I'm trying to pass Json to my View using ViewData
Controller
ViewData("JsonRegionList") = Json(RegionService.GetActiveRegions())
view
$("input#UserRegion").autocomplete({
source:"<%: ViewData("JsonRegionList").ToString %>",
minLength: 3,
but the problem I'm running into is the output source looks like
$("input#UserRegion").autocomplete({
source:"System.Web.Mvc.JsonResult",
minLength: 3,
which is obviously not right. Am I missing something basic?
The Json() controller method returns a JsonResult, which isn't the same as a JSON string. The JsonResult holds data, but the data is actually written directly to the response when the View Engine calls JsonResult.ExecuteResult(). That's all probably more information than you want there - the point is that calling Json() in a controller won't give you a string of JSON.
If you just want to turn your data into a JSON string, you can use the JavaScriptSerializer, which is what the Json() method uses internally:
JavaScriptSerializer serializer = new JavaScriptSerializer();
ViewData["JsonRegionList"] = serializer.Serialize(jsonRegionList);
Related
I am using .NET 4.0, MVC 4, Web API. I have following data structure:
Dictionary<Actor, Int32> TopActorToMovieCount = new Dictionary<Actor, Int32>(10);
And following entry in WebApiConfig:
config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
In my Controller, I am returning TopActorToMovieCount this way:
[HttpGet]
public HttpResponseMessage HighestMovies()
{
return Request.CreateResponse(HttpStatusCode.OK, MvcApplication.TopActorToMovieCount);
}
But the JSON output it is giving is:
{"api.Models.Actor":137,"api.Models.Actor":125,"api.Models.Actor":99,"api.Models.Actor":96,"api.Models.Actor":83,"api.Models.Actor":82,"api.Models.Actor":81,"api.Models.Actor":79,"....
Why it is not giving JSON structure for object of Actor?
I am sure that I am missing something, bout couldn't figure out. I tried adding following, but it didn't work:
config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
PS: When I switch to XML output, it works fine.
See similar question here: Not ableTo Serialize Dictionary with Complex key using Json.net
In this case, you are using "Actor" as the Key of your dictionary. Dictionary stores key/value pairs. So when creating the JSON response, it interprets the "Actor" as a key which is converted to a string, and the "Int32" as the value thus giving you
{"api.Models.Actor":137} or {key:value}
because
Actor.ToString() would result in "api.Models.Actor"
Here's a link to the definition of Dictionary: https://msdn.microsoft.com/en-us/library/xfhwa508(v=vs.110).aspx
I want to write an API ReST endpoint, using Spring 4.0 and Groovy, such that the #RequestBody parameter can be any generic JSON input, and it will be mapped to a Groovy JsonSlurper so that I can simply access the data via the slurper.
The benefit here being that I can send various JSON documents to my endpoint without having to define a DTO object for every format that I might send.
Currently my method looks like this (and works):
#RequestMapping(value = "/{id}", method = RequestMethod.PUT, consumes = MediaType.APPLICATION_JSON_VALUE)
ResponseEntity<String> putTest(#RequestBody ExampleDTO dto) {
def json = new groovy.json.JsonBuilder()
json(
id: dto.id,
name: dto.name
);
return new ResponseEntity(json.content, HttpStatus.OK);
}
But what I want, is to get rid of the "ExampleDTO" object, and just have any JSON that is passed in get mapped straight into a JsonSlurper, or something that I can input into a JsonSlurper, so that I can access the fields of the input object like so:
def json = new JsonSlurper().parseText(input);
String exampleName = json.name;
I initially thought I could just accept a String instead of ExampleDTO, and then slurp the String, but then I have been running into a plethora of issues in my AngularJS client, trying to send my JSON objects as strings to the API endpoint. I'm met with an annoying need to escape all of the double quotes and surround the entire JSON string with double quotes. Then I run into issues if any of my data has quotes or various special characters in it. It just doesn't seem like a clean or reliable solution.
