相当于 Angular 2 中的$compile



我想手动编译一些包含指令的 HTML。 Angular 2 中的$compile相当于什么?

例如,在 Angular 1 中,我可以动态编译 HTML 片段并将其附加到 DOM 中:

var e = angular.element('<div directive></div>');
element.append(e);
$compile(e)($scope);

Angular 2.3.0 (2016-12-07(

要获取所有详细信息,请检查:

  • 如何使用/创建动态模板来编译带有 Angular 2.0 的动态组件?

要看到它的实际效果:

  • 观察工作中的 plunker(使用 2.3.0+(

校长:

1( 创建模板
2( 创建组件
3( 创建模块
4( 编译模块
5( 创建(和缓存(组件工厂
6( 使用目标创建它的实例

如何创建组件的快速概述

createNewComponent (tmpl:string) {
  @Component({
      selector: 'dynamic-component',
      template: tmpl,
  })
  class CustomDynamicComponent  implements IHaveDynamicData {
      @Input()  public entity: any;
  };
  // a component for this particular template
  return CustomDynamicComponent;
}

一种如何将组件注入 NgModule 的方法

createComponentModule (componentType: any) {
  @NgModule({
    imports: [
      PartsModule, // there are 'text-editor', 'string-editor'...
    ],
    declarations: [
      componentType
    ],
  })
  class RuntimeComponentModule
  {
  }
  // a module for just this Type
  return RuntimeComponentModule;
}

如何创建ComponentFactory(并缓存它(的代码片段

public createComponentFactory(template: string)
    : Promise<ComponentFactory<IHaveDynamicData>> {    
    let factory = this._cacheOfFactories[template];
    if (factory) {
        console.log("Module and Type are returned from cache")
        return new Promise((resolve) => {
            resolve(factory);
        });
    }
    // unknown template ... let's create a Type for it
    let type   = this.createNewComponent(template);
    let module = this.createComponentModule(type);
    return new Promise((resolve) => {
        this.compiler
            .compileModuleAndAllComponentsAsync(module)
            .then((moduleWithFactories) =>
            {
                factory = _.find(moduleWithFactories.componentFactories
                                , { componentType: type });
                this._cacheOfFactories[template] = factory;
                resolve(factory);
            });
    });
}

如何使用上述结果的代码片段

  // here we get Factory (just compiled or from cache)
  this.typeBuilder
      .createComponentFactory(template)
      .then((factory: ComponentFactory<IHaveDynamicData>) =>
    {
        // Target will instantiate and inject component (we'll keep reference to it)
        this.componentRef = this
            .dynamicComponentTarget
            .createComponent(factory);
        // let's inject @Inputs to component instance
        let component = this.componentRef.instance;
        component.entity = this.entity;
        //...
    });

此处阅读包含所有详细信息的完整描述,或观察工作示例

.

.

已过时 - 与 Angular 2.0 RC5 相关(仅限 RC5(

要查看以前RC版本的先前解决方案,请搜索本文的历史记录

注意:正如@BennyBottema在评论中提到的,DynamicComponentLoader 现在已被弃用,因此这个答案也是如此。


Angular2 没有任何$compile等价物。您可以使用 ES6 类的 DynamicComoponentLoader 和 hack 来动态编译代码(请参阅此 plunk(:

import {Component, DynamicComponentLoader, ElementRef, OnInit} from 'angular2/core'
function compileToComponent(template, directives) {
  @Component({ 
    selector: 'fake', 
    template , directives
  })
  class FakeComponent {};
  return FakeComponent;
}
@Component({
  selector: 'hello',
  template: '<h1>Hello, Angular!</h1>'
})
class Hello {}
@Component({
  selector: 'my-app',
  template: '<div #container></div>',
})
export class App implements OnInit {
  constructor(
    private loader: DynamicComponentLoader, 
    private elementRef: ElementRef,
  ) {}
  ngOnInit() {} {
    const someDynamicHtml = `<hello></hello><h2>${Date.now()}</h2>`;
    this.loader.loadIntoLocation(
      compileToComponent(someDynamicHtml, [Hello])
      this.elementRef,
      'container'
    );
  }
}

但它只有在 html 解析器位于 angular2 核心内时才有效。

我用过的 Angular 版本 - Angular 4.2.0

Angular 4 提供了 ComponentFactoryResolver 来在运行时加载组件。这是 Angular 1.0 中 $compile 的一种相同实现,可以满足您的需求

