Prevent checkbox from unchecking when clicked (without disable or readonly)

Something like:

$("#test").on('change', function() {
    this.checked=!this.checked?!confirm('Really uncheck this one ?'):true;
});
​

FIDDLE

$("#checkboxID").on("click", function (e) {
    var checkbox = $(this);
    if (checkbox.is(":checked")) {
        // do the confirmation thing here
        e.preventDefault();
        return false;
    }
});