Using JavaScript in MVC4 to implement JSon

Looking to integrate JavaScript into my project... I have data stored in a database...... Retrieving it using LinQ as shown below

 public List<SelectListItem> getTokens()
    {
        var tokens = from T in db.tokens select T;
        List<SelectListItem> items = new List<SelectListItem>();
        foreach (var t in tokens)
        {
          items.Add(new SelectListItem { Value = t.id.ToString(), Text = t.tname });
        }

        return items.ToList<SelectListItem>;
 }

Alternatively

 public string getTokens()
 {
  var tokens = from T in db.tokens select T;
  string s = "[";
        foreach (var t in tokens)
        {
            s += "{ id:" + t.id.ToString() + ", name: " + t.tname + "},";
        }
        s += "]";
        return s;
}

I am looking for a way to pass this string/list to my JS function like so...

$(document).ready(function() {
        $("#demo-theme").tokenInput([
            { id: 7, name: "Ruby" },
            { id: 11, name: "Python" },
            { id: 13, name: "JavaScript" },
            { id: 17, name: "ActionScript" },
            { id: 19, name: "Scheme" },
            { id: 23, name: "Lisp" },
            { id: 29, name: "C#" },
            { id: 31, name: "Fortran" },
            { id: 37, name: "Visual Basic" },
            { id: 41, name: "C" },
            { id: 43, name: "C++" },
            { id: 47, name: "Java" }],
            {theme: "ab"
        });
    });

I am seeking a solution to replace the initial list of items with my string/list... Or any other method to achieve this....

Answer №1

Close to achieving the desired outcome with your second approach, simply convert it to a JSON response without manual serialization.

public JsonResult obtainTokens()
{
    return Json(db.tokens.ToList(), JsonRequestBehavior.AllowGet);
}

Executing this will enable an AJAX request to deliver the exact data needed for the JavaScript method (assuming tokens do not contain excess properties).

Update: For additional information on Jquery Ajax, refer to: https://api.jquery.com/jQuery.ajax/

If you are aiming to transfer an object to JavaScript synchronously, consider updating your MVC ViewModel with a token field and passing it to the view script.

public ActionResult YourExistingAction()
{
    YourExistingViewModel model = new YourExistingViewModel();
    model.Tokens = db.tokens.ToList();
    return View(model);
}

Then in your view:

@model YourExistingViewModel

<script>
    var tokens = @Html.Raw(Json.Encode(Model.Tokens));
    $(function() {
        $("#demo-theme").tokenInput(tokens, { theme: "ab" });
    });
</script>

Answer №2

function retrieveTokens()
{
    var tokens = from T in db.tokens select T;
    var items = tokens.Select(t =>
        new SelectListItem { Value = t.id.ToString(), Text = t.tname });

    return Json(items, JsonRequestBehavior.AllowGet);
}

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