How to Call ASP.NET Functions from JavaScript via PostBack?

Calling ASP.NET Functions from JavaScript via PostBack

In ASP.NET, you may encounter scenarios where you want to trigger an ASP.NET method from JavaScript code. This article addresses this need by exploring how to perform this task without utilizing Ajax or other frameworks.

To achieve this, we can leverage the concept of a postback in conjunction with a special interface implementation. Follow these steps:

1. Implement the IPostBackEventHandler Interface:

   • In your .aspx.cs code file, add the IPostBackEventHandler interface to your page class, making it look like:

     public partial class Default : System.Web.UI.Page, IPostBackEventHandler

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2. Create the RaisePostBackEvent Method:

   • The interface implementation automatically adds the RaisePostBackEvent method to your code file:

     public void RaisePostBackEvent(string eventArgument) { }

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3. Call from JavaScript:

   • In your JavaScript click event, use the following code:

     var pageId = '<%= Page.ClientID %>';
     __doPostBack(pageId, argumentString);

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This approach, though slightly unconventional, enables you to initiate an ASP.NET postback from JavaScript, allowing you to invoke methods in your ASP.NET code.

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