Json return form Controller are not working

Question

I need to get json object from string and return it from controller.

In my Controller I have second thing:

    [HttpGet]
    public JsonResult GetPageFilters()
    {
        ...
        ...

        if (settings != null)
        {
            var data = JsonConvert.DeserializeObject(settings.Filters); //Filter is string with json

            return Json(data);
        }
        else
        {
            return null;
        }            
    }

and this in my view:

    var filterOption;

    $.get('Library/Books/GetPageFilters', null, function(data) {
        filterOption = data;
    }, "json");

Controller are called normally, string is deserialized to object... but function(data) is not working. Nothing are happening there and I cant get why.

What am I missing?

EDIT:

Looks like string to json went wrong. I tried to save it in database what looks fine i guess, but read it properly is a problem to me.

function UpdateFilter() {

    var filterOption = {
        "filterTarget": "Books",
        "filters": [
            { "cancelled": $("#showCancelledFilter").is(':checked') },
            { "completed": $("#showAllFilter").is(':checked') }
        ],
        "page": page,
        "sorting": sorting
    };

    var url = "Library/Books/UpdateFilter";
    $.post(url, { pageFilters: JSON.stringify(filterOption) }, function (data) { });
}

seems working fine, but as I told already, from string to json is not ok for some reason.

What do you mean by 'nothing is happening'? Do you get inside the success handler? — Vsevolod Goloviznin
– Vsevolod Goloviznin, Commented Aug 18, 2015 at 8:06
Because its a GET method. You need return Json(data, JsonRequestBehavior.AllowGet); — user3559349
– user3559349, Commented Aug 18, 2015 at 8:06
You could make it [HttpPost], but you dont seem to be changing any data, so a GET seems more appropriate — user3559349
– user3559349, Commented Aug 18, 2015 at 8:12
Thanks, could you please make your comment as an answer so I can mark it? Aslo... I got data in view... but looks loke deserializing went wrong (I got a 4 Arrays (array on each field in json and empty array inside each array)... I will describe in edit, how i tried to dave json in database and then get it from string. — Olegs Jasjko
– Olegs Jasjko, Commented Aug 18, 2015 at 8:18

Community · Accepted Answer · 2017-05-23 11:51:24Z

2

Your method is marked with the [HttpGet] which means you need to change you method to

return Json(data, JsonRequestBehavior.AllowGet);

By default, the JsonRequestBehavior is set to DenyGet

You can read more about this in the answers to this question

edited May 23, 2017 at 11:51

CommunityBot

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answered Aug 18, 2015 at 8:26

user3559349

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2 Comments

Olegs Jasjko Over a year ago

Thanks. If you have some time, could you please view the edit where is described change json to string and its writing to database, because that I received after deserialization is not what I needed. :(

Olegs Jasjko Over a year ago

Eh, well, will make it as another question :)

Muks · Accepted Answer · 2015-08-18 08:25:20Z

1

You are missing JsonRequestBehavior.AllowGet

[HttpGet]
    public JsonResult GetPageFilters()
    {
        ...
        ...

        if (settings != null)
        {
            var data = JsonConvert.DeserializeObject(settings.Filters); //Filter is string with json

            return Json(data, JsonRequestBehavior.AllowGet);  
        }
        else
        {
            return Json(null, JsonRequestBehavior.AllowGet);  
        }            
    }

answered Aug 18, 2015 at 8:25

Muks

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