Gadgets, when enabled by a user, load on all pages in all namespaces. This doesn't cause any immediate functional problems, but is inefficient. In some cases, very unacceptably inefficient, to the point that a gadget may be removed from a wiki or disabled due to performance problems. This is usually worked around in one of two ways:
1. The gadget is split into two parts. A part that contains the actual gadget itself (hidden, disabled by default). And a (tiny) **second** part that is loaded always and checks whether the current page is the "right" one, and then loads the other.
* Downside: Two definitions instead of one.
* Downside: The page will first load without the gadget, and then later the gadget gets loaded (typically between 1-10s seconds later, depending on the connection and bandwidth).
1. The gadget is made hidden and is instead loaded by url parameter (e.g. `/wiki/Example?withModule=ext.gadget.foo`).
* Downside: Cannot be enabled on a per-user base (url parameter applies to all users). It also means the gadget only loads when the user follows a specific link, e.g. not when visiting the page through other means.
* Downside: The page will first load without the gadget, and then later the gadget
We should instead add an option directly in the Gadgets extension to specify when a gadget should load (by default still everywhere).
Eg. based on the namespace, or page title, or page action, or canonical special page name.
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Original request:
>
> **Author:** `gryllida`
>
> **Description:**
> We should add an option to specify what pages a gadget is active on. Many probably just do this manually, but it looks reasonable as some gadgets would only be useful for contributors' talk pages for example. This could be a namespace name, or sometimes even a glob mask (Wikipedia talk:Articles for Creation/*).
>
> **See Also**:
> {T17075}
**See Also**:
* {T31028}
* {T204201}
* {T8883}}