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Message-ID: <1930014.TA4aT0qaH3@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Tue, 19 Nov 2013 19:55:15 +0100
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Subject: Re: Syntax to access the selected option's value
Newsgroups: comp.lang.javascript
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Christoph Michael Becker wrote:

> Bart Van der Donck wrote:
>> Say the following code:
>> 
>> <form name="f" method="get"> <select name="myName" id="myID"> <option
>> value="a">a</option> <option value="b">b</option> <option
>> value="c">c</option> </select> </form>
>> 
>> There are two 'official' ways to read out the current selected
>> value:
>> 
>> document.getElementById('myID').value
>> document.f.myName.options[document.f.myName.selectedIndex].value
> 
> It seems reasonable to distinguish between referencing the form element
> and accessing its value.  The latter is explained in this NG's FAQ[1],
> the former in a side note to the FAQ[2].

However, the “official“, i.e. *both* standards-compliant and backwards-
compatible approach is

  var el = document.form["f"].elements["myName"];
  el.options[el.selectedIndex].value

but it only works for el.type == "select-one", and it is necessary to check 
that el.selectedIndex is not out of bounds; at least, that it is not 
negative.

>> But I can't find any reasonable environment where the following
>> fails:
>> 
>> document.f.myName.value
> 
> As explained in the FAQ[1], this would fail under NN4, for instance.

It also fails under certain circumstances in IE/MSHTML.
 
-- 
PointedEars

Twitter: @PointedEars2
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