Was Galileo expecting to see so many stars? Theres also the readystatechange event that triggers when the state changes, so we can print all these states like this: The readystatechange event is an alternative mechanics of tracking the document loading state, it appeared long ago. Not that you actually require a library for this. Page speed can be described in either "page load time" (the time it takes to fully display the content on a specific page) or "time to first byte" (how long it takes for your browser to receive the first byte of information from the webserver). Easiest way to remove 3/16" drive rivets from a lower screen door hinge? When you have alot of javascript it comes over in one bulk file and then most of the time on-load and post-load events fire to fully bring in the content. +1 , this is 10x better than the onload event for the precise reasons you mention. How to react to a students panic attack in an oral exam? See how your page loads on different devices. Making statements based on opinion; back them up with references or personal experience. PTIJ Should we be afraid of Artificial Intelligence? Better than onload is to use a function of an existing framework, because onload does sometimes respond after all the resources (images and so on) are loaded and not only the page. Let's see both. Code A loading message can be displayed in two different ways. simple and easiest way from JS. Lets say we gather data about how the page is used: mouse clicks, scrolls, viewed page areas, and so on. The business benefits are equally energizing. . Why does my JavaScript code receive a "No 'Access-Control-Allow-Origin' header is present on the requested resource" error, while Postman does not? The lifecycle of an HTML page has three important events: Lets explore the details of these events. How to see the extensions loaded by PHP ? The test is designed to help make your site faster by identifying what about a webpage is fast, slow, too big, and so on. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. "Use jQuery! I would like to execute a JavaScript function after a web-page was refreshed (any way: F5 key, browser's refresh key, user re-enter same URL or any other method). How to increase the number of CPUs in my computer? version, and load the proper version of the web page based on the information. This can be used with the body element to execute a script after the webpage has completely loaded. How to put a responsive clear button inside HTML input text field ? Why are non-Western countries siding with China in the UN? To learn more, see our tips on writing great answers. Here's the snippet I use to check if the page is ready: // The basic check if( document. When dom is parsed it still may load and execute deferred scripts. If I put showFiltermenu() in the pageLoad function then it will show every time the page is loaded but I just want it display the first time. Software Quality Assurance & Testing Meta. Just write it if it doesn't exist. Making statements based on opinion; back them up with references or personal experience. So alert shows zero sizes. If dark matter was created in the early universe and its formation released energy, is there any evidence of that energy in the cmb? Javascript's OnLoad event for the body does what you want. As DOMContentLoaded waits for scripts, it now waits for styles before them as well. Fix it by implementing the hypothesis, eg. Heres a document with