Ajax调用Web服务给我消息=无效的Web服务调用，缺少参数的值：'json'。错误 [英] Ajax call to web service giving me message=invalid web service call, missing value for parameter: 'json'." error

问题描述

我收到错误。我无法通过下拉值。任何人帮助我这里是我的功能是



ajax：

i am getting error.i am not able to pass drop down values.can any one help me here is my functions are

ajax:

$(document).ready(function () {

    $("#ddlDistrict").change(function () {

        var selectedItem = $("#ddlDistrict").val();
        var ddlTaluk = $("#ddlTaluk");
        $("#ddlVillage").empty();
        Getalltaluksbydistrict(selectedItem);

    });

    $("#ddlTaluk").change(function () {
        var selectedItem = $("#ddlDistrict").val();
        var selectedItem1 = $("#ddlTaluk").val();
        var ddlDistrict = $("#ddlDistrict");
        var ddlTaluk = $("#ddlTaluk");
        GetVillagedetailsbyTaluk(selectedItem, selectedItem1);

    });

    //Getalldistricts();
    Getalldistricts();

    function Getalldistricts() {
        $.ajax({
            type: "POST",
            url: "School.asmx/Getalldistricts",
            data: "{}",
            contentType: "application/json;character=utf-8",
            dataType: "json",
            success: OnSuccess,
            error: OnError
        });

        function OnSuccess(data, status) {
            var obj = JSON.parse(data.d);
            $("#ddlDistrict").empty();
            $("#ddlDistrict").append('<option value="">--Select District--</option>');
            for (var i = 0; i < obj.length; i++) {
                $("#ddlDistrict").append('<option value="' + obj[i].districtna + '">' + obj[i].districtna + '</option>');
            }
        }
        function OnError(request, status, error) {
            alert(request.statusText);
        }
    }

    //Getalltaluksbydistrict(DistrictName)

    function Getalltaluksbydistrict(districtna) {
        $.ajax({
            type: "POST",
            url: "School.asmx/Getalltaluksbydistrict",
            data: "{'districtna':'" + districtna + "'}",
            contentType: "application/json;character=utf-8",
            dataType: "json",
            success: OnSuccess,
            error: OnError

        });

        function OnSuccess(data, status) {
            var obj = JSON.parse(data.d);
            $("#ddlTaluk").empty();
            $("#ddlTaluk").append('<option value="">--Select Taluk--</option>');
            for (var i = 0; i < obj.length; i++) {
                $("#ddlTaluk").append('<option value="' + obj[i].talukname + '">' + obj[i].talukname + '</option>');
                //alert(obj[taluknamekan]);
            }
        }
        function OnError(request, status, error) {
            alert(request.statusText);
        }
    }

    function GetVillagedetailsbyTaluk(districtna, talukname) {
        $.ajax({
            type: "POST",
            url: "School.asmx/GetVillagedetailsbyTaluk",
            data: "{'districtna':'" + districtna + "', "
                + "'talukname':'" + talukname + "' }",
            contentType: "application/json;character=utf-8",
            dataType: "json",
            success: OnSuccess,
            error: OnError

        });

        function OnSuccess(data, status) {
            var obj = JSON.parse(data.d);
            $("#ddlVillage").empty();
            $("#ddlVillage").append('<option value="">--Select Village--</option>');
            for (var i = 0; i < obj.length; i++) {
                $("#ddlVillage").append('<option value="' + obj[i].villagenam + '">' + obj[i].villagenam + '</option>');
                //alert(obj[taluknamekan]);
            }
        }
        function OnError(request, status, error) {
            alert(request.statusText);
        }
    }

