[jQuery] autocomplete, extraParams and $(this)

[patrickk]

I´m a bit confused, because the following doesn´t seem to work and I
have no idea why ... after searching google for a couple of hours and
trying different solutions, I´m posting this here and hope that
someone can help.

    $("input.vAutocompleteField").autocomplete('/
autocomplete_lookup/', {
        highlight: false,
        mustMatch: false,
        matchContains: true,
        cacheLength: 20,
        minChars: 2,
        extraParams: {
            'extra_var': function() {
                return $(this).attr('id');
            }
        }
    });

"extra_var" should be the ID of the current input-field.

this is probably just me don´t seeing what´s wrong ... so any help is
appreciated.

thanks,
patrick