check if checkbox is checked in jquery 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: How do I check whether a checkbox is checked in jQuery?

$('#' + id).is(":checked")

Example 3: jquery is checked

if ($('[name="your_input_checkbox_name"]').is(":checked"))
{
  // it is checked
} else {
  // it isn't checked	
}