type-ahead.js

Demos

Local

new TypeAhead(document.getElementById('type-ahead'), [
    'Asia', 'Africa', 'North America', 'South America', 'Antarctica', 'Europe', 'Australia'
]);

Server side

var t = new TypeAhead(document.getElementById('type-ahead')),
    xhr;

t.getCandidates = function (callback) {
    if (xhr) {
        xhr.abort();
    }

    xhr = $.getJSON('https://clients1.google.com/complete/search?client=youtube&tok=Iu2UFybBVjvwBqGBmnMaKw&callback=?&q=' + this.query, function (response) {
        var candidates = [];
        for (var i = 0; i < response[1].length; i++) {
            candidates.push(response[1][i][0]);
        }

        callback(candidates);
    });
};