在Web服务中获取错误“'JSON'未定义”

Question

I am new to webservice and JSON. I am developing an application in asp.net which uses Webservices and JSON for Posting data in Ajax call to Server. In the below function PostData I am getting an error at:

 data: "{" + jsonObjectName + ":" + JSON.stringify(dataToSend) + "}",     as "json" is undefined. 

Here dataToSend is an object which contains my data
submitType is submit button id (in page this I have two submit buttons so, I called by id)

strMessagetoShow is text to show success or failure
strMethodToCall which method is called in Webservice?

function PostData(dataToSend, submitType, strMessagetoShow, strMethodToCall,        jsonObjectName) {   
 $.ajax({
    url: window.top.GetWsUrl() + "/" + strMethodToCall,
    type: "POST",
    dataType: "json",
    data: "{" + jsonObjectName + ":" + JSON.stringify(dataToSend) + "}",
    timeout: 30000,     
    contentType: "application/json; charset=utf-8",
    success: function (data) {
        return data;
    },
    error: function (result) {
        alert(result.status + ' ' + result.statusText);
    }
 });
}

Answer 1

It's JSON.stringify , and JSON.parse with capital letters (javascript is case sensitive).

Also, when using a variable in an object, you have to do:

var obj = {};
    obj[jsonObjectName] = JSON.stringify(dataToSend);

$.ajax({
    ....
    data: obj,
    timeout: 30000,     
    ....etc
});

Answer 2

Try this and see if helps:

function PostData(dataToSend, submitType, strMessagetoShow, strMethodToCall, jsonObjectName) {   
 $.ajax({
    url: window.top.GetWsUrl() + "/" + strMethodToCall,
    type: "POST",
    dataType: "json",
    data: {jsonObjectName : JSON.stringify(dataToSend)}, // or $.parseJSON(dataToSend)
    timeout: 30000,     
    contentType: "application/json; charset=utf-8",
    success: function (data) {
        return data;
    },
    error: function (result) {
        alert(result.status + ' ' + result.statusText);
    }
 });
}

What is changed here:

changed this :

  "{" + jsonObjectName + ":" + json.stringify(dataToSend) + "}"

to this:

 {jsonObjectName : JSON.stringify(dataToSend)}

Answer 3

Make sure you include the JSON library. See https://github.com/douglascrockford/JSON-js/blob/master/json2.js for the API.

JSON.stringify(value, replacer, space)