feat(NgComponentOutlet): add NgModule support to NgComponentOutlet directive (#14088)

Allow NgComponentOutlet to dynamically load a module, then load a component from
that module. Useful for lazy loading code, then add the lazy loaded code to the
page using NgComponentOutlet.

Closes #14043

modules/@angular/common/src/directives/ng_component_outlet.ts

@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ComponentFactoryResolver, ComponentRef, Directive, Injector, Input, OnChanges, Provider, SimpleChanges, Type, ViewContainerRef} from '@angular/core';
+import {ComponentFactoryResolver, ComponentRef, Directive, Injector, Input, NgModuleFactory, NgModuleRef, OnChanges, OnDestroy, Provider, SimpleChanges, Type, ViewContainerRef} from '@angular/core';
+
 
 
 /**
@@ -20,16 +21,17 @@ import {ComponentFactoryResolver, ComponentRef, Directive, Injector, Input, OnCh
  *
  * You can control the component creation process by using the following optional attributes:
  *
- * * `ngOutletInjector`: Optional custom {@link Injector} that will be used as parent for the
- * Component.
- * Defaults to the injector of the current view container.
+ * * `ngComponentOutletInjector`: Optional custom {@link Injector} that will be used as parent for
+ * the Component. Defaults to the injector of the current view container.
  *
- * * `ngOutletProviders`: Optional injectable objects ({@link Provider}) that are visible to the
- * component.
+ * * `ngComponentOutletProviders`: Optional injectable objects ({@link Provider}) that are visible
+ * to the component.
  *
- * * `ngOutletContent`: Optional list of projectable nodes to insert into the content
- * section of the component, if exists. ({@link NgContent}).
+ * * `ngComponentOutletContent`: Optional list of projectable nodes to insert into the content
+ * section of the component, if exists.
  *
+ * * `ngComponentOutletNgModuleFactory`: Optional module factory to allow dynamically loading other
+ * module, then load a component from that module.
  *
  * ### Syntax
  *
@@ -38,14 +40,20 @@ import {ComponentFactoryResolver, ComponentRef, Directive, Injector, Input, OnCh
  * <ng-container *ngComponentOutlet="componentTypeExpression"></ng-container>
  * ```
  *
- * Customized
+ * Customized injector/content
  * ```
  * <ng-container *ngComponentOutlet="componentTypeExpression;
  *                                   injector: injectorExpression;
- *                                   content: contentNodesExpression">
+ *                                   content: contentNodesExpression;">
  * </ng-container>
  * ```
  *
+ * Customized ngModuleFactory
+ * ```
+ * <ng-container *ngComponentOutlet="componentTypeExpression;
+ *                                   ngModuleFactory: moduleFactory;">
+ * </ng-container>
+ * ```
  * # Example
  *
  * {@example common/ngComponentOutlet/ts/module.ts region='SimpleExample'}
@@ -53,34 +61,55 @@ import {ComponentFactoryResolver, ComponentRef, Directive, Injector, Input, OnCh
  * A more complete example with additional options:
  *
  * {@example common/ngComponentOutlet/ts/module.ts region='CompleteExample'}
+
+ * A more complete example with ngModuleFactory:
+ *
+ * {@example common/ngComponentOutlet/ts/module.ts region='NgModuleFactoryExample'}
  *
  * @experimental
  */
 @Directive({selector: '[ngComponentOutlet]'})
-export class NgComponentOutlet implements OnChanges {
+export class NgComponentOutlet implements OnChanges, OnDestroy {
   @Input() ngComponentOutlet: Type<any>;
   @Input() ngComponentOutletInjector: Injector;
   @Input() ngComponentOutletContent: any[][];
+  @Input() ngComponentOutletNgModuleFactory: NgModuleFactory<any>;
 
-  componentRef: ComponentRef<any>;
+  private _componentRef: ComponentRef<any> = null;
+  private _moduleRef: NgModuleRef<any> = null;
 
-  constructor(
-      private _cmpFactoryResolver: ComponentFactoryResolver,
-      private _viewContainerRef: ViewContainerRef) {}
+  constructor(private _viewContainerRef: ViewContainerRef) {}
 
   ngOnChanges(changes: SimpleChanges) {
