frontend: check in html, css, js

frontend/js/http.js

@@ -0,0 +1,31 @@
+(function (global, document) {
+
+  // Performs a JSON POST request to the given url with the given data and
+  // calls the callback function with the JSON response.
+  global.post = function(url, json, callback) {
+    $.ajax({
+      url: url,
+      type: "POST",
+      data: JSON.stringify(json),
+      success: function(data) {
+        var resp = JSON.parse(data);
+        callback(resp);
+      },
+    });
+  }
+
+
+  // Performs a GET request and calls the callback function with the JSON
+  // response.
+  global.get = function(url, callback) {
+    $.ajax({
+      url: url,
+      type: "GET",
+      success: function(data) {
+        var resp = JSON.parse(data);
+        callback(resp);
+      },
+    });
+  }
+
+} (window, document));