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ASP.NET MVC 6 Hosting - HostForLIFE.eu :: How to Call A C# Function With jQuery AJAX In ASP.NET MVC?

clock March 14, 2017 11:24 by author Peter

jQuery AJAX method is a very powerful function for doing asynchronous operations from the Web pages. It helps to update parts of a Web page without reloading the whole page. This increases the Website's speed and reduces the load. It can be used with any Web technology like HTML, ASP.NET, ASP.NET MVC, PHP, Ruby or any other. With jQuery AJAX method, you can create high performance features in our Website. Let me show you how to use this method in  ASP.NET MVC page.

ASP.NET MVC Page
To understand the working of jQuery AJAX, I will create a login feature in ASP.NET MVC page. The page will have 2 input controls to enter the username and the password. There will also be a button to submit the two values for checking from the database.
When the username and password are correct, the secured information of the user is shown, else the “wrong username and password” is shown.
The main attraction here is that I will use jQuery AJAX method to check the username and the password. There will be no page reloading during checking.
To start learning jQuery AJAX method, I would suggest you check – jQuery AJAX. Also, look for the syntax and the key-value pairs that can be passed to this method.

The Controller Code
Start with creating a “Controller” in your ASP.NET MVC Application. Now, add a C# function “GetSecuredData” into the controller.
[HttpPost] 
public string GetSecuredData(string userName, string password) 

    string securedInfo = ""; 
    if ((userName == "admin") && (password == "admin")) 
        securedInfo = "Hello admin, your secured information is ......."; 
    else 
        securedInfo = "Wrong username or password, please retry."; 
    return securedInfo; 
}
 

The C# function given above will be called by jQuery AJAX method. As you can see, this function has 2 parameters, “username” and “password”. In these 2 parameters, it receives the username and the password values. It then checks them and shows the secured information, if they are the correct ones.

You can also change the code given above to include the database operation, where the username and the password are checked against the ones stored in the database.

The View code
Now, create a view for the Controller. This view will contain the two input controls for the username and password. There will be a button, which when clicked will call jQuery AJAX function.
<h3>Enter the Username and Password:</h3> 
(enter "admin" for both username and password) 
<input type="text" id="usernameInput" placeholder="Username" /> 
<input type="text" id="passwordInput" placeholder="Password" /> 
<button id="submit">Submit</button> 
<div id="dataDiv"></div> 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script> 
<script> 
    $(document).ready(function () { 
        $("#submit").click(function (e) { 
            if ($("#usernameInput").val() == "") 
                alert("Username cannot be empty"); 
            else if ($("#passwordInput").val() == "") 
                alert("Password cannot be empty"); 
            else { 
                $.ajax({ 
                    type: "POST", 
                    url: "/Home/GetSecuredData", 
                    contentType: "application/json; charset=utf-8", 
                    data: '{"userName":"' + $("#usernameInput").val() + '","password":"' + $("#passwordInput").val() + '"}', 
                    dataType: "html", 
                    success: function (result, status, xhr) { 
                        $("#dataDiv").html(result); 
                    }, 
                    error: function (xhr, status, error) { 
                        $("#dataDiv").html("Result: " + status + " " + error + " " + xhr.status + " " + xhr.statusText) 
                    } 
                }); 
            } 
            return false; 
        }); 
    }); 
</script> 


The button click event will call jQuery AJAX event. We pass the “controller name/function name” to the URL field. The jQuery AJAX event will call the C# function which gets the username and password values in its parameters.

Finally in the success function we will show the returned value from the C# function.



ASP.NET MVC 6 Hosting - HostForLIFE.eu :: Dynamic And Friendly URL Using ASP.NET MVC

clock March 1, 2017 08:29 by author Peter

This post will tell you about Dynamic And Friendly URL Using ASP.NET MVC. Dynamic URL is a great feature working with MVC. Friendly URLs are even better. The following approach, I think, is the best way to work with friendly URL. So, let's define some premises. The URLs must be stored in a Repository. This means, I want to change and create new URLs in my repository. One or more URLs can be pointed to the same Controller/Action. This means, I want to have alias for URLs;
If a URL does not exist in my Repository, try to resolve it using MVC Controller/Action default behavior. It means, the MVC default behavior will still work;
The URL cannot contain an ID at the end. It means that the last segment of those URLs can be a long ID number.

First of all, MVC does not have a built-in feature for dynamic and friendly URLs. You must write your own custom code.

