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react/snippets/controlled-input.md

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+---
+title: Controlled input field
+type: snippet
+tags: [components,input]
+cover: digital-nomad-5
+dateModified: 2020-11-03T21:08:39+02:00
+---
+
+Renders a controlled `<input>` element that uses a callback function to inform its parent about value updates.
+
+- Use the `value` passed down from the parent as the controlled input field's value.
+- Use the `onChange` event to fire the `onValueChange` callback and send the new value to the parent.
+- The parent must update the input field's `value` prop in order for its value to change on user input.
+
+```jsx
+const ControlledInput = ({ value, onValueChange, ...rest }) => {
+  return (
+    <input
+      value={value}
+      onChange={({ target: { value } }) => onValueChange(value)}
+      {...rest}
+    />
+  );
+};
+```
+
+```jsx
+const Form = () => {
+  const [value, setValue] = React.useState('');
+
+  return (
+    <ControlledInput
+      type="text"
+      placeholder="Insert some text here..."
+      value={value}
+      onValueChange={setValue}
+    />
+  );
+};
+
+ReactDOM.createRoot(document.getElementById('root')).render(
+  <Form />
+);
+```