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Find radio group value

Max
Hello group,

I use this function to find the value of a radio group:

function valButton(btn) {
var cnt = -1;
for (var i=btn.length-1; i -1; i--) {
if (btn[i].checked) {cnt = i; i = -1;}
}
if (cnt -1) return btn[cnt].value;
else return null;
}

I however found an incompatibility with Internet Explorer, when the
radio group name contains brackets. For example, the radio group name
is '1234[a]'. The Ms Script Debugger stops on btn.length, saying that
it is null or not an object. You may also want to know that it works
well in Firefox and Safari.

Does anyone knows any way I can get IE to digest this? Do you know
another way to acquire radio group value?

Thanks,
Max

Aug 31 '07 #1
1 3919
Max wrote:
I use this function to find the value of a radio group:

function valButton(btn) {
var cnt = -1;
for (var i=btn.length-1; i -1; i--) {
Much too complicated.
if (btn[i].checked) {cnt = i; i = -1;}
}
if (cnt -1) return btn[cnt].value;
Have you ever heard of the `break' statement? But even that is not
necessary here.
else return null;
I'd rather return the empty string here, as the result should be a string,
not a value of an object type.
}
function valButton(btn)
{
if (btn)
{
for (var i = btn.length; i--;)
{
if (btn[i].checked)
{
return btn[cnt].value;
}
}
}

return "";
}
I however found an incompatibility with Internet Explorer, when the
radio group name contains brackets. For example, the radio group name
is '1234[a]'. The Ms Script Debugger stops on btn.length, saying that
it is null or not an object. You may also want to know that it works
well in Firefox and Safari.
It is more likely that you have not observed a) that JS/ES identifiers must
not contain "[" and "]" (but only Unicode word characters), and so you have
to use bracket property access instead of dot property access, and b) that
in Firefox (and maybe also Safari) errors are logged in the background,
accessible via the JavaScript/Error Console.

http://jibbering.com/faq/#FAQ4_25
HTH

PointedEars
--
var bugRiddenCrashP ronePieceOfJunk = (
navigator.userA gent.indexOf('M SIE 5') != -1
&& navigator.userA gent.indexOf('M ac') != -1
) // Plone, register_functi on.js:16
Aug 31 '07 #2

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