Answers for "on check of checkbox jquery"

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 check checkbox

$('.myCheckbox').prop('checked', true);
$('.myCheckbox').prop('checked', false);

checkbox is checked jquery

$(your_checkbox).is(':checked');

jquery checkbox checked

$("#general_no").prop( "checked", true);

check box jquery

if(document.getElementById('isAgeSelected').checked) {
    $("#txtAge").show();
} else {
    $("#txtAge").hide();
}

check checkbox by jquery

$('.myCheckbox')[0].checked = true;
$('.myCheckbox')[0].checked = false;