checked unched checkbox jqeury code example

Example 1: How to check whether a checkbox is checked in 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
}

Example 2: get unchecked checkbox jquery

if ($("#check_box_id").is(':checked')) {
  alert("checked");
}else{
  alert("unchecked");
}