Initial check-in of tryconsole.

tryconsole/static/http.js

+// Copyright (c) 2009-2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Wrapper around asynchronous HTTP requests.
+ */
+
+/**
+ * Namespace for HTTP related functions.
+ */
+var http = {};
+
+/**
+ * Convert a dictionary to form suitable for HTTP POST requests.
+ * @param {dict} data A string -> string dict with parameters for the request.
+ * @return {string} An HTTP POST encoding of data.
+ */
+http.encodeFormData = function(data) {
+  var pairs = [];
+  var regexp = /%20/g;
+
+  for (var name in data) {
+    var value = data[name].toString();
+    var pair = encodeURIComponent(name).replace(regexp, '+') + '=' +
+               encodeURIComponent(value).replace(regexp, '+');
+    pairs.push(pair);
+  }
+
+  return pairs.join('&');
+};
+
+/*
+ * Make an asynchronous HTTP POST request.
+ * @param {string} url The url to request.
+ * @param {dict} values A dict of string -> string containing arguments to the
+ *     request.
+ * @param {function} callback A function to call with the result of the request.
+ * @param {function} errorHandler A function to call in the event of error.
+ */
+http.post = function(url, values, callback, errorHandler) {
+  var request = new XMLHttpRequest();
+  request.onreadystatechange = function() {
+    if (request.readyState == 4) {
+      if (request.status == 200) {
+        callback(request.responseText);
+      } else {
+        if (errorHandler != null) {
+          errorHandler(request.status, request.statusText);
+        } else {
+          callback(null);
+        }
+      }
+    }
+  };
+  request.open('POST', url);
+  request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
+  request.send(http.encodeFormData(values));
+};
+
+/*
+ * Make an asynchronous HTTP GET request.
+ * @param {string} url The url to request.
+ * @param {function} callback A function to call with the result of the request.
+ */
+http.getText = function(url, callback) {
+  var request = new XMLHttpRequest();
+  request.onreadystatechange = function() {
+    if (request.readyState == 4) {
+      if (request.status == 200) {
+        callback(request.responseText);
+      } else {
+        callback(null);
+      }
+    }
+  }
+  request.open('GET', url);
+  request.send(null);
+};