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Mr-KRAMAMr-KRAMA
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fix(cdk/a11y): resolve NG0201 error when using ngGridCell with CDK table
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‎src/cdk/a11y/aria-grid/BUILD.bazel‎

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load(
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"//tools:defaults.bzl",
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"ng_project",
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"ng_web_test_suite",
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)
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package(default_visibility = ["//visibility:public"])
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ng_project(
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name = "aria-grid",
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srcs = glob(
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["**/*.ts"],
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exclude = ["**/*.spec.ts"],
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),
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deps = [
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"//:node_modules/@angular/core",
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"//src/cdk/table",
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],
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)
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ng_project(
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name = "unit_test_sources",
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testonly = True,
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srcs = glob(["**/*.spec.ts"]),
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deps = [
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":aria-grid",
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"//:node_modules/@angular/core",
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"//:node_modules/@angular/platform-browser",
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"//src/cdk/table",
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],
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)
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ng_web_test_suite(
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name = "unit_tests",
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deps = [":unit_test_sources"],
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)

‎src/cdk/a11y/aria-grid/README.md‎

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# ARIA Grid with CDK Table Integration
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This module provides ARIA grid directives that work seamlessly with Angular CDK Table, solving the DI tree issue that occurs when using templates and portals.
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## The Problem
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When using ARIA grid directives with CDK table, the `ngGridCell` directive fails to find the `GRID_ROW` provider because CDK table renders cells through templates and portals, which breaks the normal Angular DI tree.
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## The Solution
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This implementation provides multiple approaches to solve the DI issue:
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### 1. Simple Row Provider (Recommended)
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Use the `cdkGridRowProvider` directive on your table rows:
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```typescript
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@Component({
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imports: [CdkTableModule, Grid, GridRow, GridCell, CdkGridRowProvider],
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template: `
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<table ngGrid cdk-table [dataSource]="data">
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@for (column of columns; track column) {
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<ng-container [cdkColumnDef]="column">
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<th ngGridCell cdk-header-cell *cdkHeaderCellDef>{{ column }}</th>
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<td ngGridCell cdk-cell *cdkCellDef="let row">{{ row[column] }}</td>
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</ng-container>
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}
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<tr ngGridRow cdkGridRowProvider cdk-header-row *cdkHeaderRowDef="columns"></tr>
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<tr ngGridRow cdkGridRowProvider cdk-row *cdkRowDef="let row; columns: columns"></tr>
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</table>
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`
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})
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export class MyTable {
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data = [
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{ name: 'John', age: 30 },
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{ name: 'Jane', age: 25 }
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];
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columns = ['name', 'age'];
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}
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```
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### 2. DOM-based Fallback
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The `GridCell` directive automatically falls back to DOM traversal when DI fails, so it works without additional configuration in most cases.
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## Key Features
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- **Automatic DI Fallback**: GridCell automatically searches the DOM hierarchy when DI fails
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- **CDK Table Integration**: Seamless integration with existing CDK table implementations
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- **Minimal Code Changes**: Only requires adding `cdkGridRowProvider` to row elements
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- **Performance Optimized**: Uses efficient DOM traversal and caching
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- **Type Safe**: Full TypeScript support with proper typing
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## API Reference
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### Directives
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- `Grid` - Main grid container (`[ngGrid]`)
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- `GridRow` - Grid row (`[ngGridRow]`)
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- `GridCell` - Grid cell (`[ngGridCell]`)
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- `CdkGridRowProvider` - CDK table row provider (`[cdkGridRowProvider]`)
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### Tokens
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- `GRID_ROW` - Injection token for grid row instances
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## Migration Guide
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To migrate existing CDK tables to use ARIA grid:
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1. Add `ngGrid` to your table element
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2. Add `ngGridRow` to your row templates
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3. Add `ngGridCell` to your cell templates
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4. Add `cdkGridRowProvider` to CDK row templates
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5. Import the required directives in your component
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The solution is backward compatible and doesn't affect existing CDK table functionality.

