asked on

Timing of Greasemonkey Scripts

I'm having trouble with the timing of a greasemonkey script. The index.html I'm loading is:

<head>
<script src="js/bad.js" type="text/javascript"></script>
<script src="js/a.js" type="text/javascript"></script>
<script src="js/b.js" type="text/javascript"></script>
<script src="js/c.js" type="text/javascript"></script>
<script src="js/swfupload/swfupload.js" type="text/javascript"></script>

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I don't want it to load bad.js. I want it to load good.js instead. The bad.js script has console.log("bad.js"); at the beginning and the good.js script has console.log("good.js"); at the beginning, so I can see in the Firebug console which scripts are loading.

The problem is that, while my greasemonkey script stops bad.js from loading and gets good.js to load instead, the next script tags load in the meantime, before good.js loads, so swfupload.js loads before good.js. But that's not good because swfupload.js depends on functions in bad.js, (now good.js).

My greasemonkey script is

// ==UserScript==
// @grant		none
// @name           	full_src
// @downloadURL 	http://www.mysite.com/js/gmscripts/gm1.user.js
// @include        	http://www.mysite.com/index.html
// @run-at         	document-start
// ==/UserScript==

window.addEventListener('beforescriptexecute', function(e) {
	
	src = e.target.src;
			
	if(src.search(/bad\.js/) > 0){
		e.preventDefault();
		e.stopPropagation();       // block bad.js  
		
	  	head= document.getElementsByTagName('head')[0];
      	        script= document.createElement('script');
      	        script.type= 'text/javascript';
      	        script.src= 'js/good.js';
      	        head.appendChild(script);
	}
},true);

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I would expect that the appendChild would append the new node after the node we just blocked since at the time this script is executing, the node being blocked is the last child of the parent "head". But the script seems to append it farther down. Somehow it's looked ahead and seen more of index.html so that "last" is now farther down.

Can anyone suggest how I can get good.js to load instead of bad.js, before swfupload.js loads?

Thanks

(By the way, my first attempt at this was to just modify the src field for the bad.js script node to change "bad.js" to "good.js", and then not try to stop its execution. But that always loaded the bad.js script, like the change happened too late.)

nap0leon

While your GreaseMonkey script is busy stopping bad.js from loading, the rest of the page keeps processing. So your upload.js loads before good.js.

What you could do is look for a reference to something that is defined in your good.js file and make all other scripts wait for that thing to become defined.

In this demo, notice the console loggings stops at "17" which is just an arbitrary number I picked to show that the while loop runs until goodJS becomes defined.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
	<title>Q_28036037.html</title>
	<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>

<script type="text/javascript">

var i=0;
while (typeof goodJS == 'undefined'){
	i=i+1;
	console.log(i);
	if (i==17){var goodJS='wowzers';}
}

</script>
</head>

<body>
	<div id="container">
	</div>
</body>
</html>

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Note: I have not tested this approach looking for an object's defintion that gets loaded from a different .js file.

Edit: Tried this out by looking for (typeof $ == 'undefined') and the results were less than desirable. If the jQuery reference is above my code, my code never needs to run. If the reference is below my code, the while loop never finishes so the page never gets to the line to bother trying to load jQ.

But... maybe that would work for you - change bad.js to good.js and force the browser to wait until good.js is loaded.

steva

ASKER

nap0leaon,

I'm still looking over what you sent, but your first sentence raises a question:

While your GreaseMonkey script is busy stopping bad.js from loading, the rest of the page keeps processing.

It certainly acts that way, but I thought JavaScript was single threaded and can only do one thing at a time. How can it process new <script>s coming in when it's in my Greasemonkey script?

leakim971

The following display 1.8.3 because I replaced the library inside the GM script :

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Q_28036037</title>
<script type="text/javascript" id="src1" src="http://code.jquery.com/jquery-1.8.2.js"></script>
<script type="text/javascript" id="src2" src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript" id="src3">
		alert($().jquery);
</script>
</head>
<body>
</body>
</html>

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Don't forget to replace the url by yours :

// ==UserScript==
// @grant		none
// @name           	full_src
// @downloadURL 	http://localhost/gm1.user.js
// @include        	http://localhost/greasemonkey_steva.html
// @run-at         	document-start
// ==/UserScript==

//window.addEventListener('load', function(e) {
window.addEventListener("beforescriptexecute", function(e) {
	var id = e.target.id;
	if(id=="src3") {
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leakim971

So for your code :

// ==UserScript==
// @grant		none
// @name           	full_src
// @downloadURL 	http://www.mysite.com/js/gmscripts/gm1.user.js
// @include        	http://www.mysite.com/index.html
// @run-at         	document-start
// ==/UserScript==

window.addEventListener('beforescriptexecute', function(e) {
	
	src = e.target.src;
			
	if(src.indexOf("js/swfupload/swfupload.js")>=0){


// put here the code of << js/good.js >> so he will replace all objects with same name declared by bad.js

	}
},true);

Open in new window

steva

ASKER

nap0lean,

You suggested

look for a reference to something that is defined in your good.js file and make all other scripts wait for that thing to become defined.

I don't have access to any of the scripts to change them.

Leakikm,

It looks like you're letting the bad.js script load (1.8.2 in your case) and then at id='src3' you load good.js (1.8.3 in your case) and you count on the loader to update the pointers to the common routines to the second ones loaded. Everyone loaded after src3 would then see the pointers to the last loaded jQuery.

Is that right?

The problem is that in the production environment I will not have access to the index.html coming down, so I can't insert a <script> node that has id='src3'.

I can see what script tags are coming down, though, so I might be able to look for the one just after bad.js. Suppose it's d.js. When greasemonkey sees d.js it could insert the good.js directly, as you did above for 1.8.3, replacing all the code pointers that were in bad.js with those in good.js, and then it would let d.js proceed to load.

