Question:

1. How to call Server Side methods or functions using JavaScript in ASP.NET?
2. How to call Server Side methods Client Side in ASP.NET?

We will show you this tutorial using JQuery to solve this problem. JQuery allows you to call Server Side ASP.NET methods from client side without any PostBack.

Syntax

You can see this figure below:



HTML Markup

<div>
Your Name :
<asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
<input id="btnGetTime" type="button" value="Show Current Time"
    onclick = "ShowCurrentTime()" />
</div>

As you can see, I have added a textbox when user can enter his name and a TML button that calls a JavaScript method to get the Current Time.

Client Side Methods

<script src="scripts/jquery-1.3.2.min.js" type="text/javascript"></script>
<script type = "text/javascript">
function ShowCurrentTime() {
    $.ajax({
        type: "POST",
        url: "CS.aspx/GetCurrentTime",
        data: '{name: "' + $("#<%=txtUserName.ClientID%>")[0].value + '" }',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: OnSuccess,
        failure: function(response) {
            alert(response.d);
        }
    });
}
function OnSuccess(response) {
    alert(response.d);
}
</script>

Above the ShowCurrentTime method makes an AJAX call to the server and executes the GetCurrentTime method which accepts the username and returns a string value.

Server Side Methods

C#

[System.Web.Services.WebMethod]
public static string GetCurrentTime(string name)
{
    return "Hello " + name + Environment.NewLine + "The Current Time is: "
        + DateTime.Now.ToString();
}

VB.NET

<System.Web.Services.WebMethod()> _
Public Shared Function GetCurrentTime(ByVal name As String) As String
   Return "Hello " & name & Environment.NewLine & "The Current Time is: " & _
            DateTime.Now.ToString()
End Function

The above method simply returns a greeting message to the user along with the current server time. An important thing to note is that the method is declared as static (C#) and Shared(VB.Net) and also it is declared as Web Method unless you do this you won’t be able to call the methods.

Hope the above tutorial help you to answer the question above. Good luck!!

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