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delay DOM node walking via requestIdleCallback

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This commit is contained in:
Paul Irish
2018-03-19 10:09:53 -07:00
committed by Ilya Grigorik
parent e85dad3280
commit 8e199cd975
1 changed files with 15 additions and 4 deletions
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19
inject.js
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@@ -285,18 +285,29 @@ chrome.runtime.sendMessage({}, function(response) {
}
}
}
// Process the DOM nodes lazily
function enqueueCheckNodes(node, parent, added) {
const checkNodes = _ => checkForVideo(node, parent, added);
if ('requestIdleCallback' in window) {
requestIdleCallback(checkNodes, {timeout: 1000});
} else {
checkNodes();
}
}
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
forEach.call(mutation.addedNodes, function(node) {
if (typeof node === "function")
return;
checkForVideo(node, node.parentNode || mutation.target, true);
})
enqueueCheckNodes(node, node.parentNode || mutation.target, true);
});
forEach.call(mutation.removedNodes, function(node) {
if (typeof node === "function")
return;
checkForVideo(node, node.parentNode || mutation.target, false);
})
enqueueCheckNodes(node, node.parentNode || mutation.target, false);
});
});
});
observer.observe(document, { childList: true, subtree: true });