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277 changes: 42 additions & 235 deletions 16/umbraco-cms/customizing/extending-overview/extension-types/menu.md
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# Menu
---
description: >-
Create menus that appear throughout the backoffice, including in sidebars and button flyouts.
---

{% hint style="warning" %}
This page is a work in progress and may undergo further revisions, updates, or amendments. The information contained herein is subject to change without notice.
{% endhint %}
# Menus

Menu extensions contain one or more [menu item extensions](menu-item.md) and can appear throughout the backoffice, such as in sidebars and flyouts.

<figure><img src="../../../.gitbook/assets/menu.png" alt="" width="250"><figcaption><p>Menu</p></figcaption></figure>

## Creating a custom menu

In this section, you can learn how to register and create a custom Menu for the Umbraco backoffice.

### Manifest

The manifest file can be created using either JSON or TypeScript. Both methods are shown below.
Menu extensions can be created using either JSON or TypeScript. Both approaches are shown below.

{% tabs %}

{% tab title="JSON" %}

We can create the manifest using JSON in the `umbraco-package.json`.

{% code title="umbraco-package.json" %}
```json
{
"type": "menu",
"alias": "My.Menu",
"name": "My Menu"
"$schema": "../../umbraco-package-schema.json",
"name": "My Package",
"version": "0.1.0",
"extensions": [
{
"type": "menu",
"alias": "My.Menu",
"name": "My Menu"
}
]
}
```
{% endcode %}
{% endtab %}

{% tab title="TypeScript" %}
Extension authors define the menu manifest, then register it dynamically/during runtime using a [Backoffice Entry Point](../../extending-overview/extension-types/backoffice-entry-point.md) extension.

The manifest can also be written in TypeScript.

For this TypeScript example we used a [Backoffice Entry Point](../../extending-overview/extension-types/backoffice-entry-point.md) extension to register the manifests.

{% code title="my-menu/manifests.ts" %}
```typescript
import type { ManifestMenu } from '@umbraco-cms/backoffice/menu';

const menuManifest: Array<ManifestMenu> = [
{
type: 'menu',
alias: 'My.Menu',
name: 'My Menu'
}
];
```

{% endtab %}

{% endtabs %}

# Menu Item

<figure><img src="../../../.gitbook/assets/menu-item.png" alt="" width="250"><figcaption><p>Menu Item</p></figcaption></figure>

Menu items are the items that appear in the menu.

## Creating a custom menu items

In this section, you can learn how to add custom Menu Items to your Umbraco backoffice Menu.

### Manifest

To add custom menu items, you can define a single MenuItem manifest and link an element to it. In this element, you can fetch the data and render as many menu items as you want based on that data.

The code snippets below show how to declare a new menu item using JSON or TypeScript.

{% tabs %}

{% tab title="JSON" %}

We can create the manifest using JSON in the `umbraco-package.json`.

```json
{
"type": "menuItem",
"alias": "My.MenuItem",
"name": "My Menu Item",
"element": "./menu-items.ts",
"meta": {
"label": "My Menu Item",
"menus": ["My.Menu"]
}
}
```

{% endtab %}

{% tab title="TypeScript" %}

The manifest can also be written in TypeScript.

For this TypeScript example we used a [Backoffice Entry Point](../../extending-overview/extension-types/backoffice-entry-point.md) extension to register the manifests.

{% code title="manifest.ts" overflow="wrap" lineNumbers="true" %}
```typescript
const menuItemManifest: Array<ManifestMenuItem> = [
{
type: 'menuItem',
alias: 'My.MenuItem',
name: 'My Menu Item',
meta: {
label: 'My Menu Item',
menus: ["My.Menu"]
},
element: () => import('./menu-items.ts')
}
];
export const menuManifest: ManifestMenu = {
type: 'menu',
alias: 'My.Menu',
name: 'My Menu'
};
```
{% endcode %}


{% endtab %}

{% endtabs %}

### The UI Element

#### Rendering menu items with Umbraco's UI menu item component

To render your menu items in Umbraco, you can use the [Umbraco UI Menu Item component](https://uui.umbraco.com/?path=/docs/uui-menu-item--docs). This component allows you to create nested menu structures with a few lines of code.

