Question

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JavaScript Function Definition in ASP User Control

Hi,

I have a generic user control which will be used twice in a page. There is a javascript asscoiated with it which also needs to be added. How can I add this to a page since the javascript will be added multiple times.

Answer 1

The ClientScriptManager is what you are looking for it has a set of RegisterClientScriptxxx methods for registering strings/include file/resources etc. as client script blocks. Each of these methods takes arguments of a key and optionally a type, the script with each key/type are only included once.

In the OnLoad or OnInit of your user control you want a call like the following

Page.ClientScriptManager.RegisterClientScriptInclude(typeof(MyUserControl), "myscript", @"/path/to/my/script.js");

No matter how many instances of the user control are in the page the script will only get included once.

BTW, Page.RegisterClientScriptxxx methods are now deprecated, ClientScriptManager is preferred.