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fix(useSize): prevents accessing iframe's property when it's not… (#443)

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fix(useSize): prevents accessing iframe's property when it's not defined
This commit is contained in:
Vadim Dalecky 2019-07-05 00:59:49 +02:00 committed by GitHub
commit 8f04e8fd5c
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1 changed files with 7 additions and 1 deletions
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8
src/useSize.tsx
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@ -45,7 +45,13 @@ const useSize = (
};
useEffect(() => {
const iframe: HTMLIFrameElement = ref.current!;
const iframe: HTMLIFrameElement = ref.current;
if(!iframe) {
// iframe will be undefined if component is already unmounted
return;
}
if (iframe.contentWindow) {
window = iframe.contentWindow!;
onWindow(window);