# Fallback

**📖 Live documentation:** https://cds.coinbase.com/components/feedback/Fallback/?platform=mobile

A component that displays a fallback animation.

## Import

```tsx
import { Fallback } from '@coinbase/cds-mobile/layout/Fallback'
```

## Examples

### Basic example

```jsx
<VStack gap={1}>
  <Fallback width={150} height={45} />
  <Fallback width={65} height={45} percentage />
</VStack>
```

### Shape

The shape of the fallback can further be customized with the `shape` prop.

```jsx
<HStack gap={1}>
  <Fallback width={50} height={50} shape="square" />
  <Fallback width={50} height={50} shape="squircle" />
  <Fallback width={50} height={50} shape="circle" />
</HStack>
```

### Rectangular fallback width

If the fallback shape is a rectangle and the width is specified as a number, then by default, the width value will be recalculated and randomized within a predetermined threshold (e.g. to add some variety when multiple fallbacks are presented together). If this behavior is undesirable, randomization can be disabled with the `disableRandomRectWidth` prop.

Alternatively, you may create a rectangle width variant by setting a number value on the `rectWidthVariant` prop. Variants map to a predetermined set of width values, which are cycled through repeatedly when the set is exhausted. Therefore, it's still possible to achieve some variety, but in a deterministic manner.

```jsx
function RenderFallbacksInList() {
  const items = [{}, {}, {}, {}, {}];
  return (
    <VStack gap={1}>
      {items.map((_, i) => (
        <Fallback width={150} rectWidthVariant={i} />
      ))}
    </VStack>
  );
}
```

### Accessibility

Fallback has an `accessibilityLabel` prop to describe the loading state for assistive technologies. Wrap Fallback in a live region container to announce loading state changes.

```jsx
function AccessibleFallback() {
  const [isLoading, setIsLoading] = React.useState(true);

  return (
    <VStack gap={2}>
      <Box accessibilityLiveRegion="polite">
        {isLoading ? (
          <Fallback width={150} height={45} accessibilityLabel="Loading user profile" />
        ) : (
          <Text>Profile content here</Text>
        )}
      </Box>
      <Button onPress={() => setIsLoading(!isLoading)}>Toggle loading</Button>
    </VStack>
  );
}
```

If you render multiple Fallbacks in an area, you may use `aria-hidden` prop on each Fallback to disable individual announcements from assistive technologies. If you choose to do so, please add your own label in the parent container to indicate the loading state for the entire area. While the label element can be visually hidden, it is still crucial to mark the container as a live region for the label to be announced when state changes.

```jsx
function AccessibleFallbackGroup() {
  const [isLoading, setIsLoading] = React.useState(true);

  const visuallyHiddenStyle = {
    position: 'absolute',
    width: 1,
    height: 1,
    margin: -1,
    overflow: 'hidden',
  };

  return (
    <VStack gap={2}>
      <Box accessibilityLiveRegion="polite" position="relative">
        {isLoading ? (
          <>
            <Text style={visuallyHiddenStyle}>Loading table data</Text>
            <VStack gap={1}>
              <Fallback width={150} height={20} aria-hidden />
              <Fallback width={150} height={20} aria-hidden />
              <Fallback width={150} height={20} aria-hidden />
            </VStack>
          </>
        ) : (
          <Text>Table content here</Text>
        )}
      </Box>
      <Button onPress={() => setIsLoading(!isLoading)}>Toggle loading</Button>
    </VStack>
  );
}
```

