请求的json解析失败，解析json文档时出错

Question

var objectData ={
             "emailAdress" :  document.getElementById('emailAddress').value ,
              "password":     document.getElementById('password').value }

 var objectDataString = JSON.stringify(objectData);
 alert(objectDataString);


   var url = "url";
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    alert('connected..');
    }
  };
xmlhttp.open("POST",url,true);
xmlhttp.send(objectDataString);

      $.ajax({

            type: "POST",
            URL:"login.php",
            contentType:"application/json",
            CrossDomain:true,
            data:  JSON.stringify(objectData),       
            dataType: 'json',
            success: function (data) {

                alert("success");
                var ret = jQuery.parseJSON(data);
                alert(ret);

I have login form which contains userid and password.i have to convert that user entered info into json and send it to the server.but getting json parsed error .unable to find the error.please tell me where im doing wrong..?im trying from so many hours but unable to find .

Answer 1

Ignoring the XHR code, and just looking at the ajax call:

1. There's no CrossDomain option. There's a crossDomain option, though. (JavaScript is case-sensitive.) You probably don't want that option at all, though, with the URL you're giving.

2. You're telling jQuery that the data coming back is JSON. That means jQuery will parse it for you before giving you the data argument to your success function. You don't need (or want) to call JSON.parse on it, that's already been done for you. data will be parsed data.