How do I get values from a controller using javascript ajax function in mvc 4?

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here is my code

/********Controller**********/

C#

public JsonResult GetTransactionBuyingRate(int? eventIdB, decimal? NRB)
        {
            var currFrom = db.Currencys.Where(u => u.CurrencyId == eventIdB).First();
            Session["NewBTrate"] = currFrom.Buying_Rate;
            NRB = currFrom.Buying_Rate;
            var result = currFrom.Buying_Rate;
            return Json(result, JsonRequestBehavior.AllowGet);
        }

/**********Javascript Ajax Function**************/

C#

<script type="text/javascript">
        function GetTransactionBuyingRate()
                    {                  
            var eventIdB = document.getElementById("CurrencyId").value;
            var NRB;
            alert(eventIdB);
                        $.ajax(
                            {
                                url: '@Url.Action("GetTransactionBuyingRate", "Transaction")',
                                type: 'GET',
                                data: { eventIdB: eventIdB },
                                cache: false,
                                success: function (result) {
                                    var NCRB = '@Session["NewBTrate"]';   
                                    alert(NCRB);
                                    $('#Transaction_Rate').val(NCRB);
                                }
                            });
                        }
        </script>

Can someone help me return value to the decimal variable 'NRB' and assign it to '$('#Transaction_Rate').val()' after ajax function completes???

Posted 12-Apr-14 10:21am

Member 10471426

Updated 12-Apr-14 12:26pm

Nelek

v2

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Comments

Abinash_Sahoo 12-Apr-14 16:36pm

did you try without quote? : var NCRB = @Session["NewBTrate"];

Member 10471426 12-Apr-14 16:51pm

Yes I did and had syntax error..

Pheonyx 12-Apr-14 18:48pm

Have you tried alert(result) ?
The value of the result object, should the result you are returning from your action.

Member 10471426 12-Apr-14 20:35pm

Yes I have tried that too but the result is undefined...

Member 10471426 13-Apr-14 2:05am

Hi, its works now, thanks people......

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Yasser R Shaikh · Accepted Answer · 2014-04-12T19:43:00

I think you are doing it wrong. You have a controller action with decimal? NRB as a parameter which you are not passing value to from your ajax call but you setting that variable and then trying to some how use it.

I think you could have your controller as shown below:

public JsonResult GetTransactionBuyingRate(int? eventIdB, decimal? NRB)
{
    var currFrom = db.Currencys.Where(u = > u.CurrencyId == eventIdB).First();
    return Json(currFrom.Buying_Rate, JsonRequestBehavior.AllowGet);
}

<script type="text/javascript">
    function GetTransactionBuyingRate() {
        var eventIdB = document.getElementById("CurrencyId").value;    
        $.ajax({
            url: '@Url.Action("GetTransactionBuyingRate", "Transaction")',
            type: 'GET',
            data: {
                eventIdB: eventIdB
            },
            cache: false,
            success: function(result) {
                alert(result);
                $('#Transaction_Rate').val(result);
            }
        });
    }
</script>

Also would suggest you to open your Dev tools (f12) and check for errors if any and network calls.