Simplest way to update a client-side javascript array variable during a ASP.NET AJAX postback in an UpdatePanel?

Question

If I want to inject a globally scoped array variable into a page's client-side javascript during a full page postback, I can use:

this.Page.ClientScript.RegisterArrayDeclaration("WorkCalendar", "\"" + date.ToShortDateString() + "\"");

to declare and populate a client-side javascript array on the page. Nice and simple.

But I want to do the same from a async postback from an UpdatePanel.

The closest I can figure so far is to create a .js file that just contains the var declaration, update the file during the async postback, and then use a ScriptManagerProxy.Scripts.Add to add the .js file to the page's global scope.

Is there anything simpler? r iz doin it wrong?

Answer 1

You could also update a hidden label inside the update panel which allows you to write out any javascript you like. I would suggest though using web services or even page methods to fetch the data you need instead of using update panels.

Example: myLabel.Text = "...."; ... put your logic in this or you can add [WebMethod] to any public static page method and return data directly.

Answer 2

Use the static method System.Web.UI.ScriptManager.AddStartupScript()

The script will run on all full and partial postbacks.

Answer 3

Sam is correct. ScriptManager.RegisterStartupScript is the correct name of the function . It will run on all full and partial page updates.