ajax

jquery ajax call webservice: return json

<script type="text/javascript">
    $(function () {

        $("#btn").click(function () {

            $.ajax({
                type: 'POST',
                dataType: "json",
                contentType: 'application/json; charset=utf-8',
                url: '@Url.Content("~/services/WebService1.asmx/search")',
                data: "{ 'id': '1' }",
                success: function (data, textStatus, xhr) {
                    var rows = $.map(jQuery.parseJSON(data.d), function (item) {
                        return ('<tr><td>' + item.name + '</td></tr>');
                    }).join('');
                    $("#searchresults").html("<table>"+rows+"</table>");
                },
                error: function (xhr, textStatus, errorThrown) {
                    alert("erropr");
                }
            });
        });

    });
</script>

webservice return:

            return "[{\"name\":\"this is name\",\"value\":\"This is value\"},{\"name\":\"this is name2\",\"value\":\"This is value2\"}]";

//if webservice return list<T> then use data,not data.d

jquery ajax call webservice . return xml

<script type="text/javascript">
    $(function () {

        $("#btn").click(function () {

            $.ajax({
                type: 'POST',
                dataType: "xml",
                contentType: 'application/json; charset=utf-8',
                url: '@Url.Content("~/services/WebService1.asmx/getDS")',
                data: "{ 'id': '1' }",
                success: function (data, textStatus, xhr) {
                    try {
                        $(xhr.response).find("Table1").each(function () {
                            $('#searchresults').append($(this).find("ID").text() + " <-->" + $(this).find("Value").text());
                        });
                    }
                    catch (e) {
                        alert(e);
                        return;
                    }
                },
                error: function (xhr, textStatus, errorThrown) {
                    alert("erropr");
                }
            });
        });

    });
</script>

webservice return:

[WebMethod]
        [System.Web.Script.Services.ScriptMethod(ResponseFormat = System.Web.Script.Services.ResponseFormat.Xml)]
        public DataSet getDS(string id)
        {
            DataSet ds = new DataSet("table");
            DataTable dt = new DataTable();
            dt.Columns.Add("ID", Type.GetType("System.String"));
            dt.Columns.Add("Value", Type.GetType("System.String"));
            DataRow dr = dt.NewRow();
            dr["ID"] = "1";
            dr["Value"] = "你好1";
            dt.Rows.Add(dr);
            dr = dt.NewRow();
            dr["ID"] = "2";
            dr["Value"] = "新年好";
            dt.Rows.Add(dr);
            ds.Tables.Add(dt);
            return ds;

        }

jquery ajax call ashx:

<script type="text/javascript">
    $(function () {

        $("#btn").click(function () {

            $.ajax({
                type: 'POST',
                dataType: "json",
                contentType: 'application/json; charset=utf-8',
                url: '@Url.Content("~/services/WebService1.asmx/search")',
                data: "{ 'id': '1' }",
                success: function (data, textStatus, xhr) {
                    var rows = $.map(data, function (item) {
                        return ('<tr><td>' + item.name + '</td></tr>');
                    }).join('');
                    $("#searchresults").html("<table>"+rows+"</table>");
                },
                error: function (xhr, textStatus, errorThrown) {
                    alert("erropr");
                }
            });
        });

    });
</script>

ashx return:

 public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";

            JavaScriptSerializer json = new JavaScriptSerializer();
            string value = json.Serialize(new Person { name = "aaa", age = "bbb" });


            //context.Response.Write(value);
            //context.Response.Write("{'name': 'firstname', 'value': 'Hello'}");
            context.Response.Write("[{\"name\":\"this is name\",\"value\":\"This is value\"},{\"name\":\"this is name2\",\"value\":\"This is value2\"}]");
            context.Response.End();
        }