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+---
+title: Closable alert
+tags: components,state,effect
+cover: flower-portrait-1
+firstSeen: 2019-09-17T13:19:30+03:00
+lastUpdated: 2021-01-07T23:57:13+02:00
+---
+
+Renders an alert component with `type` prop.
+
+- Use the `useState()` hook to create the `isShown` and `isLeaving` state variables and set both to `false` initially.
+- Define `timeoutId` to keep the timer instance for clearing on component unmount.
+- Use the `useEffect()` hook to update the value of `isShown` to `true` and clear the interval by using `timeoutId` when the component is unmounted.
+- Define a `closeAlert` function to set the component as removed from the DOM by displaying a fading out animation and set `isShown` to `false` via `setTimeout()`.
+
+```css
+@keyframes leave {
+  0% { opacity: 1 }
+  100% { opacity: 0 }
+}
+
+.alert {
+  padding: 0.75rem 0.5rem;
+  margin-bottom: 0.5rem;
+  text-align: left;
+  padding-right: 40px;
+  border-radius: 4px;
+  font-size: 16px;
+  position: relative;
+}
+
+.alert.warning {
+  color: #856404;
+  background-color: #fff3cd;
+  border-color: #ffeeba;
+}
+
+.alert.error {
+  color: #721c24;
+  background-color: #f8d7da;
+  border-color: #f5c6cb;
+}
+
+.alert.leaving {
+  animation: leave 0.5s forwards;
+}
+
+.alert .close {
+  position: absolute;
+  top: 0;
+  right: 0;
+  padding: 0 0.75rem;
+  color: #333;
+  border: 0;
+  height: 100%;
+  cursor: pointer;
+  background: none;
+  font-weight: 600;
+  font-size: 16px;
+}
+
+.alert .close::after {
+  content: 'x';
+}
+```
+
+```jsx
+const Alert = ({ isDefaultShown = false, timeout = 250, type, message }) => {
+  const [isShown, setIsShown] = React.useState(isDefaultShown);
+  const [isLeaving, setIsLeaving] = React.useState(false);
+
+  let timeoutId = null;
+
+  React.useEffect(() => {
+    setIsShown(true);
+    return () => {
+      clearTimeout(timeoutId);
+    };
+  }, [isDefaultShown, timeout, timeoutId]);
+
+  const closeAlert = () => {
+    setIsLeaving(true);
+    timeoutId = setTimeout(() => {
+      setIsLeaving(false);
+      setIsShown(false);
+    }, timeout);
+  };
+
+  return (
+    isShown && (
+      <div
+        className={`alert ${type} ${isLeaving ? 'leaving' : ''}`}
+        role="alert"
+      >
+        <button className="close" onClick={closeAlert} />
+        {message}
+      </div>
+    )
+  );
+};
+```
+
+```jsx
+ReactDOM.createRoot(document.getElementById('root')).render(
+  <Alert type="info" message="This is info" />
+);
+```