Angular 来自 HTTP 调用的动态模板

Question

我有一个简单的问题：在一个简单的 Angular 组件中，我们能否动态更改由 http 调用检索到的模板，例如：

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';


/**
 * Les liens link permettent de passer d'une page à l'autre.
 */
@Component({
  selector: 'mycomponent',
  template: '<strong>Loading…</strong>'
})
export class MyComponent implements OnInit {

  //#region PROPRIÉTÉS
    private moHttp : HttpClient
  //#endregion

  //#region CONSTRUCTEUR
  constructor(poHttp: HttpClient){
    this.moHttp = poHttp;
  }

  public ngOnInit(): void {
    this.moHttp.get('https://myapiUrl').subscribe(poData:any => {

      // here poData is HTML string, and I want to set it instead of the "<strong>Loading…</strong>"

    });
  }

  }
  //#endregion

提前致谢

Answer 1

假设您的 poData 是一个字符串，您可以执行以下操作，

@Component({
  selector: 'mycomponent',
  template: '<div [innerHTML]="myContent"></div>'
})
export class MyComponent implements OnInit {
   private moHttp : HttpClient;
   myContent: any= '<strong>Loading…</strong>';

   constructor(poHttp: HttpClient, private sanitizer: DomSanitizer){
      this.moHttp = poHttp;
   }

   public ngOnInit(): void {
      this.moHttp.get('https://myapiUrl').subscribe(poData:any => {

      this.myContent = this.sanitizer..bypassSecurityTrustHtml(poData);

   });
 }
}

Answer 2

尝试使用

注意：您不必创建新字段来保留注入的服务。
constructor(private http: HttpClient){} 将允许您在 class.

中的任何位置使用 httpClient（如 this.http）

Answer 3

Angular 本身不支持动态模板。您可以使用延迟加载或直接通过 DOM.

更新视图

...或者有一个非常 hacky hack 来实现它，感谢 DenisVuyka：Full Article

这里我们需要创建NgModule来创建组件工厂，并使用Component装饰器将模板和提供者等元数据传递给组件class。

@Component({
    selector: 'runtime-content',
    template: `<div #container></div>`
})    
export class RuntimeContentComponent {
    constructor(public componentRef: ComponentRef, private compiler: Compiler){}

    @ViewChild('container', { read: ViewContainerRef })
    container: ViewContainerRef;

    public compileTemplate(template) {
        let metadata = {
           selector: `runtime-component-sample`,
           template: template
        };

        let factory = this.createComponentFactorySync(this.compiler, metadata, null);

        if (this.componentRef) {
            this.componentRef.destroy();
            this.componentRef = null;
        }
        this.componentRef = this.container.createComponent(factory);
    }

    private createComponentFactorySync(compiler: Compiler, metadata: Component, componentClass: any): ComponentFactory<any> {
        const cmpClass = componentClass || class RuntimeComponent { name: string = 'Denys' };
        const decoratedCmp = Component(metadata)(cmpClass);

        @NgModule({ imports: [CommonModule], declarations: [decoratedCmp] })
        class RuntimeComponentModule { }

        let module: ModuleWithComponentFactories<any> = compiler.compileModuleAndAllComponentsSync(RuntimeComponentModule);
        return module.componentFactories.find(f => f.componentType === decoratedCmp);
    }
}

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