InformAction Forums

Posted: **Wed Oct 03, 2012 4:33 pm**

Bookmarklet:

javascript: (function() { for(var i = 1; i <= 52; ++i) delayed(i); function delayed(i) { setTimeout(function() { console.log(i); }, 0); } })();

"Source":

Code: Select all

(function() {
	for(var i = 1; i <= 52; ++i)
		delayed(i);
	function delayed(i) {
		setTimeout(function() {
			console.log(i);
		}, 0);
	}
})();

(Open Tools - Web Developer - Web Console before!)
For pages with enabled JavaScript:
1 ... 52
With disabled JavaScript:
52 ... 3
(only last 49!)

noscript-2.5.6-sm+fx+fn.xpi\components\noscriptService.js

Code: Select all

            while (tt.length && count++ < 50) { // let's prevent infinite pseudo-loops
              tt.sort(function(b, a) { return a.d < b.d ? -1 : (a.d > b.d ? 1 : 0); });
              t = tt.pop();
              t.f.call(window, t.a);
            }

You should, at least, use Array.shift(), not .pop().

And this is very simple way to do something pseudo asynchronously:

Code: Select all

Array.forEach(
	document.getElementsByTagName("*"),
	function processAsync(item) {
		setTimeout(function() {
			process(item); // Something slow
		}, 0);
	}
);

And unfortunately following trick fails:

Code: Select all

var delayed = {
	maxActive: 15,
	active: 0,
	queue: [],
	add: function(func, args) {
		if(this.active >= this.maxActive) {
			console.log("wait...");
			this.queue.push(arguments);
			return;
		}
		++this.active;
		var _this = this;
		setTimeout(function() {
			_this.next(--_this.active);
			func.apply(window, args);
		}, 0);
	},
	next: function(cnt) {
		while(cnt++ < this.maxActive && this.queue.length)
			this.add.apply(this, this.queue.shift());
	}
};
function processAsync(item) {
	delayed.add(process, arguments);
}

Some real examples:
https://github.com/Infocatcher/Bookmark ... rs.js#L171
https://github.com/Infocatcher/UserScri ... er.js#L353

P.S. I get

Ooops, something in your posting triggered my antispam filter...
Please use the "Back" button to modify your content and retry.

for

Code: Select all

Tools \– Web Developer \– Web Console

without "\".

Posted: **Wed Oct 03, 2012 8:49 pm**

Giorgio,

Code: Select all

–/–

^replace "/" here with a space and your anti-spam won't let you post it.

Posted: **Fri Oct 05, 2012 12:06 am**

Spam filter is a work in progress due to the massive amount of crap we get, so be patient, it will be tweaked as we get false positives. Thanks.

Posted: **Fri Oct 05, 2012 1:53 pm**

Infocatcher wrote: You should, at least, use Array.shift(), not .pop().

Yes, this is a bug and is gonna be fixed in next release.

Infocatcher wrote: And this is very simple way to do something pseudo asynchronously:

Unfortunately I have to keep it synchronous because bookmarklets temporary set "Allow scripts globally" for compatibility reasons, and you don't want this to happen periodically in an asynchronous fashion

Infocatcher wrote: Ooops, something in your posting triggered my antispam filter...

Fixed: you were using an Unicode hyphen character, which was caught by my filter against foreign languages (esp. Russian and Chinese) spam.
Now it's more specific, letting symbols go through.

Posted: **Fri Oct 05, 2012 2:22 pm**

Giorgio Maone wrote:Unfortunately I have to keep it synchronous because bookmarklets temporary set "Allow scripts globally" for compatibility reasons, and you don't want this to happen periodically in an asynchronous fashion

But what about current limit of setTimeout/setInterval calls?
May be just replace setTimeout~~/setInterval~~ by synchronous equivalents, without any arrays for "queue" (and without delays, of course)?
Or replace it by corresponding functions from window with enabled scripts.
Or can I detect, that scripts are disabled and don't call asynchronous things in this case?

[Upd]
Or create asynchronous equivalents using window.postMessage() or createEvent()/dispatchEvent()?

Posted: **Fri Oct 05, 2012 8:20 pm**

Fixed in latest development build 2.5.7rc5.
I raised the limit to 200 and fixed the ordering.
Making them unconstrained or asynchronous is out of discussion because of the need for allowing scripts globally in a controlled and safe way.
Anyway if scripts are allowed for the page, no emulation occurs and the timeout callbacks happen "normally", as expected.

Posted: **Sat Oct 06, 2012 2:56 pm**

Giorgio Maone wrote:I raised the limit to 200 and fixed the ordering.

Thanks!

Anyway I can get real

Code: Select all

function (f, d, a) {
    if (typeof f != "function") {
        f = new Function(f || "");
    }
    tt.push({f: f, d: d, a: a});
    return 0;
}

for

Code: Select all

alert("setTimeout:\n" + setTimeout);

from bookmarklet, so I can do some corrections from my side.
[Upd]: Improve compatibility with NoScript + disabled scripts

And another issue:

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javascript: setTimeout(function(a, b, c, d, e) { alert(Array.join(arguments, ", ")); }, 0, 1, 2, 3, 4, 5); void 0;

Firefox only, as I know, but built-in setTimeout produce "1, 2, 3, 4, 5", not only "1".

Another idea: use evalInSandbox() (as Greasemonkey) - works in pages with disabled scripts, but setTimeout/setInterval doesn't work for now (see https://github.com/greasemonkey/greasem ... ef-7eccacb).

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