我想动态创建一个模板。这应该用于在运行时构建ComponentType,并将其放置(甚至替换)到宿主组件内部的某个位置。

直到RC4我使用ComponentResolver,但与RC5我得到以下消息:

ComponentResolver is deprecated for dynamic compilation.
Use ComponentFactoryResolver together with @NgModule/@Component.entryComponents or ANALYZE_FOR_ENTRY_COMPONENTS provider instead.
For runtime compile only, you can also use Compiler.compileComponentSync/Async.

我找到了这个文档(Angular 2同步动态组件创建)

你要明白我可以用任何一种

一种带有ComponentFactoryResolver的动态ngIf。如果我在@Component({entryComponents: [comp1, comp2],…})内部传递已知的组件-我可以使用.resolveComponentFactory(componentToRender); 真正的运行时编译,使用编译器…

但问题是如何使用编译器?上面的说明说,我应该调用:Compiler.compileComponentSync/Async -那么如何?

为例。我想为一种设置创建(基于一些配置条件)这种模板

<form>
   <string-editor
     [propertyName]="'code'"
     [entity]="entity"
   ></string-editor>
   <string-editor
     [propertyName]="'description'"
     [entity]="entity"
   ></string-editor>
   ...

在另一种情况下,这个(字符串编辑器被文本编辑器取代)

<form>
   <text-editor
     [propertyName]="'code'"
     [entity]="entity"
   ></text-editor>
   ...

等等(根据属性类型设置不同的数字/日期/引用编辑器,为某些用户跳过一些属性……)例如,这是一个例子,实际的配置可以生成更多不同和复杂的模板。

模板正在改变,所以我不能使用ComponentFactoryResolver和传递现有的…我需要一个解决方案与编译器。


当前回答

在Ophir Stern的答案基础上,这里有一个与Angular 4中的AoT一起工作的变体。唯一的问题是我不能向DynamicComponent注入任何服务,但我可以接受。

注意:我还没有测试Angular 5。

import { Component, OnInit, Input, NgModule, NgModuleFactory, Compiler, EventEmitter, Output } from '@angular/core';
import { JitCompilerFactory } from '@angular/compiler';

export function createJitCompiler() {
  return new JitCompilerFactory([{
    useDebug: false,
    useJit: true
  }]).createCompiler();
}

type Bindings = {
  [key: string]: any;
};

@Component({
  selector: 'app-compile',
  template: `
    <div *ngIf="dynamicComponent && dynamicModule">
      <ng-container *ngComponentOutlet="dynamicComponent; ngModuleFactory: dynamicModule;">
      </ng-container>
    </div>
  `,
  styleUrls: ['./compile.component.scss'],
  providers: [{provide: Compiler, useFactory: createJitCompiler}]
})
export class CompileComponent implements OnInit {

  public dynamicComponent: any;
  public dynamicModule: NgModuleFactory<any>;

  @Input()
  public bindings: Bindings = {};
  @Input()
  public template: string = '';

  constructor(private compiler: Compiler) { }

  public ngOnInit() {

    try {
      this.loadDynamicContent();
    } catch (err) {
      console.log('Error during template parsing: ', err);
    }

  }

  private loadDynamicContent(): void {

    this.dynamicComponent = this.createNewComponent(this.template, this.bindings);
    this.dynamicModule = this.compiler.compileModuleSync(this.createComponentModule(this.dynamicComponent));

  }

  private createComponentModule(componentType: any): any {

    const runtimeComponentModule = NgModule({
      imports: [],
      declarations: [
        componentType
      ],
      entryComponents: [componentType]
    })(class RuntimeComponentModule { });

    return runtimeComponentModule;

  }

  private createNewComponent(template: string, bindings: Bindings): any {

    const dynamicComponent = Component({
      selector: 'app-dynamic-component',
      template: template
    })(class DynamicComponent implements OnInit {

      public bindings: Bindings;

      constructor() { }

      public ngOnInit() {
        this.bindings = bindings;
      }

    });

    return dynamicComponent;

  }

}

希望这能有所帮助。

干杯!

