Checking if a select value exists?

[Keiron Waites]

I'd like to do something like this, where the script checks to see if an
option exists:

if (document.formn ame.selectname. options["optionvalu e"]) != NULL) {
do something;
}

So it would return true if <option value="optionva lue"></option> existed.
Any ideas?

Thanks.

[Lasse Reichstein Nielsen]

Re: Checking if a select value exists?

"Keiron Waites" <webmaster@-NOSPAM-sharemonkey.com > writes:
[color=blue]
> I'd like to do something like this, where the script checks to see if an
> option exists:
>
> if (document.formn ame.selectname. options["optionvalu e"]) != NULL) {
> do something;
> }[/color]

You would have to iterate through the options.

function optionValueInde xOf(options,val ue) {
for (var i=0;i<options.l ength;i++) {
if (options[i].value == value) {
return i;
}
}
return -1;
}

then you can write:
if (
optionValueInde xOf(document.fo rms['formname'].elements['selectname'].options,
"optionvalu e") >= 0
) {
// do something;
}

/L
--
Lasse Reichstein Nielsen - lrn@hotpop.com
Art D'HTML: <URL:http://www.infimum.dk/HTML/randomArtSplit. html>
'Faith without judgement merely degrades the spirit divine.'