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Ajax in ASP.NET MVC

 Ajax in ASP.NET MVC:-

Ajax means asynchronous javascript and XML, It is used to partially update the content of web pages excluding complete web forms.

A means Asynchronous means we can implement multiple processes simletenious.

Javascript is used to handle the event, all code of Ajax for request and response will be defined under Javascript block.

XML is used to transfer the data from the client machine to the server machine and the server machine to the client machine.


XML means Extensible markup language that can be used on the browser side as well as server-side.



Code of Controller:-


using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using DataFirst.Models;

namespace DataFirst.Controllers

{

    public class SearchController : Controller

    {

        //

        // GET: /Search/

        private Database1Entities db = new Database1Entities();

        public ActionResult Index()

        {

            return View();

        }

        public ActionResult SearchResult(string id)

        {

           // ViewBag.data = id;

          //  var s = from c in db.Registrations where c.userid.Contains(id) select c;

            var s = from c in db.Registrations where c.userid.StartsWith(id) select c;

            return View(s.ToList());

        }

    }

}



Code of View File     

Index.cshtml

@{

    ViewBag.Title = "Index";

}

<script>

    function searchdata(a) {

        var xmlhttp = new XMLHttpRequest();

        xmlhttp.onreadystatechange = function () {

            document.getElementById("res").innerHTML = xmlhttp.responseText;

        }


        xmlhttp.open("POST", "Search/SearchResult/" + a, true);

        xmlhttp.send();

       

    }



</script>

<h2>Index</h2>

<input type="text" placeholder="Enter Content to search" onkeyup="searchdata(this.value)" />


<div id="res">


</div>


    

SearchResult.cshtml


@model IEnumerable<DataFirst.Models.Registration>


<div>


 <ul>

     @foreach (var item in Model)

     {

         <li>@Html.DisplayFor(a=>item.userid) </li>

     }



 </ul>

</div>


AJAX Example with Jquery:-

Jquery proviode $.ajax() that is easy to implement Ajax operation.

Step to implement this:-

1)  Add Controller and create two methods first for load view and second for ActionMethod

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using DataFirst.Models;

namespace DataFirst.Controllers

{

    public class AjaxdemoController : Controller

    {

        //

        // GET: /Ajaxdemo/

        Database1Entities db = new Database1Entities();

        public ActionResult Index()

        {

            return View();

        }

        [HttpPost]

        public ActionResult Ajaxcode(Stu st)

        {

            


            try

            {

               /* Stu s = new Stu();

                s.ID=st.ID;

                s.NAME=st.Name;

                s.AGE = st.Age.ToString();*/

                db.Stus.Add(st);

                db.SaveChanges();

                return Json(new

                {

                    msg = "Successfully added " + st.NAME

                });

            }

            catch (Exception ex)

            {

                throw ex;

            }  

        }

    }

}



2)  Create View file with following code:-

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script src="http://ajax.microsoft.com/ajax/jquery/jquery-1.10.2.js" type="text/javascript"></script>
    <script>

        $(document).ready(
            function () {
                $("#btn").click(function () { 
                    event.preventDefault();  
                    var Student = {  
                        ID: $("#txtid").val(),  
                        Name:$("#txtname").val(),  
                        Age:$("#txtage").val()  
                    };  
                    $.ajax({  
                        type: "POST",  
                        url: "/Ajaxdemo/Ajaxcode",  
                        data: JSON.stringify(Student),  
                        dataType: "json", 
                        contentType: 'application/json; charset=utf-8',  
                        success: function(data) {  
                        alert(data.msg);  
                    },  
                    error: function() {  
                        alert("Error occured!!")  
                    }  
                    });
                });
                
            });


    </script>

    
</head>
<body>
    <div>
        <input type="text" id="txtid" placeholder="Enter ID" />
        <br />
        <input type="text" id="txtname" placeholder="Enter name" />
        <br />
        <input type="text" id="txtage" placeholder="Enter age" />
        <br />
        <input type="button" id="btn" value="Ajax Call" />
    </div>
</body>
</html>


3)  Create Database and table, the table name will be Stu(ID, NAME, AGE), and migrate this table under Entity Framework.
Click on Button Application will be executed.




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