Here is my query:
window.addEventListener("visibilitychange", function(e) {
console.log(window.uidd)
window.uidd = window.uidd || (new Date).getTime() + Math.random()
console.log(window.uidd)
})However, if you open the console for the first time, you will see:
undefined
124124214124124.124
window.uidd // undefined
Why does the last string show undefined?
Unfortunately, I have to present this as a response because I am unable to include images in comments. Nevertheless, upon examining the scenario, I did not observe this particular behavior.
window.uuid variable is not present within window.undefined.visibilitychange event), both the second undefined and the assigned value for window.uuid are logged from the listener.visibilitychange event, resulting in the uuid being logged twice.window.uuid into the console reveals the global uuid value.https://i.sstatic.net/9PUvf.png
The potential issue might stem from how you are linking the event listener.
UPDATE:
Testing with the following webpage example:
<html>
<head>
<script>
window.addEventListener("visibilitychange", function(e) {
console.dir(window);
console.log(window.uidd)
window.uidd = window.uidd || (new Date).getTime() + Math.random()
console.log(window.uidd)
})
</script>
</head>
<body></body>
</html>
This behavior does manifest itself. To access the property correctly, you should employ this.uuid instead of window.uuid, despite the fact that inspecting window will display the .uuid property.
Coincidentally, when replacing your test code with this fixed assignment:
window.addEventListener("visibilitychange", function(e) {
window.foo = window.foo || "bar";
})
it indeed functions as intended, and I can directly view the anticipated value of window.foo in the console.
I share your curiosity and have reached out to the Chrome team for further insights. I'll provide an update to this explanation if they do not respond promptly.
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