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+---
+title: useHash
+tags: hooks,state,effect,advanced
+firstSeen: 2021-10-02T05:00:00-04:00
+---
+
+Tracks the browser's location hash value, and allows changin it.
+
+- Use the `useState()` hook to lazily get the `hash` property of the `Location` object.
+- Use the `useCallback()` hook to create a handler that updates the state.
+- Use the `useEffect()` hook to add a listener for the `'hashchange'` event when mounting and clean it up when unmounting.
+- Use the `useCallback()` hook to create a function that updates the `hash` property of the `Location` object with the given value.
+
+```jsx
+const useHash = () => {
+  const [hash, setHash] = React.useState(() => window.location.hash);
+
+  const hashChangeHandler = React.useCallback(() => {
+    setHash(window.location.hash);
+  }, []);
+
+  React.useEffect(() => {
+    window.addEventListener('hashchange', hashChangeHandler);
+    return () => {
+      window.removeEventListener('hashchange', hashChangeHandler);
+    };
+  }, []);
+
+  const updateHash = React.useCallback(
+    newHash => {
+      if (newHash !== hash) window.location.hash = newHash;
+    },
+    [hash]
+  );
+
+  return [hash, updateHash];
+};
+```
+
+```jsx
+const MyApp = () => {
+  const [hash, setHash] = useHash();
+
+  React.useEffect(() => {
+    setHash('#list');
+  }, []);
+
+  return (
+    <>
+      <p>window.location.href: {window.location.href}</p>
+      <p>Edit hash: </p>
+      <input value={hash} onChange={e => setHash(e.target.value)} />
+    </>
+  );
+};
+
+ReactDOM.render(<MyApp />, document.getElementById('root'));
+```