Answers for "jquery check or uncheck checkbox"

how to uncheck a checkbox in jquery

$("#myCheckBox").prop("checked", false);

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 set checkbox

//jQuery 1.6+ use:
$('.checkboxClass').prop('checked', true);
//jQuery 1.5.x and below use:
$('.checkboxClass').attr('checked', true);

jquery uncheck checkbox

$('#myCheckbox').prop('checked', true); // Checks it
$('#myCheckbox').prop('checked', false); // Unchecks it