-    if (this.componentRef) {
-      this._viewContainerRef.remove(this._viewContainerRef.indexOf(this.componentRef.hostView));
+    if (this._componentRef) {
+      this._viewContainerRef.remove(this._viewContainerRef.indexOf(this._componentRef.hostView));
     }
     this._viewContainerRef.clear();
-    this.componentRef = null;
+    this._componentRef = null;
 
     if (this.ngComponentOutlet) {
       let injector = this.ngComponentOutletInjector || this._viewContainerRef.parentInjector;
 
-      this.componentRef = this._viewContainerRef.createComponent(
-          this._cmpFactoryResolver.resolveComponentFactory(this.ngComponentOutlet),
-          this._viewContainerRef.length, injector, this.ngComponentOutletContent);
+      if ((changes as any).ngComponentOutletNgModuleFactory) {
+        if (this._moduleRef) this._moduleRef.destroy();
+        if (this.ngComponentOutletNgModuleFactory) {
+          this._moduleRef = this.ngComponentOutletNgModuleFactory.create(injector);
+        } else {
+          this._moduleRef = null;
         }
       }
+      if (this._moduleRef) {
+        injector = this._moduleRef.injector;
+      }
+
+      let componentFactory =
+          injector.get(ComponentFactoryResolver).resolveComponentFactory(this.ngComponentOutlet);
+
+      this._componentRef = this._viewContainerRef.createComponent(
+          componentFactory, this._viewContainerRef.length, injector, this.ngComponentOutletContent);
+    }
+  }
+  ngOnDestroy() {
+    if (this._moduleRef) this._moduleRef.destroy();
+  }
 }

modules/@angular/common/test/directives/ng_component_outlet_spec.ts

@@ -8,8 +8,8 @@
 
 import {CommonModule} from '@angular/common';
 import {NgComponentOutlet} from '@angular/common/src/directives/ng_component_outlet';
-import {Component, ComponentRef, Inject, InjectionToken, Injector, NO_ERRORS_SCHEMA, NgModule, Optional, Provider, QueryList, ReflectiveInjector, TemplateRef, Type, ViewChild, ViewChildren, ViewContainerRef} from '@angular/core';
-import {TestBed, async} from '@angular/core/testing';
+import {Compiler, Component, ComponentRef, Inject, InjectionToken, Injector, NO_ERRORS_SCHEMA, NgModule, NgModuleFactory, Optional, Provider, QueryList, ReflectiveInjector, TemplateRef, Type, ViewChild, ViewChildren, ViewContainerRef} from '@angular/core';
+import {TestBed, async, fakeAsync} from '@angular/core/testing';
 import {expect} from '@angular/platform-browser/testing/matchers';
 
 export function main() {
@@ -143,6 +143,69 @@ export function main() {
          fixture.detectChanges();
          expect(fixture.nativeElement).toHaveText('projected foo');
        }));
+
+    it('should resolve components from other modules, if supplied', async(() => {
+         const compiler = TestBed.get(Compiler) as Compiler;
+         let fixture = TestBed.createComponent(TestComponent);
+
+         fixture.detectChanges();
+         expect(fixture.nativeElement).toHaveText('');
+
+         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
+         fixture.componentInstance.currentComponent = Module2InjectedComponent;
+
+         fixture.detectChanges();
+         expect(fixture.nativeElement).toHaveText('baz');
+       }));
+
+    it('should clean up moduleRef, if supplied', async(() => {
+         let destroyed = false;
+         const compiler = TestBed.get(Compiler) as Compiler;
+         const fixture = TestBed.createComponent(TestComponent);
+         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
+         fixture.componentInstance.currentComponent = Module2InjectedComponent;
+         fixture.detectChanges();
+
+         const moduleRef = fixture.componentInstance.ngComponentOutlet['_moduleRef'];
+         spyOn(moduleRef, 'destroy').and.callThrough();
+
+         expect(moduleRef.destroy).not.toHaveBeenCalled();
+         fixture.destroy();
+         expect(moduleRef.destroy).toHaveBeenCalled();
+       }));
+
+    it('should not re-create moduleRef when it didn\'t actually change', async(() => {
