jquery checkbox is checked
snippet in javascript

jquery checkbox is checked

user9843

//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 checkbox checked value

user5488

if ($('#check_id').is(":checked"))
{
  // it is checked
}

jQuery check a radio button

user3619

// jQuery version 1.6 or above use:  
$("#myRadioID").prop("checked", true);
 
//jQuery versions below 1.6 use:
$("#myRadioID").attr('checked', 'checked');

checkbox is checked jquery

user195

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

check a checkbox jquery

user6358

$('#grepperRocks').prop('checked', true);

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

user4283

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