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Populate or bind Dropdownlist in Asp.net using Jquery and Json

Posted By: rakesh On:3/18/2013 11:16:29 AM in:Articles Category:JQwery Hits:5281
Here you will learn how to populate dropdownlist in Asp.net using Jquery and JSON 

Create a Website using Visual Studio 2010 then in Solution Explorer you will see Default.aspx, About.aspx pages are created.

Open your Default.aspx Page.Add jQuery Reference in your Default.aspx page either by google CDN or from local script directory. Drag and Drop Dropdownlist control from toolbar.

 Add following script into your Default.aspx page as shown below.


  <script src="Scripts/jquery-1.4.1.js"type="text/javascript"></script>
   <script language="javascript">
       $.ajax({
           type: "POST",
           url: "Default.aspx/fetchData",
           data: "{}",
           contentType: "application/json; charset=utf-8",
           dataType: "json",
           success: function (response) {
               var Dropdown = $('#<%=DropDownList1.ClientID %>');
               Dropdown.append(new Option("SELECT", 0));
               $.each(response.d, function (index, item) {
                   Dropdown.append(new Option(item.Fullname, item.ID));
               });
           },
           error: function () {
               alert("Failed to load data");
           }
       });

       $(document).ready(function () {
           var dropdown = $('#<%=DropDownList1.ClientID %>');
           dropdown.change(function () {
               $("#<%=msg.ClientID%>").text(dropdown.val());
           });
       });     
      
   </script>


Add Following code under the content of Default.aspx page
  <h2>Fill Dropdown list using jQuery,JSON object</h2>
   <p>
       <asp:DropDownList ID="DropDownList1"runat="server"/>
   </p>
   <asp:Label ID="msg"runat="server"></asp:Label>

Open your Default.aspx.cs/.vb, create a WebMethod which will fetch Employee list as shown below code.

Imports System.Web.Services
Partial Class_Default
   Inherits System.Web.UI.Page
   <WebMethod()> _
   Public Shared Function fetchData() As List(Of Employee)
    Return New List(OfEmployee)() With { _
        New Employee() With { _
            .Fullname = "Sarvesh Mathur", _
            .ID = 1 _
        }, _
        New Employee() With { _
            .Fullname = "Rakesh Sinha", _
            .ID = 2 _
        }, _
        New Employee() With { _
            .Fullname = "Rounak Sinha", _
            .ID = 3 _
        }, _
        New Employee() With { _
            .Fullname = "Soumya Verma", _
            .ID = 4 _
        }, _
        New Employee() With { _
            .Fullname = "Terence Thakar", _
            .ID = 5 _
        }, _
        New Employee() With { _
            .Fullname = "Sanyara singh", _
            .ID = 6 _
        } _
    }

   EndFunction
EndClass
Public Class Employee
   Public Property Fullname() AsString
       Get
           Return m_Fullname
       End Get
       Set(ByVal value AsString)
           m_Fullname = value
       End Set
   End Property
   Private m_Fullname AsString
   Public Property ID() AsInteger
       Get
           Return m_ID
       EndGet
       Set(ByVal value AsInteger)
           m_ID = value
       EndSet
   End Property
   Private m_ID AsInteger
EndClas


@ the end save and rin the project.


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Rakesh Sinha
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