Coding Help Tips Resources Tutorials
Google Apps Scripts and Web Development Tutorials and Resources by Laurence Svekis
Laurence Svekis 
In JavaScript, you can make an HTTP request using the XMLHttpRequest object or the newer fetch() function. Here’s an example of how to make an HTTP GET request using both methods: Using XMLHttpRequest: var xhr = new XMLHttpRequest(); xhr.open(“GET”, “https://api.example.com/data”, true); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var … Read more
The given code consists of two functions: FACTORIALVAL and test1. Let’s break down each function and its purpose: FACTORIALVAL(val): This function calculates the factorial value of a given number val. It first checks if the val is equal to 0. If it is, the function immediately returns 1. This is the base case of the … Read more
Google Sheet Formulas Formula to calculate the average of the values in a given rangeConcatenate two strings and capitalize the first letterCalculate the factorial of a given numberCount the number of occurrences of a given value in a rangeCalculate the distance between two sets of latitude and longitude coordinatesCheck if a given string is a … Read more
The code defines a function called DISTANCE_BETWEEN that calculates the distance between two geographical coordinates on the Earth’s surface using the Haversine formula. Here’s a step-by-step breakdown of the code: Define a constant earthRadius with a value of 6371, representing the Earth’s radius in kilometers. Calculate the difference in latitude (dLat) and longitude (dLon) between … Read more
In JavaScript, when an HTML element has an id attribute defined, it automatically becomes available as a global variable in the DOM (Document Object Model). This means you can directly access that element using its id as a variable without the need for any explicit lookups or queries. For example, if you have an HTML … Read more
AJAX examples The provided code handles the submission of a form and makes an asynchronous request to a specified URL using different AJAX techniques (jQuery, Axios, Fetch, and plain JavaScript). It also displays the response received from the server. document.addEventListener(“DOMContentLoaded”, function(event) { document.querySelector(‘input[name=”sender”]’).addEventListener(‘click’, makeRequest); }); var method = document.getElementById(‘method’); method.addEventListener(‘change’, function() { var myForm = … Read more
You can use the FormData API in JavaScript. Here’s an example of how you can serialize form data: function serializeFormData(form) { var formData = new FormData(form); var serializedData = {}; for (var [name, value] of formData) { if (serializedData[name]) { if (!Array.isArray(serializedData[name])) { serializedData[name] = [serializedData[name]]; } serializedData[name].push(value); } else { serializedData[name] = value; } … Read more
NodeJS Callback explained with Code Snippet Examples In Node.js, callbacks are a common pattern used to handle asynchronous operations. A callback is a function that is passed as an argument to another function and gets invoked once the asynchronous operation completes or encounters an error. Let’s dive into a detailed explanation with a coding example: … Read more
How to Install NodeJS and set up a text editor Congratulations! You have installed Node.js and set up a text editor for Node.js development. You can now create and run Node.js applications using your preferred text editor.
The event loop is a crucial component of Node.js that allows it to handle asynchronous operations efficiently. Let me explain how it works. In Node.js, the event loop is a mechanism that enables non-blocking I/O operations, such as reading from a file, making network requests, or querying databases, without blocking the execution of other code. … Read more