Get the latest bootstrap typeahead plugin v2.1.2 at https://raw.github.com/michaelcox/bootstrap/6789648b36aedaa795f1f5f11b4da6ab869f7f17/js/bootstrap-typeahead.js
This update will allow minLength of zero to enable show all for typeahead
<input id="typeaheadField" name="typeaheadField" type="text" placeholder="Start Typing">
$("#typeaheadField").typeahead({
minLength: 0,
items: 9999,
source: ["Alabama","Alaska","Arizona","Arkansas","California","Colorado", "Oregon"]
});
Then you have to attach the onFocus event to your element, because it's not defined by the plugin:
$("#typeaheadField").on('focus', $("#typeaheadField").typeahead.bind($("#typeaheadField"), 'lookup'));
it's a also a good idea to overwrite the bootstrap typeahead css class locally to set max-height and vertical scroll for the results in case there are too many results.
.typeahead {
max-height: 200px;
overflow-y: auto;
overflow-x: hidden;
}