ASP.NET Calling defined JS-function with RegisterStartupScript

Question

In ASP.NET we are calling defined js-functions with the:

Page.ClientScript.RegisterStartupScript(GetType(), "", "JSFuncNameHere();", true);

I wonder:

• Why there isn't any method, which has a name like: Page.ClientScript.CallJSScript("someJSFunc");
• Why does the upper-method require the reflection method GetType() ? Something isn't defined at runtime, is it?
• Why do I need the 2nd argument key ? As I have tested, I can left it empty and the existed JS-function shall be called.

Answer 1

• Why there isn't any method, which has a name like: Page.ClientScript.CallJSScript("someJSFunc");

Probably because this is more generic solution, since by just adding 2 characters you get the same result and if you need you can add arguments and anything else.

• Why does the upper-method require the reflection method GetType() ? Something isn't defined at runtime, is it?
• Why do I need the 2nd argument key? As I have tested, I can left it empty and the existed JS-function shall be called.

For both of these the same reason - the method will detect if you run the same script multiple times and in such case, call it just once. The two arguments are the means how it identifies duplicates - a key is not sufficient since another class in a different library might be using the same key - so you need to pass in the type of your own class to ensure that the script is executed when you want it to.