cascading dropdown in asp.net using ajax
$("#categoryDropDownList").change(function (e) {
$.ajax({
type: "POST",
url: "index.aspx/bindproduct",
contentType: "application/json; charset=utf-8",
data: '{"categoryId":"' + $(this).val() + '"}',
dataType: "json",
success: function (result, status, xhr) {
$("#productDropDownList").html(result.d);
},
error: function (xhr, status, error) {
alert("Result: " + status + " " + error + " " + xhr.status + " " + xhr.statusText)
}
});
});
$(document).ajaxStart(function () {
$("img").show();
});
$(document).ajaxStop(function () {
$("img").hide();
});