# Custom View

When the existing Collection View kinds do not meet your requirements, you can create a custom Collection View from scratch.

## Manifest

{% code title="umbraco-package.json" %}

```json
{
  "type": "collectionView",
  "alias": "My.CollectionView.Alias",
  "name": "My Collection View",
  "element": "/App_Plugins/my-collection-view/my-collection-view.js",
  "meta": {
    "label": "Table",
    "icon": "icon-list",
    "pathName": "table"
  },
  "conditions": [
    {
      "alias": "Umb.Condition.CollectionAlias",
      "match": "Umb.Collection.Document" // Collection alias to display this collection view for
    }
  ]
}
```

{% endcode %}

## Implementation

Implement your Collection View as a Lit element that extends `UmbLitElement`. This defines how a list of entities is rendered in your collection.

{% code title="my-collection-view\.ts" %}

```typescript
import { css, customElement, html, state } from '@umbraco-cms/backoffice/external/lit';
import { UmbLitElement } from '@umbraco-cms/backoffice/lit-element';
import { UMB_DOCUMENT_COLLECTION_CONTEXT } from '@umbraco-cms/backoffice/document';
import type { UmbDocumentCollectionItemModel } from '@umbraco-cms/backoffice/document';
import type { UmbCollectionColumnConfiguration } from '@umbraco-cms/backoffice/collection';

@customElement('my-document-table-collection-view')
export class MyDocumentTableCollectionViewElement extends UmbLitElement {

    @state() private _columns: Array<{ name: string; alias: string; align?: string }> = [];
    @state() private _items?: Array<UmbDocumentCollectionItemModel> = [];

    constructor() {
        super();

        this.consumeContext(UMB_DOCUMENT_COLLECTION_CONTEXT, (collectionContext) => {
            collectionContext?.setupView(this);

            this.observe(collectionContext?.userDefinedProperties, (props) => {
                this.#createColumns(props);
            });

            this.observe(collectionContext?.items, (items) => {
                this._items = items;
            });
        });
    }

    #createColumns(userProps: Array<UmbCollectionColumnConfiguration> = []) {
        const baseCols = [
            { name: 'Name', alias: 'name' },
            { name: 'State', alias: 'state' },
        ];
        const userCols = userProps.map((p) => ({
            name: p.nameTemplate ?? p.alias,
            alias: p.alias,
        }));
        this._columns = [...baseCols, ...userCols, { name: '', alias: 'entityActions', align: 'right' }];
    }

    override render() {
        if (this._items === undefined) return html`<p>Not found...</p>`;
        return html`
            <table>
                <thead>
                    <tr>
                        ${this._columns.map((col) => html`<th style="text-align:${col.align ?? 'left'}">${col.name}</th>`)}
                    </tr>
                </thead>
                <tbody>
                    ${this._items.map(
            (item) => html`
                            <tr>
                                ${this._columns.map((col) => {
                switch (col.alias) {
                    case 'name':
                        return html`<td><a href="#">${item.name}</a></td>`;
                    case 'state':
                        return html`<td>${item.state}</td>`;
                    case 'sortOrder':
                        return html`<td>${item.sortOrder}</td>`;
                    case 'updateDate':
                        return html`<td>${item.updateDate}</td>`
                    case 'creator':
                        return html`<td>${item.creator}</td>`;
                    case 'entityActions':
                        return html`<td style="text-align:right;">⋮</td>`;
                    default:
                        const val = item.values.find((v) => v.alias === col.alias)?.value ?? '';
                        return html`<td>${val}</td>`;
                }
            })}
                            </tr>
                        `
        )}
                </tbody>
            </table>
        `;
    }

    static override styles = css`
        :host {
            display: block;
            width: 100%;
            overflow-x: auto;
            font-family: sans-serif;
        }
        table {
            width: 100%;
            border-collapse: collapse;
        }
        th,
        td {
            padding: 6px 10px;
            border: 1px solid #ddd;
            white-space: nowrap;
        }
        th {
            background: #f8f8f8;
            font-weight: 600;
        }
        a {
            color: var(--uui-color-interactive, #0366d6);
            text-decoration: none;
        }
        a:hover {
            text-decoration: underline;
        }
    `;
}

export default MyDocumentTableCollectionViewElement;

declare global {
    interface HTMLElementTagNameMap {
        'my-document-table-collection-view': MyDocumentTableCollectionViewElement;
    }
}
```

{% endcode %}

## Common Collection Match Values

Use the `match` property in your manifest to target a specific collection type.

| **Match Value**              | **Description**                                           |
| ---------------------------- | --------------------------------------------------------- |
| `Umb.Collection.Document`    | Targets the **Document** collection (content items).      |
| `Umb.Collection.Media`       | Targets the **Media** collection (images, videos, files). |
| `Umb.Collection.Member`      | Targets the **Member** collection.                        |
| `Umb.Collection.MemberGroup` | Targets the **Member Group** collection.                  |
| `Umb.Collection.User`        | Targets the **User** collection.                          |
| `Umb.Collection.UserGroup`   | Targets the **User Group** collection.                    |
| `Umb.Collection.Dictionary`  | Targets the **Dictionary** collection.                    |


---

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