By default, you can set the `has-children` attribute to display the caret icon indicating nested items. It will look like this: `?has-children=${bool}`.

**Example:**

```tsx
<uui-menu-item label="Menu Item 1" has-children>
<uui-menu-item label="Nested Menu Item 1"></uui-menu-item>
<uui-menu-item label="Nested Menu Item 2"></uui-menu-item>
</uui-menu-item>
```

#### Custom menu item element example

You can fetch the data and render the menu items using the Lit element above. By putting the result of the fetch in a `@state()`, we can trigger a re-render of the component when the data is fetched.

{% code title="menu-items.ts" overflow="wrap" lineNumbers="true" %}
{% code title="entrypoints/entrypoints.ts" %}
```typescript
import type { UmbMenuItemElement } from '@umbraco-cms/backoffice/menu';
import { UmbLitElement } from '@umbraco-cms/backoffice/lit-element';
import { html, TemplateResult, customElement, state } from '@umbraco-cms/backoffice/external/lit';
import { MyMenuItemResponseModel, MyMenuResource } from '../../../api';

const elementName = 'my-menu-item';

@customElement(elementName)
class MyMenuItems extends UmbLitElement implements UmbMenuItemElement {
@state()
private _items: MyMenuItemResponseModel[] = []; // Store fetched items

@state()
private _loading: boolean = true; // Track loading state

@state()
private _error: string | null = null; // Track any errors
import type {
UmbEntryPointOnInit,
} from "@umbraco-cms/backoffice/extension-api";
import { umbExtensionsRegistry } from "@umbraco-cms/backoffice/extension-registry";
import { menuManifest } from "./../my-menu/manifests.ts";

override firstUpdated() {
this.fetchInitialItems(); // Start fetching on component load
}

// Fetch initial items
async fetchInitialItems() {
try {
this._loading = true;
this._items = ((await MyMenuResource.getMenuApiV1()).items); // Fetch root-level items
} catch (e) {
this._error = 'Error fetching items';
} finally {
this._loading = false;
}
}

// Render items
renderItems(items: MyMenuItemResponseModel[]): TemplateResult {
return html`
${items.map(element => html`
<uui-menu-item label="${element.name}" ?has-children=${element.hasChildren}>
${element.type === 1
? html`<uui-icon slot="icon" name="icon-folder"></uui-icon>`
: html`<uui-icon slot="icon" name="icon-autofill"></uui-icon>`}
<!-- recursively render children -->
${element.hasChildren ? this.renderItems(element.children) : ''}
</uui-menu-item>
`)}
`;
}

// Main render function
override render() {
if (this._loading) {
return html`<uui-loader></uui-loader>`;
}

if (this._error) {
return html`<uui-menu-item active disabled label="Could not load form tree!">
</uui-menu-item>`;
}

// Render items if loading is done and no error occurred
return this.renderItems(this._items);
}
}

export { MyMenuItems as element };

declare global {
interface HTMLElementTagNameMap {
[elementName]: MyMenuItems;
}
}
export const onInit: UmbEntryPointOnInit = (_host, _extensionRegistry) => {
console.log("Hello from my extension πŸŽ‰");

umbExtensionsRegistry.register(menuManifest);
};
```
{% endcode %}
{% endtab %}
{% endtabs %}


## Tree Menu Item

### Manifest

```json
// it will be something like this
{
"type": "menuItem",
"kind": "tree",
"alias": "My.TreeMenuItem",
"name": "My Tree Menu Item",
"meta": {
"label": "My Tree Menu Item",
"menus": ["My.Menu"]
}
}
```

#### Default Element

The default element supports rendering a subtree of menu items.

```typescript
class UmbMenuItemTreeDefaultElement {}
```

### Adding menu items to an existing menu

The backoffice comes with a couple of menus.

* Content, Media, Settings, Templating, Dictionary, etc.

To add a menu item to an existing menu, you can use the `meta.menus` property.

```typescript
{
"type": "menuItem",
"alias": "My.MenuItem",
"name": "My Menu Item",
"meta": {
"label": "My Menu Item",
"menus": ["Umb.Menu.Content"]
}
}
```
## See Also
* [Section Sidebar](sections/section-sidebar.md) for information on creating menus for navigation within section extensions.
* [Menu Item](menu-item.md) for information on creating menu items.
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