How can get length on checked checkbox array javascript

Answer 1

var fobj = document.forms[0];

var c = 0;
for (var i = 0; i < formobj.elements.length; i++)
{
if (fobj.elements[i].type == "checkbox")
{
if (fobj.elements[i].checked)
{
c++;
}
}       
}

alert('Total Checked = ' + c);