## Props

| Prop | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `height` | `string \| number` | Yes | `-` | - |
| `width` | `null \| number \| AnimatedNode \| auto \| ${number}%` | Yes | `-` | - |
| `alignContent` | `flex-start \| flex-end \| center \| stretch \| space-between \| space-around \| space-evenly` | No | `-` | - |
| `alignItems` | `flex-start \| flex-end \| center \| stretch \| baseline` | No | `-` | - |
| `alignSelf` | `auto \| FlexAlignType` | No | `-` | - |
| `animated` | `boolean` | No | `-` | - |
| `aspectRatio` | `string \| number` | No | `-` | - |
| `background` | `currentColor \| fg \| fgMuted \| fgInverse \| fgPrimary \| fgWarning \| fgPositive \| fgNegative \| bg \| bgAlternate \| bgInverse \| bgOverlay \| bgElevation1 \| bgElevation2 \| bgPrimary \| bgPrimaryWash \| bgSecondary \| bgTertiary \| bgSecondaryWash \| bgNegative \| bgNegativeWash \| bgPositive \| bgPositiveWash \| bgWarning \| bgWarningWash \| bgLine \| bgLineHeavy \| bgLineInverse \| bgLinePrimary \| bgLinePrimarySubtle \| accentSubtleRed \| accentBoldRed \| accentSubtleGreen \| accentBoldGreen \| accentSubtleBlue \| accentBoldBlue \| accentSubtlePurple \| accentBoldPurple \| accentSubtleYellow \| accentBoldYellow \| accentSubtleGray \| accentBoldGray \| transparent` | No | `-` | - |
| `borderBottomLeftRadius` | `0 \| 100 \| 200 \| 300 \| 400 \| 500 \| 600 \| 700 \| 800 \| 900 \| 1000` | No | `-` | - |
| `borderBottomRightRadius` | `0 \| 100 \| 200 \| 300 \| 400 \| 500 \| 600 \| 700 \| 800 \| 900 \| 1000` | No | `-` | - |
| `borderBottomWidth` | `0 \| 100 \| 200 \| 300 \| 400 \| 500` | No | `-` | - |
| `borderColor` | `currentColor \| fg \| fgMuted \| fgInverse \| fgPrimary \| fgWarning \| fgPositive \| fgNegative \| bg \| bgAlternate \| bgInverse \| bgOverlay \| bgElevation1 \| bgElevation2 \| bgPrimary \| bgPrimaryWash \| bgSecondary \| bgTertiary \| bgSecondaryWash \| bgNegative \| bgNegativeWash \| bgPositive \| bgPositiveWash \| bgWarning \| bgWarningWash \| bgLine \| bgLineHeavy \| bgLineInverse \| bgLinePrimary \| bgLinePrimarySubtle \| accentSubtleRed \| accentBoldRed \| accentSubtleGreen \| accentBoldGreen \| accentSubtleBlue \| accentBoldBlue \| accentSubtlePurple \| accentBoldPurple \| accentSubtleYellow \| accentBoldYellow \| accentSubtleGray \| accentBoldGray \| transparent` | No | `-` | - |
| `borderEndWidth` | `0 \| 100 \| 200 \| 300 \| 400 \| 500` | No | `-` | - |
| `borderStartWidth` | `0 \| 100 \| 200 \| 300 \| 400 \| 500` | No | `-` | - |
| `borderTopLeftRadius` | `0 \| 100 \| 200 \| 300 \| 400 \| 500 \| 600 \| 700 \| 800 \| 900 \| 1000` | No | `-` | - |
| `borderTopRightRadius` | `0 \| 100 \| 200 \| 300 \| 400 \| 500 \| 600 \| 700 \| 800 \| 900 \| 1000` | No | `-` | - |
| `borderTopWidth` | `0 \| 100 \| 200 \| 300 \| 400 \| 500` | No | `-` | - |
| `borderWidth` | `0 \| 100 \| 200 \| 300 \| 400 \| 500` | No | `-` | - |
| `bordered` | `boolean` | No | `-` | Add a border around all sides of the box. |
| `borderedBottom` | `boolean` | No | `-` | Add a border to the bottom side of the box. |
| `borderedEnd` | `boolean` | No | `-` | Add a border to the trailing side of the box. |
| `borderedHorizontal` | `boolean` | No | `-` | Add a border to the leading and trailing sides of the box. |
| `borderedStart` | `boolean` | No | `-` | Add a border to the leading side of the box. |
| `borderedTop` | `boolean` | No | `-` | Add a border to the top side of the box. |
| `borderedVertical` | `boolean` | No | `-` | Add a border to the top and bottom sides of the box. |
