feat(angular): add custom injector support for modal and popover controllers (#30899)

Issue number: resolves #30638

---------

<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->

<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
When using `ModalController.create()` or `PopoverController.create()` in
Angular, components rendered inside overlays cannot access non-global
services or tokens from the component tree. For example, route-scoped
services or Angular's Dir directive for bidirectional text support are
not accessible from within a modal, requiring complex workarounds with
wrapper components.

## What is the new behavior?
`ModalController.create()` and `PopoverController.create()` now accept
an optional injector property that allows passing a custom Angular
Injector. This enables overlay components to access services and tokens
that are not available in the root injector, such as route-scoped
services or the Dir directive from Angular CDK.

```typescript
const customInjector = Injector.create({
  providers: [{ provide: MyService, useValue: myServiceInstance }],
  parent: this.injector,
});
```

```typescript
const modal = await this.modalController.create({
  component: MyModalComponent,
  injector: customInjector,
});
```

## Does this introduce a breaking change?

- [ ] Yes
- [X] No

<!--
  If this introduces a breaking change:
1. Describe the impact and migration path for existing applications
below.
  2. Update the BREAKING.md file with the breaking change.
3. Add "BREAKING CHANGE: [...]" to the commit description when merging.
See
https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#footer
for more information.
-->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

Current dev build:
```
8.7.17-dev.11769628168.11eca7cd
```

packages/angular/test/base/e2e/src/standalone/modal-custom-injector.spec.ts

@@ -0,0 +1,30 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Modal: Custom Injector', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/standalone/modal-custom-injector');
+  });
+
+  test('should inject custom service via custom injector', async ({ page }) => {
+    await page.locator('ion-button#open-modal-with-custom-injector').click();
+
+    await expect(page.locator('ion-modal')).toBeVisible();
+
+    const serviceValue = page.locator('#service-value');
+    await expect(serviceValue).toHaveText('Service Value: custom-injector-value');
+
+    await page.locator('#close-modal').click();
+    await expect(page.locator('ion-modal')).not.toBeVisible();
+  });
+
+  test('should fail without custom injector when service is not globally provided', async ({ page }) => {
+    page.on('dialog', async (dialog) => {
+      expect(dialog.message()).toContain('TestService not available');
+      await dialog.accept();
+    });
+
+    await page.locator('ion-button#open-modal-without-custom-injector').click();
+
+    await page.waitForEvent('dialog');
+  });
+});

packages/angular/test/base/e2e/src/standalone/popover-custom-injector.spec.ts

@@ -0,0 +1,16 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Popover: Custom Injector', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/standalone/popover-custom-injector');
+  });
+
+  test('should inject custom service via custom injector', async ({ page }) => {
+    await page.locator('ion-button#open-popover-with-custom-injector').click();
+
+    await expect(page.locator('ion-popover')).toBeVisible();
+
+    const serviceValue = page.locator('#service-value');
+    await expect(serviceValue).toHaveText('Service Value: custom-injector-value');
+  });
+});

packages/angular/test/base/src/app/standalone/app-standalone/app.routes.ts

@@ -22,6 +22,8 @@ export const routes: Routes = [
         ]
       },
       { path: 'programmatic-modal', loadComponent: () => import('../programmatic-modal/programmatic-modal.component').then(c => c.ProgrammaticModalComponent) },
+      { path: 'modal-custom-injector', loadComponent: () => import('../modal-custom-injector/modal-custom-injector.component').then(c => c.ModalCustomInjectorComponent) },
+      { path: 'popover-custom-injector', loadComponent: () => import('../popover-custom-injector/popover-custom-injector.component').then(c => c.PopoverCustomInjectorComponent) },
       { path: 'router-outlet', loadComponent: () => import('../router-outlet/router-outlet.component').then(c => c.RouterOutletComponent) },
       { path: 'back-button', loadComponent: () => import('../back-button/back-button.component').then(c => c.BackButtonComponent) },
       { path: 'router-link', loadComponent: () => import('../router-link/router-link.component').then(c => c.RouterLinkComponent) },

packages/angular/test/base/src/app/standalone/home-page/home-page.component.html

@@ -110,6 +110,11 @@
         Programmatic Modal Test
       </ion-label>
     </ion-item>
+    <ion-item routerLink="/standalone/modal-custom-injector">
+      <ion-label>
+        Modal Custom Injector Test
+      </ion-label>
+    </ion-item>
     <ion-item routerLink="/standalone/overlay-controllers">
       <ion-label>
         Overlay Controllers Test
@@ -120,6 +125,11 @@
         Popover Test
       </ion-label>
     </ion-item>
+    <ion-item routerLink="/standalone/popover-custom-injector">
+      <ion-label>
+        Popover Custom Injector Test
+      </ion-label>
+    </ion-item>
   </ion-list>
 
   <ion-list>

packages/angular/test/base/src/app/standalone/modal-custom-injector/modal-custom-injector.component.ts

