google_map_taxi_fare.user.js

google_map_taxi_fare.user.js

// ==UserScript==
// @name Google Map Taxi Fare
// @include http://www.google.co.jp/maps*
// ==/UserScript==

(function() {
  function showFare() {
    var routes = document.getElementById("dir_altroutes_body");
    if (routes) {
      Array.prototype.forEach.call(
        routes.getElementsByClassName("altroute-info"),
        function(e) {
          if ((" " + e.className + " ").indexOf(" fare-shown ") !== -1) {
            return;
          }
          var f = 710;
          var d = parseFloat(e.textContent) * 1000;
          if (isFinite(d)) {
            var t = d - 2000;
            if (t > 0) {
              f += (t / 288 | 0) * 90;
            }
            e.textContent += "、" + f + "円";
          }
          e.className += " fare-shown";
        }
      );
    }
  }
  showFare();
  document.addEventListener("DOMNodeInserted", function(event) {
    var e = event.target;
    if (e instanceof HTMLElement && e.getElementsByClassName("altroute-info")) {
      showFare();
    }
  }, false);
})();