jQuery AJAX function - Chrome throwing "Uncaught SyntaxError: Unexpected number"

Question

I have a number of clickable objects on the screen that represent objects within a piece of software being interfaced through a COM component.

When I click on an object I send the name of the object, the session ID and the command I want to run.

The code for the particular command that I'm trying to implement is a C# based ASP.NET page:

case "myClick":
                dynamic simObj = S8COM.get_SimObject(Request["id"]);
                responseData = "{name:" + simObj.Name.ToString() + ",countInRoutes:" + simObj.CountInRoutes.ToString() + ",countOutRoutes:" + simObj.CountOutRoutes.ToString() + ",index:" + simObj.Index.ToString() + ",capacity:" + simObj.Capacity.ToString() + ",completed:" + simObj.Completed.ToString() + ",routeOutMethod:" + simObj.RouteOutMethod.ToString() + "}";
                break;

This works fine for some objects, but not others, throwing an "Uncaught SyntaxError: Unexpected number" exception.

The JS I use to call this particular function is:

S8Web.Requestmanager.makeRequest({ data: { command: "myClick", id: aItem.id }, async: true, callback: function(data){
                        alert(data.CountInRoutes); //Do a vardump of the response
                        }});

A couple of responses as well, the first one works fine, whereas the second throws the Unexpected Number exception:

jsonp1319203225074({name:Start,countInRoutes:0,countOutRoutes:1,index:5,capacity:0,completed:0,routeOutMethod:4});

jsonp1319203225066({name:Process 1,countInRoutes:1,countOutRoutes:1,index:1,capacity:1,completed:0,routeOutMethod:1});

The only thing I can see that could possibly affect the outcome is the whitespace between "Process" and "1". Is that what is throwing this error?

Answer 1

You very well may simply be having a problem with improperly closed quotes.

Example:

<a href='#' onclick="doStuff('joe, '2844')">click here</a>

Since the first parameter isn't closed properly, it's being interpreted as 'joe, '. That leaves 2844' as the rest of the function call, without a leading quote. This circumstance will throw the Unexpected Number error.

Answer 2

Not sure if this will help you, but I was getting the same error in chrome and it was because of a "0" that trailed my json data:

{id: "6"}0

The 0 trailed the JSON data because I forgot to add an "exit;" in my PHP function that was handling the AJAX call. I also recommend running the same code in FireFox. FireFox a lot of the times has more informative error messages than chrome:

Error: SyntaxError: JSON.parse: unexpected non-whitespace character after JSON data

Good luck!