同一页上的Bootstrap Angular App多次

时间:2017-10-30 16:38:47

标签: angular

我想在同一页面上多次引导一个Angular 4微应用程序。基本上,foreach类的实例'.angular-micro-app',引导新的app实例。

据我所知,传统上这些是单个父App中的Angular组件。在我的情况下,这是不可能的,我需要在同一页面上的同一根级别应用程序(组件)的多个实例。对于AngularJS 1.x来说,这是相当微不足道的,但是对于Angular而言却相当令人沮丧。

示例:

index.html代码段

import { Component } from '@angular/core';

@Component({
  selector: '.angular-micro-app',
  template: require('./app.component.html'),
})
export class AppComponent { }

app.component.ts:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
  ],
  providers: [

  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

app.module.ts:

platformBrowserDynamic().bootstrapModule(AppModule);

在主文件中,我正在做基本的平台引导程序:

set decodedFilePath to base64decode(filePath)

on base64decode(str)
    return do shell script "openssl enc -base64 -d <<END_OF_TEXT" & str & "END_OF_TEXT"
end base64decode

1 个答案:

答案 0 :(得分:0)

这可以通过在NgModule ngDoBootstrap方法中手动引导根级别组件来完成。

(请注意,在Angular 5+中可能不再需要此方法,请参阅this Angular PR

我们首先找到我们想要引导的所有根元素,并为它们提供唯一的ID。然后,对于每个实例,使用新ID攻击组件工厂选择器并触发引导程序。

const entryComponents = [
  RootComponent,
];

@NgModule({
  entryComponents,
  imports: [
    BrowserModule,
  ],
  declarations: [
    RootComponent,
  ],
})
export class MyModule {
  constructor(private resolver: ComponentFactoryResolver) {}

  ngDoBootstrap(appRef: ApplicationRef) {
    entryComponents.forEach((component: any) => {
      const factory = this.resolver.resolveComponentFactory(component);
      let selectorName;
      let elements;

      // if selector is a class
      if (factory.selector.startsWith('.')) {
        selectorName = factory.selector.replace(/^\./, '');
        elements = document.getElementsByClassName(selectorName);

      // else assume selector is an element
      } else {
        selectorName = factory.selector;
        elements = document.getElementsByTagName(selectorName);
      }

      // no elements found, early return
      if (elements.length === 0) {
        return;
      }

      // more than one root level componenet found, bootstrap unique instances
      if (elements.length > 1) {
        const originalSelector = factory.selector;

        for (let i = 0; i < elements.length; i += 1) {
          elements[i].id = selectorName + '_' + i;
          (<any>factory).factory.selector = '#' + elements[i].id;
          appRef.bootstrap(factory);
        }

        (<any>factory).factory.selector = originalSelector;

      // only a single root level component found, bootstrap as usual
      } else {
        appRef.bootstrap(factory);
      }
    });
  }
}

现在,假设我们的RootComponent的选择器是&#39; .angular-micro-app&#39;这将按预期工作:

<body>
    <div class="angular-micro-app"></div>
    ...
    <div class="angular-micro-app"></div>
</body>