Everyone:

I set up another test that shines a little more light on the situation but I'm still far from clear.

The index.html now is

<script src="js/libraries/a.js" type="text/javascript"></script>
<script src="js/libraries/b.js" type="text/javascript"></script>
<script src="js/libraries/c.js" type="text/javascript"></script>

<script src="js/libraries/bad.js" type="text/javascript"></script>

<script src="js/libraries/d.js" type="text/javascript"></script>
<script src="js/libraries/e.js" type="text/javascript"></script>
<script src="js/libraries/f.js" type="text/javascript"></script>
<script src="js/libraries/g.js" type="text/javascript"></script>

Open in new window

The goal is to replace bad.js with good.js and have d.js see good.js stuff rather than bad.js stuff.
When GM stops at src="js/libraries/bad.js" I can do a

console.log(head.lastChild)

and see that there are truly no nodes yet in the DOM beyond where we've stopped. And when I do a head.appendChild(good); to put good.js at this point that really is where it goes. I know that now because if I look at the HTML in Firebug after the page has loaded I see:

good.js got inserted exactly where I meant to put it, and so it appears that GM did all I could ask it to do.

The problem is that the loaded code doesn't execute in this order. The console log generated during the page load shows:

a-g.js and good.js each have a console line at the top that displays their name, so we see each of these in the console when it loads and runs. But we don't see good.js coming in after c.js. It doesn't load until after g.js. The Reference error shown is from d.js, which looks for a variable declared in good.js to see if good.js has loaded first, as we want.

It's also strange that the Reference error, that comes from d.js doesn't get reported until e, f and g have loaded. Clearly when the JavaScript engine ran into this bad reference, it passed it off to someone and continued loading. Finally a callback fired and reported the Reference error and by that time files e,f, and g had loaded and run. It acts like there are all kinds of threads running concurrently here.

At this point I'm just trying to understand what I'm fighting. My understanding with JavaScript is that it is critical that you load file "a" before file "b" if file "b" callS anything in "a", but with the JavaScript engine jumping around like this I don't see how any load order can be guaranteed.

Thanks for any enlightenment.

ASKER CERTIFIED SOLUTION

leakim971

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See answer

steva

ASKER

Leakim,

I like your idea of having the GM generate the newer code.I think that may be the solution. I notice that you just included the code and that let you display 1.8.3 instead of 1.8.2. I'm having a little trouble, though, getting this to work on my small test bed. As before, index.html is loading:

bad.js creates a test variable and sets it to "bad":

var test = "bad";
console.log("bad.js: test = ", test);

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The GM changes the variable to "good":

// ==UserScript==
// @grant			none
// @name           	full_src
// @downloadURL 	http://www.mysite.com/js/gmscripts/full_src.user.js
// @include        	http://www.mysite.com/index.html
// @run-at         	document-start
// ==/UserScript==

window.addEventListener('beforescriptexecute', function(e) {
	src = e.target.src;
	if(src.search(/d\.js/) > 0){
		test = "good";
	}
},true);

Open in new window

And d.js displays the value of test that it finds:

console.log("d.js: test=", test);

Open in new window

So if we were successful in overwriting what bad.js wrote, d.js will see "good".
But the above code doesn't work:

To make it work I have to change GM to set window.test="good", instead of test="good":

It seems to me that the test variable in the GM, on line 12, is already "global" since it's not preceded by var. So I'm not sure why I have to write window.test="good" in the GM to write something that d.js sees. I just want to make sure I understand the scopes involved here before I start slapping in large amounts of code.

Thanks
(I think we're almost done!)

leakim971

I think all your answer is here : http://wiki.greasespot.net/Greasemonkey_Manual:Environment

Take a look to the jQuery lib : http://code.jquery.com/jquery-1.8.3.js
We have at the end :

// Expose jQuery to the global object
window.jQuery = window.$ = jQuery;

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steva

ASKER

Leakim,

Ok, I understand now that GM scripts run in a wrapper so variables you create there are not in the global window space. The larger scripts I would want to inject from there, though, do expose themselves to the global space, so it's not a problem.

But I'm still not able to successfully overwrite the script I want. I can see from Firebug's Net tab that when Firefox gets a new HTML file to process it first puts all the script and link nodes on a queue and gives it to a process that starts them all concurrently. So you have 20 or more scripts loading at the same time. If you inject a second copy of one of the scripts asynchronously with GM it seems to step all over the first one, that may still be loading and executing self-invoking functions, as it loads. The loaded system complains of missing functions, etc. and simply doesn't run.

I don't want to hold up the question any more so I gave you the points for your help. I need to fall back now and find a different way forward. I read that the new Chrome browser has better tools than Firefox and even has a GM-like function. Maybe I'll have more success there.

Thanks for your help.
Steve

I

leakim971

Hi Steva,

It's scriptaculous framework or YUI?
Could you post this "bad" script?

Best Regards.

steva

ASKER

Thanks, but I've got it! I've been trying to replace a minified script (the "bad" script) with a "beautified" version of the same script, so I can break inside of it and single step through it. The beautified version is 44,000 lines and that's what I was trying to inject with GM.

It turns out (I finally discovered at 4AM this morning) that there's a Firefox plugin that will deminify minified scrips as they're downloading, so the deminified version is what runs in your browser. It's exactly what I was trying to do!

Steve

leakim971

:))

there' a simple button for this on chrome and safari, here in blue

steva

ASKER

Yes, that's one of the tools I saw on Chrome that made me think I should try doing this with Chrome, but then I found the same tool in a Firefox plugin.

Cheers
Steve