method for add and update data from popup - asp.net

Question

I have a pop up form from which new data can be added or old data can be updated.
But I don't know how to write method for this condition. I mean in the case of new data entry I don't need the Id but in case of edit I need the Id attribute. The controller name is Vehicle.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult AddorEdit([Bind(Include = "Id,VehicleType,Amount,RenewPeriod,Status")] Vehicle vehicle)
{
vehicle.RegisteredDate = DateTime.Now;
vehicle.RegisteredBy = "admin";
if (ModelState.IsValid)
{
db.Vehicle.Add(vehicle);
db.SaveChanges();
}
return Json(new { success = true, message = "Saved Successfully" }, JsonRequestBehavior.AllowGet);
}
The jquery code of index page from where pop up is called ::
<a class="btn btn-success" style="margin-bottom:10px;" onclick="PopupForm('#Url.Action("AddorEdit", "Vehicles")')"><i class="fa fa-plus"></i> Add New</a>
<script>
var Popup, dataTable;
$(document).ready(function () {
dataTable = $("#tbl_vehicle").DataTable({
"ajax":{
"url": "/Vehicles/GetVehicle",
"type": "GET",
"datatype": "json"
},
"columns": [
{ "data": "VehicleType" },
{ "data": "Amount" },
{ "data": "RenewPeriod" },
{ "data": "RegisteredDate" },
{ "data": "RegisteredBy" },
{ "data": "Status" },
{ "data": "ModifiedBy" },
{ "data": "ModifiedDate" }
],
"language": {
"emptyTable" : "No data available, please click on <b>Add</b> button"
}
});
});
function PopupForm(url) {
var formDiv = $('<div/>');
$.get(url).done(function (response) {
formDiv.html(response);
Popup = formDiv.dialog({
autoOpen: true,
resizable: false,
title: 'fill details',
height: 500,
width: 700,
close: function () {
Popup.dialog('destroy').remove();
}
});
});
}
function SubmitForm(form) {
alert("testing....");
$.ajax({
type: "POST",
url: form.action,
data: $(form).serialize(),
success: function (date) {
if(data.success)
{
Popup.dialog('close');
dataTable.ajax.reload();
}
}
});
return false;
}
</script>

Answer 1

An easy way to handle this by making id as a HiddenField so when ever user post data to the server you can query the id field.
whether it has value or not and decide which operation you should perform i.e. Add operation if id is null/empty and Edit Operation if Id has the value.
Please use below code section for reference :
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult AddorEdit([Bind(Include = "Id,VehicleType,Amount,RenewPeriod,Status")] Vehicle vehicle)
{
if (ModelState.IsValid)
{
if(vehicle.Id <= 0)
{
vehicle.RegisteredDate = DateTime.Now;
vehicle.RegisteredBy = "admin";
db.Vehicle.Add(vehicle);
}
else
{
db.Entry(vehicle).State = EntityState.Modified;
//perform more checks if you want
}
db.SaveChanges();
}
return Json(new { success = true, message = "Saved Successfully" }, JsonRequestBehavior.AllowGet);
}

Answer 2

You can achieve it by this simple way
if (ModelState.IsValid)
{
if(vehicle.Id <= 0)
{
vehicle.RegisteredDate = DateTime.Now;
vehicle.RegisteredBy = "admin";
db.Vehicle.Add(vehicle);
}
else
db.Entry(vehicle).State = EntityState.Modified;
db.SaveChanges();
}