Sync getActiveElement module from FB.
Paul O’Shannessy committed
Oct 7, 2013 at 15:32 UTC
920c4206f4491b2b61a27559b88214292d89fc48
1 file changed
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src/vendor/core/dom/getActiveElement.js
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+/**
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+ * Copyright 2013 Facebook, Inc.
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ *
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+ * @providesModule getActiveElement
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+ * @typechecks
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+ */
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+
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+/**
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+ * Same as document.activeElement but wraps in a try-catch block. In IE it is
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+ * not safe to call document.activeElement if there is nothing focused.
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+ */
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+function getActiveElement() /*?DOMElement*/ {
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+ try {
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+ return document.activeElement;
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+ } catch (e) {
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+ return null;
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+ }
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+}
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+
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+module.exports = getActiveElement;
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+