从控制器调用javascript函数

Question

I need to call a JavaScript function in a Controller function. My code looks like the following:

    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Edit(DeviceLocation locationToEdit)
    {
        var originalLocation = (from m in _db.DeviceLocations
                                where m.Id == locationToEdit.Id
                                select m).First();

        if (!ModelState.IsValid)
            return View(originalLocation);

        _db.ApplyCurrentValues(originalLocation.EntityKey.EntitySetName, locationToEdit);
        _db.SaveChanges();

        Utility.mostRecentLocationUpdate = locationToEdit;

        /******************************************
        need to call updateMap() JavaScript function
        *******************************************/

        return RedirectToAction("Locations");
    }

Thanks!

Answer 1

I need to update a map when a database changes. Ideally, the updateMap() should be a callback function that gets executed automatically when a row in the Location table changes

You need to poll the server with Ajax , use sockets (very limited support), or comet to ask the server for new data. The server can not just send down the data at will.

Answer 2

I would recommend looking into SignalR . It allows the sort of functionality you want, but it unfortunately doesn't have very good documentation, and Google is always trying to correct your searches to "signal" which is annoying when trying to find information on it.