c# - SyntaxError: JSON.parse: unexpected character error unexpected token < -


i have html button "button-account" name in html body , want update aspx page ajax when user click button

i error in google chrom

syntaxerror: json.parse: unexpected character

and in fire fox

syntaxerror: json.parse: unexpected character

here's code

<script type="text/javascript" >     $(document).ready(function () {          $("#button-account").bind("click", "accountregister");          function accountregister() {             var waitobj = "<span class='wait' > <img  src='resource/images/loading.gif' alt='' /> </span>";             var user = $("[name='username']").val();             var pass = $("[name='password']").val();             var dataobj = {                 "username": user,                 "password": pass,             };             $.ajax({                 type: "post",                 url: "checkout.aspx/login",                 data: dataobj,                 contenttype: "application/json; charset=utf-8",                 datatype: "json",                 beforsend: function () {                     $(this).attr("disabled", "true");                     $(this).after(waitobj);                 },                 success: function (msg) {                     // replace div's content page method's return.                     alert("success");                     $("#checkout").slideup("slow");                     $("#payment-address").slidedown("slow");                 },                 error: function (msg) {                     alert("error");                 },                 complete: function () {                     $(this).attr("disabled", "false");                     $(".wait").remove();                 },             });         }       });      </script>

and here's webmethod

[webmethod]     public static string login()     {         //bool userisvalid = false;         //string username = "";         //string pass = "";         //membershipuser u = membership.getuser(username);         //pass = u.getpassword();         //if (userisvalid)         //{         //  //  returnashtml = "true";          //}         //else         //{         //    //returnashtml = "use not valid";          //}         javascriptserializer js = new javascriptserializer();         string result = js.serialize("{ a:'1' }");         return result;      }

and fiddler return 200 status. but return html. know mistake. how solve it?

any appriciate...

the server returns error-page (e.g. "<html> ...") instead of json response expected.

use fiddler, chrome's developer tools or similar tool check exact answer is, server returns.

in response comments:

check content of returned html page is. it's error caused server-side code (e.g. unhandled exception) or server-side configuration.


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