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.

Knaģis · Accepted Answer · 2013-03-06 21:00:16Z

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.

answered Mar 6, 2013 at 21:00

Knaģis

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1 Comment

Snixtor Over a year ago

It's worth pointing out that the MSDN documentation for RegisterStartupScript - msdn.microsoft.com/en-AU/library/z9h4dk8y.aspx - provides the answers for points 2 and 3 in "Remarks". When trying to determine the purpose of method parameters, MSDN should always be your first stop :)

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