Calling a javascript function from Page_Load in code-behind

Question

How can I call a javascript function, that is in the aspx page, from the Page_Load method, in the code-behind?

Answer 1

You need to use Register client Script:

• MSDN

• CodeProject

I do it in a Page Load method:

if (!this.ClientScript.IsClientScriptBlockRegistered(this.GetType(), "HelpScript"))
{
  var scriptSource = "function ShowHelp() { alert(""); };\n";
  ScriptManager.RegisterClientScriptBlock(Page, this.GetType(), "HelpScript", scriptSource, true);
}

but I don't think it's recommended

I mean... you can do this, and it'll work. But for me the only good reason of inserting a script from asp.net page is to get some client side features of server controls.

So for example to get an instance of control:

var myControlId = this.control.ClientID;

But writing entire javascript functions and logic on the server side is not comfortable when you need to change it or debug it (for me it's hardcoded string).