Question

elm = ('cbProducts' + suffix);
_ctl = document.forms[0].elements[elm];

This works when there are more than 1 checkbox in my list.
But when there are only 1, _ctl is undefined.

Would rather use jQuery if possible and have something like:

elm = ('cbProducts' + suffix).trim();
_ctl = $("form :input #cbProducts*");

Next step is assigning length of _ctl (_ctl.length) but it is null for only 1 checkbox in the elements collection.

Answer 1

So you want all inputs whose ids start with cbProducts?

$("form input[id^='cbProducts']");

or do you want inputs with cbProducts anywhere in the id?

_ctl = $("form input[id*='cbProducts']");

and of course _ctl.length will give you the number of elements in this set.

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EDIT

Based on your comment, if you know the id you’re looking for, instead of this:

$("form input[id='cbProducts' + elm]");

opt for this

$("#cbProducts" + elm);