Ajax in ASP.NET Core MVC

On the Visual Studio, create new ASP.NET Core MVC Web Application project

Select Empty Template

Click Ok button to Finish

Open Startup.cs file and add new configurations as below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;

namespace LearnASPNETCoreMVCWithRealApps
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseStaticFiles();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Demo}/{action=Index}/{id?}");
            });

        }
    }
}

Create new folder named Models. In Models folder, create new entity class as below:

Create new class named Product.cs as below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace LearnASPNETCoreMVCWithRealApps.Models
{
    public class Product
    {
        public string Id { get; set; }
        public string Name { get; set; }
        public string Photo { get; set; }
    }
}

Create new folder named Controllers. In this folder, create new controller named DemoController.cs as below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using LearnASPNETCoreMVCWithRealApps.Models;
using Microsoft.AspNetCore.Mvc;

namespace LearnASPNETCoreMVCWithRealApps.Controllers
{
    [Route("demo")]
    public class DemoController : Controller
    {
        [Route("")]
        [Route("index")]
        [Route("~/")]
        public IActionResult Index()
        {
            return View();
        }

        [Route("demo1")]
        public ContentResult Demo1()
        {
            return Content("Hello", "text/plain");
        }

        [Route("demo2/{fullName}")]
        public ContentResult Demo2(string fullName)
        {
            return Content("Hello " + fullName, "text/plain");
        }

        [Route("demo3")]
        public IActionResult Demo3()
        {
            var product = new Product()
            {
                Id = "p01",
                Name = "name 1",
                Price = 123
            };
            return new JsonResult(product);
        }

        [Route("demo4")]
        public IActionResult Demo4()
        {
            var products = new List<Product>()
            {
                new Product() {
                    Id = "p01",
                    Name = "name 1",
                    Price = 123
                },
                new Product() {
                    Id = "p02",
                    Name = "name 2",
                    Price = 456
                },
                new Product() {
                    Id = "p03",
                    Name = "name 3",
                    Price = 789
                }
            };
            return new JsonResult(products);
        }

    }
}

Create new folder named Views. In this folder, create new folder named Demo. Create new razor view named Index.cshtml, this file use JQuery Ajax as below:

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {

            $('#buttonDemo1').click(function () {
                $.ajax({
                    type: 'GET',
                    url: '/demo/demo1',
                    success: function (result) {
                        $('#result1').html(result);
                    }
                });
            });

            $('#buttonDemo2').click(function () {
                var fullName = $('#fullName').val();
                $.ajax({
                    type: 'GET',
                    url: '/demo/demo2/' + fullName,
                    success: function (result) {
                        $('#result2').html(result);
                    }
                });
            });

            $('#buttonDemo3').click(function () {
                $.ajax({
                    type: 'GET',
                    url: '/demo/demo3',
                    success: function (result) {
                        var s = 'Id: ' + result.id;
                        s += '<br>Name: ' + result.name;
                        s += '<br>Price: ' + result.price;
                        $('#result3').html(s);
                    }
                });
            });

            $('#buttonDemo4').click(function () {
                $.ajax({
                    type: 'GET',
                    url: '/demo/demo4',
                    success: function (result) {
                        var s = '';
                        for (var i = 0; i < result.length; i++) {
                            s += '<br>Id: ' + result[i].id;
                            s += '<br>Name: ' + result[i].name;
                            s += '<br>Price: ' + result[i].price;
                            s += '<br>------------------';
                        }
                        $('#result4').html(s);
                    }
                });
            });

        });
    </script>
</head>
<body>

    <fieldset>
        <legend>Demo 1</legend>
        <input type="button" value="Demo 1" id="buttonDemo1" />
        <br />
        <span id="result1"></span>
    </fieldset>

    <fieldset>
        <legend>Demo 2</legend>
        Full Name <input type="text" id="fullName" />
        <input type="button" value="Demo 2" id="buttonDemo2" />
        <br />
        <span id="result2"></span>
    </fieldset>

    <fieldset>
        <legend>Demo 3</legend>
        <input type="button" value="Demo 3" id="buttonDemo3" />
        <br />
        <span id="result3"></span>
    </fieldset>

    <fieldset>
        <legend>Demo 4</legend>
        <input type="button" value="Demo 4" id="buttonDemo4" />
        <br />
        <span id="result4"></span>
    </fieldset>

</body>
</html>

Access Index action in Demo controller with following url: http://localhost:48982/Demo/Index

Output

I recommend you refer to the books below to learn more about the knowledge in this article:

Create ASP.NET Core MVC Project

Add Configurations

Entity Class

Product Entity

Create Controller

Create View

Structure of ASP.NET MVC Core Project

Run Application

References