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+---
+title: useScript
+tags: hooks,effect,state,event,advanced
+firstSeen: 2021-10-08T05:00:00-04:00
+---
+
+Dynamically loads an external script.
+
+- Use the `useState()` hook to create a state variable for the load status of the script.
+- Use the `useEffect()` hook to handle all the logic for loading and unloading the script anytime the `src` changes.
+- If no `src` value is present, set the `status` to `'idle'` and return.
+- Use `Document.querySelector()` to check if a `<script>` element with the appropriate `src` value exists.
+- If no relevant element exists, use `Document.createElement()` to create one and give it the appropriate attributes.
+- Use the `data-status` attribute as a way to indicate the status of the script, setting it to `'loading'` initially.
+- If a relevant element exists, skip initialization and update the `status` from its `data-status` attribute. This ensures that no duplicate element will be created.
+- Use `EventTarget.addEventListener()` to listen for `'load'` and `'error'` events and handle them by updating the `data-status` attribute and the `status` state variable.
+- Finally, when the component unmounts, use `Document.removeEventListener()` to remove any listeners bound to the element.
+
+```jsx
+const useScript = src => {
+  const [status, setStatus] = React.useState(src ? 'loading' : 'idle');
+
+  React.useEffect(() => {
+    if (!src) {
+      setStatus('idle');
+      return;
+    }
+
+    let script = document.querySelector(`script[src="${src}"]`);
+
+    if (!script) {
+      script = document.createElement('script');
+      script.src = src;
+      script.async = true;
+      script.setAttribute('data-status', 'loading');
+      document.body.appendChild(script);
+
+      const setDataStatus = event => {
+        script.setAttribute(
+          'data-status',
+          event.type === 'load' ? 'ready' : 'error'
+        );
+      };
+      script.addEventListener('load', setDataStatus);
+      script.addEventListener('error', setDataStatus);
+    } else {
+      setStatus(script.getAttribute('data-status'));
+    }
+
+    const setStateStatus = event => {
+      setStatus(event.type === 'load' ? 'ready' : 'error');
+    };
+
+    script.addEventListener('load', setStateStatus);
+    script.addEventListener('error', setStateStatus);
+
+    return () => {
+      if (script) {
+        script.removeEventListener('load', setStateStatus);
+        script.removeEventListener('error', setStateStatus);
+      }
+    };
+  }, [src]);
+
+  return status;
+};
+```
+
+```jsx
+const script =
+  'data:text/plain;charset=utf-8;base64,KGZ1bmN0aW9uKCl7IGNvbnNvbGUubG9nKCdIZWxsbycpIH0pKCk7';
+
+const Child = () => {
+  const status = useScript(script);
+  return <p>Child status: {status}</p>;
+};
+
+const MyApp = () => {
+  const status = useScript(script);
+  return (
+    <>
+      <p>Parent status: {status}</p>
+      <Child />
+    </>
+  );
+};
+
+ReactDOM.render(<MyApp />, document.getElementById('root'));
+```