Checking existence of an object

[Paul THompson]

I am trying to see which of the elements of a
a) select list have been selected.
b) radio button have been checked.

I have set up a for loop

for (i=0;
!document._xedx _._cdm[i].selected;
i++) {}

This works fine, and terminates when the selected object is found.

How can I stop this if NO CHOICE has been selected? Then of course I
keep incrementing i, and get

f has no properties.

after it gets too big.

How do I test for the "object has no properties" error?

[kaeli]

Re: Checking existence of an object

In article <a7ef5268.03120 42148.3c4ab24b@ posting.google. com>,
paul@wubios.wus tl.edu enlightened us with...[color=blue]
> I am trying to see which of the elements of a
> a) select list have been selected.
> b) radio button have been checked.
>
> I have set up a for loop
>
> for (i=0;
> !document._xedx _._cdm[i].selected;
> i++) {}
>
> This works fine, and terminates when the selected object is found.
>[/color]
<snip>[color=blue]
> How do I test for the "object has no properties" error?
>[/color]


You don't. You use the length property instead of just incrementing
wildly. Use a boolean isChecked or something if you want to see if
anything was checked/selected.

For radios:
var boolean isChecked = false;
for (i=0; i<document.form name.radioname. length; i++)
{
if (document.formn ame.radioname[i].checked)
{
isChecked=true;
}
}

For selects
for (i=0; i<document.form name.selectname .options.length ; i++)
{
if (document.formn ame.selectname. options[i].selected)
{
isChecked=true;
}
}

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--
~kaeli~
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http://www.ipwebdesign.net/wildAtHeart

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