jQuery Ajax Post Json

Could you show us the returned response from the server that you can see in Fiddler? Does your JSON data look like

http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=?

Note the ({ in the beginning  and }) in the end.

The JSON data returns...
{"d":{"DataObject":{"LocationId":8,"EntityId":9,"EntityTypeId":2,"LocationName":"loc1","Address1":"1495 S. Wolf Rd.","Address2":null,"City":"Prospect Heights","ZipCode":"60070","ModifiedBy":2,"ModifiedDateTime":"\/Date(1279386329023)\/","CreatedBy":2,"CreatedDateTime":"\/Date(1279386329023)\/","LocationIdentifierId":null,"State":"IL","EntityState":1,"EntityKey":{"EntitySetName":"Location","EntityContainerName":"ResourceDBEntities","EntityKeyValues":[{"Key":"LocationId","Value":8}],"IsTemporary":false}},"Address1":"1495 S. Wolf Rd.","Address2":null,"City":"Prospect Heights","LocationName":"loc1","State":"IL","ZipCode":"60070","EntityId":9,"EntityTypeId":2,"HasChanged":false,"IsValid":true,"ValidationMessages":[]}}

What about :   data: { zipcode : $('#edtzipcode').val() },

(you post a json object and not a string)

function OnLookup() {
                $.ajax({
                    type: "POST",
                    url: "http://<%=HttpContext.Current.Request.Url.Host%>/services/LocationService.asmx/ChangeLocation",
                    data: { zipcode : $('#edtzipcode').val() },
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    success: function(data){
                        alert(data);
                        $('#curlocation').innerHTML(data[1].City + "," + data[1].State);
                        $('#edtzipcode').val("");
                    },
                });
            }

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Sorry new to this...my web service is expecting a string value which is what I am passing.

Leakim971 - When I changed to data : { zipcode : $('#edtzipcode').val() },
I get an error when I make my ajax call...
{"Message":"Invalid JSON primitive: zipcode.","StackTrace":"   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject()\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)\r\n   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)\r\n   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)\r\n   at System.Web.Script.Services.RestHandler.GetRawParamsFromPostRequest(HttpContext context, JavaScriptSerializer serializer)\r\n   at System.Web.Script.Services.RestHandler.GetRawParams(WebServiceMethodData methodData, HttpContext context)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.ArgumentException"}

success: function(data){
                        data = $.parseJSON(string);
                        $('#curlocation').innerHTML(data[1].City + "," + data[1].State);
                        $('#edtzipcode').val("");
                    },

yopu need to parse the JSON to actually use the JSON data.

hoep this helps

>I get an error when I make my ajax call...

Are using DataContract & Co ? What is the language used for the webservice ? VB.Net or C#.Net

shinug - the .ajax call automatically parses the json data.  After debugging, I found the solution.

data[1].City does not exist.  What i ended up doing is

success: function(data){
                        result = data.d;
                        $('#curlocation').innerHTML(result.City + "," + result.State);
                        $('#edtzipcode').val("");
                    },

There is no return value if the zipcode is valid.

Hope this helps

function OnLookup() {
                $.ajax({
                    type: "POST",
                    url: "http://<%=HttpContext.Current.Request.Url.Host%>/services/LocationService.asmx/ChangeLocation",
                    data: "{zipcode : '" +$('#edtzipcode').val()+"'}",
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    success: function OnLookupComplete(result) {
                        data = result.d;
                        $("#curlocation").text(data.City + "," + data.State);
                        $("#edtzipcode").val("");
                    },
                });
return true;
            }

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Shinug - #curlocation is the field I am populating, not the zipcode field.