Mantine UIFAQColors generator

Loader

Indicate loading state

Source

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Docs

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Package

@mantine/core

Usage

Loader component supports 3 types of loaders: oval, bars and dots by default. All loaders are animated with CSS for better performance.

Color
Size
Type
import { Loader } from '@mantine/core';

function Demo() {
  return <Loader color="blue" />;
}

Size prop

You can pass any valid CSS values and numbers to size prop. Numbers are treated as px, but converted to rem. For example, size={32} will produce --loader-size: 2rem CSS variable.

Size
import { Loader } from '@mantine/core';

function Demo() {
  return <Loader size={30} />;
}

Adding custom loaders

Loader component is used in other components (Button, ActionIcon, LoadingOverlay, etc.). You can change loader type with default props by setting type. You can also add a custom CSS or SVG loader with loaders default prop.

Custom CSS only loader

Note that in order for size and color props to work with custom loaders, you need to use --loader-size and --loader-color CSS variables in your loader styles.

import { MantineProvider, Loader } from '@mantine/core';
import { CssLoader } from './CssLoader';

const theme = createTheme({
  components: {
    Loader: Loader.extend({
      defaultProps: {
        loaders: { ...Loader.defaultLoaders, custom: CssLoader },
        type: 'custom',
      },
    }),
  },
});

function Demo() {
  return (
    <MantineThemeProvider theme={theme}>
      <Loader />
    </MantineThemeProvider>
  );
}

Custom SVG loader

It is recommended to use CSS only loaders, as SVG based animations may have the following issues:

  • High CPU usage – loader may look glitchy on low-end devices
  • Loader animation may not start playing until js is loaded – user may see static loader

In your SVG loader, you need to use --loader-size and --loader-color variables the same way as in CSS only custom loader in order for size and color props to work. Usually, you would need to set width and height to var(--loader-size) and fill/stroke to var(--loader-color).

import { MantineProvider, Loader } from '@mantine/core';
import { RingLoader } from './RingLoader';

const theme = createTheme({
  components: {
    Loader: Loader.extend({
      defaultProps: {
        loaders: { ...Loader.defaultLoaders, ring: RingLoader },
        type: 'ring',
      },
    }),
  },
});

function Demo() {
  return (
    <MantineThemeProvider theme={theme}>
      <Loader />
    </MantineThemeProvider>
  );
}

children prop

Loader supports children prop. If you pass anything to children, it will be rendered instead of the loader. This is useful when you want to control Loader representation in components that use loaderProps, for example Button, LoadingOverlay, Dropzone.

import { useDisclosure } from '@mantine/hooks';
import { LoadingOverlay, Button, Group, Box } from '@mantine/core';

function Demo() {
  const [visible, { toggle }] = useDisclosure(false);

  return (
    <>
      <Box pos="relative">
        <LoadingOverlay visible={visible} loaderProps={{ children: 'Loading...' }} />
        {/* ...other content */}
      </Box>

      <Group justify="center">
        <Button onClick={toggle}>Toggle overlay</Button>
      </Group>
    </>
  );
}

Alert

Notification