Agent skill

umbraco-property-value-preset

Implement property value presets in Umbraco backoffice using official docs

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/umbraco-property-value-preset

SKILL.md

Umbraco Property Value Preset

What is it?

Property Value Presets provide default values when users create new content. They use an API to supply preset values for specific property editors, enabling streamlined content creation with sensible defaults. Multiple presets can work together using the weight property to progressively modify values.

Documentation

Always fetch the latest docs before implementing:

Workflow

  1. Fetch docs - Use WebFetch on the URLs above
  2. Ask questions - Which property editor? What default value? Static or dynamic?
  3. Generate files - Create manifest + preset API based on latest docs
  4. Explain - Show what was created and how to test

Minimal Examples

Manifest (manifests.ts)

typescript
import type { ManifestPropertyValuePreset } from '@umbraco-cms/backoffice/extension-registry';

const manifest: ManifestPropertyValuePreset = {
  type: 'propertyValuePreset',
  alias: 'My.PropertyValuePreset.DefaultText',
  name: 'Default Text Preset',
  api: () => import('./default-text-preset.js'),
  forPropertyEditorUiAlias: 'Umb.PropertyEditorUi.TextBox',
};

export const manifests = [manifest];

Preset Implementation (default-text-preset.ts)

typescript
import type { UmbPropertyValuePresetApi } from '@umbraco-cms/backoffice/property';

export class DefaultTextPreset implements UmbPropertyValuePresetApi {
  async processValue(value: unknown, config: unknown): Promise<unknown> {
    // Return default if no value exists
    return value ? value : 'Default text value';
  }

  destroy() {
    // Cleanup if needed
  }
}

export default DefaultTextPreset;

Dynamic Default Based on Config

typescript
import type { UmbPropertyValuePresetApi, UmbPropertyEditorConfigCollection } from '@umbraco-cms/backoffice/property';

export class DynamicPreset implements UmbPropertyValuePresetApi {
  async processValue(value: unknown, config: UmbPropertyEditorConfigCollection): Promise<unknown> {
    if (value) return value;

    // Use configuration to determine default
    const defaultFromConfig = config?.getValueByAlias('defaultValue');
    return defaultFromConfig || 'Fallback default';
  }

  destroy() {}
}

export default DynamicPreset;

Async Default (e.g., from API)

typescript
import type { UmbPropertyValuePresetApi } from '@umbraco-cms/backoffice/property';

export class ApiPreset implements UmbPropertyValuePresetApi {
  async processValue(value: unknown, config: unknown): Promise<unknown> {
    if (value) return value;

    // Fetch default from server
    const response = await fetch('/api/defaults/text');
    const data = await response.json();
    return data.defaultValue;
  }

  destroy() {}
}

export default ApiPreset;

Target by Schema Alias

typescript
const manifest: ManifestPropertyValuePreset = {
  type: 'propertyValuePreset',
  alias: 'My.PropertyValuePreset.JsonDefault',
  name: 'JSON Default Preset',
  api: () => import('./json-preset.js'),
  forPropertyEditorSchemaAlias: 'Umbraco.Plain.Json', // Target schema instead of UI
};

Multiple Presets with Weight

typescript
// First preset (runs first due to lower weight)
const basePreset: ManifestPropertyValuePreset = {
  type: 'propertyValuePreset',
  alias: 'My.PropertyValuePreset.Base',
  name: 'Base Preset',
  weight: 100,
  api: () => import('./base-preset.js'),
  forPropertyEditorUiAlias: 'Umb.PropertyEditorUi.TextBox',
};

// Second preset (runs after, can modify base value)
const enhancedPreset: ManifestPropertyValuePreset = {
  type: 'propertyValuePreset',
  alias: 'My.PropertyValuePreset.Enhanced',
  name: 'Enhanced Preset',
  weight: 200,
  api: () => import('./enhanced-preset.js'),
  forPropertyEditorUiAlias: 'Umb.PropertyEditorUi.TextBox',
};

Date Default Example

typescript
export class TodayDatePreset implements UmbPropertyValuePresetApi {
  async processValue(value: unknown, config: unknown): Promise<unknown> {
    if (value) return value;
    return new Date().toISOString().split('T')[0]; // Today's date
  }

  destroy() {}
}

export default TodayDatePreset;

That's it! Always fetch fresh docs, keep examples minimal, generate complete working code.

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