在下面的示例中,我将 ImageWidget 组件动态加载到 DashboardTileComponent

为了加载组件,您需要一个可以应用于ng-template的指令,这将有助于放置动态组件

WidgetHostDirective

 import { Directive, ViewContainerRef } from '@angular/core';
    @Directive({
      selector: '[widget-host]',
    })
    export class DashboardTileWidgetHostDirective {
      constructor(public viewContainerRef: ViewContainerRef) { 

      }
    }

此指令注入 ViewContainerRef 以获取对将承载动态添加的组件的元素的视图容器的访问权限。

仪表板磁贴组件(用于呈现动态组件的占位符组件(

此组件接受来自父组件的输入,或者您可以根据实现从服务加载。此组件在运行时解析组件方面发挥着重要作用。在此方法中,您还可以看到一个名为 renderComponent(( 的方法,该方法最终从服务加载组件名称并使用 ComponentFactoryResolver 进行解析,最后将数据设置为动态组件。

import { Component, Input, OnInit, AfterViewInit, ViewChild, ComponentFactoryResolver, OnDestroy } from '@angular/core';
import { DashboardTileWidgetHostDirective } from './DashbardWidgetHost.Directive';
import { TileModel } from './Tile.Model';
import { WidgetComponentService } from "./WidgetComponent.Service";

@Component({
    selector: 'dashboard-tile',
    templateUrl: 'app/tile/DashboardTile.Template.html'
})
export class DashboardTileComponent implements OnInit {
    @Input() tile: any;
    @ViewChild(DashboardTileWidgetHostDirective) widgetHost: DashboardTileWidgetHostDirective;
    constructor(private _componentFactoryResolver: ComponentFactoryResolver,private widgetComponentService:WidgetComponentService) {
    }
    ngOnInit() {
    }
    ngAfterViewInit() {
        this.renderComponents();
    }
    renderComponents() {
        let component=this.widgetComponentService.getComponent(this.tile.componentName);
        let componentFactory = this._componentFactoryResolver.resolveComponentFactory(component);
        let viewContainerRef = this.widgetHost.viewContainerRef;
        let componentRef = viewContainerRef.createComponent(componentFactory);
        (<TileModel>componentRef.instance).data = this.tile;
    }
}

仪表板磁贴组件.html

 <div class="col-md-2 col-lg-2 col-sm-2 col-default-margin col-default">        
                        <ng-template widget-host></ng-template>
          </div>

小部件组件服务

这是一个服务工厂,用于注册要动态解析的所有组件

import { Injectable }           from '@angular/core';
import { ImageTextWidgetComponent } from "../templates/ImageTextWidget.Component";
@Injectable()
export class WidgetComponentService {
  getComponent(componentName:string) {
          if(componentName==="ImageTextWidgetComponent"){
              return ImageTextWidgetComponent
          }
  }
}

ImageTextWidgetComponent(我们在运行时加载的组件(

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

@Component({
    selector: 'dashboard-imagetextwidget',
    templateUrl: 'app/templates/ImageTextWidget.html'
})
export class ImageTextWidgetComponent implements OnInit {
     @Input() data: any;
    constructor() { }
    ngOnInit() { }
}

最后添加 将此图像文本小部件组件作为入口组件添加到您的应用程序模块中

@NgModule({
    imports: [BrowserModule],
    providers: [WidgetComponentService],
    declarations: [
        MainApplicationComponent,
        DashboardHostComponent,
        DashboardGroupComponent,
        DashboardTileComponent,
        DashboardTileWidgetHostDirective,
        ImageTextWidgetComponent
        ],
    exports: [],
    entryComponents: [ImageTextWidgetComponent],
    bootstrap: [MainApplicationComponent]
})
export class DashboardModule {
    constructor() {
    }
}

磁贴模型

 export interface TileModel {
      data: any;
    }

来自我博客的原始参考

官方文档

下载示例源代码

这个 npm 包让我更容易:https://www.npmjs.com/package/ngx-dynamic-template

用法:

<ng-template dynamic-template
             [template]="'some value:{{param1}}, and some component <lazy-component></lazy-component>'"
             [context]="{param1:'value1'}"
             [extraModules]="[someDynamicModule]"></ng-template>

为了动态地创建组件的实例并将其附加到您的 DOM,您可以使用以下脚本,并且应该在 Angular RC 中工作:

网页模板:

<div>
  <div id="container"></div>
  <button (click)="viewMeteo()">Meteo</button>
  <button (click)="viewStats()">Stats</button>
</div>

