Answers for "check each if is checked"

if checkbox is checked

if ($('#id_input').is(':checked')) { }

jquery in checkbox checked

// Check a checkbox
$(selector).prop('checked', true);
// Un-check a checkbox
$(selector).prop('checked', false);
// Determine if checked or not
isChecked = $(selector).prop('checked');

jquery check if checkbox is checked

if($('#on_or_off_checkbox').is(':checked')){
    //I am checked
}