To be able to retrieve values from a ASP.NET CheckBoxList control or a group of HTML checkboxes, use the following jQuery:
$(document).ready(function () {
var checkboxValues = [];
$('#<%=MyCheckBoxList.ClientID %> input[type=checkbox]').click(function () {
$('input[type=checkbox]:checked').each(function () {
checkboxValues.push(this.value);
});
});
var values = checkboxValues.toString(); //Output Format: 1,2,3
});
If you do use this code snippet on a CheckBoxList, take a look that this article on how to create a custom CheckBoxList control with a value attribute.