Handling json arrays returned from asp net web services with jquery
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In this video we will discuss how to handle JSON arrays returned from asp.net web service using jQuery.
When we click Get All Employees button, we want to retrieve all the Employees from the database table and display on the page using jQuery.
This is continuation to Part 62, please watch Part 62 before proceeding.
Step 1 : Copy and paste the following code in EmployeeService.asmx.cs
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.SqlClient;
using System.Web.Script.Serialization;
using System.Web.Script.Services;
using System.Web.Services;
namespace Demo
{
[WebService(Namespace = ”
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
[System.Web.Script.Services.ScriptService]
public class EmployeeService : System.Web.Services.WebService
{
[WebMethod]
public void GetAllEmployees()
{
List<Employee> listEmployees = new List<Employee>();
string cs = ConfigurationManager.ConnectionStrings[“DBCS”].ConnectionString;
using (SqlConnection con = new SqlConnection(cs))
{
SqlCommand cmd = new SqlCommand(“Select * from tblEmployee”, con);
con.Open();
SqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
Employee employee = new Employee();
employee.ID = Convert.ToInt32(rdr[“Id”]);
employee.Name = rdr[“Name”].ToString();
employee.Gender = rdr[“Gender”].ToString();
employee.Salary = Convert.ToInt32(rdr[“Salary”]);
listEmployees.Add(employee);
}
}
JavaScriptSerializer js = new JavaScriptSerializer();
Context.Response.Write(js.Serialize(listEmployees));
}
}
}
Step 2 : Copy and paste the following HTML and jQuery code in HtmlPage1.html
Replace < with LESSTHAN symbol and > with GREATERTHAN symbol
<html>
<head>
<script src=”jquery-1.11.2.js”></script>
<script type=”text/javascript”>
$(document).ready(function () {
$(‘#btnGetAllEmployees’).click(function () {
$.ajax({
url: ‘EmployeeService.asmx/GetAllEmployees’,
dataType: “json”,
method: ‘post’,
success: function (data) {
var employeeTable = $(‘#tblEmployee tbody’);
employeeTable.empty();
$(data).each(function (index, emp) {
employeeTable.append(‘<tr><td>’ + emp.ID + ‘</td><td>’
+ emp.Name + ‘</td><td>’ + emp.Gender
+ ‘</td><td>’ + emp.Salary + ‘</td></tr>’);
});
},
error: function (err) {
alert(err);
}
});
});
});
</script>
</head>
<body style=”font-family:Arial”>
<input type=”button” id=”btnGetAllEmployees” value=”Get All Employees” />
<br /><br />
<table id=”tblEmployee” border=”1″ style=”border-collapse:collapse”>
<thead>
<tr>
<th>ID</th>
<th>Name</th>
<th>Gender</th>
<th>Salary</th>
</tr>
</thead>
<tbody></tbody>
</table>
</body>
</html>