加载器组件

import { Component, DynamicComponentLoader, ElementRef, Injector } from '@angular/core';
import { WidgetMeteoComponent } from './widget-meteo';
import { WidgetStatComponent } from './widget-stat';
@Component({
  moduleId: module.id,
  selector: 'widget-loader',
  templateUrl: 'widget-loader.html',
})
export class WidgetLoaderComponent  {
  constructor( elementRef: ElementRef,
               public dcl:DynamicComponentLoader,
               public injector: Injector) { }
  viewMeteo() {
    this.dcl.loadAsRoot(WidgetMeteoComponent, '#container', this.injector);
  }
  viewStats() {
    this.dcl.loadAsRoot(WidgetStatComponent, '#container', this.injector);
  }
}
Angular

TypeScript/ES6 (Angular 2+(

同时与 AOT + JIT 一起工作。

我在这里创建了如何使用它:https://github.com/patrikx3/angular-compile

npm install p3x-angular-compile

组件:应该有一个上下文和一些 html 数据...

目录:

<div [p3x-compile]="data" [p3x-compile-context]="ctx">loading ...</div>

您可以看到该组件,该组件允许编译简单的动态Angular组件 https://www.npmjs.com/package/@codehint-ng/html-compiler

我知道

这个问题很旧,但我花了数周时间试图弄清楚如何在启用 AOT 的情况下使其工作。 我能够编译一个对象,但永远无法执行现有组件。 好吧,我最终决定改变策略,因为我不想编译代码,而是执行自定义模板。 我的想法是添加任何人都可以做的html,并在现有工厂中循环。 这样,我可以搜索元素/属性/等名称并在该HTML上执行组件。 我能够让它工作,并认为我应该分享这个,以节省其他人浪费在它上面的大量时间。

@Component({
    selector: "compile",
    template: "",
    inputs: ["html"]
})
export class CompileHtmlComponent implements OnDestroy {
    constructor(
        private content: ViewContainerRef,
        private injector: Injector,
        private ngModRef: NgModuleRef<any>
    ) { }
    ngOnDestroy() {
        this.DestroyComponents();
    }
    private _ComponentRefCollection: any[] = null;
    private _Html: string;
    get Html(): string {
        return this._Html;
    }
    @Input("html") set Html(val: string) {
        // recompile when the html value is set
        this._Html = (val || "") + "";
        this.TemplateHTMLCompile(this._Html);
    }
    private DestroyComponents() { // we need to remove the components we compiled
        if (this._ComponentRefCollection) {
            this._ComponentRefCollection.forEach((c) => {
                c.destroy();
            });
        }
        this._ComponentRefCollection = new Array();
    }
    private TemplateHTMLCompile(html) {
        this.DestroyComponents();
        this.content.element.nativeElement.innerHTML = html;
        var ref = this.content.element.nativeElement;
        var factories = (this.ngModRef.componentFactoryResolver as any)._factories;
        // here we loop though the factories, find the element based on the selector
        factories.forEach((comp: ComponentFactory<unknown>) => {
            var list = ref.querySelectorAll(comp.selector);
            list.forEach((item) => {
                var parent = item.parentNode;
                var next = item.nextSibling;
                var ngContentNodes: any[][] = new Array(); // this is for the viewchild/viewchildren of this object
                comp.ngContentSelectors.forEach((sel) => {
                    var ngContentList: any[] = new Array();
                    if (sel == "*") // all children;
                    {
                        item.childNodes.forEach((c) => {
                            ngContentList.push(c);
                        });
                    }
                    else {
                        var selList = item.querySelectorAll(sel);
                        selList.forEach((l) => {
                            ngContentList.push(l);
                        });
                    }
                    ngContentNodes.push(ngContentList);
                });
                // here is where we compile the factory based on the node we have
                let component = comp.create(this.injector, ngContentNodes, item, this.ngModRef);
                this._ComponentRefCollection.push(component); // save for our destroy call
                // we need to move the newly compiled element, as it was appended to this components html
                if (next) parent.insertBefore(component.location.nativeElement, next);
                else parent.appendChild(component.location.nativeElement);
                component.hostView.detectChanges(); // tell the component to detectchanges
            });
        });
    }
}

如果要注入 html 代码,请使用指令

<div [innerHtml]="htmlVar"></div>

如果要在某个位置加载整个组件,请使用 DynamicComponentLoader:

https://angular.io/docs/ts/latest/api/core/DynamicComponentLoader-class.html

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