How to Uncheck a Checkbox in jQuery

Use this to how to uncheck a checkbox in jQuery:

//jQuery 1.6+ use

$('.checkbox').prop('checked', true);  //false for uncheck

//jQuery 1.5.x and below use

$('.checkbox').attr('checked', true);  //false for uncheck

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

Alternate:

if ($("#checkBoxId").is(':checked')) {
   alert("checked");
} else {
   alert("unchecked");
}

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