Add the onclick attribute using the selector with the "return false" value.
Because the readonly property is not working on the checkbox when clicking on it.
The below code is also not working when the checkbox attribute is readonly.
$('input[name="BeneficiariesList_code"][type="checkbox"][readonly="readonly"]').on("click",function (e) {
e.preventDefault();
return false;
});
In this line onclick is added by jQuery attr.
$("#BG2").attr("onclick","return false");
<input class="k-checkbox" name="ecode" value="Test" type="checkbox" id="BG2" onclick="return false">
