jcheckbox value get then checkbox is checked by id jquery code example
Example 1: jquery checkbox checked value
if ($('#check_id').is(":checked"))
{
// it is checked
}
Example 2: jquery get value checkbox checked
console.log($('input[name="locationthemes"]:checked').serialize());
//or
$('input[name="locationthemes"]:checked').each(function() {
console.log(this.value);
});