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iframe = document.createElement("IFRAME");
iframe.src = "about:blank";
document.body.appendChild(iframe);
iframe.contentWindow.document.body.textContent = "Nothing to see here.";
storageEventList = new Array();
iframe.contentWindow.onstorage = function(e) {
window.parent.storageEventList.push(e);
};
function runAfterNStorageEvents(callback, expectedNumEvents)
{
countStorageEvents(callback, expectedNumEvents, 0)
}
function countStorageEvents(callback, expectedNumEvents, times)
{
function onTimeout()
{
var currentCount = storageEventList.length;
if (currentCount == expectedNumEvents) {
callback();
} else if (currentCount > expectedNumEvents) {
msg = "got at least " + currentCount + ", expected only " + expectedNumEvents + " events";
callback(msg);
} else if (times > 50) {
msg = "Timeout: only got " + currentCount + ", expected " + expectedNumEvents + " events";
callback(msg);
} else {
countStorageEvents(callback, expectedNumEvents, times+1);
}
}
setTimeout(onTimeout, 20);
}
function clearStorage(storageName, callback)
{
if (window[storageName].length === 0) {
storageEventList = [];
setTimeout(callback, 0);
} else {
window[storageName].clear();
runAfterNStorageEvents(function() {
storageEventList = [];
callback();
}, 1);
}
}
function testStorages(testCallback)
{
testCallback("sessionStorage");
var hit = false;
add_result_callback(function() {
if (!hit) {
hit = true;
testCallback("localStorage");
}
});
}
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