其他回答

我一定是迟到了,这里没有一个解决方案对我有帮助——太乱了,感觉像是一个太多的变通办法。

我最终使用了Angular 4.0.0-beta。6 ngComponentOutlet。

这给了我最短、最简单的解决方案,所有这些都写在动态组件的文件中。

下面是一个简单的例子,它只是接收文本并将其放在模板中,但显然你可以根据自己的需要进行更改:

import {
  Component, OnInit, Input, NgModule, NgModuleFactory, Compiler
} from '@angular/core';

@Component({
  selector: 'my-component',
  template: `<ng-container *ngComponentOutlet="dynamicComponent;
                            ngModuleFactory: dynamicModule;"></ng-container>`,
  styleUrls: ['my.component.css']
})
export class MyComponent implements OnInit {
  dynamicComponent;
  dynamicModule: NgModuleFactory<any>;

  @Input()
  text: string;

  constructor(private compiler: Compiler) {
  }

  ngOnInit() {
    this.dynamicComponent = this.createNewComponent(this.text);
    this.dynamicModule = this.compiler.compileModuleSync(this.createComponentModule(this.dynamicComponent));
  }

  protected createComponentModule (componentType: any) {
    @NgModule({
      imports: [],
      declarations: [
        componentType
      ],
      entryComponents: [componentType]
    })
    class RuntimeComponentModule
    {
    }
    // a module for just this Type
    return RuntimeComponentModule;
  }

  protected createNewComponent (text:string) {
    let template = `dynamically created template with text: ${text}`;

    @Component({
      selector: 'dynamic-component',
      template: template
    })
    class DynamicComponent implements OnInit{
       text: any;

       ngOnInit() {
       this.text = text;
       }
    }
    return DynamicComponent;
  }
}

简短说明: My-component—动态组件在其中呈现的组件 DynamicComponent -要动态构建的组件,它在my-component内部呈现

别忘了把所有的angular库升级到^ angular 4.0.0

希望这对你有所帮助,祝你好运!

更新

同样适用于angular 5。

我决定把我学到的东西都压缩到一个文件里。 与RC5之前相比,这里有很多东西值得考虑。注意,这个源文件包括AppModule和AppComponent。

import {
  Component, Input, ReflectiveInjector, ViewContainerRef, Compiler, NgModule, ModuleWithComponentFactories,
  OnInit, ViewChild
} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';

@Component({
  selector: 'app-dynamic',
  template: '<h4>Dynamic Components</h4><br>'
})
export class DynamicComponentRenderer implements OnInit {

  factory: ModuleWithComponentFactories<DynamicModule>;

  constructor(private vcRef: ViewContainerRef, private compiler: Compiler) { }

  ngOnInit() {
    if (!this.factory) {
      const dynamicComponents = {
        sayName1: {comp: SayNameComponent, inputs: {name: 'Andrew Wiles'}},
        sayAge1: {comp: SayAgeComponent, inputs: {age: 30}},
        sayName2: {comp: SayNameComponent, inputs: {name: 'Richard Taylor'}},
        sayAge2: {comp: SayAgeComponent, inputs: {age: 25}}};
      this.compiler.compileModuleAndAllComponentsAsync(DynamicModule)
        .then((moduleWithComponentFactories: ModuleWithComponentFactories<DynamicModule>) => {
          this.factory = moduleWithComponentFactories;
          Object.keys(dynamicComponents).forEach(k => {
            this.add(dynamicComponents[k]);
          })
        });
    }
  }

  addNewName(value: string) {
    this.add({comp: SayNameComponent, inputs: {name: value}})
  }

  addNewAge(value: number) {
    this.add({comp: SayAgeComponent, inputs: {age: value}})
  }

  add(comp: any) {
    const compFactory = this.factory.componentFactories.find(x => x.componentType === comp.comp);
    // If we don't want to hold a reference to the component type, we can also say: const compFactory = this.factory.componentFactories.find(x => x.selector === 'my-component-selector');
    const injector = ReflectiveInjector.fromResolvedProviders([], this.vcRef.parentInjector);
    const cmpRef = this.vcRef.createComponent(compFactory, this.vcRef.length, injector, []);
    Object.keys(comp.inputs).forEach(i => cmpRef.instance[i] = comp.inputs[i]);
  }
}

