Save Records Using jQuery, Web Services, and JSON Objects

Kundan Jha
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Introduction

Before going in detail of this article I would like to introduce you the technologies used in the example.

Jquery: JQuery is a JavaScript Library, it greatly simplifies JavaScript programming.

Web Services: A web service is the communication platform between two different platform applications that allows using their web method.

JSON:

JSON stands for JavaScript Object Notation
JSON is a lightweight data-interchange format
JSON is language independent *
JSON is "self-describing" and easy to understand

Note: For better understanding of jQuery you must have the knowledge of CSS and JavaScripts.

Descriptions

Here are the files we have to create:

Files

Step 1: Create an HTML Page Design Page:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="jquery-1.11.3.js"></script>
<script src="MyJsCode.js"></script>
<style type="text/css">
.auto-style1 {
width: 72px;
}
.auto-style2 {
width: 53px;
}
</style>
</head>
<body style="background-color:ActiveBorder">
<form id="form1" style="height: 500px; width: 500px;background-image:url('img/p2.jpg'); border:solid;
border-collapse:collapse;margin-top:120px; margin-left:400px;">
<div id="div1" style="height: 170px; width: 500px;">
<p style="margin-left:100px; font-family:Algerian;">Enter Name and Salary Below !</p>
<table id="tbl1" border="1" style="margin-left: 130px; margin-top: 30px">
<tr>
<td>Name</td>
<td>
<input id="txtname" type="text" /></td>
</tr>
<tr>
<td>Salary</td>
<td>
<input id="txtsalary" type="text" /></td>
</tr>
<tr>
<td colspan="2">
<input id="btnSave" type="button" value="Save" style="margin-left: 10px; width: 150px" />
</td>
</tr>
</table>
<br />
</div>
<div id="div2" style="height: 250px; width: 500px">
<p style="margin-left:150px; font-family:Algerian;">Employee Records</p>
<table id="tbl2" border="1" style="border-collapse: collapse; margin-left: 135px; width: 200px;">
<thead>
<tr>
<th class="auto-style2">ID</th>
<th>Name</th>
<th class="auto-style1">Salary</th>
</tr>
</thead>
<tbody>
</tbody>
</table>
</div>
</form>
</body>
</html>

Step 2: After designing the Web Page, let's create a table in SQL Server to save data.

result

Step 3: Create a user defined type (or class) to accept the user value:

public class Employee
{
public int ID { get; set; }
public string Name { get; set; }
public int Salary { get; set; }
}

Step 4: We have created a web service having two Web Methods with ADO.NET class to communicate with SQL Server from HTML Page.

public class My : System.Web.Services.WebService
{
string CS = ConfigurationManager.ConnectionStrings["MyCon"].ConnectionString;
//Below method will accept employee type object and save it DB.
[WebMethod]
public void saveData(Employee emp1)
{
SqlConnection _con = new SqlConnection(CS);
SqlCommand _cmd = new SqlCommand("insert into Employees values(@name,@salary)", _con);
_cmd.Parameters.AddWithValue("@name", emp1.Name);
_cmd.Parameters.AddWithValue("@salary", emp1.Salary);
_con.Open();
int i = _cmd.ExecuteNonQuery();
_con.Close();
}
//This method has used to select the employee record and store in collection.
[WebMethod]
public void GetEmployeeRecord()
{
List<Employee> _li = new List<Employee>();
SqlConnection _con = new SqlConnection(CS);
SqlCommand _cmd = new SqlCommand("select * from Employees", _con);
_con.Open();
SqlDataReader dr = _cmd.ExecuteReader();
while (dr.Read())
{
Employee emp = new Employee();
emp.ID = Convert.ToInt32(dr[0]);
emp.Name = dr[1].ToString();
emp.Salary = Convert.ToInt32(dr[2]);
_li.Add(emp);
}
_con.Close();
//JavaScriptSerializer class has used to convert list collection to JSON array.
JavaScriptSerializer js = new JavaScriptSerializer();
Context.Response.Write(js.Serialize(_li));
}
}

Web Services will look like.

Step 5: Finally, create a javascript file for jQuery functions.

Here we have created two functions like webservices:

//TO Save the User Data
$(document).ready(function () {
$("#btnSave").click(function () {
var employee = {};
employee.Name = $("#txtname").val();
employee.Salary = $("#txtsalary").val();
$.ajax({
url: 'My.asmx/saveData',
method: 'post',
contentType: 'application/json;Charset=utf-8',
data: '{emp1:' + JSON.stringify(employee) + '}',
success: function () {
show();
$("#txtname").val("");
$("#txtsalary").val("");
},
error: function (err) {
alert("Please Enter Name and Salary");
}
});
});
});
//TO Display the Records
function show() {
$.ajax({
url: 'My.asmx/GetEmployeeRecord',
dataType: "json",
method: 'post',
success: function (data) {
var employee = $("#tbl2 tbody");
employee.empty();
$(data).each(function (index, emp) {
employee.append('<tr><td>' + emp.ID + '</td><td>' + emp.Name + '</td><td>' + emp.Salary + '</td></tr>');
});
},
error: function (err) {
alert(err);
}
});
}

To successfully execution of jQuery codes, please download the latest jQuery script file form jquery.com.

Output:

Output

Hope you liked this article.

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