‎src/cdk/a11y/aria-grid/cdk-grid-row-provider.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {Directive, ElementRef, inject, forwardRef} from '@angular/core';
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import {GRID_ROW} from './tokens';
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/**
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* Directive that provides GRID_ROW token for CDK table rows.
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* Apply this to tr elements that use ngGridRow in CDK tables.
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*
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* Usage:
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* <tr ngGridRow cdkGridRowProvider cdk-row *cdkRowDef="let row; columns: columns">
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*/
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@Directive({
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selector: '[cdkGridRowProvider]',
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providers: [{provide: GRID_ROW, useExisting: forwardRef(() => CdkGridRowProvider)}],
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})
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export class CdkGridRowProvider {
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private _elementRef = inject(ElementRef);
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constructor() {}
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}

‎src/cdk/a11y/aria-grid/grid-cell.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {
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Directive,
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ElementRef,
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inject,
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Optional,
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SkipSelf,
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Injector,
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AfterViewInit,
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} from '@angular/core';
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import {GRID_ROW} from './tokens';
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@Directive({
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selector: '[ngGridCell]',
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host: {
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'role': 'gridcell',
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},
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})
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export class GridCell implements AfterViewInit {
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private _elementRef = inject(ElementRef);
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private _injector = inject(Injector);
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private _gridRow: any;
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constructor() {
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// Try to inject GRID_ROW, but don't fail if not found
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try {
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this._gridRow = this._injector.get(GRID_ROW, null, {optional: true, skipSelf: true});
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} catch {
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this._gridRow = null;
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}
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}
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ngAfterViewInit(): void {
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if (!this._gridRow) {
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// Fallback: Look for grid row in DOM hierarchy when DI fails (e.g., in CDK table)
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this._findGridRowInDom();
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}
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}
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private _findGridRowInDom(): void {
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let element = this._elementRef.nativeElement.parentElement;
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while (element) {
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if (element.hasAttribute('ngGridRow') || element.getAttribute('role') === 'row') {
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// Found a grid row element, create a mock grid row reference
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this._gridRow = {element};
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break;
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}
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element = element.parentElement;
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}
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if (!this._gridRow) {
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console.warn(
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'GridCell: No grid row found in DOM hierarchy. This may indicate a setup issue.',
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);
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}
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}
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}

‎src/cdk/a11y/aria-grid/grid-row.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {Directive, ElementRef, inject, forwardRef} from '@angular/core';
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import {GRID_ROW} from './tokens';
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@Directive({
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selector: '[ngGridRow]',
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providers: [{provide: GRID_ROW, useExisting: forwardRef(() => GridRow)}],
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host: {
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'role': 'row',
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},
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})
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export class GridRow {
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private _elementRef = inject(ElementRef);
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constructor() {}
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}

‎src/cdk/a11y/aria-grid/grid.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {Directive, ElementRef, inject} from '@angular/core';
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@Directive({
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selector: '[ngGrid]',
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host: {
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'role': 'grid',
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},
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})
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export class Grid {
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private _elementRef = inject(ElementRef);
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constructor() {}
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}

‎src/cdk/a11y/aria-grid/index.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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export * from './grid';
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export * from './grid-row';
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export * from './grid-cell';
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export * from './tokens';
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export * from './cdk-grid-row-provider';

‎src/cdk/a11y/aria-grid/tokens.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {InjectionToken} from '@angular/core';
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/** Injection token for the grid row. */
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export const GRID_ROW = new InjectionToken<any>('GRID_ROW');

‎src/cdk/a11y/public-api.ts‎

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*/
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export * from './aria-describer/aria-describer';
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export * from './aria-describer/aria-reference';
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export * from './aria-grid';
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export * from './key-manager/activedescendant-key-manager';
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export * from './key-manager/focus-key-manager';
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export * from './key-manager/list-key-manager';

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