the if-else function and use the code inside the else block. Test the …
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To calculate the age from birthdate in JavaScript, you can use this function: Here’s an example use of this function (called on 10th Feb 2023): Output: I hope this quick answer helps. If you have trouble understanding how this code works and what exceptions there are in calculating age (leap years), please read along. Problems …
The Short Answer There are several ways to check if a JavaScript string contains a substring. Here’s a short summary of the most notable ones. 1. string.indexOf() Use the indexOf() method. This method returns the index of the first occurrence of the substring in the string, or -1 if the substring is not found. For …
4 Ways to Check If a String Contains a Substring in JavaScript Read More »
The easiest way to remove a property from an object in JavaScript is by using the delete operator. For example, if you have an object called person with a property age, you can remove the age like this: After you run this code, the person object will no longer have an age property. Note that …
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To find (and not delete) duplicates in a JavaScript array, you can use this function: Example use: Output: To learn how the above approach works, and what alternatives exist, please keep on reading. This guide shows you ways to find array duplicates and show them instead of deleting them. Besides, you will learn what performance …
JavaScript How to Find Duplicates in Array (without Removing) Read More »
The easiest way to check if a JavaScript object is empty is by using the Object.keys to check the length of properties to see if it’s 0. This guide teaches you 5 ways to check if a JavaScript object is empty. Although it only takes one, this is a great chance to learn more about …
To log colored text to the JavaScript console, call the console.log method and include special formatting code %c to colorize the log and pass the colorizing CSS code as the second argument. For example, to log text in red, you can use the %c formatting code, followed by the desired text and a CSS color …
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An array is one of the key data types in JavaScript. It allows you to store values in a common place where it’s easy to access the values. This is a comprehensive guide to looping through arrays in JavaScript. You will learn multiple different and useful ways in which you can iterate over arrays. Which …
7 Ways to Loop Through an Array in JavaScript (+ One to Avoid) Read More »
