Why are the typeahead suggestions undefined? - typeahead

Question

Hopefully this is not a duplicate of: Why does bloodhound.get() return undefined?
I upgraded to typeahead.js version 0.10.0. Prior versions were returning the suggestions properly. Now I am getting an undefined return with the below code:
// instantiate the bloodhound suggestion engine
var engine = new Bloodhound({
datumTokenizer: function (d) { return [d]; },
queryTokenizer: Bloodhound.tokenizers.whitespace,
local: ["(A)labama", "Alaska", "Arizona", "Arkansas"]
});
// initialize the bloodhound suggestion engine
engine.initialize();
$('#typeahead').typeahead(null, {
source: engine.ttAdapter()
});
Here is my fiddle: http://jsfiddle.net/ucUcn/6/
Any ideas why this is happening?

Answer 1

The local array must contain objects, not strings themself.
// instantiate the bloodhound suggestion engine
var engine = new Bloodhound({
datumTokenizer: Bloodhound.tokenizers.obj.whitespace('d'),
queryTokenizer: Bloodhound.tokenizers.whitespace,
local: [{
d: "(A)labama"
}, {
d: "Alaska"
}, {
d: "Arizona"
}, {
d: "Arkansas"
}]
});
// initialize the bloodhound suggestion engine
engine.initialize();
$('#typeahead').typeahead(null, {
displayKey: 'd',
source: engine.ttAdapter()
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="http://twitter.github.io/typeahead.js/releases/latest/typeahead.bundle.js"></script>
<input id="typeahead" />
Fiddle with above fix:
JsFiddle

Answer 2

As #Chad said, the result array must contains objects.
I only wanted to add that the default value used to display the suggestion is value
So you could do something like
var suggestionEngine = new Bloodhound({
datumTokenizer: Bloodhound.tokenizers.obj.whitespace('value'),
queryTokenizer: Bloodhound.tokenizers.whitespace,
remote: {
url: "myUrl",
filter: function (suggestions) {
var mappedResult = $.map(suggestions[1], function(suggestion) {
return { value : suggestion }
});
return mappedResult;
}
}
});