+         const compiler = TestBed.get(Compiler) as Compiler;
+         const fixture = TestBed.createComponent(TestComponent);
+         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
+         fixture.componentInstance.currentComponent = Module2InjectedComponent;
+         fixture.detectChanges();
+
+         expect(fixture.nativeElement).toHaveText('baz');
+
+         const moduleRef = fixture.componentInstance.ngComponentOutlet['_moduleRef'];
+         fixture.componentInstance.currentComponent = Module2InjectedComponent2;
+         fixture.detectChanges();
+
+         expect(fixture.nativeElement).toHaveText('baz2');
+         expect(moduleRef).toBe(fixture.componentInstance.ngComponentOutlet['_moduleRef']);
+       }));
+
+    it('should re-create moduleRef when changed', async(() => {
+         const compiler = TestBed.get(Compiler) as Compiler;
+         const fixture = TestBed.createComponent(TestComponent);
+         fixture.componentInstance.module = compiler.compileModuleSync(TestModule2);
+         fixture.componentInstance.currentComponent = Module2InjectedComponent;
+         fixture.detectChanges();
+
+         expect(fixture.nativeElement).toHaveText('baz');
+
+         fixture.componentInstance.module = compiler.compileModuleSync(TestModule3);
+         fixture.componentInstance.currentComponent = Module3InjectedComponent;
+         fixture.detectChanges();
+
+         expect(fixture.nativeElement).toHaveText('bat');
+       }));
   });
 }
 
@@ -158,15 +221,16 @@ class InjectedComponentAgain {
 }
 
 const TEST_CMP_TEMPLATE =
-    `<template *ngComponentOutlet="currentComponent; injector: injector; content: projectables"></template>`;
+    `<template *ngComponentOutlet="currentComponent; injector: injector; content: projectables; ngModuleFactory: module;"></template>`;
 @Component({selector: 'test-cmp', template: TEST_CMP_TEMPLATE})
 class TestComponent {
   currentComponent: Type<any>;
   injector: Injector;
   projectables: any[][];
+  module: NgModuleFactory<any>;
 
-  get cmpRef(): ComponentRef<any> { return this.ngComponentOutlet.componentRef; }
-  set cmpRef(value: ComponentRef<any>) { this.ngComponentOutlet.componentRef = value; }
+  get cmpRef(): ComponentRef<any> { return this.ngComponentOutlet['_componentRef']; }
+  set cmpRef(value: ComponentRef<any>) { this.ngComponentOutlet['_componentRef'] = value; }
 
   @ViewChildren(TemplateRef) tplRefs: QueryList<TemplateRef<any>>;
   @ViewChild(NgComponentOutlet) ngComponentOutlet: NgComponentOutlet;
@@ -182,3 +246,33 @@ class TestComponent {
 })
 export class TestModule {
 }
+
+@Component({selector: 'mdoule-2-injected-component', template: 'baz'})
+class Module2InjectedComponent {
+}
+
+@Component({selector: 'mdoule-2-injected-component-2', template: 'baz2'})
+class Module2InjectedComponent2 {
+}
+
+@NgModule({
+  imports: [CommonModule],
+  declarations: [Module2InjectedComponent, Module2InjectedComponent2],
+  exports: [Module2InjectedComponent, Module2InjectedComponent2],
+  entryComponents: [Module2InjectedComponent, Module2InjectedComponent2]
+})
+export class TestModule2 {
+}
+
+@Component({selector: 'mdoule-3-injected-component', template: 'bat'})
+class Module3InjectedComponent {
+}
+
+@NgModule({
+  imports: [CommonModule],
+  declarations: [Module3InjectedComponent],
+  exports: [Module3InjectedComponent],
+  entryComponents: [Module3InjectedComponent]
+})
+export class TestModule3 {
+}

modules/@angular/examples/common/ngComponentOutlet/ts/e2e_test/ngComponentOutlet_spec.ts

@@ -31,5 +31,13 @@ describe('ngComponentOutlet', () => {
       waitForElement('ng-component-outlet-complete-example');
       expect(element.all(by.css('complete-component')).getText()).toEqual(['Complete: Ahoj Svet!']);
     });
+
+    it('should render other module', () => {
+      browser.get(URL);
+      waitForElement('ng-component-outlet-other-module-example');
+      expect(element.all(by.css('other-module-component')).getText()).toEqual([
+        'Other Module Component!'
