lazy load the big library. Then, on page load, the web page retrieves those cookies and checks the current time. How should I integrate this with the browser? If it exists, you know it isn't the first time. For more details visit W3Schools - document.readystate. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam. Use that to determine if the page loaded correctly. You can detect when a page has loaded by using the window.onload () event. Or just whenever a page gets requested the first time (which can be checked with Page.IsPostBack). For instance, if the page has a form with login and password, and the browser remembered the values, then on DOMContentLoaded it may try to autofill them (if approved by the user). "; True enough, but if you're in an extreme legacy browser environment (it wasn't my idea) then anything in PerformanceTiming is out of reach. Getting Started Introduction to Document Object Model Selecting Elements Select Element By Id Select Elements By Name Select Elements By Tag Name Select Elements By Class Names Select Element By CSS Selectors Travesing Elements Get the Parent Element Get Siblings of an Element Get Children of an Element Manipulating Elements Create Elements The onload event can be used to check the visitor's browser type and browser This now works to check if the page is loaded for the first time. keypress F5 from the user. Duress at instant speed in response to Counterspell. Nowadays, it is rarely used. What took days of technical work is now just a few clicks. ", because a lot of extension stores consider that privacy violation. . If it's just a standard load though, should work fine. Why did the Soviets not shoot down US spy satellites during the Cold War? Asking for help, clarification, or responding to other answers. Verify the element at the bottom right most corner has been shown. Why was the nose gear of Concorde located so far aft? 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. 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). If you need more times check out the window.performance object: Don't ever use the setInterval or setTimeout functions for time measuring! Open Visual Studio 2012 and click "File" -> "New" -> "Web Site.". 1 - Page Reloaded To subscribe to this RSS feed, copy and paste this URL into your RSS reader. setItem ( "first_time", "1" ); } They'll be far more accurate. The example below correctly shows image sizes, because window.onload waits for all images: When a visitor leaves the page, the unload event triggers on window. I think you may have posted something very similar to this before. How do I refresh a page using JavaScript? " Experiments are a game changer for quantifying the speed impact of performance optimizations. Anybody with an idea on how to do that? Would the reflected sun's radiation melt ice in LEO? Home JavaScript DOM JavaScript Page Load Events. Could very old employee stock options still be accessible and viable? Naturally, it has to wait for styles to load. Insert a Node before the first Child of an Element, Insert a Node after the last Child of an Element, insertBefore Insert a Node Before Another, insertAfter Insert a Node After Another, Remove Items from Select Element Conditionally, Removing Items from a Select Element Conditionally. ,