node_modules

1 files changed, 59 insertions, 0 deletions

diff --git a/node_modules/react-dom/lib/isEventSupported.js b/node_modules/react-dom/lib/isEventSupported.js
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+++ b/node_modules/react-dom/lib/isEventSupported.js
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+/**
+ * Copyright 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ */
+
+'use strict';
+
+var ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment');
+
+var useHasFeature;
+if (ExecutionEnvironment.canUseDOM) {
+  useHasFeature = document.implementation && document.implementation.hasFeature &&
+  // always returns true in newer browsers as per the standard.
+  // @see http://dom.spec.whatwg.org/#dom-domimplementation-hasfeature
+  document.implementation.hasFeature('', '') !== true;
+}
+
+/**
+ * Checks if an event is supported in the current execution environment.
+ *
+ * NOTE: This will not work correctly for non-generic events such as `change`,
+ * `reset`, `load`, `error`, and `select`.
+ *
+ * Borrows from Modernizr.
+ *
+ * @param {string} eventNameSuffix Event name, e.g. "click".
+ * @param {?boolean} capture Check if the capture phase is supported.
+ * @return {boolean} True if the event is supported.
+ * @internal
+ * @license Modernizr 3.0.0pre (Custom Build) | MIT
+ */
+function isEventSupported(eventNameSuffix, capture) {
+  if (!ExecutionEnvironment.canUseDOM || capture && !('addEventListener' in document)) {
+    return false;
+  }
+
+  var eventName = 'on' + eventNameSuffix;
+  var isSupported = eventName in document;
+
+  if (!isSupported) {
+    var element = document.createElement('div');
+    element.setAttribute(eventName, 'return;');
+    isSupported = typeof element[eventName] === 'function';
+  }
+
+  if (!isSupported && useHasFeature && eventNameSuffix === 'wheel') {
+    // This is the only way to test support for the `wheel` event in IE9+.
+    isSupported = document.implementation.hasFeature('Events.wheel', '3.0');
+  }
+
+  return isSupported;
+}
+
+module.exports = isEventSupported;
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