Last modified: 2008-04-22 19:55:43 UTC
Right now all values for autocompletion are loaded within the page which makes it impossible to use it on large datasets (thousands of entries) which will be often the case with large categories, for example.
The idea is to send requests to server on the fly while user types the value - this way the resulting dataset will be much smaller. It can also be limited to some particular number of entries through configuration parameter.
It might be a good idea to extend MediaWiki API: http://www.mediawiki.org/wiki/API to provide actual results.
Autocompletion got implemented in version 1.1 of Semantic Forms.