Registers a startup script block for a control that is inside an UpdatePanel by using the ScriptManager control, and adds the script block to the page.
- control (Control)
The control that is registering the client script block.
- type (Type)
The type of the client script block. This parameter is usually specified by using the typeof (C# Reference) operator (C#) or the GetType Operator operator (Visual Basic) to retrieve the type of the control that is registering the script.
- key (String)
The string that uniquely identifies the script block.
- script (String)
The script literal.
- addScriptTags (Boolean)
A Boolean value that indicates whether to enclose the script block with <script> tags.
The RegisterStartupScript method is used to register a startup script block for a page that is compatible with partial-page rendering and that has no Microsoft AJAX Library dependencies. Startup script blocks that are registered with this method are sent to the page only when the control that is registering the block is inside an UpdatePanel control that is updated. To register a startup script block each time an asynchronous postback occurs, use the RegisterStartupScript(Page, Type, String, String, Boolean) overload of this method. If you are registering a script file that does not pertain to partial-page updates and you want to register a client script file only one time during initial page rendering, use the RegisterStartupScript(Type, String, String) method of the ClientScriptManager class. You can get a reference to the ClientScriptManager object from the ClientScript property of the page.
The script block that is added by the RegisterStartupScript method executes when the page finishes loading but before the page's client onload event is raised. Startup script blocks are located at the bottom of the rendered ASP.NET page just before the </form> tag.
Startup script blocks that are registered with RegisterStartupScript are not guaranteed to be output in the same order in which they are registered. If the order of the startup script blocks is important, use a StringBuilder object to gather the script blocks in a single string, and then register them all as a single startup script.
Assembly: System.Web.Extensions (Module: System.Web.Extensions)