Javascript and only one Checkbox - undefined

Question

for (i = 0; i < document.checks.user.length; i++) //for all check boxes
{
    if (document.checks.user[i].checked == true )
    {
        document.checks.submit()         


        

Answer 1

if (document.getElementById('Checkbox1').checked) { /* do something */ }

if you want to loop a bunch of checkboxes, you could loop the input fields of your form, like:

var formNodes  = document.checks.getElementsByTagName('input');
for (var i=0;i