For solution, we will need the following.

  • An MVC project;
  • A class to handle route requests;
  • A route repository;
  • Controllers and Views;

PS-  I will not use a database to store those URLs but I will use the repository pattern and dependency resolver to configure it. So, you can create a database repository in future.

Class that identifies a URL -

Handlers/UrlHandler.cs
public sealed class UrlHandler { 
public static UrlRouteData GetRoute(string url) { 
    url = url ? ? "/"; 
    url = url == "/" ? "" : url; 
    url = url.ToLower(); 

    UrlRouteData urlRoute = null; 

    using(var repository = DependencyResolver.Current.GetService < IRouteRepository > ()) { 
        var routes = repository.Find(url); 
        var route = routes.FirstOrDefault(); 
        if (route != null) { 
            route.Id = GetIdFromUrl(url); 
            urlRoute = route; 
            urlRoute.Success = true; 
        } else { 
            route = GetControllerActionFromUrl(url); 
            urlRoute = route; 
            urlRoute.Success = false; 
        } 
    } 

    return urlRoute; 


private static RouteData GetControllerActionFromUrl(string url) { 
    var route = new RouteData(); 

    if (!string.IsNullOrEmpty(url)) { 
        var segmments = url.Split('/'); 
        if (segmments.Length >= 1) { 
            route.Id = GetIdFromUrl(url); 
            route.Controller = segmments[0]; 
            route.Action = route.Id == 0 ? (segmments.Length >= 2 ? segmments[1] : route.Action) : route.Action; 
        } 
    } 

    return route; 


private static long GetIdFromUrl(string url) { 
    if (!string.IsNullOrEmpty(url)) { 
        var segmments = url.Split('/'); 
        if (segmments.Length >= 1) { 
            var lastSegment = segmments[segmments.Length - 1]; 
            long id = 0; 
            long.TryParse(lastSegment, out id); 

            return id; 
        } 
    } 

    return 0; 

}

Route Handler that handles all requests.

Handlers/UrlRouteHandler.cs
public IHttpHandler GetHttpHandler(RequestContext requestContext)  

var routeData = requestContext.RouteData.Values; 
var url = routeData["urlRouteHandler"] as string; 
var route = UrlHandler.GetRoute(url); 

routeData["url"] = route.Url; 
routeData["controller"] = route.Controller; 
routeData["action"] = route.Action; 
routeData["id"] = route.Id; 
routeData["urlRouteHandler"] = route; 

return new MvcHandler(requestContext); 
}

The route handler configuration.

App_Start/RouteConfig.cs

public class RouteConfig  

public static void RegisterRoutes(RouteCollection routes)  

    routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); 

    routes.MapRoute( 
        "IUrlRouteHandler", 
        "{*urlRouteHandler}").RouteHandler = new UrlRouteHandler(); 

}


Repository/IRouteRepository.cs
public interface IRouteRepository: IDisposable  

IEnumerable < RouteData > Find(string url); 
}

Repository/StaticRouteRepository.cs

public class StaticRouteRepository: IRouteRepository 

public void Dispose() { 



public IEnumerable < RouteData > Find(string url) { 
    var routes = new List < RouteData > (); 
    routes.Add(new RouteData() { 
        RoouteId = Guid.NewGuid(), 
            Url = "how-to-write-file-using-csharp", 
            Controller = "Articles", 
            Action = "Index" 
    }); 
    routes.Add(new RouteData() { 
        RoouteId = Guid.NewGuid(), 
            Url = "help/how-to-use-this-web-site", 
            Controller = "Help", 
            Action = "Index" 
    }); 

    if (!string.IsNullOrEmpty(url)) { 
        var route = routes.SingleOrDefault(r => r.Url == url); 
        if (route == null) { 
            route = routes.FirstOrDefault(r => url.Contains(r.Url)) ? ? routes.FirstOrDefault(r => r.Url.Contains(url)); 
        } 

        if (route != null) { 
            var newRoutes = new List < RouteData > (); 
            newRoutes.Add(route); 

            return newRoutes; 
        } 
    } 

    return new List < RouteData > (); 

}


I have created 2 URLs. One URL will point to the Help Controller while the other one to the Articles Controller. For dependency resolver configuration, I used Ninject.
App_Start/NinjectWebCommon.cs
private static void RegisterServices(IKernel kernel) 

kernel.Bind < Repository.IRouteRepository > ().To < Repository.StaticRouteRepository > (); 
}



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