Please check error comes at alert(XMLHttpRequest.response);
alert(XMLHttpRequest);
<script type="text/javascript" language="javascript">
$(document).ready(function () {
SearchText();
});
function SearchText() {
$(".autosuggest").autocomplete
({
source: function (request, response) {
$.ajax
({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "../Default.aspx/Mydata",
data: "{'username':'" + request.term + "'}",
dataType: "json",
success: function (data) {
response(data.d);
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(request.term);
alert(XMLHttpRequest.response);
alert(XMLHttpRequest);
alert(textStatus);
}
});
}
});
}
</script>