Implement Key Value Pair with jQuery Autocomplete Plugin in ASP.Net
Hi all,
try this example to Implement Key Value Pair with jQuery Autocomplete Plugin in ASP.Net
In this example i will use Customer Table in Northwind Database
1) Open VS2008 and create a new web site
2) Add new Web.Config file and inside it i will add the connection string to Northwind database
<connectionStrings> <add name="constr" connectionString="Data Source = .;Initial Catalog = Northwind; Integrated Security = true"/> </connectionStrings>
3) Add Web Service and name it “Service.asmx” and in Service.cs add this code :-
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Services;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.Script.Services;
/// <summary>
/// Summary description for Service_CS
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[System.Web.Script.Services.ScriptService]
public class Service : System.Web.Services.WebService {
public Service () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string[] GetCustomers(string prefix)
{
List<string> customers = new List<string>();
using (SqlConnection conn = new SqlConnection())
{
conn.ConnectionString = ConfigurationManager
.ConnectionStrings["constr"].ConnectionString;
using (SqlCommand cmd = new SqlCommand())
{
cmd.CommandText = "select ContactName, CustomerId from Customers where " +
"ContactName like @SearchText + '%'";
cmd.Parameters.AddWithValue("@SearchText", prefix);
cmd.Connection = conn;
conn.Open();
using (SqlDataReader sdr = cmd.ExecuteReader())
{
while (sdr.Read())
{
customers.Add(string.Format("{0}-{1}", sdr["ContactName"], sdr["CustomerId"]));
}
}
conn.Close();
}
return customers.ToArray();
}
}
}
4) Add new Web page and name it “Default.aspx”
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"
type = "text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"
type = "text/javascript"></script>
<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css"
rel = "Stylesheet" type="text/css" />
<script type="text/javascript">
$(document).ready(function () {
$("#<%=txtSearch.ClientID %>").autocomplete({
source: function (request, response) {
$.ajax({
url: '<%=ResolveUrl("~/Service.asmx/GetCustomers") %>',
data: "{ 'prefix': '" + request.term + "'}",
dataType: "json",
type: "POST",
contentType: "application/json; charset=utf-8",
success: function (data) {
response($.map(data.d, function (item) {
return {
label: item.split('-')[0],
val: item.split('-')[1]
}
}))
},
error: function (response) {
alert(response.responseText);
},
failure: function (response) {
alert(response.responseText);
}
});
},
select: function (e, i) {
$("#<%=hfCustomerId.ClientID %>").val(i.item.val);
},
minLength: 1
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="txtSearch" runat="server"></asp:TextBox>
<asp:HiddenField ID="hfCustomerId" runat="server" />
<br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick = "Submit" />
</form>
</body>
</html>
and in code behind add this code :-
protected void Submit(object sender, EventArgs e)
{
string customerName = Request.Form[txtSearch.UniqueID];
string customerId = Request.Form[hfCustomerId.UniqueID];
Response.Write("Customer Name :- " + customerName + " and ID :- " + customerId);
}
Hope this helps
Good Luck
Yasser Zaid's Weblog 
Perfect! Just what I was looking for.
Thanks.
@Toby :- You are welcome hope my post helps you
Works like a charm, thanks man! 🙂
@Varun Rathore : you are welcome 🙂