FAQ Topic - How do I trim whitespace? (2010-04-07)
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From: Dr J R Stockton on 8 Apr 2010 14:04 In comp.lang.javascript message <4bbbbcf9$0$279$14726298(a)news.sunsite.dk >, Tue, 6 Apr 2010 23:00:03, FAQ server <javascript(a)dotinternet.be> posted: >Implementations are inconsistent with ` \s `. For example, >some implementations do not match ` \xA0 ` (no-break space), >among others. That is an unsafe statement, unless checked for each release of the FAQ. To fix that, just insert ", at yyyy-mm-dd" giving the date of check. It seems likely that no browser will STOP matching \xA0, in which case the only one of the 5 major browsers that fails seems to be MSIE. Why not just put "For example, MSIE 8 does not match ..." and maybe add the version of the script engine. Currently I have JScript 5.8.22960. -- (c) John Stockton, nr London UK. ?@merlyn.demon.co.uk Turnpike v6.05 MIME. Web <URL:http://www.merlyn.demon.co.uk/> - FAQish topics, acronyms, & links. Proper <= 4-line sig. separator as above, a line exactly "-- " (RFCs 5536/7) Do not Mail News to me. Before a reply, quote with ">" or "> " (RFCs 5536/7)
From: Garrett Smith on 8 Apr 2010 20:34 Dr J R Stockton wrote: > In comp.lang.javascript message <4bbbbcf9$0$279$14726298(a)news.sunsite.dk >> , Tue, 6 Apr 2010 23:00:03, FAQ server <javascript(a)dotinternet.be> > posted: > >> Implementations are inconsistent with ` \s `. For example, >> some implementations do not match ` \xA0 ` (no-break space), >> among others. > > That is an unsafe statement, unless checked for each release of the FAQ. > To fix that, just insert ", at yyyy-mm-dd" giving the date of check. > > It seems likely that no browser will STOP matching \xA0, in which case > the only one of the 5 major browsers that fails seems to be MSIE. > > Why not just put "For example, MSIE 8 does not match ..." and maybe add > the version of the script engine. Currently I have JScript 5.8.22960. > OK. That is more specific; sounds like an improvement. I'll add and update the FAQ with that. -- Garrett comp.lang.javascript FAQ: http://jibbering.com/faq/
From: Garrett Smith on 9 Apr 2010 00:28 Garrett Smith wrote: > Dr J R Stockton wrote: >> In comp.lang.javascript message <4bbbbcf9$0$279$14726298(a)news.sunsite.dk >>> , Tue, 6 Apr 2010 23:00:03, FAQ server <javascript(a)dotinternet.be> >> posted: >> >>> Implementations are inconsistent with ` \s `. For example, >>> some implementations do not match ` \xA0 ` (no-break space), >>> among others. >> >> That is an unsafe statement, unless checked for each release of the FAQ. >> To fix that, just insert ", at yyyy-mm-dd" giving the date of check. >> >> It seems likely that no browser will STOP matching \xA0, in which case >> the only one of the 5 major browsers that fails seems to be MSIE. >> That is true of the latest versions of the 5 most popular browsers. >> Why not just put "For example, MSIE 8 does not match ..." and maybe add >> the version of the script engine. Currently I have JScript 5.8.22960. >> > OK. That is more specific; sounds like an improvement. I'll add and > update the FAQ with that. On second thought, mentioning IE8 potentially misleading because it is incomplete. Safari 2 and Konqueror also do not match no-break space. The chart in the article from that entry has test results of what is and what is not matched in various browsers. http://perfectionkills.com/whitespace-deviations/ -- Garrett comp.lang.javascript FAQ: http://jibbering.com/faq/
From: Garrett Smith on 9 Apr 2010 19:30 Thomas 'PointedEars' Lahn wrote: > FAQ server wrote: > [...] > return String(this).replace(/^\s+|\s+$/g, ""); > > should be used instead (ES3F/ES5, 15.5.1), whereas the explicit typecast is > only necessary anyway if this method should be callable for non-String > objects. > The use of String constructor called as a function can result in Error when the this value is a host object. String(new ActiveXObject('Microsoft.XMLHTTP'));// IE Error. IE throws an Error that, when accessing its `name` property, throws the error "Bad variable type". -- Garrett comp.lang.javascript FAQ: http://jibbering.com/faq/
From: Garrett Smith on 9 Apr 2010 19:43
Garrett Smith wrote: > Thomas 'PointedEars' Lahn wrote: >> FAQ server wrote: >> [...] > The use of String constructor called as a function can result in Error > when the this value is a host object. > Correction: ....can result in Error when the supplied argument is a host object. -- Garrett comp.lang.javascript FAQ: http://jibbering.com/faq/ |