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const syncDelay = ms => {
const start = performance.now();
let elapsedTime;
do {
elapsedTime = performance.now() - start;
} while (elapsedTime < ms);
};
const markTime = (docName, lifecycleEventName) => {
// Calculating these values before the below `mark` invocation ensures that delays in
// reaching across to the other window object doesn't interfere with the correctness
// of the test.
const dateNow = Date.now();
const performanceNow = performance.now();
window.opener.mark({
docName,
lifecycleEventName,
performanceNow: performanceNow,
dateNow: dateNow
});
};
const setupUnloadPrompt = (docName, msg) => {
window.addEventListener("beforeunload", ev => {
markTime(docName, "beforeunload");
return ev.returnValue = msg || "Click OK to continue test."
});
};
const setupListeners = (docName, nextDocument) => {
window.addEventListener("load", () => {
markTime(docName, "load");
document.getElementById("proceed").addEventListener("click", ev => {
ev.preventDefault();
if (nextDocument) {
document.location = nextDocument;
} else {
window.close();
}
})
});
setupUnloadPrompt(docName);
window.addEventListener("unload", () => {
markTime(docName, "unload");
if (docName !== "c") { syncDelay(1000); }
});
};