    $('#btnsubmit').click(function () {
       
        var ddldistrictvalue =$("#ddlDistrict").val();
        var ddltalukvalue=$("#ddlTaluk").val();
        var ddlvillagevalue=$("#ddlVillage").val();
        var txtschcode=$("#txtschcode").val(); 
        var txtschname =$ ("#txtschname").val();
        var txtdistclu = $("#txtdistclu").val();
        var txtlowvalue = $("#txtlowvalue").val();
        var txtupvalue = $("#txtupvalue").val();
        var txtprpsec = $("#txtprpsec").val();
        var txtprpstud = $("#txtprpstud").val();
        var prpteach = $("#prpteach").val();
        var txtworkday = $("#txtworkday").val();
        var txtshftsch = $("#txtshftsch").val();
        var txtacainsp = $("#txtacainsp").val();
        var txtcrc = $("#txtcrc").val();
        var txtbrc = $("#txtbrc").val();
        var txtappro = $("#txtappro").val();
        var txtestyr = $("#txtestyr").val();
        var txtyor=$("#txtyor").val();
        var yorpri=$("#yorpri").val();
        var ddlloct = $("#ddllocat").val();

        insertdetails(ddldistrictvalue, ddltalukvalue, ddlvillagevalue, txtschcode, txtschname, txtdistclu, txtlowvalue,
           txtupvalue, txtprpsec, txtprpstud, prpteach, txtworkday, txtshftsch, txtacainsp, txtcrc, txtbrc, txtappro, txtestyr,
           txtyor, yorpri, ddlloct);
    });

    function insertdetails(ddldistrictvalue, ddltalukvalue, ddlvillagevalue, txtschcode, txtschname, txtdistclu, txtlowvalue,
           txtupvalue, txtprpsec, txtprpstud, prpteach, txtworkday, txtshftsch, txtacainsp, txtcrc, txtbrc, txtappro, txtestyr,
           txtyor, yorpri, ddlloct) {
      

        $.ajax({
            type: 'POST',
            contentType: "application/json; charset=utf-8",
            url: "School.asmx/insertschooldetails",
            data: "{'districtna':'" + ddldistrictvalue + "','talukname':'" + ddltalukvalue + "','villagenam':'" + ddlvillagevalue + "',"
                + "'schcd':'" + txtschcode + "','districtna':'" + txtschname + "','distcrc':'" + txtdistclu + "',"
                + "'lowclass':'" + txtlowvalue + "','highclass':'" + txtupvalue + "','ppsrc_yn':'" + txtprpsec + "',"
                + "'ppstudent':'" + txtprpstud + "','ppteacher':'" + prpteach + "','workdays':'" + txtworkday + "',"
                 + "'schshi_yn':'" + txtshftsch + "','noinspect':'" + txtacainsp + "','visitscrc':'" + txtcrc + "',"
                 + "'visitsbrc':'" + txtbrc + "','approachby':'" + txtappro + "','estdyear':'" + txtestyr + "',"
                 + "'yearrecog':'" + txtyor + "','yearupgrd':'" + yorpri + "','rururb':'" + ddlloct + "'}",
            async: false,
            success: function (response) {

                alert("Record saved successfully..!!");
            },
            error: function () {
                alert("Error");
            }
        });
    }
 

});

webservices：

webservices:

[WebMethod]
      public String insertschooldetails(String ddlDistrict, String ddlTaluk, String ddlVillage,
               String txtschcode, String txtschname, String txtdistclu, Int32 txtlowcl, Int32 txtupcl, String txtprpsec, String txtprpstud, String prpteach, String txtworkday, String txtshftsch, String txtacainsp, String txtcrc, String txtbrc,
               String txtappro, String txtestyre, String txtyor, String yorpri, String ddllocat)
      {
          DataTable dt = SchoolDetailsBAL.insertschooldetails( ddlDistrict, ddlTaluk, ddlVillage,
                txtschcode, txtschname, txtdistclu, txtlowcl, txtupcl, txtprpsec, txtprpstud, prpteach, txtworkday, txtshftsch, txtacainsp, txtcrc, txtbrc,
                txtappro, txtestyre, txtyor, yorpri,  ddllocat);
          return JsonConvert.SerializeObject(dt);
      }

我尝试过：



i尝试使用JSON.stringify .still我得到同样的错误

What I have tried:

i have tried with JSON.stringify .still i am getting same error

推荐答案

（document）.ready（function（）{

(document).ready(function () {

（＃ddlDistrict）。change（function（）{

var selectedItem =

("#ddlDistrict").change(function () { var selectedItem =

（＃ddlDistrict ）.val（）;
var ddlTaluk =

("#ddlDistrict").val(); var ddlTaluk =

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