Answers for "check jquery checkbox"

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
}

Setting “checked” for a checkbox with jQuery

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

jquery set checkbox

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

checkbox jquery checked

var isExpanded = $(this).attr('checked') == "checked";