How to Send Collection of JS objects to ASP.NET API service?

Question

I am trying to send collection of JavaScript objects to my API service, But server receive empty object list!

<script>

    //Collection
    var Collection = function () {
        this.count = 0;
        this.collection = {};

        this.add = function (key, item) {
            if (this.collection[key] != undefined)
                return undefined;
            this.collection[key] = item;
            return ++this.count
        }
        this.remove = function (key) {
            if (this.collection[key] == undefined)
                return undefined;
            delete this.collection[key]
            return --this.count
        }
        this.item = function (key) {
            return this.collection[key];
        }
        this.forEach = function (block) {
            for (key in this.collection) {
                if (this.collection.hasOwnProperty(key)) {
                    block(this.collection[key]);
                }
            }
        }
    }

// the JavaScript class for food 
  function foodcls(no,qunt,name, cals, carb, fat, prt,unt) {
        this.no = no;
        this.qunt = qunt;
        this.name = name;
        this.cals = cals;
        this.carb = carb;
        this.fat = fat;
        this.prt = prt;
        this.unt = unt;
    }
// instantiate new obj
var fod = new foodcls(3, 5, 'SomeName', 300, 180, 100, 20, 'Gram');
var fno =333;


var timCol = new Collection();
 timCol.add(fno, fod); 

  var urlpaths = '/api/FoodServ';
 $.ajax({
        url: urlpaths, 
        method: "POST",
        contentType: 'application/json;  charset=utf-8',
        data: JSON.stringify(timCol),
        success: function (data) {
// any thing
}
});

</script>

Code in ASP.NET API :

      [HttpPost]
    public HttpResponseMessage Post(List<foodcls> fods) // Here fods is empty
    {
        int rslt=0;
        string UserId = "[email protected]";//User.Identity.Name;
        List<Foods_Meal_TBL> fooditems = new List<Foods_Meal_TBL>();
          if (fods.Count()>0)
          {
              foreach (foodcls item in fods)
        {
            Foods_Meal_TBL fooditem = new Foods_Meal_TBL();
            fooditem.FoodNo = item.no;
            fooditem.Quantity = item.qunt;
            fooditem.PersonID = UserId;
fooditems.Add(fooditem);
        }
         }
        rslt = SaveAllItems(fooditems); // rslt Meal No
        return Request.CreateResponse(HttpStatusCode.OK, rslt);
    }

Any help please ?

Just send the items in array. Try to do that. and see how it hits it. — Casey ScriptFu Pharr
– Casey ScriptFu Pharr, Commented Sep 30, 2015 at 13:23
Have you taken a look at the XHR object from the AJAX call, change your sucess object to : success:function(data, status, xhr){/*break here or use alert */ alert(xhr.responseText);}..... — nckbrz
– nckbrz, Commented Sep 30, 2015 at 13:27
@Casey it worked with array but I need it in Collection, so I can reach it by key — Bashar Abu Shamaa
– Bashar Abu Shamaa, Commented Sep 30, 2015 at 13:33
@nixxbb Thanks, But I made a breakpoint on asp.net api post function to check the data first, The AJAX call reach the asp.net function but not send the data! — Bashar Abu Shamaa
– Bashar Abu Shamaa, Commented Sep 30, 2015 at 13:36
Not sure about Collections and JSON formatting, I always create objects var obj = {key:val} and add them to an array. Then I recall having some troubles parsing the JSON into a List, but it's been a while and I guess I'm not as familiar with what you are doing as I thought, sorry... — nckbrz
– nckbrz, Commented Sep 30, 2015 at 13:44

Bashar Abu Shamaa · Accepted Answer · 2015-10-20 07:26:24Z

I found away to solve the issue by convert the collection to array, I know it is not the best solution, And I hope someone could find better solution that avoid use array, but until someone give a better answer, I put my way to fix that as below: I have added the function toArr // means covert collection to array as below:

//Collection
var Collection = function () {
this.count = 0;
this.collection = {};

this.add = function (key, item) {
    if (this.collection[key] != undefined)
        return undefined;
    this.collection[key] = item;
    return ++this.count
}
this.remove = function (key) {
    if (this.collection[key] == undefined)
        return undefined;
    delete this.collection[key]
    return --this.count
}
this.item = function (key) {
    return this.collection[key];
}
this.forEach = function (block) {
    for (key in this.collection) {
        if (this.collection.hasOwnProperty(key)) {
            block(this.collection[key]);
        }
    }
}
this.toArr = function (block) {   //ToArray
    var fodarr = [];
    for (key in this.collection) {
        if (this.collection.hasOwnProperty(key)) {
            fodarr.push(this.collection[key]);// block(this.collection[key]);
        }
    }
    return fodarr;
}

}

ASP.NET API function :

  [HttpPost]
        public HttpResponseMessage Post(foodcls[] fods)

Hope that help someone in future...

Community · Accepted Answer · 2017-05-23 11:52:08Z

You can add method inside your Collection for converting you local collection to JSON object.

var Collection = function () {
        this.count = 0;
        this.collection = {};

        this.add = function (key, item) {
            if (this.collection[key] != undefined)
                return undefined;
            this.collection[key] = item;
            return ++this.count
        }
        this.remove = function (key) {
            if (this.collection[key] == undefined)
                return undefined;
            delete this.collection[key]
            return --this.count
        }
        this.item = function (key) {
            return this.collection[key];
        }
        this.toJSON = function(){
            return JSON.stringify(this.collection);
        }
        this.forEach = function (block) {
            for (key in this.collection) {
                if (this.collection.hasOwnProperty(key)) {
                    block(this.collection[key]);
                }
            }
        }
    }

Hope, it will help. Also suggestion: do not use objects for storing values, because they are slower then arrays.

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