Answers for "get checkbox value on checked jquery"

jquery checkbox is checked

//using plane javascript 
if(document.getElementById('on_or_off_checkbox').checked) {
    //I am checked
} 

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

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);
});

checkbox jquery checked

var isExpanded = $(this).attr('checked') == "checked";