Question

我想创建并执行多个动态组件。我想执行列表中存在的所有组件。如果列表中有3个组件可用，则只有一个组件正在执行，该组件出现在最后一个索引上。

我在right.panel.ts文件中检查此组件是否存在于列表中。如果存在，则我调用特定组件。

但是，问题是只有FreeMemoryComponent从right.panel.ts调用，如果列表中有其他组件aslo。这里，不要调用HeapMemoryComponent，DiskSpaceCOmponent，CpuUsageComponent。

App.module.ts

import.....

@NgModule({
declarations: [
 AppComponent,
 HeapMemoryComponent,
 DiskSpaceComponent,
 CpuUsageComponent,
 FreeMemoryComponent,
 BottomPanelDynamicComponent
],
imports: [
 BrowserModule,
 FormsModule,
 HttpModule,
 MaterialModule.forRoot(),
 DndModule.forRoot(),
 routing
],
providers: [.....],
bootstrap: [AppComponent],
entryComponents:[...],
exports: [...]
})
export class AppModule { }

我正在调用以下文件中的组件。

right.panel.ts

import { Component, OnInit } from '@angular/core';
import {HeapMemoryComponent} from '../heap-memory-graph/heap-memory-graph.component';
import {DiskSpaceComponent} from '../disk-space-graph/disk-space-graph.component';
import {CpuUsageComponent} from '../cpu-usage-graph/cpu-usage-graph.component';
import {FreeMemoryComponent} from '../free-memory-graph/free-memory-graph.component';

@Component({
  selector: 'app-rightpanel',
  templateUrl: './rightpanel.component.html',
  styleUrls: ['./rightpanel.component.css']
})
export class RightpanelComponent implements OnInit {
componentData2 = null;
constructor(private savedWidgetService:GetSavedWidgetService) {}

ngOnInit() {
    this.service.getSavedWidget().subscribe(lst => {
      for (var v in lst) {
        if (lst[v].name == "Heap Memory") {
          this.componentData2 = {
            component: HeapMemoryComponent,
            inputs: {
              showNum: 0
            }
          };
        } else if (lst[v].name == "Disk Space") {
          this.componentData2 = {
            component: DiskSpaceComponent,
            inputs: {
              showNum: 0
            }
          };
        } else if (lst[v].name == "CPU Usage") {
          this.componentData2 = {
            component: CpuUsageComponent,
            inputs: {
              showNum: 0
            }
          };
        } else if (lst[v].name == "Free Memory") {
          this.componentData2 = {
            component: FreeMemoryComponent,
            inputs: {
              showNum: 0
            }
          };

        } 
      }
    }
    }
    }

right.panel.html

<app-bottompanel [componentData2]="componentData2" class="row"></app-bottompanel>

在以下文件中，我动态创建和执行组件。

import {Component, Input, ViewContainerRef, ViewChild, ReflectiveInjector, ComponentFactoryResolver} from '@angular/core';
import {HeapMemoryComponent} from '../heap-memory-graph/heap-memory.component';
import {DiskSpaceComponent} from '../disk-space-graph/disk-space.component';
import {CpuUsageComponent} from '../cpu-usage-graph/cpu-usage.component';
import {FreeMemoryComponent} from '../free-memory-graph/free-memory.component';

@Component({
  selector: 'app-bottompanel',
  entryComponents[HeapMemoryComponent,DiskSpaceComponent,CpuUsageComponent,FreeMemoryComponent],
  template: `<div #dynamicComponentContainer></div>`,
})
export default class BottomPanelDynamicComponent {
  currentComponent2 = null;

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

  // component: Class for the component you want to create
  // inputs: An object with key/value pairs mapped to input name/input value
@Input() set componentData2(data: {component: any, inputs: any }) {
if (!data) {
  return;
}

// Inputs need to be in the following format to be resolved properly
let inputProviders = Object.keys(data.inputs).map((inputName) => {return {provide: inputName, useValue: data.inputs[inputName]};});
let resolvedInputs = ReflectiveInjector.resolve(inputProviders);

// We create an injector out of the data we want to pass down and this components injector
let injector = ReflectiveInjector.fromResolvedProviders(resolvedInputs, this.dynamicComponentContainer.parentInjector);

// We create a factory out of the component we want to create
let factory = this.resolver.resolveComponentFactory(data.component);

// We create the component using the factory and the injector
let component = factory.create(injector);

// We insert the component into the dom container
this.dynamicComponentContainer.insert(component.hostView);

// We can destroy the old component is we like by calling destroy
if (this.currentComponent2) {
  //this.currentComponent.destroy();
}

this.currentComponent2 = component;
}

constructor(private resolver: ComponentFactoryResolver) {

}
}

这里发生了什么？请帮帮我。

Answer 1

更改

componentData2 = null;

到

componentData2 = [];

和

      this.componentData2 = {
        component: HeapMemoryComponent,
        inputs: {
          showNum: 0
        }
      };

到

      this.componentData2.push({
        component: HeapMemoryComponent,
        inputs: {
          showNum: 0
        }
      });

和

<app-bottompanel [componentData2]="componentData2" class="row"></app-bottompanel>

到

<app-bottompanel *ngFor="let cd2 of componentData2" [componentData2]="cd2" class="row"></app-bottompanel>

Angular 2动态组件未执行

1 个答案: