35 lines
931 B
Markdown
35 lines
931 B
Markdown
---
|
|
title: Toggle
|
|
tags: visual,state,beginner
|
|
---
|
|
|
|
Renders a toggle component.
|
|
|
|
* Use the `React.useState()` to initialize the `isToggleOn` state variable to `false`.
|
|
* Use an object, `style`, to hold the styles for individual components and their states.
|
|
* Return a `<button>` that alters the component's `isToggledOn` when its `onClick` event is fired and determine the appearance of the content based on `isToggleOn`, applying the appropriate CSS rules from the `style` object.
|
|
|
|
```jsx
|
|
function Toggle(props) {
|
|
const [isToggleOn, setIsToggleOn] = React.useState(false);
|
|
style = {
|
|
on: {
|
|
backgroundColor: 'green'
|
|
},
|
|
off: {
|
|
backgroundColor: 'grey'
|
|
}
|
|
};
|
|
|
|
return (
|
|
<button onClick={() => setIsToggleOn(!isToggleOn)} style={isToggleOn ? style.on : style.off}>
|
|
{isToggleOn ? 'ON' : 'OFF'}
|
|
</button>
|
|
);
|
|
}
|
|
```
|
|
|
|
```jsx
|
|
ReactDOM.render(<Toggle />, document.getElementById('root'));
|
|
```
|