json convert? RSS

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  zhshqzyc

  Member

  419 Points

  524 Posts

  json convert?

  May 01, 2012 07:29 PM|LINK

  Hello, I have an ajax call that will return a boolean. But I found that it is not true, it returned a string. Please see what is wrong.

   

  function ValidateUserName() {
              $.ajax({ type: "POST",
                  url: "../myWebService.asmx/ValidateUserName",
                  data: "{'sname': '" + $("#<%=TextUserName.ClientID%>").val() + "'}",
                  contentType: "application/json; charset=utf-8",
                  dataType: "json",
                  async: false,
                  success: function (data) {
                      return data.d;
                  }
              });
          }
  
          function ValidateUserNameSubmitting() {
              var isValid = ValidateUserName();
              return isValid; // found it is undefined.
          }

  Thanks

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  Specs

  Member

  618 Points

  152 Posts

  Re: json convert?

  May 01, 2012 07:41 PM|LINK

  Is the web service returning a string or is it returning 'undefined' because there was an error?

  Add an error handler to your ajax call:

  $.ajax({ type: "POST",
                  url: "../myWebService.asmx/ValidateUserName",
                  data: "{'sname': '" + $("#<%=TextUserName.ClientID%>").val() + "'}",
                  contentType: "application/json; charset=utf-8",
                  dataType: "json",
                  async: false,
                  error: AjaxError,
                  success: function (data) {
                      return data.d;
                  }
              });
  
  
  
  AjaxError = function (jqXHR, textStatus, errorThrown) {
          alert(textStatus);
          alert(errorThrown);
      }

  
  
  

  *** If this post helps you, then Mark this post as Answer ***
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  zhshqzyc

  Member

  419 Points

  524 Posts

  Re: json convert?

  May 01, 2012 07:55 PM|LINK

  The web service returned a bool value. I used the code but no exception.

  function ValidateUserName() {
              $.ajax({ type: "POST",
                  url: "../UserNameWebService.asmx/ValidateUserName",
                  data: "{'strUsername': '" + $("#<%=TextUserName.ClientID%>").val() + "'}",
                  contentType: "application/json; charset=utf-8",
                  dataType: "json",
                  
                  async: false,
                  success: function (data) {
                      return data.d;
                  },
                  error: function (xhr, ajaxOptions, thrownError) {
                      alert(xhr.status);
                      alert(thrownError);
                  }
              });
          }

  
   

   

  • Edited by zhshqzyc on May 01, 2012 07:57 PM
  • Edited by zhshqzyc on May 01, 2012 08:09 PM
  • Edited by zhshqzyc on May 01, 2012 08:11 PM
• • Reply
  

  bruce (sqlwo...

  All-Star

  37594 Points

  5573 Posts

  Re: json convert?

  May 02, 2012 02:45 AM|LINK

  use fiddler to see the response from the server, and check if its valid json.

  bruce (sqlwork.com)
  • Marked as answer by Song-Tian - MSFT on May 07, 2012 08:40 AM