Cached autocompletion of wikipedia page titles with jquery ui autocomplete plugin

completion.js

function cached_completer(completer) {
  var cache = {};
  return function(request, response) {
    if (request.term in cache) {
      response(cache[request.term]);
    } else {
      completer(request, function(resp) {
          cache[request.term] = resp;
          response(resp);
      });
    }
  };
}

var completers = {
  wikipedia_page_titles: cached_completer(function(request, response) {
    $.ajax({
        url: "http://en.wikipedia.org/w/api.php",
        data: {
          action: "opensearch",
          search: request.term,
          format: "json"
        },
        dataType: "jsonp",
        success: function(data) {
          response(data[1]);
        }
    });
  })
};

function autocompleteReady() {
  $(".wikipedia-name-search").autocomplete({
      minLength: 3,
      delay: 500,
      source: completers.wikipedia_page_titles});
}