react app

react-app/node_modules/react/lib/getEventCharCode.js

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+/**
+ * Copyright 2013-2015, 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.
+ *
+ * @providesModule getEventCharCode
+ * @typechecks static-only
+ */
+
+'use strict';
+
+/**
+ * `charCode` represents the actual "character code" and is safe to use with
+ * `String.fromCharCode`. As such, only keys that correspond to printable
+ * characters produce a valid `charCode`, the only exception to this is Enter.
+ * The Tab-key is considered non-printable and does not have a `charCode`,
+ * presumably because it does not produce a tab-character in browsers.
+ *
+ * @param {object} nativeEvent Native browser event.
+ * @return {string} Normalized `charCode` property.
+ */
+function getEventCharCode(nativeEvent) {
+  var charCode;
+  var keyCode = nativeEvent.keyCode;
+
+  if ('charCode' in nativeEvent) {
+    charCode = nativeEvent.charCode;
+
+    // FF does not set `charCode` for the Enter-key, check against `keyCode`.
+    if (charCode === 0 && keyCode === 13) {
+      charCode = 13;
+    }
+  } else {
+    // IE8 does not implement `charCode`, but `keyCode` has the correct value.
+    charCode = keyCode;
+  }
+
+  // Some non-printable keys are reported in `charCode`/`keyCode`, discard them.
+  // Must not discard the (non-)printable Enter-key.
+  if (charCode >= 32 || charCode === 13) {
+    return charCode;
+  }
+
+  return 0;
+}
+
+module.exports = getEventCharCode;