//using plane javascript
if(document.getElementById('on_or_off_checkbox').checked) {
//I am checked
}
//using jQuery
if($('#on_or_off_checkbox').is(':checked')){
//I am checked
}if ($('#check_id').is(":checked"))
{
// it is checked
}$(".checkbox").change(function() {
if(this.checked) {
//Do stuff
}
});
//For jQuery 1.6 and above
$('#myCheckBoxID').prop('checked', true);
//For jQuery Before 1.6
$('#myCheckBoxID').attr('checked','checked');console.log($('input[name="locationthemes"]:checked').serialize());
//or
$('input[name="locationthemes"]:checked').each(function() {
console.log(this.value);
});$("checkbox").is(":checked")