Answers for "jquery checkbox:checked value"

jquery set checkbox checked

//jQuery 1.6+ use
$('.checkbox').prop('checked', true);
//jQuery 1.5.x and below use
$('.checkbox').attr('checked', true);

jquery checkbox checked value

if ($('#check_id').is(":checked"))
{
  // it is checked
}

jquery get value checkbox checked

console.log($('input[name="locationthemes"]:checked').serialize());

//or

$('input[name="locationthemes"]:checked').each(function() {
   console.log(this.value);
});

jquery is checked

if ($('[name="your_input_checkbox_name"]').is(":checked"))
{
  // it is checked
} else {
  // it isn't checked	
}