[Greasemonkey] add prefetch attributes

[Leo Zelevinsky]

Thanks a lot!

By patching together pieces of other scripts, I was able to add the
prefetch attribute (though I just did link.rel="prefetch" and used a
loop instead of a getbyId since I don't think it has an ID).

What you say about it being too late makes a lot of sense - I have no
idea how I can confirm whether Firefox is prefetching or not. Testing
it is difficult as the web site I'm going to (TWOP) is reporting back
a lot of dropped connections with or without my script :(.

I'll try both the xmlhttprequest and the other way and see if I can
get it to make a difference.

Thanks again.

On 5/16/05, Nikolas Coukouma <lists at atrus.org> wrote:
> Leo Zelevinsky wrote:
> 
> >Thanks!
> >
> >The script is quite different than what I was envisioning though -
> >what it seems to do is preload an image, after determining the image
> >path.
> >
> >What I am thinking of doing is not handling any of the prefetching
> >itself - let Firefox do it, but just to alter the settings on the link
> >to add the prefetch attribute.
> >
> >I guess if that's hard to do for some reason I could try to use
> >GM_xmlhttpRequest instead.
> >
> >And the pages I'm preloading aren't images anyway, though certainly
> >the idea of preloading the image is very useful too.
> >
> >Thanks again though - any help on altering an element in the way I
> >want appreciated (I'm currently reading the 'Diving into greasemonkey'
> >book - so maybe that will answer my questions as well.
> >
> >
> You can add " prefetch" to rel, but I doubt Firefox will act on it. The
> page is already half-loaded by the time your script gets to it. Using
> GM_xmlhttpRequest is the best way to go. Dive into Greasemonkey and the
> Greasemonkey homepage have documentation for it. Basically, all you need
> to do is:
> GM_xmlhttpRequest({ url: "http://something", method: "get" });
> Normally you'd set handlers for when the data arrives, but that doesn't
> matter since you just want the request to be made.
> 
> As for modifying elements, you can usually do:
> var elm = document.getElementById( "something" );
> elm.attr = "value";
> 
> for example,
> elm.rel += " prefetch";
> 
> The DOM way of doing this is using hasAttribute, getAttribute, setAttribute:
> elm.hasAttribute( "rel" ); // does it have a rel attribute?
> var str = elm.hasAttribute( "rel" ); // get the current value of rel
> elm.setAttribute( "rel", str + " prefetch" ); // set the value of rel
> 
> There's a lot more. You can read the W3C's DOM spec, or check out XUL
> Planet's reference
> http://xulplanet.com/references/objref/
> 
> -Nikolas Coukouma
> 
> >On 5/16/05, Julien Couvreur <julien.couvreur at gmail.com> wrote:
> >
> >
> >>Sure, there is a script that does that already for the AppleGeeks site:
> >>http://www.warwick.ac.uk/~esudbi/greasemonkeyscripts/applegeeks_preload.user.js
> >>
> >>Besides looking for links that say "next", you could also look for rel="next"
> >>
> >>Cheers,
> >>Julien
> >>
> >>On 5/16/05, Leo Zelevinsky <leo.zelevinsky at gmail.com> wrote:
> >>
> >>
> >>>Hi all!
> >>>
> >>>I would like to take advantage of the prefetch feature of firefox on
> >>>non-prefetch-aware webpages. Can I use Greasemonkey for this? I did
> >>>some searches with no luck.
> >>>
> >>>It seems like it should be relatively straightforward so I'm wondering
> >>>why I can't find anything. For instance, I'd want to add to a link
> >>>that says "Next" the prefetch attribute automatically.
> >>>
> >>>Any pointers would be much appreciated. Thanks!
> >>>
> 
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