Asynchronous lookup functionality for Typeahead widget...

Created by: jasonwyatt

This is a solution to issue #1336 (closed)

We've made it possible to specify either an array or a function as the value of source for the Typeahead widget. Additionally, it is now possible to have items which are objects.

An example which calls a fictional search service for typeahead results:

$('#mytypeahead').typeahead({
    source: function(query, maxResults, callback){
        // Do any sort of asynchronous action and when complete, call 
        //  `callback` with an array of items.
        $.get('http://myurl.com/search', { 
            q: query, 
            limit: maxResults 
        }, function(data){
            callback(data.items);
        });
    },
    valueField: 'id', // field in items to be used for the value of the item
    labelField: 'label' // field in items to be used for the displayable value of the item
});

Note:

Backward compatibility has been maintained.