@Component({
  selector: 'app-age',
  template: '<div>My age is {{age}}!</div>'
})
class SayAgeComponent {
  @Input() public age: number;
};

@Component({
  selector: 'app-name',
  template: '<div>My name is {{name}}!</div>'
})
class SayNameComponent {
  @Input() public name: string;
};

@NgModule({
  imports: [BrowserModule],
  declarations: [SayAgeComponent, SayNameComponent]
})
class DynamicModule {}

@Component({
  selector: 'app-root',
  template: `
        <h3>{{message}}</h3>
        <app-dynamic #ad></app-dynamic>
        <br>
        <input #name type="text" placeholder="name">
        <button (click)="ad.addNewName(name.value)">Add Name</button>
        <br>
        <input #age type="number" placeholder="age">
        <button (click)="ad.addNewAge(age.value)">Add Age</button>
    `,
})
export class AppComponent {
  message = 'this is app component';
  @ViewChild(DynamicComponentRenderer) dcr;

}

@NgModule({
  imports: [BrowserModule],
  declarations: [AppComponent, DynamicComponentRenderer],
  bootstrap: [AppComponent]
})
export class AppModule {}`

EDIT (26/08/2017): The solution below works well with Angular2 and 4. I've updated it to contain a template variable and click handler and tested it with Angular 4.3. For Angular4, ngComponentOutlet as described in Ophir's answer is a much better solution. But right now it does not support inputs & outputs yet. If [this PR](https://github.com/angular/angular/pull/15362] is accepted, it would be possible through the component instance returned by the create event. ng-dynamic-component may be the best and simplest solution altogether, but I haven't tested that yet.

@Long Field的答案是正确的!下面是另一个(同步)例子:

import {Compiler, Component, NgModule, OnInit, ViewChild,
  ViewContainerRef} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

@Component({
  selector: 'my-app',
  template: `<h1>Dynamic template:</h1>
             <div #container></div>`
})
export class App implements OnInit {
  @ViewChild('container', { read: ViewContainerRef }) container: ViewContainerRef;

  constructor(private compiler: Compiler) {}

  ngOnInit() {
    this.addComponent(
      `<h4 (click)="increaseCounter()">
        Click to increase: {{counter}}
      `enter code here` </h4>`,
      {
        counter: 1,
        increaseCounter: function () {
          this.counter++;
        }
      }
    );
  }

  private addComponent(template: string, properties?: any = {}) {
    @Component({template})
    class TemplateComponent {}

    @NgModule({declarations: [TemplateComponent]})
    class TemplateModule {}

    const mod = this.compiler.compileModuleAndAllComponentsSync(TemplateModule);
    const factory = mod.componentFactories.find((comp) =>
      comp.componentType === TemplateComponent
    );
    const component = this.container.createComponent(factory);
    Object.assign(component.instance, properties);
    // If properties are changed at a later stage, the change detection
    // may need to be triggered manually:
    // component.changeDetectorRef.detectChanges();
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}

请访问http://plnkr.co/edit/fdP9Oc。

2019年6月答案

好消息!看起来@angular/cdk包现在对门户提供了一流的支持!