| `bottom` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `color` | `currentColor \| fg \| fgMuted \| fgInverse \| fgPrimary \| fgWarning \| fgPositive \| fgNegative \| bg \| bgAlternate \| bgInverse \| bgOverlay \| bgElevation1 \| bgElevation2 \| bgPrimary \| bgPrimaryWash \| bgSecondary \| bgTertiary \| bgSecondaryWash \| bgNegative \| bgNegativeWash \| bgPositive \| bgPositiveWash \| bgWarning \| bgWarningWash \| bgLine \| bgLineHeavy \| bgLineInverse \| bgLinePrimary \| bgLinePrimarySubtle \| accentSubtleRed \| accentBoldRed \| accentSubtleGreen \| accentBoldGreen \| accentSubtleBlue \| accentBoldBlue \| accentSubtlePurple \| accentBoldPurple \| accentSubtleYellow \| accentBoldYellow \| accentSubtleGray \| accentBoldGray \| transparent` | No | `-` | - |
| `columnGap` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `dangerouslySetBackground` | `string` | No | `-` | - |
| `disableRandomRectWidth` | `boolean` | No | `-` | Disables randomization of rectangle shape width. |
| `display` | `flex \| none \| contents` | No | `-` | - |
| `elevation` | `0 \| 1 \| 2` | No | `-` | Determines box shadow styles. Parent should have overflow set to visible to ensure styles are not clipped. |
| `flexBasis` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `flexDirection` | `row \| column \| row-reverse \| column-reverse` | No | `-` | - |
| `flexGrow` | `number` | No | `-` | - |
| `flexShrink` | `number` | No | `-` | - |
| `flexWrap` | `wrap \| nowrap \| wrap-reverse` | No | `-` | - |
| `font` | `inherit \| FontFamily` | No | `-` | - |
| `fontFamily` | `inherit \| FontFamily` | No | `-` | - |
| `fontSize` | `inherit \| FontSize` | No | `-` | - |
| `fontWeight` | `inherit \| FontWeight` | No | `-` | - |
| `gap` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `justifyContent` | `flex-start \| flex-end \| center \| space-between \| space-around \| space-evenly` | No | `-` | - |
| `left` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `lineHeight` | `inherit \| LineHeight` | No | `-` | - |
| `margin` | `0 \| -1 \| -2 \| -3 \| -4 \| -5 \| -6 \| -7 \| -8 \| -9 \| -10 \| -0.25 \| -0.5 \| -0.75 \| -1.5` | No | `-` | - |
| `marginBottom` | `0 \| -1 \| -2 \| -3 \| -4 \| -5 \| -6 \| -7 \| -8 \| -9 \| -10 \| -0.25 \| -0.5 \| -0.75 \| -1.5` | No | `-` | - |
| `marginEnd` | `0 \| -1 \| -2 \| -3 \| -4 \| -5 \| -6 \| -7 \| -8 \| -9 \| -10 \| -0.25 \| -0.5 \| -0.75 \| -1.5` | No | `-` | - |
| `marginStart` | `0 \| -1 \| -2 \| -3 \| -4 \| -5 \| -6 \| -7 \| -8 \| -9 \| -10 \| -0.25 \| -0.5 \| -0.75 \| -1.5` | No | `-` | - |
| `marginTop` | `0 \| -1 \| -2 \| -3 \| -4 \| -5 \| -6 \| -7 \| -8 \| -9 \| -10 \| -0.25 \| -0.5 \| -0.75 \| -1.5` | No | `-` | - |
| `marginX` | `0 \| -1 \| -2 \| -3 \| -4 \| -5 \| -6 \| -7 \| -8 \| -9 \| -10 \| -0.25 \| -0.5 \| -0.75 \| -1.5` | No | `-` | - |
| `marginY` | `0 \| -1 \| -2 \| -3 \| -4 \| -5 \| -6 \| -7 \| -8 \| -9 \| -10 \| -0.25 \| -0.5 \| -0.75 \| -1.5` | No | `-` | - |
| `maxHeight` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `maxWidth` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `minHeight` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `minWidth` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `onPointerCancel` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerCancelCapture` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerDown` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerDownCapture` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerEnter` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerEnterCapture` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerLeave` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerLeaveCapture` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerMove` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerMoveCapture` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerUp` | `((event: PointerEvent) => void)` | No | `-` | - |
| `onPointerUpCapture` | `((event: PointerEvent) => void)` | No | `-` | - |
| `opacity` | `number \| AnimatedNode` | No | `-` | - |
| `overflow` | `visible \| hidden \| scroll` | No | `-` | - |
