Path: csiph.com!feeder.erje.net!1.eu.feeder.erje.net!news.mb-net.net!open-news-network.org!.POSTED.75.236.197.178.dynamic.wless.lssmb00p-cgnat.res.cust.swisscom.ch!not-for-mail From: Thomas 'PointedEars' Lahn Newsgroups: comp.lang.javascript Subject: Re: Inserting stuff received with AJAX into the DOM Date: Mon, 21 Aug 2017 17:47:22 +0200 Organization: PointedEars Software (PES) Lines: 51 Message-ID: <3126118.iIbC2pHGDl@PointedEars.de> References: <7e54d58e-0ce6-4bb5-9f07-f65b69a94a64@googlegroups.com> <5846bd55-f0bd-4088-a596-aba50eef32a5@googlegroups.com> <11843581.uLZWGnKmhe@PointedEars.de> <7340100.T7Z3S40VBb@PointedEars.de> <19530051.EfDdHjke4D@PointedEars.de> <6718455.EvYhyI6sBW@PointedEars.de> Reply-To: Thomas 'PointedEars' Lahn Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8Bit Injection-Info: gwaiyur.mb-net.net; posting-host="75.236.197.178.dynamic.wless.lssmb00p-cgnat.res.cust.swisscom.ch:178.197.236.75"; logging-data="23225"; mail-complaints-to="abuse@open-news-network.org" User-Agent: KNode/4.14.2 Face: 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 X-Face: %i>XG-yXR'\"2P/C_aO%~;2o~?g0pPKmbOw^=NT`tprDEf++D.m7"}HW6.#=U:?2GGctkL,f89@H46O$ASoW&?s}.k+&. On 21/08/2017 16:44, Thomas 'PointedEars' Lahn wrote: >> Cezary Tomczyk wrote: >>> I am sure that: >>> >>> const par = document.createElement( 'p' ); >>> >>> will always create HTML element. I can't see any real scenario where >>> createElement method will return "something else than a reference to an >>> object that has a method named “appendChild”" in that particular >>> scenario. >> >> Why? > > https://developer.mozilla.org/en-US/docs/Web/API/Document/createElement > […] Certainly you can come up with something better than hearsay. > In that particular case: > > const par = document.createElement( 'p' ); > > this will return an HTML p element. It may. > As for "something else than a reference to an object that has a method > named “appendChild”" may occur, of course, but this is a very rare case When in doubt, be careful. > I would say and even, if it'll occur then calling "appendChild" later > will throw a DOM exception which I think it's good because it helps to > catch the error on an early stage. An exception, but not a “DOM exception” will be thrown, if the object does not have the method. Or execution will simply stop with an error. Who knows. createElement() is a host object’s method. > I just don't see a benefit of using "if" statement here instead of simple: > > par.appendChild(text); Defensive programming. -- PointedEars FAQ: | | Twitter: @PointedEars2 | Please do not cc me./Bitte keine Kopien per E-Mail.