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Answer 1

+1 A:

You're in documents's scope there. I'd also suggest you to use Firebug's console.log() function instead of alert() for debugging, then edit your topic.

Kemo 2010-01-02 09:34:42

I deleted my comment before you posted your response. It was sarcastic, not an actual stack overflow rule. I just thought it a little rude to ask someone to edit their topic to use your preferred logging method.

Josh Einstein 2010-01-02 09:43:59

It was just a friendly recommendation, not making someone use what I want him to.

Kemo 2010-01-02 10:34:03

thanks kemo, the console.log is awesome

freenight 2010-01-02 10:35:20

Answer 2

+2 A:

It works for me (Firefox 3.5, latest prototype.js):

<html><head><title></title>
<script src="prototype.js"></script>
<script>
function _debug (msg) {
    document.body.innerHTML += "<p>"+msg+"</p>";
}
document.observe('dom:loaded', function() {
  $$('.answer').each(function(answer) {
    _debug("inside each, .id: "+answer.id);  // works
    _debug("inside each, byId .id: "+document.getElementById(answer.id));
  });
  _debug("outside each, byId literal: "+document.getElementById('answer_73'));
});

</script>
</head><body>

<div id="answer_72" class="answer"></div>
<div id="answer_73" class="answer">foo</div>
<div id="answer_74" class="answer"></div>

</body></html>

results in

foo

inside each, .id: answer_72

inside each, byId .id: [object HTMLDivElement]

inside each, .id: answer_73

inside each, byId .id: [object HTMLDivElement]

inside each, .id: answer_74

inside each, byId .id: [object HTMLDivElement]

outside each, byId literal: [object HTMLDivElement]

Anonymous 2010-01-02 09:38:21

Answer 3

+5 A:

I'll bet you a beer that you have two elements with the id answer_73 in your document.

Pekka 2010-01-02 10:03:21

thanks but it's not, since the '$(answer.id)' works

freenight 2010-01-02 10:09:50

that doesn't mean you still don't have equal IDs. Since the first `answer.id` will just output the ID depending on the iteration, while the second `$('answer_73')` will look in the entire document for that id, and if found more than one will give you trouble.

Luca Matteis 2010-01-02 10:20:43

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prototype $ strange behaviour

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