52 lines
1.2 KiB
Markdown
52 lines
1.2 KiB
Markdown
---
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title: React useTitle hook
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tags: hooks,effect
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expertise: intermediate
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author: chalarangelo
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cover: blog_images/blue-lake.jpg
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firstSeen: 2021-09-27T05:00:00-04:00
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---
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Sets the title of the page
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- Use `typeof` to determine if the `Document` is defined or not.
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- Use the `useRef()` hook to store the original title of the `Document`, if defined.
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- Use the `useEffect()` hook to set `Document.title` to the passed value when the component mounts and clean up when unmounting.
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```jsx
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const useTitle = title => {
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const documentDefined = typeof document !== 'undefined';
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const originalTitle = React.useRef(documentDefined ? document.title : null);
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React.useEffect(() => {
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if (!documentDefined) return;
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if (document.title !== title) document.title = title;
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return () => {
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document.title = originalTitle.current;
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};
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}, []);
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};
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```
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```jsx
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const Alert = () => {
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useTitle('Alert');
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return <p>Alert! Title has changed</p>;
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};
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const MyApp = () => {
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const [alertOpen, setAlertOpen] = React.useState(false);
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return (
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<>
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<button onClick={() => setAlertOpen(!alertOpen)}>Toggle alert</button>
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{alertOpen && <Alert />}
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</>
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);
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};
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ReactDOM.render(<MyApp />, document.getElementById('root'));
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```
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