[英]Angular 2 dynamically create components in ngFor
我的控制器有一個我想要在頁面中的組件列表。 這些其他組件是獨立創建和正常工作的。
在我的HTML模板中:
<ng-container *ngFor="let component of components">
<div {{component.name}}></div>
</ng-container>
代碼應該像這樣輸出一個<div>
:
<div my-component></div>
但它不是,我收到這個錯誤:
DOMException: Failed to execute 'setAttribute' on 'Element'
如果我只是在div標簽內打印值,它的效果很好:
<div>{{component.name}}</div>
甚至有可能實現我想要的目標嗎?
您可以創建組件工廠並將您需要的那些組件作為條目組件:
<div #dynamicComponentContainer></div>
import { Component,Input,ViewContainerRef,ViewChild,ReflectiveInjector,ComponentFactoryResolver } from '@angular/core';
import { YourComponent } from './your-component.component';
@Component({
selector: 'component-factory',
templateUrl: './component-factory.component.html',
styleUrls: ['./component-factory.component.css'],
entryComponents: [ YourComponent ]
})
export class ComponentFactoryComponent {
currentComponent = 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 componentData (data: {component: any, inputs: any }) {+ if (!data) {
return;
}
// Give you access to the inputs inside the component
let inputProviders = Object.keys(data.inputs).map((inputName) => {return {provide: inputName, useValue: data.inputs[inputName]};});
let resolvedInputs = ReflectiveInjector.resolve(inputProviders);
// This will prepare the inject of inputs on the factory
let injector = ReflectiveInjector.fromResolvedProviders(resolvedInputs, this.dynamicComponentContainer.parentInjector);
// Creates a factory
let factory = this.resolver.resolveComponentFactory(data.component);
// Here we inject the inputs on the factory
let component = factory.create(injector);
// This will add the component in the DOM container
this.dynamicComponentContainer.insert(component.hostView);
// This destroys the old component and input the new one
if (this.currentComponent) {
this.currentComponent.destroy();+ }
this.currentComponent = component;
}
constructor(private resolver: ComponentFactoryResolver) { }
在您要使用的組件上,您需要提供輸入,我們通過Injector執行此操作:
import { Component, Input, Injector } from '@angular/core';
@Component({
selector: 'your-component, [your-component]',
templateUrl: './your-component.component.html',
styleUrls: ['./your-component.component.css']
})
export class YourComponent {
@Input() name: string;
@Input() label: string;
@Input() value: string;
constructor(private injector: Injector) {
this.name = this.injector.get('name');
this.label = this.injector.get('label');
this.value = this.injector.get('value');
}
}
然后在您的應用程序組件上,或者您想要使用它時:
<component-factory [componentData]="componentData"></component-factory>
import { Component } from '@angular/core';
import {YourComponent} from './your-component.component'
@Component({
selector: 'app',
templateUrl: './app.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
componentData = null;
constructor() { }
ngOnInit() {
this.componentData = {
component: YourComponent,
inputs: {
name: 'example',
label: 'John Doe',
value: 'foo'
}
}
}
}
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