--- a/index.html	Fri Aug 14 21:20:56 2015 +0900
+++ b/index.html	Thu Nov 19 02:19:03 2015 +0900
@@ -56,6 +56,13 @@
           <span id="result-bank"></span> IDR
           (<span id="rate-text"></span> IDR/JPY)
         </li>
+
+        <li>
+          Bank transfer (alt):
+          <span id="result-bank-bni"></span> IDR
+          (<span id="rate-text-bni"></span> IDR/JPY)
+        </li>
+
         <li>
           PayPal:
           <span id="result-paypal"></span> JPY
@@ -74,6 +81,7 @@
       <li>Perhitungan:
         <ul>
           <li>Bank: <code>jumlah &times; 1.07 &times; nilai_tukar</code>, dibulatkan ke seribuan terdekat.</li>
+          <li>Bank (alt): <code>jumlah &times; 1.01 &times; nilai_tukar + 25000</code>, dibulatkan ke seribuan terdekat.</li>
           <li>PayPal: <code>jumlah &times; 1.05</code>, dibulatkan ke satuan terdekat.</li>
         </ul>
       </li>
@@ -84,51 +92,95 @@
 
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
   <script>
-    // best javascript ahead. Proceed with care.
-    var
-      displayResult = function(x, rate) {
-        $("#rate-text").text(rate.toLocaleString())
-        $("#result-bank").text((Math.round(x * 1.07 * rate / 1000) * 1000).toLocaleString())
-        $("#result-paypal").text((Math.round(x * 1.05)).toLocaleString())
-        $("#ok").show()
-      },
-      loading = $("#loading"),
-      doButton = $("button[type=submit]"),
-      clearButton = $("button[type=reset]"),
-      unlock = function() {
-        loading.hide()
-        doButton.attr("disabled", false)
-      },
-      lock = function() {
-        loading.show()
-        doButton.attr("disabled", true)
-      },
-      xForm = $("#x"),
-      action = function(e) {
-        e.preventDefault()
-        $(".js").hide()
-        var x = parseFloat(xForm.val())
-        if (x === NaN || x === undefined) { return false; }
+    var input = function() { return parseFloat($xForm.val()); }
+
+    var $loading = $("#loading");
+    var $doButton = $("button[type=submit]");
+    var $xForm = $("#x");
+
+    var locks = {};
+    var lock = function(isLoading) {
+      if (!isLoading && locks.fixer === true && locks.bni === true) { return; }
+      $loading.toggle(isLoading);
+      $doButton.attr("disabled", isLoading);
+    };
+
+    var rates = {};
+
+    var displayResult = function() {
+      if (rates.fixer === undefined || rates.bni === undefined) { return; }
+      var x = input();
+
+      $("#rate-text").text(rates.fixer.toLocaleString());
+      $("#result-bank").text((Math.round(x * 1.07 * rates.fixer / 1000) * 1000).toLocaleString());
+
+      if (rates.bni !== 0) {
+        $("#rate-text-bni").text(rates.bni.toLocaleString());
+        $("#result-bank-bni").text((Math.ceil(x * 1.01 * rates.bni / 1000) * 1000 + 25000).toLocaleString());
+      } else {
+        $("#rate-text-bni").text('x');
+        $("#result-bank-bni").text('x');
+      };
+
+      $("#result-paypal").text((Math.round(x * 1.05)).toLocaleString());
+      $("#ok").show();
+      lock(false);
+    };
+
+    var action = function(e) {
+      e.preventDefault()
+      $(".js").hide()
+
+      var x = input();
+
+      if (x === NaN || x === undefined) { return false; };
 
-        if (window.rate === undefined) {
-          lock()
-          $.getJSON("https://api.fixer.io/latest", { base: "JPY", symbols: "IDR" })
-          .done(function(data) {
-            window.rate = data.rates["IDR"]
-            displayResult(x, window.rate)
-          })
-          .fail(function() {
-            $("#error").show()
-          })
-          .always(function() {
-            unlock()
-          })
-        } else {
-          displayResult(x, window.rate)
-        }
-      }
-    clearButton.click(function(e) { xForm.focus() })
-    doButton.click(action)
+      if (rates.fixer === undefined) {
+        lock(true);
+        locks.fixer = true;
+
+        $.getJSON("https://api.fixer.io/latest", { base: "JPY", symbols: "IDR" })
+        .done(function(data) {
+          rates.fixer = parseFloat(data.rates["IDR"]);
+
+          displayResult();
+        })
+        .fail(function() {
+          $("#error").show();
+        })
+        .always(function() {
+          locks.fixer = false;
+          lock(false);
+        });
+      };
+
+      if (rates.bni === undefined) {
+        lock(true);
+        locks.bni = true;
+
+        $.get("bni-jpyidr.txt")
+        .done(function(data) {
+          if (data === "") {
+            rates.bni = 0;
+          } else {
+            rates.bni = parseFloat(data);
+          }
+
+          displayResult();
+        })
+        .fail(function() {
+          $("#error").show();
+        })
+        .always(function() {
+          locks.bni = false;
+          lock(false);
+        });
+      };
+
+      displayResult();
+    };
+
     $("form").submit(action)
+    $("button[type=reset]").click(function(e) { xForm.focus(); });
   </script>
 </body>