How to encrypt JavaScript code?

ASP.NET: How is the flow of control when JavaScript is called from code behind?

• Recently I called a JavaScript from code behind using page.registerstartupscript. Now as javascript is executed on client machine and code behind would run on server. Does server continue executing .cs code? or does it wait until javascript is finishes its execution? If it waits then how does it get knowledge of completion of executed script?

• Answer:

  MSDN, .Net Framework 4 ClientScriptManager.RegisterStartupScript Method (Type, String, String) http://msdn.microsoft.com/en-us/library/asz8zsxy.aspx A client script is uniquely  identified by its key and its type. Scripts with the same key and type  are considered duplicates. Only one script with a given type and key  pair can be registered with the page. Attempting to register a script  that is already registered does not create a duplicate of the script. Call the IsStartupScriptRegistered method to determine whether a startup script with a given key and type  pair is already registered and avoid unnecessarily attempting to add the  script. In this overload of the RegisterStartupScript method, you must make sure that the script provided in the script parameter is wrapped with a <script> element block. The script block added by the  RegisterStartupScript method executes when the page finishes loading but before the page's OnLoad event is raised. The script blocks are not guaranteed to be output in  the order they are registered. If the order of the script blocks is  important, use a StringBuilder object to gather the scripts together in a single string, and then register them all in a single client script block. In short: the method does not execute any Javascript, it simply adds a script block to the output of the control that renders right at the bottom and is run on the client-side. The code in the .cs file tells the compiler to add the defined Javascript to the output, nothing more.