Mark Steggles Mark Steggles - 7 months ago 758
Javascript Question

Prevent safari loading from cache when back button is clicked

Got an issue with safari loading old youtube videos when back button is clicked. I have tried adding onunload="" (mentioned here Preventing cache on back-button in Safari 5) to the body tag but it doesn't work in this case.

Is there any way to prevent safari loading from cache on a certain page?

Answer

Your problem is caused by back-forward cache. It is supposed to save complete state of page when user navigates away. When user navigates back with back button page can be loaded from cache very quickly. This is different from normal cache which only caches HTML code.

When page is loaded for bfcache onload event wont be triggered. Instead you can check the persisted property of the onpageshow event. It is set to false on initial page load. When page is loaded from bfcache it is set to true.

Kludgish solution is to force a reload when page is loaded from bfcache.

window.onpageshow = function(event) {
    if (event.persisted) {
        window.location.reload() 
    }
};

If you are using jQuery then do:

$(window).bind("pageshow", function(event) {
    if (event.originalEvent.persisted) {
        window.location.reload() 
    }
});
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