jquery check if checkbox is checked by id 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: check whether a checkbox is checked in jQuery

if ($('#grepperRocks').is(':checked')) {
	// this checkbox is checked
}

Example 4: jquery check if checkbox is checked

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

Example 5: checkbox is checked jquery

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

Example 6: 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
}