What is this article about?
React Hooks are a new feature in React that allows you to use state and other React features in functional components instead of just class-based components. Before the introduction of hooks, functional components were only able to receive props and render the components.
Hooks provide a way to use state and other React features in functional components by allowing you to "hook into" React's features. React provides a few built-in hooks like useState, useEffect, useContext and useReducer that can be used to add state and other functionality to functional components.
In this article we are going to discuss about 10 custom hooks from Mantine.dev components library. Matine Hooks is a library for React that provides additional hooks for common functionality such as managing state, handling lifecycle events, and interacting with external APIs. It is an open-source project that aims to make it easier for developers to build complex and dynamic user interfaces using React.
01 useIdle
Detect if user is idle or active on page
import { useIdle } from '@mantine/hooks';
import { Badge } from '@mantine/core'; // optiona
function Demo() {
const idle = useIdle(2000);
return <Badge color={idle ? 'blue' : 'teal'}>Current state: {idle ? 'idle' : 'not idle'}</Badge>;
}
02 useClickOutside
Detect click and touch events outside of specified element , useful to close opened modals components
import { useState } from 'react';
import { Paper, Button } from '@mantine/core';
import { useClickOutside } from '@mantine/hooks';
function Demo() {
const [opened, setOpened] = useState(false);
const ref = useClickOutside(() => setOpened(false));
return (
<>
<Button onClick={() => setOpened(true)}>Open dropdown</Button>
{opened && (
<Paper ref={ref} shadow="sm">
<span>Click outside to close</span>
</Paper>
)}
</>
);
}
03 useOs
Detect user's operating system
import { useOs } from '@mantine/hooks';
function Demo() {
const os = useOs();
return <>Your os is <b>{os}</b></>;
}
04 useNetwork
Get current connection status
import { Text, Table } from '@mantine/core';
import { useNetwork } from '@mantine/hooks';
function Demo() {
const networkStatus = useNetwork();
return (
<Table sx={{ maxWidth: 300, tableLayout: 'fixed' }} mx="auto">
<thead>
<tr>
<th>Property</th>
<th>Value</th>
</tr>
</thead>
<tbody>
<tr>
<td>Online</td>
<td>
<Text size="sm" color={networkStatus.online ? 'teal' : 'red'}>
{networkStatus.online ? 'Online' : 'Offline'}
</Text>
</td>
</tr>
<tr>
<td>rtt</td>
<td>{networkStatus.rtt}</td>
</tr>
<tr>
<td>downlink</td>
<td>{networkStatus.downlink}</td>
</tr>
<tr>
<td>effectiveType</td>
<td>{networkStatus.effectiveType}</td>
</tr>
<tr>
<td>saveData</td>
<td>
<Text size="sm" color={networkStatus.saveData ? 'teal' : 'red'}>
{networkStatus.saveData ? 'true' : 'false'}
</Text>
</td>
</tr>
</tbody>
</Table>
);
}
05 useEyeDropper
Pick color from any pixel on the screen
import { useState } from 'react';
import { ActionIcon, Group, ColorSwatch, Text } from '@mantine/core';
import { IconColorPicker } from '@tabler/icons';
import { useEyeDropper } from '@mantine/hooks';
function Demo() {
const [color, setColor] = useState('');
const [error, setError] = useState(null);
const { supported, open } = useEyeDropper();
const pickColor = async () => {
try {
const { sRGBHex } = await open();
setColor(sRGBHex);
} catch (e) {
setError(e);
}
};
if (!supported) {
return <Text ta="center">EyeDropper API is not supported in your browser</Text>;
}
return (
<Group>
<ActionIcon variant="default" onClick={pickColor}>
<IconColorPicker size={16} stroke={1.5} />
</ActionIcon>
{color ? (
<Group spacing="xs">
<ColorSwatch color={color} />
<Text>Picked color: {color}</Text>
</Group>
) : (
<Text>Click the button to pick color</Text>
)}
{error && <Text color="red">Error: {error?.message}</Text>}
</Group>
);
}
06 useWindowScroll
Subscribe to window scroll and scroll smoothly to given position
import { useWindowScroll } from '@mantine/hooks';
import { Button, Text, Group } from '@mantine/core';
function Demo() {
const [scroll, scrollTo] = useWindowScroll();
return (
<Group position="center">
<Text>
Scroll position x: {scroll.x}, y: {scroll.y}
</Text>
<Button onClick={() => scrollTo({ y: 0 })}>Scroll to top</Button>
</Group>
);
}
07 useToggle
Switch between given values
import { Button } from '@mantine/core';
import { useToggle } from '@mantine/hooks';
function Demo() {
const [value, toggle] = useToggle(['blue', 'orange', 'cyan', 'teal']);
return (
<Button color={value} onClick={() => toggle()}>
{value}
</Button>
);
}
08 useLocalStorage
Use localStorage value as react state, sync state across opened tabs
import { useLocalStorage } from '@mantine/hooks';
import { ActionIcon, ColorScheme } from '@mantine/core';
import { IconSun, IconMoonStars } from '@tabler/icons';
function ColorSchemeToggle() {
const [colorScheme, setColorScheme] = useLocalStorage<ColorScheme>({
key: 'color-scheme',
defaultValue: 'light',
});
const toggleColorScheme = () =>
setColorScheme((current) => (current === 'dark' ? 'light' : 'dark'));
return (
<ActionIcon onClick={toggleColorScheme}>
{colorScheme === 'dark' ? <IconSun /> : <IconMoonStars />}
</ActionIcon>
);
}
09 useMediaQuery
Subscribe to media queries with window.matchMedia
import { Badge } from '@mantine/core';
import { useMediaQuery } from '@mantine/hooks';
function Demo() {
const matches = useMediaQuery('(min-width: 900px)');
return (
<Badge color={matches ? 'teal' : 'red'} variant="filled">
Breakpoint {matches ? 'matches' : 'does not match'}
</Badge>
);
}
10 useFullscreen
Enter/exit fullscreen with given element
import { useFullscreen } from '@mantine/hooks';
import { Button } from '@mantine/core';
function Demo() {
const { toggle, fullscreen } = useFullscreen();
return (
<Button onClick={toggle} color={fullscreen ? 'red' : 'blue'}>
{fullscreen ? 'Exit Fullscreen' : 'Enter Fullscreen'}
</Button>
);
}
Need more?
There are more than 40+ hooks are available.
Checkout here ð https://mantine.dev/hooks/use-counter/
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