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51 lines
1.5 KiB
51 lines
1.5 KiB
10 years ago
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/**
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* Copyright 2013-2015, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule getEventCharCode
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* @typechecks static-only
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*/
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'use strict';
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/**
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* `charCode` represents the actual "character code" and is safe to use with
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* `String.fromCharCode`. As such, only keys that correspond to printable
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* characters produce a valid `charCode`, the only exception to this is Enter.
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* The Tab-key is considered non-printable and does not have a `charCode`,
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* presumably because it does not produce a tab-character in browsers.
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*
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* @param {object} nativeEvent Native browser event.
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* @return {string} Normalized `charCode` property.
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*/
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function getEventCharCode(nativeEvent) {
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var charCode;
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var keyCode = nativeEvent.keyCode;
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if ('charCode' in nativeEvent) {
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charCode = nativeEvent.charCode;
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// FF does not set `charCode` for the Enter-key, check against `keyCode`.
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if (charCode === 0 && keyCode === 13) {
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charCode = 13;
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}
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} else {
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// IE8 does not implement `charCode`, but `keyCode` has the correct value.
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charCode = keyCode;
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}
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// Some non-printable keys are reported in `charCode`/`keyCode`, discard them.
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// Must not discard the (non-)printable Enter-key.
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if (charCode >= 32 || charCode === 13) {
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return charCode;
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}
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return 0;
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}
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module.exports = getEventCharCode;
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