49 lines
1.4 KiB
Markdown
49 lines
1.4 KiB
Markdown
---
|
|
title: Uncontrolled select element
|
|
tags: components,input
|
|
cover: down-the-stream
|
|
firstSeen: 2018-12-10T10:48:03+02:00
|
|
lastUpdated: 2020-11-25T20:46:35+02:00
|
|
---
|
|
|
|
Renders an uncontrolled `<select>` element that uses a callback function to pass its value to the parent component.
|
|
|
|
- Use the the `selectedValue` prop as the `defaultValue` of the `<select>` element to set its initial value..
|
|
- Use the `onChange` event to fire the `onValueChange` callback and send the new value to the parent.
|
|
- Use `Array.prototype.map()` on the `values` array to create an `<option>` element for each passed value.
|
|
- Each item in `values` must be a 2-element array, where the first element is the `value` of the item and the second one is the displayed text for it.
|
|
|
|
```jsx
|
|
const Select = ({ values, onValueChange, selectedValue, ...rest }) => {
|
|
return (
|
|
<select
|
|
defaultValue={selectedValue}
|
|
onChange={({ target: { value } }) => onValueChange(value)}
|
|
{...rest}
|
|
>
|
|
{values.map(([value, text]) => (
|
|
<option key={value} value={value}>
|
|
{text}
|
|
</option>
|
|
))}
|
|
</select>
|
|
);
|
|
};
|
|
```
|
|
|
|
```jsx
|
|
const choices = [
|
|
['grapefruit', 'Grapefruit'],
|
|
['lime', 'Lime'],
|
|
['coconut', 'Coconut'],
|
|
['mango', 'Mango'],
|
|
];
|
|
ReactDOM.createRoot(document.getElementById('root')).render(
|
|
<Select
|
|
values={choices}
|
|
selectedValue="lime"
|
|
onValueChange={val => console.log(val)}
|
|
/>
|
|
);
|
|
```
|