How to Call ASP.NET Functions from JavaScript Using Postbacks?

Calling ASP.NET Functions from JavaScript

Many developers encounter the need to call ASP.NET methods from JavaScript code, particularly when designing interactive web pages. To achieve this, there are various approaches, but one simple solution is bypassing AJAX and utilizing the standard ASP.NET postback mechanism.

ASP.NET Page Modification

To initiate the postback, modify the code file of the page as follows:

1. Implement the IPostBackEventHandler interface in the page class:

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

2. This will automatically add the RaisePostBackEvent method to the code file:

   public void RaisePostBackEvent(string eventArgument) { }

JavaScript Event Handling

Within the JavaScript click event handler, use the following code to trigger the postback:

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

Passing Arguments

The eventArgument parameter of the RaisePostBackEvent method can be used to pass values from JavaScript to the ASP.NET function.

Event Handling in ASP.NET

Within the RaisePostBackEvent method, you can now handle the postback event and call any other events or methods as needed.

By following these steps, you can easily call ASP.NET functions from JavaScript code without the need for external libraries or complex AJAX techniques.

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