How Can I Call Server-Side Methods from Client-Side JavaScript in ASPX Pages?

Calling Server-Side Methods from Client-Side JavaScript Functions

In the quest to seamlessly integrate frontend and backend code, it often becomes necessary to call server-side methods from client-side JavaScript functions. Let's explore how to achieve this communication in the context of an ASPX page.

Starting with the HTML markup, we have an HTML button with an onclick event handler linked to a JavaScript function called btnAccept_onclick(). This function captures the value entered in a text field named 'txtName'. Our objective is to pass this value to a server-side method named SetName().

In the code-behind file, the SetName() method can be defined as a public void method receiving a string parameter. However, the key to enabling communication between the client and server lies in creating a web method.

To create a web method, decorate the method with the [WebMethod] attribute. This allows it to be invoked from client-side code. For instance,

[WebMethod]
public static String SetName(string name)
{
    // Code for some functionality
    return "Your String"
}

Equipped with the web method, we can now make the call from JavaScript. PageMethods.SetName() provides the necessary interface to invoke web methods from the client-side.

PageMethods.SetName(name, onSuccessMethod, onFailMethod);

For proper communication, ensure you include a ScriptManager in your ASPX page. This enables ScriptManager to handle asynchronous postbacks and manage web method invocations.

<asp:ScriptManager ID="ScriptMgr" runat="server" EnablePageMethods="true"></asp:ScriptManager>

By following these steps, you can seamlessly initiate communication between client-side JavaScript functions and server-side methods, providing a seamless integration between the frontend and backend layers.

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