| `padding` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `paddingBottom` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `paddingEnd` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `paddingStart` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `paddingTop` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `paddingX` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `paddingY` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `pin` | `top \| bottom \| left \| right \| all` | No | `-` | Direction in which to absolutely pin the box. |
| `position` | `absolute \| relative \| static` | No | `-` | - |
| `rectWidthVariant` | `number` | No | `-` | When shape is a rectangle, creates a variant with deterministic width. Variants map to a predetermined set of width values, which are cycled through repeatedly when the set is exhausted. |
| `right` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `rowGap` | `0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 0.25 \| 0.5 \| 0.75 \| 1.5` | No | `-` | - |
| `shape` | `rectangle \| circle \| squircle \| square \| hexagon` | No | `rectangle` | - |
| `style` | `false \|  \| RegisteredStyle<ViewStyle> \| Value \| AnimatedInterpolation<string \| number> \| WithAnimatedObject<ViewStyle> \| WithAnimatedArray<Falsy \| ViewStyle \| RegisteredStyle<ViewStyle> \| RecursiveArray<Falsy \| ViewStyle \| RegisteredStyle<ViewStyle>> \| readonly (Falsy \| ViewStyle \| RegisteredStyle<ViewStyle>)[]> \| null` | No | `-` | - |
| `testID` | `string` | No | `-` | Used to locate this element in unit and end-to-end tests. Under the hood, testID translates to data-testid on Web. On Mobile, testID stays the same - testID Used to locate this view in end-to-end tests. |
| `textAlign` | `left \| right \| auto \| center \| justify` | No | `-` | - |
| `textDecorationLine` | `none \| underline \| line-through \| underline line-through` | No | `-` | - |
| `textDecorationStyle` | `solid \| dotted \| dashed \| double` | No | `-` | - |
| `textTransform` | `none \| capitalize \| uppercase \| lowercase` | No | `-` | - |
| `top` | `null \| number \| AnimatedNode \| auto \| ${number}%` | No | `-` | - |
| `transform` | `string \| readonly (({ scaleX: AnimatableNumericValue; } & { scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ scaleY: AnimatableNumericValue; } & { scaleX?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ translateX: AnimatableNumericValue \| ${number}%; } & { scaleX?: undefined; scaleY?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ translateY: AnimatableNumericValue \| ${number}%; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ perspective: AnimatableNumericValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ rotate: AnimatableStringValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ rotateX: AnimatableStringValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ rotateY: AnimatableStringValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ rotateZ: AnimatableStringValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ scale: AnimatableNumericValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; skewX?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ skewX: AnimatableStringValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewY?: undefined; matrix?: undefined; }) \| ({ skewY: AnimatableStringValue; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; matrix?: undefined; }) \| ({ matrix: AnimatableNumericValue[]; } & { scaleX?: undefined; scaleY?: undefined; translateX?: undefined; translateY?: undefined; perspective?: undefined; rotate?: undefined; rotateX?: undefined; rotateY?: undefined; rotateZ?: undefined; scale?: undefined; skewX?: undefined; skewY?: undefined; }))[]` | No | `-` | - |
| `userSelect` | `none \| auto \| text \| contain \| all` | No | `-` | - |
| `zIndex` | `number` | No | `-` | - |


