Re: using custom datasources with autocomplete textbox

[Neil]

Tony wrote:

I've got thus far in my research:-

var contractid = "@mozilla.org/autocompleteSession;1?type=my_datasource";
var session = Components.classes[contractid].getService(components.
                      interfaces.nsIAutoCompleteSession);
But where and what would my_datasource be?  Please excuse me no knowing all about this, I am still trying to learn it.
 

This only applies to registered datasources. In this case you can use 
the searchSessions= attribute to specify a registered datasource. 
However you can also use the autocomplete's addSession method to add a 
manually created session.

The manually created session, like the registered datasources, must 
implement the nsIAutoCompleteSession.idl interface. Basically this means 
that the autocomplete will call the three functions declared. One way of 
doing this is like this:

var myDatasource = {
   onStartLookup: function onStartLookup(searchString, 
previousSearchResult, listener) {
      /* build up your results (you might be able to search the 
previousSearchResult rather than your original data source) then send 
your results to the listener */
   },
   onStopLookup: function onStopLookup() {
      /* stop sending the results to the listener. It only applies for 
asynchronous results */
   },
   onAutoComplete: function onAutoComplete(searchString, 
previousSearchResult, listener) {
      /* this probably doesn't have to do anything, or the same as 
onStartLookup */
   }
};

I've since discovered that you can (at least from chrome) create 
autocomplete results and item instances, which will simplify the rest of 
your code:
Components.classes['@mozilla.org/autocomplete/results;1'].createInstance(Components.interfaces.nsIAutoCompleteResults);
Components.classes['@mozilla.org/autocomplete/item;1'].createInstance(Components.interfaces.nsIAutoCompleteItem);

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