object.length undefined.

[rxsid]

Hi all,

I've got a form (called form1) and a checkbox element (called listing).

When my js function is executed on click, the following elemLength displays 2 if 2 of the listing checkboxes are checked, or 5 if 5 are checked, etc.

var elemLength = manager.listing.length;

However...if only 1 listing checkbox is available to check and it's checked, elemLength returns undefined. Why? Why wouldn't it return 1?

 

[rxsid]

typo in above...should be:


var elemLength = form1.listing.length;

 

[rxsid]

More info:
The listing checkbox is generated via a php db query and can be 1 or more checkboxes....all named listing with some different value.

[javascript]
function doCheck() {
var elemLength = form1.listing.length;
alert(elemLength);
}
[/javascript]

echo "<input type=checkbox name=listing value="$someID">";

<input type="button" value="Do Check" onClick="return doCheck();">

if only 1 checkbox is generated, and it is checked...the elemLength var is undefined....even though there is one .listing that is checked. I can do an alert (form1.listing.value) and it does show the $someID.
if 2+ checkboxes are generated, and 2+ of them are checked...elemLength show's it's length (ie how many are checked).

 

[rxsid]

found the answer:

if (elemLength==undefined) {
elemLength=1;
if (document.form1.listing.checked) {
// we know the one and only is checked
}
} else {
for (var i = 0; i<elemLength; i++) {
if (form1.listing.checked) {
//do some work here.
}
}
}