44 lines
1.1 KiB
Markdown
44 lines
1.1 KiB
Markdown
---
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title: Controlled input field
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tags: components,input
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expertise: intermediate
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cover: blog_images/digital-nomad-5.jpg
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firstSeen: 2019-08-21T13:09:10+03:00
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lastUpdated: 2020-11-03T21:08:39+02:00
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---
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Renders a controlled `<input>` element that uses a callback function to inform its parent about value updates.
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- Use the `value` passed down from the parent as the controlled input field's value.
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- Use the `onChange` event to fire the `onValueChange` callback and send the new value to the parent.
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- The parent must update the input field's `value` prop in order for its value to change on user input.
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```jsx
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const ControlledInput = ({ value, onValueChange, ...rest }) => {
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return (
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<input
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value={value}
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onChange={({ target: { value } }) => onValueChange(value)}
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{...rest}
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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 Form = () => {
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const [value, setValue] = React.useState('');
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return (
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<ControlledInput
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type="text"
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placeholder="Insert some text here..."
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value={value}
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onValueChange={setValue}
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/>
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);
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};
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ReactDOM.render(<Form />, document.getElementById('root'));
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```
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