Ways to determine if a browser is currently loading a fresh webpage

I'm experiencing an issue with my web app where the 'safety' code triggers a page reload if the server (Socket.IO) connection becomes silent for more than 5 seconds, often due to customer site firewall or broken-proxy issues.

Although the Socket.IO connection stops when a new page begins loading, the safety code doesn't recognize this change. This results in navigating to a slow-loading page causing the safety code to activate and redirect back to the previous page.

I am looking for a solution to determine if the browser is waiting for a new (slow) page to load right before the safety code initiates a reload. Are there any methods other than attaching a jQuery click event to each link (which wouldn't capture navigation via the address bar)?

Thank you,

Chris.

javascriptwebpage-lifecycle

Answer №1

If you want to track when a user is about to leave a page, you can use the window.onbeforeunload event. This event fires right after the user starts navigating away from the current page.

To test this functionality, open the Chrome Console on any webpage and paste the following code. Then click on any link:

window.onbeforeunload = function () { console.log("Don't go!"); }

Answer №2

Here's a suggestion: update your code so that the page doesn't need to be reloaded when the socket disconnects. Problem solved.

Revision
One way to approach this is by creating a variable like isReloading whenever the page reloads. Keep an eye on the onbeforeunload event as well, and determine which occurs first: disconnection or the unload event. If disconnection happens first, set the isReloading flag and initiate a reload. When in the onbeforeunload, check if the flag was activated. Instead of checking for slow page loading, focus on whether a reload is happening.

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