How to get the value of checkboxlist in jquery

For the checboxlist create an attribute for each listitem
/*to get the checkbox value in jquery*/
foreach (ListItem li in cbHideColumns.Items)
{
li.Attributes.Add("someValue", li.Value);
}
How to get the value in jquery
$(".cbShowOrHideGvCols input[type=checkbox]").each(function () {
var checkbox = $(this)
if ($(ctrl).is(":checked")) {
var val = checkbox.parent().attr('someValue');
}
});