如何将ViewBag从控制器传递到View（Ajax Url）

Question

** Controller Code **

I have the below code in my Controller and the method get_curent_LoanNumber

public JsonResult (string loan_code)
{
    try
    {
        using (sqlConnection)
        {
            dynamic loanno = sqlConnection.Query("get_loan_number", new {loan_code }, 
            commandType: CommandType.StoredProcedure).SingleOrDefault();

            ViewBag.currentLoanNumbe= loanno.LoanNo;

            return Json(loanno, JsonRequestBehavior.AllowGet);
        }
    }
    catch (Exception)
    {
        throw;
    }
}

View Code This is the code in the View , the JavaScript function savePayslipInfo makes the Ajax request.

 function () {

    console.log('@ViewBag.currentLoanNumbe');
    $.ajax({
        type: "POST",
        url: "http://localhost:1079/loanapplication/save_Payslip_Info/?loan_no" + '@ViewBag.currentLoanNumbe',
        data: {
            //loan_no: $(loan_no).val(),
            basic_salary: $("#basic_salary").val(),
            house_allowance: $("#house_allowance").val(),
            other_allowance: $("#other_allowance").val(),
            other_payment: $("#other_payment").val(),
            total_deduction: $("#total_deduction").val()
        },
        success: function () {
            $('#msg').html("Payslip info saved successfully").fadeIn('slow');
            $('#msg').delay(4000).fadeOut('slow');
        }
    });
}

Answer 1

This is not how MVC works. You are not returning a view from your action method. You are returning a JSON. So there is no view that gets rendered tied to the action method. What you are essentially doing is using the action method as an API and calling it from Javascript using AJAX which is not the same as returning and binding a view from action. Your ViewBag won't be accessible because the View you are using here is not being rendered by the Action method in the question.