A great library for adding typeahead support to your site is Twitter’s Typeahead.js. Even better is the excellent Bloodhound suggestion engine which comes with it. Sometimes though if you’re dealing with a remote suggestion engine like Elasticsearch’s completion suggester you don’t need to run remote results once again through another suggestion engine. Bypassing Bloodhound is as simple as hooking your own source function into your Typeahead definition.

$('input#keywords').typeahead({
  highlight: true,
},
{
  name: 'brands',
  display: 'value',
  source: function(query, syncResults, asyncResults) {
    $.get('/search?q=' + query, function(data) {
      asyncResults(data);
    });
  }
})