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30 lines
1.2 KiB
30 lines
1.2 KiB
/* |
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* Copyright 2020 Google LLC |
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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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* https://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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export const onHidden = (cb, once) => { |
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const onHiddenOrPageHide = (event) => { |
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if (event.type === 'pagehide' || document.visibilityState === 'hidden') { |
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cb(event); |
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if (once) { |
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removeEventListener('visibilitychange', onHiddenOrPageHide, true); |
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removeEventListener('pagehide', onHiddenOrPageHide, true); |
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} |
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} |
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}; |
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addEventListener('visibilitychange', onHiddenOrPageHide, true); |
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// Some browsers have buggy implementations of visibilitychange, |
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// so we use pagehide in addition, just to be safe. |
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addEventListener('pagehide', onHiddenOrPageHide, true); |
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};
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