在撰写本文时,我并没有发现上面的官方文档有什么特别的帮助(特别是在向动态组件发送数据和从动态组件接收事件方面)。总之,你需要:

步骤1)更新AppModule

从@angular/cdk/portal包中导入PortalModule,在entryComponents中注册你的动态组件

@NgModule({
  declarations: [ ..., AppComponent, MyDynamicComponent, ... ]
  imports:      [ ..., PortalModule, ... ],
  entryComponents: [ ..., MyDynamicComponent, ... ]
})
export class AppModule { }

步骤2。选项A:如果你不需要向动态组件传递数据和从动态组件接收事件:

@Component({
  selector: 'my-app',
  template: `
    <button (click)="onClickAddChild()">Click to add child component</button>
    <ng-template [cdkPortalOutlet]="myPortal"></ng-template>
  `
})
export class AppComponent  {
  myPortal: ComponentPortal<any>;
  onClickAddChild() {
    this.myPortal = new ComponentPortal(MyDynamicComponent);
  }
}

@Component({
  selector: 'app-child',
  template: `<p>I am a child.</p>`
})
export class MyDynamicComponent{
}

看看它的实际应用

步骤2。选项B:如果你确实需要向动态组件传递数据并从动态组件接收事件:

// A bit of boilerplate here. Recommend putting this function in a utils 
// file in order to keep your component code a little cleaner.
function createDomPortalHost(elRef: ElementRef, injector: Injector) {
  return new DomPortalHost(
    elRef.nativeElement,
    injector.get(ComponentFactoryResolver),
    injector.get(ApplicationRef),
    injector
  );
}

@Component({
  selector: 'my-app',
  template: `
    <button (click)="onClickAddChild()">Click to add random child component</button>
    <div #portalHost></div>
  `
})
export class AppComponent {

  portalHost: DomPortalHost;
  @ViewChild('portalHost') elRef: ElementRef;

  constructor(readonly injector: Injector) {
  }

  ngOnInit() {
    this.portalHost = createDomPortalHost(this.elRef, this.injector);
  }

  onClickAddChild() {
    const myPortal = new ComponentPortal(MyDynamicComponent);
    const componentRef = this.portalHost.attach(myPortal);
    setTimeout(() => componentRef.instance.myInput 
      = '> This is data passed from AppComponent <', 1000);
    // ... if we had an output called 'myOutput' in a child component, 
    // this is how we would receive events...
    // this.componentRef.instance.myOutput.subscribe(() => ...);
  }
}

@Component({
  selector: 'app-child',
  template: `<p>I am a child. <strong>{{myInput}}</strong></p>`
})
export class MyDynamicComponent {
  @Input() myInput = '';
}

看看它的实际应用

对于这种特殊情况,使用指令动态创建组件将是更好的选择。 例子:

在您想要创建组件的HTML中

<ng-container dynamicComponentDirective [someConfig]="someConfig"></ng-container>

我将以以下方式处理和设计指令。

const components: {[type: string]: Type<YourConfig>} = {
    text : TextEditorComponent,
    numeric: NumericComponent,
    string: StringEditorComponent,
    date: DateComponent,
    ........
    .........
};

@Directive({
    selector: '[dynamicComponentDirective]'
})
export class DynamicComponentDirective implements YourConfig, OnChanges, OnInit {
    @Input() yourConfig: Define your config here //;
    component: ComponentRef<YourConfig>;

    constructor(
        private resolver: ComponentFactoryResolver,
        private container: ViewContainerRef
    ) {}

    ngOnChanges() {
        if (this.component) {
            this.component.instance.config = this.config;
            // config is your config, what evermeta data you want to pass to the component created.
        }
    }

    ngOnInit() {
        if (!components[this.config.type]) {
            const supportedTypes = Object.keys(components).join(', ');
            console.error(`Trying to use an unsupported type ${this.config.type} Supported types: ${supportedTypes}`);
        }

        const component = this.resolver.resolveComponentFactory<yourConfig>(components[this.config.type]);
        this.component = this.container.createComponent(component);
        this.component.instance.config = this.config;
    }
}

所以在你的组件中,文本,字符串,日期,任何你在HTML中传递的ng-container元素的配置都是可用的。

配置yourConfig可以是相同的,并定义您的元数据。

根据您的配置或输入类型,该指令应相应执行,并从受支持的类型中呈现适当的组件。如果不是,它将记录一个错误。