I open to anything that will cleanly translate my AngularJS JSON objects into valid Strings, or anything I can do in the ReST method that will allow JSON input without mapping it to a specific object.
Thanks in advance!
Tonya
I have a method in my main controller that return a string that I want to render as JSON.
So I am importing "import grails.converters.JSON" and calling
myMethod() as JSON
, and it works fine. But when I need to get some details of the json response in my integration test.
So in my integration test I have:
void testfoo() {
def bar = controller.myMethod();
def bar.name; //fails
JSON.parse(bar.toString()).name; // doesn't fail
....
..
}
any idea why I need to convert it to a string and then again to a JSON, since it already a JSON?
The value you get back from your method is a grails.converters.JSON, which is not a directly accessible JSON tree as such, but simply an object that knows how to serialize itself as JSON when required. If you want direct access to the JSON tree structure then you need to tell the grails.converters.JSON object to serialize itself and then pass that JSON to JSON.parse to turn it into a JSONElement (or one of its subclasses, in this case presumably a JSONObject).
I'm trying to integrate jQuery validation engine with my MVC project to perform inline validation. I have a field inside a jQuery form which is calling to an MVC controller and expects a JSON response. According this article written by the plugin's author...
Now this will send the field in ajax to the defined url, and wait for
the response, the response need to be an array encoded in json
following this syntax: ["id1", boolean status].
So in php you would do this: echo json_encode($arrayToJs);
How to achieve this in ASP.NET MVC4?
My current controller looks like this.
public JsonResult FunctionName(string fieldValue)
{
return Json((new { foo = "bar", baz = "Blech" }), JsonRequestBehavior.AllowGet);
}
The response body shows that it returns key value pairs that look like this
{"foo":"bar","baz":"Blech"}
How can I return JSON in the expected format?
The square brackets indicate an array within a JSON object.
See this article: http://www.w3schools.com/json/json_syntax.asp
This test code:
return Json(new object[] { "id1", false }, JsonRequestBehavior.AllowGet);
should return:
["id1",false]
If you want to return an array within the json, which i think you do. Then you can return a Dictionary. Your not seeing an array in the json output now because of the anonymous type you are passing in is two key values.
public JsonResult MyMethodName(string name)
{
IDictionary<string, bool> myDict = LoadDictionaryFromSomewhere();
return Json(myDict, JsonRequestBehaviour.AllowGet);
}
I am trying to access a REST Service in my MVC application.I am calling getJSON method to get the data from a controller which internally calls the REST service which returns data in json format.But I am getting the a lot of "\ in my output of DownLoadString method and my return Json is not returning proper JSON data and hence my client side script is not able to access the JSON properties.
My Script in my view is
$.getJSON("#Url.Action("GetManufacturers", "Home")",function(data){
console.debug("Status is : "+data.Status)
});
My Action method looks like this
public ActionResult GetManufacturers()
{
string restURL ="http://mytestserver/myapi/Manufacturers";
using (var client = new WebClient())
{
var data = client.DownloadString(restURL);
//data variable gets "\" everywhere
return Json(data,JsonRequestBehavior.AllowGet);
}
}
I used visual studio breakpoints in my action method and i am seeing a lot of \"
And i checked what is coming out to my getJSON callback and the JSON tab is empty.
But my response tab has content like this
I belive if there is no \", i would be able to parse it nicely.
I used fiddler to see whether i am getting correct (JSON format) data from my REST service and it seems fine.
Can anyone help me to tackle this ? I would like to return proper JSON from my action method. Sometime i may want to read the json properties in the C# code itself. I saw some example of doing it with DataContractJsonSerializer. But that needs a concrete type to be converted to. I don't want to do that. because other clients would also access my RESTService and how will expect them to write a fake entity for this ?
You need to return the data as is:
public ActionResult GetManufacturers()
{
string restURL ="http://mytestserver/myapi/Manufacturers";
using (var client = new WebClient())
{
var data = client.DownloadString(restURL);
return Content(data, "application/json");
}
}