Dynamically Adding JavaScript in ASP.Net AJAX/Call Javascript function in Asp.net Ajax Call

To add a Javascript function programmatically from codebehind we use the new ClientScriptManager class in asp.net 2.0. The same methods in ClientScriptManager class will not inject scripts when we try to add it from an Asynchronous postback in ASP.Net AJAX.

The ScriptManager class is packed with all the client side script injection methods in ASP.Net AJAX.

To insert a start up script from a AJAX postback,

ScriptManager.RegisterStartupScript(btnSubmit, Page.GetType(), "alert", "alert('test')", true);

The boolean parameter in the last will dictate whether to add script tags.

To inject a confirm script from a AJAX postback,

ScriptManager.RegisterOnSubmitStatement(btnSubmit, Page.GetType(), "confirm", "return confirm('Are you sure');");

To register a Client Script block,

ScriptManager.RegisterClientScriptBlock(btnSubmit, Page.GetType(), "alert", "alert('test')", true);

The boolean parameter in the last will dictate whether to add script tags.