+      ]);
+    });
   });
 });

modules/@angular/examples/common/ngComponentOutlet/ts/module.ts

@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Component, Injectable, Injector, NgModule, ReflectiveInjector} from '@angular/core';
+import {CommonModule} from '@angular/common';
+import {Compiler, Component, Injectable, Injector, NgModule, NgModuleFactory, ReflectiveInjector} from '@angular/core';
 import {BrowserModule} from '@angular/platform-browser';
 
 
@@ -60,12 +61,34 @@ class NgTemplateOutletCompleteExample {
 }
 // #enddocregion
 
+// #docregion NgModuleFactoryExample
+@Component({selector: 'other-module-component', template: `Other Module Component!`})
+class OtherModuleComponent {
+}
+
+@Component({
+  selector: 'ng-component-outlet-other-module-example',
+  template: `
+    <ng-container *ngComponentOutlet="OtherModuleComponent;
+                                      ngModuleFactory: myModule;"></ng-container>`
+})
+class NgTemplateOutletOtherModuleExample {
+  // This field is necessary to expose OtherModuleComponent to the template.
+  OtherModuleComponent = OtherModuleComponent;
+  myModule: NgModuleFactory<any>;
+
+  constructor(compiler: Compiler) { this.myModule = compiler.compileModuleSync(OtherModule); }
+}
+// #enddocregion
+
 
 @Component({
   selector: 'example-app',
   template: `<ng-component-outlet-simple-example></ng-component-outlet-simple-example>
              <hr/>
-             <ng-component-outlet-complete-example></ng-component-outlet-complete-example>`
+             <ng-component-outlet-complete-example></ng-component-outlet-complete-example>
+             <hr/>
+             <ng-component-outlet-other-module-example></ng-component-outlet-other-module-example>`
 })
 class ExampleApp {
 }
@@ -73,11 +96,19 @@ class ExampleApp {
 @NgModule({
   imports: [BrowserModule],
   declarations: [
-    ExampleApp, NgTemplateOutletSimpleExample, NgTemplateOutletCompleteExample, HelloWorld,
-    CompleteComponent
+    ExampleApp, NgTemplateOutletSimpleExample, NgTemplateOutletCompleteExample,
+    NgTemplateOutletOtherModuleExample, HelloWorld, CompleteComponent
   ],
   entryComponents: [HelloWorld, CompleteComponent],
   bootstrap: [ExampleApp]
 })
 export class AppModule {
 }
+
+@NgModule({
+  imports: [CommonModule],
+  declarations: [OtherModuleComponent],
+  entryComponents: [OtherModuleComponent]
+})
+export class OtherModule {
+}

tools/public_api_guard/common/index.d.ts

@@ -118,13 +118,14 @@ export declare class NgClass implements DoCheck {
 }
 
 /** @experimental */
-export declare class NgComponentOutlet implements OnChanges {
-    componentRef: ComponentRef<any>;
+export declare class NgComponentOutlet implements OnChanges, OnDestroy {
     ngComponentOutlet: Type<any>;
     ngComponentOutletContent: any[][];
     ngComponentOutletInjector: Injector;
-    constructor(_cmpFactoryResolver: ComponentFactoryResolver, _viewContainerRef: ViewContainerRef);
+    ngComponentOutletNgModuleFactory: NgModuleFactory<any>;
+    constructor(_viewContainerRef: ViewContainerRef);
     ngOnChanges(changes: SimpleChanges): void;
+    ngOnDestroy(): void;
 }
 
 /** @stable */