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I have a web app idea which will require AJAX requests to function. Its crucial that AJAX requests are running as long as the user is on the site.
My question is, if the user left the site up (my ajax requests will be running) for say 4/5 hours, will these AJAX requests still run, my concerns are screen dimming, screensavers, computer sleep states. Will all or none of these affect the performance of my web app?
Unfortunately, it’s very client dependent. For example, mobile devices may stop processing JS when going into a sleep state (e.g., to save battery life). However, on an image rotator application I wrote some time ago, which sent regular requests to the server to retrieve images (there was good reason not to cache them, I swear), accessed primarily by non-mobile clients, I observed that requests continued for hours, even days. While I can’t know if the client machine ever entered a sleep state, I’m pretty confident it did.
Long story short – I think you can’t be sure, but for some target audiences, you can be reasonably sure. I would recommend investigating your audience.