Answers for "if checkbox checked get value jquery"

check if checkbox is checked jquery

//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
}

if checkbox checked jquery value 1

var checked = '0';  if($('#checkbox').prop('checked')){ checked = '1'; }