@@ -0,0 +1,57 @@
+import { Component, inject, Injector } from '@angular/core';
+import { IonContent, IonHeader, IonTitle, IonToolbar, IonButton, ModalController } from '@ionic/angular/standalone';
+import { ModalCustomInjectorModalComponent } from './modal/modal.component';
+import { TestService } from './test.service';
+
+@Component({
+  selector: 'app-modal-custom-injector',
+  template: `
+    <ion-header>
+      <ion-toolbar>
+        <ion-title>Modal Custom Injector Test</ion-title>
+      </ion-toolbar>
+    </ion-header>
+    <ion-content class="ion-padding">
+      <ion-button id="open-modal-with-custom-injector" (click)="openWithCustomInjector()">
+        Open Modal with Custom Injector
+      </ion-button>
+      <ion-button id="open-modal-without-custom-injector" (click)="openWithoutCustomInjector()">
+        Open Modal without Custom Injector
+      </ion-button>
+    </ion-content>
+  `,
+  standalone: true,
+  imports: [IonContent, IonHeader, IonTitle, IonToolbar, IonButton]
+})
+export class ModalCustomInjectorComponent {
+  private modalController = inject(ModalController);
+  private injector = inject(Injector);
+
+  async openWithCustomInjector() {
+    const testService = new TestService();
+    testService.setValue('custom-injector-value');
+
+    const customInjector = Injector.create({
+      providers: [{ provide: TestService, useValue: testService }],
+      parent: this.injector,
+    });
+
+    const modal = await this.modalController.create({
+      component: ModalCustomInjectorModalComponent,
+      injector: customInjector,
+    });
+
+    await modal.present();
+  }
+
+  async openWithoutCustomInjector() {
+    try {
+      const modal = await this.modalController.create({
+        component: ModalCustomInjectorModalComponent,
+      });
+      await modal.present();
+    } catch (e) {
+      alert('Error: TestService not available without custom injector');
+    }
+  }
+}

packages/angular/test/base/src/app/standalone/modal-custom-injector/modal/modal.component.ts

@@ -0,0 +1,35 @@
+import { Component, OnInit, inject } from '@angular/core';
+import { IonContent, IonHeader, IonTitle, IonToolbar, IonButton, IonButtons } from '@ionic/angular/standalone';
+import { TestService } from '../test.service';
+
+@Component({
+  selector: 'app-modal-custom-injector-modal',
+  template: `
+    <ion-header>
+      <ion-toolbar>
+        <ion-title>Modal with Custom Injector</ion-title>
+        <ion-buttons slot="end">
+          <ion-button id="close-modal" (click)="dismiss()">Close</ion-button>
+        </ion-buttons>
+      </ion-toolbar>
+    </ion-header>
+    <ion-content>
+      <p id="service-value">Service Value: {{ serviceValue }}</p>
+    </ion-content>
+  `,
+  standalone: true,
+  imports: [IonContent, IonHeader, IonTitle, IonToolbar, IonButton, IonButtons]
+})
+export class ModalCustomInjectorModalComponent implements OnInit {
+  private testService = inject(TestService);
+  serviceValue = '';
+  modal: HTMLIonModalElement | undefined;
+
+  ngOnInit() {
+    this.serviceValue = this.testService.getValue();
+  }
+
+  dismiss() {
+    this.modal?.dismiss();
+  }
+}

packages/angular/test/base/src/app/standalone/modal-custom-injector/test.service.ts

@@ -0,0 +1,14 @@
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class TestService {
+  private value = 'default-value';
+
+  setValue(value: string) {
+    this.value = value;
+  }
+
+  getValue(): string {
+    return this.value;
+  }
+}

packages/angular/test/base/src/app/standalone/popover-custom-injector/popover-custom-injector.component.ts

@@ -0,0 +1,44 @@
+import { Component, inject, Injector } from '@angular/core';
+import { IonContent, IonHeader, IonTitle, IonToolbar, IonButton, PopoverController } from '@ionic/angular/standalone';
+import { PopoverCustomInjectorPopoverComponent } from './popover/popover.component';
+import { TestService } from './test.service';
+
+@Component({
+  selector: 'app-popover-custom-injector',
+  template: `
+    <ion-header>
+      <ion-toolbar>
+        <ion-title>Popover Custom Injector Test</ion-title>
+      </ion-toolbar>
+    </ion-header>
+    <ion-content class="ion-padding">
+      <ion-button id="open-popover-with-custom-injector" (click)="openWithCustomInjector($event)">
+        Open Popover with Custom Injector
+      </ion-button>
+    </ion-content>
+  `,
+  standalone: true,
+  imports: [IonContent, IonHeader, IonTitle, IonToolbar, IonButton]
+})
+export class PopoverCustomInjectorComponent {
+  private popoverController = inject(PopoverController);
+  private injector = inject(Injector);
+
+  async openWithCustomInjector(event: Event) {
+    const testService = new TestService();
+    testService.setValue('custom-injector-value');
+
+    const customInjector = Injector.create({
+      providers: [{ provide: TestService, useValue: testService }],
+      parent: this.injector,
+    });
+
+    const popover = await this.popoverController.create({
+      component: PopoverCustomInjectorPopoverComponent,
+      event: event,
+      injector: customInjector,
+    });
+
+    await popover.present();
+  }
+}

packages/angular/test/base/src/app/standalone/popover-custom-injector/popover/popover.component.ts

@@ -0,0 +1,22 @@
+import { Component, OnInit, inject } from '@angular/core';
+import { IonContent } from '@ionic/angular/standalone';
+import { TestService } from '../test.service';
+
+@Component({
+  selector: 'app-popover-custom-injector-popover',
+  template: `
+    <ion-content>
+      <p id="service-value">Service Value: {{ serviceValue }}</p>
+    </ion-content>
+  `,
+  standalone: true,
+  imports: [IonContent]
+})
+export class PopoverCustomInjectorPopoverComponent implements OnInit {
+  private testService = inject(TestService);
+  serviceValue = '';
+
+  ngOnInit() {
+    this.serviceValue = this.testService.getValue();
+  }
+}

packages/angular/test/base/src/app/standalone/popover-custom-injector/test.service.ts

@@ -0,0 +1,14 @@
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class TestService {
+  private value = 'default-value';
+
+  setValue(value: string) {
+    this.value = value;
+  }
+
+  getValue(): string {
+    return this.value;
+  }
+}