11315 2006-10-16 08:50:31 -0700 Mutating document.constructor.prototype mutates Object.prototype 2007-06-25 23:43:22 -0700 1 1 1 Unclassified WebKit WebCore JavaScript 419.x Mac OS X 10.4 RESOLVED FIXED http://bdash.net.nz/files/constructor-prototypes.html P2 Normal --- 1 webkit webkit-unassigned bleroy ggaren heycam mrowe sam oldest_to_newest 52448 0 webkit 2006-10-16 08:50:31 -0700 Not wanting to rehash discussions in the wider community about the use of Object.prototype to extend the native JS objects, I have found the following inconsitency between the MS Atlas Firefox and Safari compatibility layers that I do not think is intended, but on reviewing the JS code cannot see how this is happened unless there is a possible bug in Safari. In AtlasCompat.js (see: http://atlas.asp.net/ScriptLibrary/Atlas/Release/AtlasCompat.js) the _loadSafariCompatLayer() function appears to add 'getElementById', 'attachEvent' and 'deleteEvent' functions to every native Object of the window rather than just the HTMLElement prototype Object that it intends. To replicate: 1. Go to http://atlas.asp.net/atlastoolkit/Accordion/Accordion.aspx in Safari and Firefox (or other Atlas using site) 2. In each enter to following in the address bar to create a new Object and then iterate through its properties: javascript:var mytest = new Object();mytest.myprop = 'prop';for (var key in mytest){alert(key+' = '+typeof(mytest[key]))} 3. In Firefox there will be one alert with a value of 'myprop = prop'. In Safari there will be 4 alerts, including the extra function names (Tested in Safari 2.0.4 and Firefox 1.5.0.7) I believe that this manipulation of Objects (in Safari only) is one of the reasons why developers have been having problems integrating custom code or other OS libraries (e.g. Prototype) with Atlas in Safari, and changing this will greatly simplify things. This may be an MS Atlas JS bug so this is cross-posted to the ASP.NET AJAX Discussion forum here: http://forums.asp.net/1007/ShowForum.aspx (its being moderated). However any work with the MS Atlas developers on their Safari Compatibility layer JS would be greatly appreciated. 52390 1 mrowe 2006-10-16 14:39:11 -0700 I'm of the opinion that this bug is in the Atlas Safari compatibility layer. Visiting the URL you provide in Safari produces the results that you describe. If I tell Safari to use a Mozilla-derived user agent string, I get the expected behaviour of the single alert. This suggests to me that the Atlas Safari "Compatibility layer" doesn't live up to its name. 52391 2 mrowe 2006-10-16 14:41:03 -0700 Some further details for clarification: I tested this in both WebKit 418.9 (latest released WebKit) and a development build of WebKit from this morning. With the default Safari user agent, the problem is visible. When spoofing as Firefox, the problem goes away. Browser sniffing is by far the most likely cause. 52197 3 bleroy 2006-10-17 18:19:22 -0700 (In reply to comment #2) > Some further details for clarification: I tested this in both WebKit 418.9 > (latest released WebKit) and a development build of WebKit from this morning. > With the default Safari user agent, the problem is visible. When spoofing as > Firefox, the problem goes away. Browser sniffing is by far the most likely > cause. The Atlas compat layer has been completely redesigned so this problem should disappear with the next release, which is imminent. Still, it seems a bit weird that extending the DOM element prototype would extend the Object prototype, as seems to be the case here... That might be a bug independently of Atlas and may be worth checking. 52169 4 mrowe 2006-10-17 19:54:20 -0700 For reference, the compatibility layer lives at <http://atlas.asp.net/atlastoolkit/WebResource.axd?d=ZidpH4MlDxMuA9Jx5T0S2RlYrgnGn8zp6lOCmDxRTEeIDVmeAbTy9eZPPvGZl_JrrSL40S25JCAqX-J26XRbphlI2WaPp7Ax0ZHC9o6n7HaZx4XWo7OuUA2&t=632939316100000000>. 52171 5 mrowe 2006-10-17 20:25:54 -0700 So I got bored and decided to reduce this issue to see what exactly was going wrong. My initial assumption was that the Atlas had been doing something incorrect inside the Safari-specific portion of the JavaScript. This code wasn't easily testable on other browsers, so I have reduced the issue. The reduction is available from <http://bdash.net.nz/files/constructor-prototypes.html>. The meat of the issue appears to be that document.constructor.prototype and document.createTextNode("").constructor.prototype both reference Object.prototype. Adding properties to this results in all Object's gaining the new properties. Firefox does not exhibit this behaviour on the reduction. 51957 6 bleroy 2006-10-18 09:57:11 -0700 That explains it, thanks. We could actually have changed the document object directly instead of document.constructor.prototype as there is only one... Personally, I wouldn't expect WebKit to fix that as long as document is of type Object, but... Has the WebKit team considered doing what Firefox and Opera are doing, which is that elements are instances of HTMLElement, and document is an instance of HTMLDocument (both types deriving from Node)? 6750 7 ap 2007-06-22 05:26:07 -0700 Actually marking confirmed. 6695 8 ggaren 2007-06-22 11:29:59 -0700 I think there are two issues here: 1. HTMLDocument.prototype should be the document prototype, not the object prototype 2. HTMLDocument.prototype.__proto__ should == Node.prototype 6660 9 ggaren 2007-06-22 12:14:25 -0700 The problem seems to be that our DOM bindings don't generate the .constructor property correctly. javascript:alert(document.constructor === window.Object) => true (should be false) javascript:alert(document.constructor === window.HTMLDocument) => false (should be true) 6656 10 heycam 2007-06-22 17:46:50 -0700 (In reply to comment #8) > I think there are two issues here: > 1. HTMLDocument.prototype should be the document prototype, not the object > prototype > 2. HTMLDocument.prototype.__proto__ should == Node.prototype Shouldn't HTMLDocument.prototype.__proto__ == Document.prototype? 6398 11 15213 sam 2007-06-24 21:44:19 -0700 Created attachment 15213 patch 6273 12 mjs 2007-06-25 21:34:06 -0700 In general this looks good, but I think it would be good to cover a few more cases, maybe at least one HTML element, at least one SVG element, and a couple of things that aren't descended from Node at all. r=me either way, but please consider improving the test. 6256 13 sam 2007-06-25 23:36:05 -0700 Landed in r23786. 15213 2007-06-24 21:44:19 -0700 2007-06-25 23:43:22 -0700 patch constructorPatch.diff text/plain 8649 sam SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiAyMzc1NikKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMTYgQEAKKzIwMDctMDYtMjQgIFNhbSBXZWluaWcgIDxzYW1Ad2Via2l0Lm9yZz4K 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