{
  "name": "My Property Editor",
  "extensions": [
    {
      "type": "propertyEditorUi",
      "alias": "My.PropertyEditorUi.Custom",
      "name": "My Custom Editor",
      "element": "/App_Plugins/MyEditor/editor.js",
      "elementName": "my-editor-ui",
      "meta": {
        "label": "My Custom Editor",
        "icon": "icon-edit",
        "group": "common",
        "propertyEditorSchemaAlias": "Umbraco.Plain.String"
      }
    }
  ]
}

import { LitElement, html, css, customElement, property } from '@umbraco-cms/backoffice/external/lit';
import { UmbElementMixin } from '@umbraco-cms/backoffice/element-api';
import { UmbChangeEvent } from '@umbraco-cms/backoffice/event';
import type { UmbPropertyEditorUiElement } from '@umbraco-cms/backoffice/property-editor';

@customElement('my-editor-ui')
export default class MyEditorElement extends UmbElementMixin(LitElement) implements UmbPropertyEditorUiElement {
  @property({ type: String })
  public value = '';

  #onChange(e: Event) {
    const input = e.target as HTMLInputElement;
    this.value = input.value;
    this.dispatchEvent(new UmbChangeEvent());
  }

  render() {
    return html`
      <uui-input
        .value=${this.value || ''}
        @change=${this.#onChange}
      ></uui-input>
    `;
  }

  static styles = css`
    :host {
      display: block;
    }
  `;
}

declare global {
  interface HTMLElementTagNameMap {
    'my-editor-ui': MyEditorElement;
  }
}

import type { UmbPropertyEditorConfigCollection } from '@umbraco-cms/backoffice/property-editor';

@customElement('my-editor-ui')
export default class MyEditorElement extends UmbElementMixin(LitElement) implements UmbPropertyEditorUiElement {
  @property({ type: String })
  public value = '';

  @state()
  private _maxChars?: number;

  @state()
  private _placeholder?: string;

  @property({ attribute: false })
  public set config(config: UmbPropertyEditorConfigCollection) {
    this._maxChars = config.getValueByAlias('maxChars');
    this._placeholder = config.getValueByAlias('placeholder');
  }

  render() {
    return html`
      <uui-input
        .value=${this.value || ''}
        .placeholder=${this._placeholder || ''}
        .maxlength=${this._maxChars}
        @change=${this.#onChange}
      ></uui-input>
    `;
  }
}

{
  "type": "propertyEditorUi",
  "alias": "My.PropertyEditorUi.Custom",
  "name": "My Custom Editor",
  "element": "/App_Plugins/MyEditor/editor.js",
  "elementName": "my-editor-ui",
  "meta": {
    "label": "My Custom Editor",
    "propertyEditorSchemaAlias": "Umbraco.Plain.String",
    "settings": {
      "properties": [
        {
          "alias": "maxChars",
          "label": "Maximum Characters",
          "propertyEditorUiAlias": "Umb.PropertyEditorUi.Integer"
        },
        {
          "alias": "placeholder",
          "label": "Placeholder Text",
          "propertyEditorUiAlias": "Umb.PropertyEditorUi.TextBox"
        }
      ],
      "defaultData": [
        { "alias": "maxChars", "value": 100 }
      ]
    }
  }
}