Answers for "jquery checkbox checked listener"

jQuery is checkbox 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 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');

checkbox is checked jquery

$("#out_of_stock_toggle").click(function(){
      if($(this).is(':checked')){
        //show oos
        $(".oos").fadeIn();
      }else{
        //hide oos
        $(".oos").fadeOut();
      }
    });