Ajax object POST data error

swami

For EXACTLY the same request done via $.ajax(), I get a successful request (200), but via the datatables ajax object I get 400. Our server is giving the following error:

{"code":99998,"message":"Can not deserialize instance of org.isha.mdm.api.vo.ContactSearchVO out of START_ARRAY token\n at [Source: java.io.ByteArrayInputStream@ed968aa; line: 1, column: 1]"}

Why is there a difference? Is datatables somehow changing the data being passed?

var x = JSON.stringify(
      {"matchValues": {
          "name": "santosh",
          "phone": "",
          "email": "san1@gmail.com",
          "gender":"MALE"
        },
        "start":1,
        "pageSize":10}
    );
    
    $('mytable')
      .dataTable({
        ajax: {
          url: "https://qa-api.isha.in/v1/in/contact/api/contact/search",
          method: "POST",
          contentType: "application/json",
          headers: {
            "X-Application-ID": "2",
            "X-Request-ID": "23455",
            "From": "test2@xyz.com"
          },
          "data": x,
          dataSrc: "result",
          dataType: "json",
          processData: false,
        }

swami

I think this is a datatables bug.

When I use the browser debugger, I can see that the json object is being recognised with reguar $.ajax() call:

Request payload
{matchValues: {name: "santosh", email: "san1@gmail.com", gender: "MALE"}, start: 1, pageSize: 10}

but not when passed as datatables ajax parameter:

Request Payload
[object Object]

allan

You are correct - DataTables currently doesn't accept a string for the ajax option as can be seen in the documentation. Instead, use a function which will extend the object DataTables uses and then stringify that.

    "data": function ( d ) {
      $.extend( d, myJsonObject );
      return JSON.stringify( d );
    }

DataTables can't accept a string here as there are occasions it needs to send data to the server. It could parse a JSON string, but if it isn't JSON in the string, anything it does would probably be wrong.

Regards,
Allan

swami

Hi Allan,

Thanks very much for the quick response. That's helped me a lot! (I think you meant the (ajax.data) option).

Just a thought... maybe you could allow string to be parsed as JSON if ajax.contantType = "application/json". That might be more intuitive for ppl with the same requirement.

Kind Regards

Swami