Has anyone else encountered the issue of a javascript on a page continuing to run even after the page is refreshed? From what I understand, javascript is single-threaded and should stop running when the page is refreshed.
Just to provide some background, I was working on implementing comet for a website. The previous request for long-polling kept sending data to the server even after I refreshed the page.
Navigation consists of two main stages, whether triggered by a link click or a page refresh.
During the initial stage of navigation, the current page does not immediately terminate. The onbeforeunload event is triggered, allowing JavaScript to continue executing normally, which includes sending AJAX requests. The browser sends an HTTP request for the new page URL and waits for a response.
Depending on the server's response, the old page may continue running if a 204 Not Modified status code is received. There may also be redirects involved, further delaying the loading process. It may take some time before the browser receives enough of the new HTML page to begin rendering it.
Only after this stage, the onunload event is fired, terminating the previous page, aborting any ongoing AJAX requests, and displaying the new page. At this point, any scripts from the previous page will no longer be running.
Refreshing the page triggers a complete reload of all elements including HTML, JavaScript, CSS, and more. Thus, it is not possible to maintain any running processes when a page is refreshed.
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