[Components](https://oods-foundry.com/components) / viz.encoding

# VizOpacityControls

Edits the chart's opacity encoding.

Generated from @oods/foundry 0.10.1

- Categories

  viz.encoding

- Contexts

  form

- Readiness

  `react-and-vue`

## Playground

This component's contract doesn't list typed props, so the playground shows its documented example.

Documented example `VizOpacityControls` : choose 0.4, {"opacity":0.4}.

The render follows the page's theme switch: light, dark or high contrast. Both frameworks render the same example.

The real VizOpacityControls, live

React

Mark opacity

Opacity

Vue

Mark opacity

Opacity

Events it emits: change. Use either render above, and each event shows here with the framework that sent it.



## Code

The documented example. HTML is the markup the React component renders for it, which @oods/component-styles styles.

**React**

```
import { VizOpacityControls } from '@oods/components-react';
import '@oods/component-styles/css';

const value = {
  "opacity": 0.8
};

export function Example() {
  return (
    <VizOpacityControls
      value={value}
    />
  );
}
```

## Props, slots and events

Contract version 1.1.0. Types are from the React declarations in @oods/components-react.

Props

| Prop | Type | Required | Documented example |
| - | - | - | - |
| `title` | `string \| undefined` | no | |
| `value` | `VizIntentFragment \| undefined` | no | `{"opacity":0.8}` |
| `channel` | `"x" \| "y" \| undefined` | no | |
| `disabled` | `boolean \| undefined` | no | |

### Slots

none

### Events

change

## States

bound, editing, invalid, disabled

## Accessibility

- Role

  `combobox`

- How it gets its name

  `label` on `select[name="opacity"]`

### Keyboard

Keyboard

| Key | What it does |
| - | - |
| `Tab` | Focus the labelled chart input |

### Obligations in the contract

- Native labelled controls expose focus and invalid-edit feedback; successful edits emit a typed viz.render input fragment.

Mark opacity: controls the public Cartesian viz.render fragment, not the legacy HTML placeholder's unimplemented styling fields. The consumer supplies rows and calls the renderer. Opacity uses six bounded presets; fields/colors/scale/chart type preserve sibling input bindings. No consumer action is executed by this component.

## Tokens

The token roles this component reads.

- `input.background`
- `input.border`
- `input.text`
- `input.focus`
- `field.message`

## Readiness

The evidence recorded for this component, with its label.

`react-and-vue`: catalog_list gives this label when the React and Vue components have complete readiness evidence, but the sweep's generated apps don't use the component in both.

Readiness evidence

| Evidence | React | Vue |
| - | - | - |
| state | implemented-evidence-complete | implemented-evidence-complete |
| versioned contract | passed | passed |
| target implementation | passed | passed |
| package export | passed | passed |
| public declaration | passed | passed |
| dependency closure | passed | passed |
| framework scenario | passed | passed |
| accessibility | verified | verified |
| interaction | verified | verified |
| visual themes | verified | verified |

## Use your own

You can replace this component with your own React or Vue component. Map it, and generated code imports yours at the exact version you name. A contract report, run in a real browser, lists what your component met, what it didn't, and what wasn't checked.

The `component_map` call, with the parts in angle brackets yours to fill:

```
{
  "action": "create",
  "apply": true,
  "externalSystem": "<your design system>",
  "externalComponent": "<YourVizOpacityControls>",
  "oodsTraits": [
    "EncodingOpacity"
  ],
  "substitution": {
    "component": "VizOpacityControls",
    "react": {
      "package": "<your-package>/react",
      "version": "<exact version>",
      "export": "<YourVizOpacityControls>"
    },
    "vue": {
      "package": "<your-package>/vue",
      "version": "<exact version>",
      "export": "<YourVizOpacityControls>"
    }
  }
}
```

## How this page was made

Generated at build from the published data, each source with the hash of what was read. [The page's manifest](https://oods-foundry.com/components/viz-opacity-controls/manifest.json).

- **Contract**: `@oods/component-contracts@0.10.1 componentContracts.VizOpacityControls` `sha256:937c09f688e8…`
- **Documented example**: `@oods/component-contracts@0.10.1 sharedScenarios VizOpacityControls` `sha256:afa868282838…`
- **Catalog entry (catalog_list)**: `generated/0.10.1/system/catalog.json VizOpacityControls` `sha256:2dba7924762d…`
- **React readiness**: `@oods/components-react@0.10.1 readiness VizOpacityControls` `sha256:bcdd7ce5559c…`
- **Vue readiness**: `@oods/components-vue@0.10.1 readiness VizOpacityControls` `sha256:966e1582a518…`
- **Prop types**: `generated/0.10.1/components/prop-types.json VizOpacityControls` `sha256:3200947d11d0…`