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Webmaster Forum / HTML, CSS, Scripts / JavaScript / August 2007(window == any_element) always return true in IE6?
test page: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http:// www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title></title> </head> <body> <input type=button id=a onclick=checkme() value=clickme> </body> </html> <script type="text/javascript"><!-- function checkme() { var a = document.getElementById("a"); alert("window==a? "+(window==a)); //true alert("a==window? "+(a==window)); //false } --></script> is it a bug of IE? > test page: > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd"> [quoted text clipped - 16 lines] > --></script> > is it a bug of IE? Disregarding for a minute the script tag you have outside your HTML tag (invalid!), this does indeed seem to be true: JScript in IE6 & IE7 seems to have a non-transitive comparison operator. You can try it by navigating to http://www.google.com on IE and copy/pasting the following into your address bar: javascript:var g=document.getElementById('lgpd');alert((window==g)+','+ (g==window)); Now *THAT* is some serious junk code. -David > > test page: > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd"> [quoted text clipped - 29 lines] > > -David not "non-transitive", "asymmetric". Apologies. David Golightly wrote on 30 aug 2007 in comp.lang.javascript: > Disregarding for a minute the script tag you have outside your HTML > tag (invalid!), this does indeed seem to be true: JScript in IE6 & IE7 [quoted text clipped - 6 lines] > > Now *THAT* is some serious junk code. Let's keep it simple and compare: <body> <script type='text/javascript'> var g=document.body; alert((window == g)+','+(g == window)); </script> and: <body> <script type='text/javascript'> var g=document.body; alert((window === g)+','+(g === window)); </script>  SignatureEvertjan. The Netherlands. (Please change the x'es to dots in my emailaddress) On Aug 30, 10:57 am, "Evertjan." <exjxw.hannivo...@interxnl.net> wrote: > David Golightly wrote on 30 aug 2007 in comp.lang.javascript: > [quoted text clipped - 29 lines] > The Netherlands. > (Please change the x'es to dots in my emailaddress) Whichever way you slice it, same result. How 'bout that: IE's equality operator is apparently broken. -David David Golightly said the following on 8/30/2007 2:13 PM: <snip> > Whichever way you slice it, same result. How 'bout that: IE's > equality operator is apparently broken. It isn't IE's equality operator, it is IE's resolution of the window object. If it were the equality operator then the the alerts would be the same for window==g and g==window and they aren't. That alone says it isn't the operator but something else. Why anybody would need to compare a variable to window eludes me though. SignatureRandy Chance Favors The Prepared Mind comp.lang.javascript FAQ - http://jibbering.com/faq/index.html Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/ > David Golightly said the following on 8/30/2007 2:13 PM: > [quoted text clipped - 7 lines] > the same for window==g and g==window and they aren't. That alone says it > isn't the operator but something else. More on IE and window.event, see Dean's comment on window being not equal to window. http://www.davidflanagan.com/blog/2007_03.html Interesting post on attachEvent's event argument. http://www.davidflanagan.com/blog/2006_10.html#000114 > Why anybody would need to compare a variable to window eludes me though. IF you have a popup or iframe. var win = iframe.contentWindow; window is weird in IE. Garrett > -- > Randy > Chance Favors The Prepared Mind > comp.lang.javascript FAQ -http://jibbering.com/faq/index.html > Javascript Best Practices -http://www.JavascriptToolbox.com/bestpractices/ > test page: > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http:// [quoted text clipped - 17 lines] > --></script> > is it a bug of IE? Your code is completely invalid: http://validator.w3.org/ But know this: `window' is a reference to a host object. With host objects, all bets are off per the ECMAScript language specification. And MS JScript is an ECMAScript implementation. PointedEars Signaturevar bugRiddenCrashPronePieceOfJunk = ( navigator.userAgent.indexOf('MSIE 5') != -1 && navigator.userAgent.indexOf('Mac') != -1 ) // Plone, register_function.js:16 |
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