HTML Cache Manifest - Block Refresh with 404 Result for Manifest

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cache

HTML5

Hi,

I've got a website which uses a cache manifest so it can work offline. I've recently had a problem where I've switched the live site to a holding page. This switches any requests for the cache manifest to return a http 404.

In this instance the whole page tried to update and ended up killing the application resulting in the main page reloading with again another 404 result.

The client device is an iPad.

The following is my code:

/// Start Cache Manifest

swapCM = function (e) {
    try { window.applicationCache.swapCache(); } catch (ex) { }
    $('divLoadingText').innerHTML = 'Loading new application version...'
    setTimeout(window.location.reload, 2000);
};

window.addEventListener('load', function (e) {

    $('divLoadingText').innerHTML = 'Checking current application version...'

    window.applicationCache.addEventListener('updateready', swapCM, false);

    if (window.applicationCache.status != window.applicationCache.UPDATEREADY) {
    }

    window.applicationCache.update();

}, false);

Does anyone know how this can be modified to check for none http 200 results and to ignore the refresh when this happens?