Jquery Ajax Posting json to webservice

Question

I am trying to post a JSON object to a asp net webservice   My json looks like this   var markers      markers          position    128 3657142857143    markerPosition    7          position    235 1944023323615    markerPosition    19          position    42 5978231292517    markerPosition    -3          I am using the json2 js to stringyfy my json object   and i am using jquery to post it to my webservice       ajax           type   POST           url    webservices PodcastService asmx CreateMarkers           data  markers          contentType   application json  charset utf-8           dataType   json           success  function data  alert data             failure  function errMsg                alert errMsg                     I am getting the following error    Invalid JSON primitive   I have found a bunch of posts relating to this and it seems to be a really common problem but nothing i try fixes the issue   When firebug what is being posted to the server it looks like this      markers 5B0 5D 5Bposition 5D 128 3657142857143 amp markers 5B0 5D 5BmarkerPosition 5D 7 amp markers 5B1 5D 5Bposition 5D 235 1944023323615 amp markers 5B1 5D 5BmarkerPosition 5D 19 amp markers 5B2 5D 5Bposition 5D 42 5978231292517 amp markers 5B2 5D 5BmarkerPosition 5D -3   My webservice function that is being called is    WebMethod  public string CreateMarkers string markerArray        return  received markers

User · Answer

I have encountered this one too and this is my solution.

If you are encountering an invalid json object exception when parsing data, even though you know that your json string is correct, stringify the data you received in your ajax code before parsing it to JSON:

$.post(CONTEXT+"servlet/capture",{
        yesTransactionId : yesTransactionId, 
        productOfferId : productOfferId
        },
        function(data){
            try{
                var trimData = $.trim(JSON.stringify(data));
                var obj      = $.parseJSON(trimData);
                if(obj.success == 'true'){ 
                    //some codes ...

User · Answer

I have query       login-button   click function e   alert  hiii             var username       username-field   val            var password       username-field   val             alert username           alert  password    password              var markers      userName     admin   password     admin123              ajax               type   POST               url  url                 The key needs to match your method s input parameter  case-sensitive               data  JSON stringify markers               contentType   application json  charset utf-8               dataType   json               success  function data  alert  got the data  data                 failure  function errMsg                    alert errMsg                                        I m posting the the login details in json and getting a string as  Success  but I m not getting the response

User · Answer

You mentioned using json2 js to stringify your data  but the POSTed data appears to be URLEncoded JSON  You may have already seen it  but this post about the invalid JSON primitive covers why the JSON is being URLEncoded  I d advise against passing a raw  manually-serialized JSON string into your method   ASP NET is going to automatically JSON deserialize the request s POST data  so if you re manually serializing and sending a JSON string to ASP NET  you ll actually end up having to JSON serialize your JSON serialized string  I d suggest something more along these lines  var markers       quot position quot    quot 128 3657142857143 quot    quot markerPosition quot    quot 7 quot                       quot position quot    quot 235 1944023323615 quot    quot markerPosition quot    quot 19 quot                       quot position quot    quot 42 5978231292517 quot    quot markerPosition quot    quot -3 quot         ajax       type   quot POST quot       url   quot  webservices PodcastService asmx CreateMarkers quot          The key needs to match your method s input parameter  case-sensitive       data  JSON stringify   Markers  markers         contentType   quot application json  charset utf-8 quot       dataType   quot json quot       success  function data  alert data         error  function errMsg            alert errMsg              The key to avoiding the invalid JSON primitive issue is to pass jQuery a JSON string for the data parameter  not a JavaScript object  so that jQuery doesn t attempt to URLEncode your data  On the server-side  match your method s input parameters to the shape of the data you re passing in  public class Marker     public decimal position   get  set      public int markerPosition   get  set        WebMethod  public string CreateMarkers List lt Marker gt  Markers      return  quot Received  quot    Markers Count    quot  markers  quot      You can also accept an array  like Marker   Markers  if you prefer   The deserializer that ASMX ScriptServices uses  JavaScriptSerializer  is pretty flexible  and will do what it can to convert your input data into the server-side type you specify

User · Answer

I tried Dave Ward s solution  The data part was not being sent from the browser in the payload part of the post request as the contentType is set to  application json   Once I removed this line everything worked great   var markers       position    128 3657142857143    markerPosition    7                        position    235 1944023323615    markerPosition    19                        position    42 5978231292517    markerPosition    -3         ajax        type   POST       url    webservices PodcastService asmx CreateMarkers          The key needs to match your method s input parameter  case-sensitive       data  JSON stringify   Markers  markers         contentType   application json  charset utf-8       dataType   json       success  function data  alert data         failure  function errMsg            alert errMsg

User · Answer

markers is not a JSON object  It is a normal JavaScript object  Read about the data  option   Data to be sent to the server  It is converted to a query string  if not already a string     If you want to send the data as JSON  you have to encode it first  data   markers  JSON stringify markers    jQuery does not convert objects or arrays to JSON automatically   But I assume the error message comes from interpreting the response of the service  The text you send back is not JSON  JSON strings have to be enclosed in double quotes  So you d have to do  return  quot   quot received markers  quot  quot    I m not sure if your actual problem is sending or receiving the data

User · Answer

Please follow this to by ajax call to webservice of java var param     feildName  feildValue    JSON stringify  data   param      ajax               dataType       json               type           POST               contentType    application json               url             lt   request getContextPath    gt  rest priceGroups               data          JSON stringify  data   param                success       function res                    if res success    true                           alertMessage   html  Successfully price group created    addClass  alert alert-success fade in                            alertMessage   removeClass  alert-danger alert-info                        initPriceGroupsList                        priceGroupId   0                      resetForm                                                                                         else                                                    alertMessage   html res message  addClass  alert alert-danger fade in                                          alertMessage   alert                             window setTimeout function                              alertMessage   removeClass  in                        document getElementById  message   style display    none                      5000

[jquery] Jquery Ajax Posting json to webservice

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