Execute code after Asynchronous postbacks

When we use ASP.NET UpdatePanel in our application and do postbacks, it results asynchronous postbacks from controls inside UpdatePanel which don’t trigger window.load() or jQuery’s $(document).ready() methods. To run a method after asynchronous postback, we need to use Sys.WebForms.PageRequestManager. It has add_endRequest() method which allows to attach method to this event which will run after asynchronous postbacks.
To do this, add these lines in your javascript code.

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(loadText);

function loadText() {

// Add your code which will run after Asynchronous postback.

}

If you are doing something on window.load() or $(document).ready() event and want to execute it after postbacks from controls residing inside UpdatePanel, copy that in your asynchronous postback event handler(s) as well.

For attaching a method with Page Load event, we can use

Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(eventHandler);