| --- Log opened Thu Jul 25 00:00:09 2013 |
| 00:09 | | You're now known as TheWatcher[T-2] |
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| 00:52 | < [R]> | ... |
| 00:53 | < [R]> | Why do sites have "Javascript:void(0)" as the href when using onclick? |
| 00:53 | < [R]> | It's like... "I'm going to call some JS to this event doesn't screw up my JS" |
| 00:54 | <&McMartin> | IIRC it's because having event processing code return a value fucked with some browsers |
| 00:54 | <&McMartin> | So by ending your processing code with void(0) your code returned no value, and thus was fine |
| 00:55 | < [R]> | You realize that "Javascript:eventHandler()" works too right? |
| 00:55 | <&McMartin> | You're expecting code idioms that lasted for decades to change everywhere? |
| 00:56 | <&McMartin> | Well, a decade, anyway |
| 00:57 | <&McMartin> | I have no real JS experience, but I would guess on no other information that "Javascript:eventHandler()" doesn't work on IE6 and be about 85% confident in the answer~ |
| 01:00 | <&McMartin> | I suppose I should also point out that firefox *prints out* "javascript:void(0);" even when that is not the entire text of the script. |
| 01:00 | < [R]> | IE has supported it for a long while. |
| 01:01 | <&McMartin> | I do not pretend to understand FF's UI decisions. |
| 01:01 | <&McMartin> | That said |
| 01:01 | <&McMartin> | I'm surprised that you are boggled by having functions end with void(0) |
| 01:01 | <&McMartin> | Everything I *have* read about JS says that this is an idiomatic way of saying "this function returns no value" |
| 01:02 | <&McMartin> | And it doesn't seem unreasonable given everything else about JS and the languages it inherits syntax from. |
| 01:02 | < [R]> | It's not that |
| 01:02 | <&McMartin> | (A similar technique is used in C to say "No, really, I don't make use of this parameter", for instance) |
| 01:02 | < [R]> | It's that they're using onclick with javascript:void(0) as the href. |
| 01:02 | <&McMartin> | Are you looking at the source code, or at the status bar in Firefox? |
| 01:02 | < [R]> | Statusbar in Chrome |
| 01:02 | <&McMartin> | Because the later says that even when there are statements that do things in front of it. |
| 01:02 | <&McMartin> | *latter |
| 01:02 | <&McMartin> | Chrome may be mimicking that. |
| 01:03 | < [R]> | <a style="font-size: smaller; font-weight: bold" class="button" id="more_t1_cb99xnx" href="javascript:void(0)" onclick="return morechildren(this, 't3_1iy79d', 'cb99xnx,cb99s7l,cb9bdnr,cb9bxmn', 6, '')">load more comments<span class="gray"> (8 replies)</span></a> |
| 01:04 | < [R]> | Nope. Unless it's mutating the source on the fly. |
| 01:04 | <&McMartin> | Having no-op JS in the href and real JS in the onclick looks like "idiom to look right in more browsers" to me. |
| 01:05 | <&McMartin> | And that stuff has longevity long past its practical use, because everyone knows that somebody out there never upgrades ever and there's "no reason" to lock them out |
| 01:08 | < [R]> | *Shrugs* |
| 01:08 | < [R]> | As far as I can tell, it's as old as JS itself |
| 01:08 | <&McMartin> | Again, this is pure speculation on my part, but it's really ubiquitous so I assume there's at least a historical reason for it. |
| 01:08 | < [R]> | NS2 supported them. |
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| 05:19 | <&McMartin> | ... oh good, I can use arrays as hashtable keys. That will make things much easier. |
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| 05:23 | < [R]> | ... |
| 05:24 | < [R]> | That sounds like part of the ritual for summoning Codethulu |
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| 14:06 | <@iospace> | quote of the day: "DOUBLE BIOS CROSS THE FLASHES!" |
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| 22:17 | <&McMartin> | Much belated |
| 22:17 | <&McMartin> | "Wait a minute, iospace. I thought crossing the flashes was bad." |
| 22:37 | <&ToxicFrog> | Welp |
| 22:37 | <&ToxicFrog> | I just learned about chunked sequences in clojure |
| 22:37 | <&ToxicFrog> | Short version: fuck chunked sequences |
| 22:37 | <&ToxicFrog> | Long version: don't try to implement recursive data structures |
| 22:38 | | * McMartin sends in the daleks. |
| 22:38 | <&McMartin> | CONCATENATE. |
| 22:38 | <&McMartin> | I don't remember chunked sequences. |
| 22:38 | <&McMartin> | xml-seq is adorably brain-damaged, but xml-zip was, IIRC, relatively sane, and zippers are used for all kinds of tree navigation |
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| 22:39 | <&ToxicFrog> | They are not documented anywhere except in a few paragraphs in The Joy of Clojure and the comments in the clojure implementation. |
| 22:39 | <&ToxicFrog> | Basically, some types of lazy seq will pre-compute some number k of elements when you realize part of them |
| 22:40 | <&ToxicFrog> | But those elements are not realized until all k of them have been computed |
| 22:40 | <&ToxicFrog> | Which means that if the computation of s[n] is defined in terms of s[n-1], and chunking occurs, you will get garbage results because s[n-1] has not yet been realized when s[n] is being computed. |
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| 22:41 | <&ToxicFrog> | This results in situations where, e.g., (f (range)) and (f (iterate inc 0)) give different results. |
| 22:41 | <&McMartin> | Oof |
| 22:42 | <&McMartin> | Hmmm |
| 22:42 | <&ToxicFrog> | There are ways around this involving letfn and single recursive definitions and whatnot |
| 22:42 | <&ToxicFrog> | But if you are doing mutual recursion of the form, e.g., (declare the-list) (defn in-list? [n] (something using list)) (def list (filter in-list? (range)) |
| 22:43 | <&McMartin> | Hrm |
| 22:43 | <&McMartin> | That looks weird to me but I learned this trick in Haskell first |
| 22:43 | <&McMartin> | And I can't find my horrorshow version of Fibonacci that used it in Clojure. |
| 22:44 | <&ToxicFrog> | You're boned unless in-list? never refers to elements in list closer than 32 entries behind. |
| 22:44 | <&ToxicFrog> | Yeah, apparently the correct way to do this is something like |
| 22:44 | <&ToxicFrog> | (def fib (lazy-cat [0 1] (map + fib (rest fib)))) |
| 22:44 | <&ToxicFrog> | And when I get home I'm going to try to rewrite my test case in that form |
| 22:45 | <&McMartin> | Oooh, that's better than what I did |
| 22:45 | <&McMartin> | Which I still can't find |
| 22:45 | <&McMartin> | But I was using cons and lazy-seq directly |
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| 23:03 | <@iospace> | McMartin: no, as in "double rainbo cross the sky" |
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| --- Log closed Fri Jul 26 00:00:25 2013 |