xref: /docs/en/application-dev/reference/apis-arkui/arkui-ts/ts-basic-components-blank.md

# Blank

The **\<Blank>** component is able to automatically fill the empty spaces in the container along the main axis. It works only when the parent component is **\<Row>**, **\<Column>**, or **\<Flex>**.

>  **NOTE**
>
>  This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.


## Child Components

Not supported


## APIs

Blank(min?: number | string)

Since API version 10:
 - On the main axis of the parent container **\<Row>**, **\<Column>**, or **\<Flex>**, if the size of the **\<Blank>** component is not set, the component will be automatically stretched or shrunk; if the size is not set or the container adapts to the size of its child component, the component will not be stretched or shrunk.
 - Relationship between **size** and **min** of the **\<Blank>** component on the main axis: max(min, size).
 - On the cross axis of the parent container, if the size of the **\<Blank>** component is set, the component will not fill up the parent container; if the size is not set, the component will fill up the parent container, following the default **alignSelf** settings **ItemAlign.Stretch**.

This API can be used in ArkTS widgets since API version 9.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| min | number \| string | No| Minimum size of the **\<Blank>** component in the container along the main axis.<br>Default value: **0**<br>**NOTE**<br>This parameter cannot be set in percentage. If the value is negative, the default value is used. If the minimum size is larger than the available space of the container, it is used as the component size, and the component extends beyond the container.|

## Attributes

In addition to the [universal attributes](ts-universal-attributes-size.md), the following attributes are supported.

| Name| Type| Description|
| -------- | -------- | -------- |
| color | [ResourceColor](ts-types.md#resourcecolor) | Color to fill the empty spaces.<br>Default value: **Color.Transparent**<br>This API can be used in ArkTS widgets since API version 9.|

## Events

The [universal events](ts-universal-events-click.md) are supported.

## Example

### Example 1
The sample below shows how the **\<Blank>** component fills the empty spaces in the container in landscape and portrait modes.
```ts
// xxx.ets
@Entry
@Component
struct BlankExample {
  build() {
    Column() {
      Row() {
        Text('Bluetooth').fontSize(18)
        Blank()
        Toggle({ type: ToggleType.Switch }).margin({ top: 14, bottom: 14, left: 6, right: 6 })
      }.width('100%').backgroundColor(0xFFFFFF).borderRadius(15).padding({ left: 12 })
    }.backgroundColor(0xEFEFEF).padding(20)
  }
}
```

Portrait mode

![en-us_image_0000001256858407](figures/en-us_image_0000001256858407.gif)

Landscape mode

![en-us_image_0000001212378418](figures/en-us_image_0000001212378418.gif)


### Example 2
Set the **min** parameter when the width of the parent container of the **\<Blank>** component is not set.

```ts
// xxx.ets
@Entry
@Component
struct BlankExample {
  build() {
    Column({ space: 20 }) {
      // If the width of the parent container is not set, the \<Blank> component becomes invalid. In this case, you can set min to specify the minimum width of the \<Blank> component.
      Row() {
        Text('Bluetooth').fontSize(18)
        Blank().color(Color.Yellow)
        Toggle({ type: ToggleType.Switch }).margin({ top: 14, bottom: 14, left: 6, right: 6 })
      }.backgroundColor(0xFFFFFF).borderRadius(15).padding({ left: 12 })

      Row() {
        Text('Bluetooth').fontSize(18)
        // Set the minimum width to 160.
        Blank('160').color(Color.Yellow)
        Toggle({ type: ToggleType.Switch }).margin({ top: 14, bottom: 14, left: 6, right: 6 })
      }.backgroundColor(0xFFFFFF).borderRadius(15).padding({ left: 12 })

    }.backgroundColor(0xEFEFEF).padding(20).width('100%')
  }
}
```
If the width of the parent container is not set, set **min** to specify the minimum width of the **\<Blank>** component.

![blankmin](figures/blankmin.png)