使用服务动态加载NgModule entryComponents

Question

嗨,我是angular2和打字稿的新手.我正在动态加载组件,我想知道是否有办法在模块的"声明"和"entryComponents"中使用服务声明我的组件.

使用typescript,我可以通过执行以下操作来实现它:

import { ComponentLoaderService } from './../../services/component-loader.service';

let componentsToLoad = ComponentLoaderService.getComponents();

@NgModule({
  declarations: [ componentsToLoad ],
  entryComponents: [ componentsToLoad ],
})
export class testModule {}

这实际上有效,但只有在我编译并且服务器首先运行时.

如果,我尝试重新编译并运行它,我得到这个常量错误:

"静态解析符号值时遇到错误.不支持函数调用.请考虑使用对导出函数的引用替换函数或lambda,"

我的另一个想法是,有没有办法将组件加载到"export class testModule {}"部分来填充数组然后将其传递给NgModule？

从我目前的测试来看它不起作用,但我还是新手,所以我可能会遗漏一些东西.

希望有人能提供帮助.谢谢!

以下是创建编译错误的代码:

我刚刚做了一个新的测试应用程序.

然后在test-app文件夹中我做了npm install.

我创建了/src/app/services/components-loader.service.ts.

import { Injectable } from '@angular/core';
import { ViewContainerRef, ViewChild, ComponentFactoryResolver } from '@angular/core';

@Injectable()
export class ComponentLoaderService {
    constructor(private componentFactoryResolver: ComponentFactoryResolver){}

    static getComponents(components: any[]): any[] {
        var tmp = Array();

        for (var i = 0; i < components.length; ++i){
            if (components[i].key == 0){
                tmp.push(components[i].component);
            }
        }

        return tmp;
    }

    load(container: ViewContainerRef, components: any[]): void {
        // clear 
        container.clear();

        for (var i = 0; i < components.length; ++i){
            if (components[i].key == 0 || components[i].key == 'site'){
                const childComponent = this.componentFactoryResolver.resolveComponentFactory( components[i].component );

                // at this point we want the "child" component to be rendered into the app.component:
                container.createComponent(childComponent);          
            }            
        }
    }
}

我创建了一个文件/src/app/components.ts.

import { TestComponent } from './test.component';

export const mainComponents = [
    { key: 0, component: TestComponent },        
];

我创建了一个文件/src/app/test.component.ts.

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

@Component({
  template: `test`,
})
export class TestComponent {}

我修改了/src/app/app.module.ts看起来像这样.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';

import { AppComponent } from './app.component';
import { mainComponents } from './components';
import { ComponentLoaderService } from './services/components-loader.service';

let componentsToLoad = ComponentLoaderService.getComponents(mainComponents);

@NgModule({
  declarations: [
    AppComponent,
    componentsToLoad
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule
  ],
  providers: [],
  bootstrap: [AppComponent],
  entryComponents: [ componentsToLoad ],
})
export class AppModule { }

当我使用ng serve编译时,我收到此错误:

10%构建模块2/2模块0 activeError:在静态解析符号值时遇到错误.不支持函数调用.考虑使用对导出函数的引用替换函数或lambda,解决D:/ angularjs/test-app/src/app/app.module.ts中的符号AppModule,解决D:/ angularjs/test-app /中的符号AppModule SRC /应用程序/ app.module.ts

Answer 1

@NgModule({
    declarations: [],
    exports: []
})
export class testModule {
    static withComponents(components: any[]) {
        return {
            ngModule: testModule,
            providers: [
                {provide: ANALYZE_FOR_ENTRY_COMPONENTS, useValue: components, multi: true}
            ]
        }
    }
}

其他模块:

import { ComponentLoaderService } from './../../services/component-loader.service';

let componentsToLoad = ComponentLoaderService.getComponents();

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        testModule.withComponents([
            ...componentsToLoad
        ])
    ],
    declarations: [
        AppComponent,
        ...componentsToLoad
    ],
    bootstrap: [AppComponent]
})
export class AppModule {
}

通过在此处使用ANALYZE_FOR_ENTRY_COMPONENTS,您可以动态地将多个组件添加到NgModule.entryComponents条目.