Re: Argument funkcji

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#51867

From: Cezary Tomczyk
Date: Sat, 03 Mar 2018 16:30

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On 03/03/2018 16:34, Borys Pogoreło wrote:
> Dnia Sat, 3 Mar 2018 06:25:59 -0800 (PST), zpksoft napisał(a):
> 
>> OK, daj więc przykład. Ułatwię Ci: mamy tabelę z wierszami. User klika w
>> jakiś wiersz. Podaj mi teraz kod na jego identyfikację przez "przejście
>> po skojarzonych elementach DOM".
> 
> e.target
> 
> Ile razy można to powtarzać? To jest jednoznaczne wskazanie elementu. I
> zburzę Ci teraz wizję świata: ID w HTML wcale nie musi być unikalne.

[...]
Nie tak do końca jednoznaczne, bo:

<a href="http://www.ctomczyk.pl/" id="link"><span>Blog</span></a>

const link = document.getElementById('link');

link.addEventListener('click', eventListener);

Teraz, jak klikniesz na <span> to e.target będzie wskazywać na <span>, a 
nie na <a> ;-)

Jest jeszcze 
https://developer.mozilla.org/en-US/docs/Web/API/Event/currentTarget

-- 
Cezary Tomczyk
http://www.ctomczyk.pl/

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From: Cezary Tomczyk <cezary.tomczyk@gmail.com>
Newsgroups: pl.comp.lang.javascript
Subject: Re: Argument funkcji
Date: Sat, 3 Mar 2018 17:30:21 +0100
Organization: csiph.com Internet News Service
Message-ID: <p7eiiu$etm$1@csiph.com>
References: <5a8d1d93$0$674$65785112@news.neostrada.pl> <148vihvftubia.1e9gxiae9fy4p.dlg@40tude.net> <e4b021b8-9de9-450b-a7b8-7cbf450f6719@googlegroups.com> <1qn3p672u6yl5.1585lwp0arhbr.dlg@40tude.net> <1b368637-7199-4b74-85d2-5a359e6666e0@googlegroups.com> <15dvc5ead1h2c.cg8ko59kdlzt$.dlg@40tude.net> <246a73c9-8dc7-4ee0-946e-885933c13103@googlegroups.com> <27t8tt1m96wu.11hqw4vglcdjq.dlg@40tude.net> <d4de74d5-ae29-4205-acd7-096434f0e227@googlegroups.com> <11hsdnx36lvz3.sjxote5c1628.dlg@40tude.net> <f323afc1-4b40-449a-a09e-47e042286a28@googlegroups.com> <2762d7f6-99fd-4697-b267-dc1ce7a9fe24@googlegroups.com> <18glwbnoogv4i$.ob1q7xeh9yly$.dlg@40tude.net> <3c1ede4e-1fb8-4574-9e6a-429e512643db@googlegroups.com> <1ekeb91h9bvln$.mmvu0slmr0h3$.dlg@40tude.net> <aa018e4f-40a5-478d-a4d9-2046b62a4745@googlegroups.com> <1er8w9haivbcf$.1602yifr4w3cv.dlg@40tude.net> <8798fb76-76a4-4794-b34b-5da0c4df9e5a@googlegroups.com> <wxlhxhmn42me.1cew5dloz6okt$.dlg@40tude.net>
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