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问题:

I am using a Jquery Token Input plugin. I have tried to fetch the data from the database instead of local data. My web service returns the json result is wrapped in xml:

 <?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">[{"id":"24560","name":"emPOWERed-Admin"},{"id":"24561","name":"emPOWERed-HYD-Visitors"}]</string>

I have checked in the site http://loopj.com/jquery-tokeninput/ which says that the script should output JSON search results in the following format:

[
    {"id":"856","name":"House"},
    {"id":"1035","name":"Desperate Housewives"}
]

Both seems to be the same,but still i m not getting the items displayed in my page.

I am posting my code also. My Js code: DisplayTokenInput.js

 $(document).ready(function() {
     $("#textboxid").tokenInput('PrivateSpace.asmx/GetDl_info', {

            hintText: "Type in DL Name", theme: "facebook",
            preventDuplicates: true,
            searchDelay: 200

            });
    });

My web-service code:

[WebMethod]

    [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
     public string GetDl_info(string q)
    {
        string dl_input = string.Empty;
        DataSet ds;
        PSData ObjDl = new PSData();
        ds = ObjDl.GetDistributionList(q);

        List<DistributionList> DLObj = new List<DistributionList>();


        foreach (DataRow datarow in ds.Tables[0].Rows)
        {
            DistributionList dl_list = new DistributionList();
            dl_list.id = Convert.ToString(datarow["id"]);
            dl_list.name = Convert.ToString(datarow["name"]);

            DLObj.Add(dl_list);
        }

        dl_input = JsonConvert.SerializeObject(DLObj);

        return dl_input;

    }

 }
public class DistributionList
    {
        public string id { get; set; }
        public string name { get; set; }
    }

I am posting the head portion of aspx code to show the library files i have included:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title>Untitled Page</title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

   <link href="../Styles/jquery-ui-1.8.20.custom.css" rel="stylesheet" type="text/css" />
      <link href="../Styles/token-input.css" rel="stylesheet" type="text/css" />

    <link href="../Styles/token-input-facebook.css" rel="stylesheet" type="text/css" />

    <script src="Scripts/Lib/jquery-1.7.2.min.js" type="text/javascript"></script>  

    <script src="../Scripts/jquery.tokeninput.js" type="text/javascript"></script>--%>

    <script src="DisplayTokenInput.js" type="text/javascript"></script>
<head>

回答1:

You need to make sure that your request is a POST request. Not a get request. See this answer to find out more about why: How to let an ASMX file output JSON

回答2:

I would assume that the code for the plugin isn't setting the content-type for ajax requests to JSON, so you could do it yourself before the service call with $.ajaxSetup ie:

$.ajaxSetup({
  contentType: "application/json; charset=utf-8"
});

UPDATE: Apparently asmx services sometimes have issues with the 'charset=utf-8' portion, so if that doesn't work you could try just 'application/json'

UPDATE 2:

I don't think it's the contentType causing the issue, use the following to force a POST for ajax requests and see if this fixes it:

$.ajaxSetup({
  type: "POST", contentType: "application/json; charset=utf-8"
});

UPDATE 3:

There is a default setting inside the plugin you're using that can change the requests from GET to POST. See here on it's GitHub repo: jquery.tokeninput.js

and in your copy of the js file in the project, change the line:

var DEFAULT_SETTINGS = {
    // Search settings
    method: "GET",

var DEFAULT_SETTINGS = {
    // Search settings
    method: "POST",

I also assume that the plugin constructs the query in a way that ignores the global jquery ajax settings anyway, so you shouldn't need to include my earlier snippets anymore.